Overview.htm
author Takeshi Yoshino <tyoshino@google.com>
Wed, 29 Jan 2014 18:41:50 +0900
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child 140 93d7056adf94
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<!DOCTYPE html>
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<html>
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<head>
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	<title>Streams API</title>
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	<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
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	<!-- <script class=remove src="http://dev.w3.org/2009/dap/ReSpec.js/js/respec.js"></script> -->
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	<script class="remove" src="https://www.w3.org/Tools/respec/respec-w3c-common"></script>
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	<!-- <script class="remove" src="respec-w3c-common.js"></script> -->
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	<script class="remove">
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var respecConfig = {
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	// specification status (e.g. WD, LCWD, NOTE, etc.). If in doubt use ED.
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	specStatus:           "ED",
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	// the specification's short name, as in http://www.w3.org/TR/short-name/
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	shortName:            "streams-api",
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	// if your specification has a subtitle that goes below the main
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	// formal title, define it here
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	// subtitle   :  "an excellent document",
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	// if you wish the publication date to be other than today, set this
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	// publishDate:  "yyyy-mm-dd",
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	// if the specification's copyright date is a range of years, specify
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	// the start date here:
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	// copyrightStart: "2005"
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	// if there is a previously published draft, uncomment this and set its YYYY-MM-DD date
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	// and its maturity status
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	// previousPublishDate:  "yyyy-mm-dd",
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	// previousMaturity:  "WD",
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	// if there a publicly available Editor's Draft, this is the link
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	edDraftURI:           "http://dvcs.w3.org/hg/streams-api/raw-file/tip/Overview.htm",
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	// if this is a LCWD, uncomment and set the end of its review period
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	// lcEnd: "2009-08-05",
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	// if you want to have extra CSS, append them to this list
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	// it is recommended that the respec.css stylesheet be kept
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	//extraCSS:             ["http://dev.w3.org/2009/dap/ReSpec.js/css/respec.css",
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	//	"http://www.w3.org/StyleSheets/TR/W3C-ED.css",
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	//	],
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	// editors, add as many as you like
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	// only "name" is required
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	localBiblio: {
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		"EncodingDetermination": {
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			title: "Encoding",
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			href: "http://encoding.spec.whatwg.org/",
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			authors: ["Anne van Kesteren", "Joshua Bell"],
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			publisher: "WHATWG"
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		}
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	},
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	editors:  [
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		{ name: "Feras Moussa", url: "mailto:feras.moussa@hotmail.com",
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			company: "Invited Expert",  },
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		{ name: "Takeshi Yoshino", url: "mailto:tyoshino@google.com",
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			company: "Google, Inc.",  },
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	],
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	// authors, add as many as you like.
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	// This is optional, uncomment if you have authors as well as editors.
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	// only "name" is required. Same format as editors.
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	//authors:  [
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	//    { name: "Your Name", url: "http://example.org/",
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	//      company: "Your Company", companyURL: "http://example.com/" },
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	//],
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	// name of the WG
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	wg:           "W3C Web Applications (WebApps)",
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	// URI of the public WG page
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	wgURI:        "http://www.w3.org/2008/webapps/",
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	// name (with the @w3c.org) of the public mailing to which comments are due
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	wgPublicList: "public-webapps",
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	// URI of the patent status for this WG, for Rec-track documents
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	// !!!! IMPORTANT !!!!
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	// This is important for Rec-track documents, do not copy a patent URI from a random
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	// document unless you know what you're doing. If in doubt ask your friendly neighbourhood
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	// Team Contact.
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	wgPatentURI:  "",
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};
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</script>
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	<!-- Styles to mimic File API spec -->
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	<!-- <style type="text/css"> -->
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	<!-- 	table.error { border-collapse:collapse; border-style:hidden hidden none hidden } -->
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	<!-- 	table.error thead { border-bottom:solid } -->
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	<!-- 	table.error tbody th:first-child { border-left:solid } -->
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	<!-- 	table.error td, table th { border-left:solid; border-right:solid; border-bottom:solid thin; vertical-align:top; padding:0.2em } -->
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	<!-- </style> -->
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</head>
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<body>
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	<section id="sotd">
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		<p>
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			This document is not complete.
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			It is subject to major changes and, while early experimentations are encouraged, it is therefore not intended for implementation.
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		</p>
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		<p>
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			To check recent changes and rationale for them, please visit <a href="https://dvcs.w3.org/hg/streams-api/">Mercurial history</a>.
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			Check open bugs at Bugzilla using <a href="https://www.w3.org/Bugs/Public/buglist.cgi?component=Streams%20API">this link</a>.
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			If you wish to submit a bug, please use <a href="https://www.w3.org/Bugs/Public/enter_bug.cgi?product=WebAppsWG&component=Streams%20API">this link</a>.
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			All comments and bug reports are welcome.
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		</p>
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	</section>
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	<section id="abstract">
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		<p>
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			This specification provides an API for representing a stream of data in web applications, as well as programmatically reading and writing it.
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			This includes:
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		</p>
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		<ul>
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			<li>
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				An interface named <a>WritableStream</a> which defines a general protocol for data consuming APIs (<a href="#consumers">consumers</a>) to communicate with data producing code (<a href="#producers">producers</a>).
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			</li>
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			<li>
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				An interface named <a>ReadableStream</a> which defines a general protocol for data producing APIs to communicate with data consuming code.
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			</li>
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			<li>
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				An interface named <a>ByteStream</a> which inherits both WritableStream and ReadableStream and represents a sequence of data.
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			</li>
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			<li>
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				A struct type named <a>StreamReadResult</a> which represents the result of consuming operations such as <code>read()</code> and <code>pipe()</code>.
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				It holds:
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				<ul>
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					<li>Chunk of content read from a <a>ReadableStream</a></li>
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					<li>The total cost of the chunk</li>
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					<li>EOF signal</li>
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					<li>Error info</li>
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				</ul>
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			</li>
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			<li>
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				An enum <a>StreamReadType</a> which represents data types as which data can be read from a <a>ReadableStream</a>.
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			</li>
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			<li>
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				A list of notable data <a href="#producers">producers</a> and <a href="#consumers">consumers</a> for which we can apply either or both of <a>ReadableStream</a> and <a>WritableStream</a> model.
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			</li>
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			<li>
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				Extensions to <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-xmlhttprequest-interface">XMLHttpRequest</a> [[!XMLHTTPREQUEST2]] to add support for uploading data via <a>WritableStream</a> and downloading a response as a <a>ReadableStream</a>.
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			</li>
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			<li>
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				Extensions to <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL">URL.createObjectURL</a> and <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-revokeObjectURL">URL.revokeObjectURL</a> to add support for <a>ReadableStream</a>.
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			</li>
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		</ul>
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		<p>
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			This API is designed to be used in conjunction with other APIs and elements on the web platform, notably:
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			<ul>
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				<li><a href="http://dev.w3.org/2006/webapi/FileAPI">FileAPI</a> [[!FILE-API]]</li>
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				<li>
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					<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2">XMLHttpRequest</a>.
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					E.g. with an overloaded <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-send-method"><code>send()</code></a> method and <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-responsetype-attribute"><code>response</code></a> object for <a>ReadableStream</a> objects) [[!XMLHTTPREQUEST2]].
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				</li>
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				<li><a href="http://dev.w3.org/html5/postmsg/#dom-window-postmessage"><code>postMessage</code></a></li>
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				<li>Web Workers [[!WEBWORKERS]]</li>
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			</ul>
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		</p>
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	</section>
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	<section id="introduction" class="section informative">
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		<h2>Introduction</h2>
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		<p>
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			Web applications should have the ability to acquire, manipulate, and pass data in a wide variety of forms, including as a sequence of data made available over time.
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			This specification defines the basic representation for streams of data, and programmatic ways to read and write streams of data and errors raised on those operations.
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		</p>
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		<p>
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			The <a>WritableStream</a> interface defines a general protocol for <a href="#consumers">data consuming APIs</a> to communicate with data producing code.
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			In these cases, the data consuming API, such as a decoder, provides a <a>WritableStream</a> for other applications to write to, enabling the decoder to begin decoding data as it becomes available.
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			The data is written to the internal data sink inside the data consuming API using:
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			<ul>
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				<li>
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					The <code>write()</code> method which writes the given data to the data sink
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				</li>
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				<li>
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					The <code>awaitSpaceAvailable()</code> method which allows a data producing code to write data to the data consuming API only when its data sink is available to consume more data.
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					This is useful for cases where an app may want to avoid filling the internal buffer.
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				</li>
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			</ul>
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			Actual transfer of data to the data sink may happen either synchronously or asynchronously.
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			<a>WritableStream</a> hides the details of actual communication with the data sink while allowing for an efficient transfer of data.
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		</p>
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		<p>
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			The <a>ReadableStream</a> interface defines a general protocol for <a href="#producers">data producing APIs</a> to communicate with data consuming code.
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			This interface represents the potential for an infinite amount of data which are obtained over time and read once.
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			Data consuming code reads data from the internal data source inside the data producing API using:
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			<ul>
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				<li>
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					The <code>read()</code> and <code>readUpTo()</code> methods which reads data from the data source
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				</li>
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				<li>
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					The <code>pullAmount</code> attribute which paces data retrieval from the data source
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				</li>
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				<li>
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					The <code>pipe()</code> method which transfers data in bulk from the data source into the data sink of another API which implements <a>WritableStream</a>
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				</li>
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			</ul>
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			Actual transfer of data from the data source may happen either synchronously or asynchronously.
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			The <a>ReadableStream</a> hides the details of actual communication with the data source while allowing for an efficient transfer of data.
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		</p>
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		<p>
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			With the combination of the following features, this interface suite responds to various simple and complex needs of data stream handling.
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			<ul>
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				<li>Delayed notification of completion by using <a>Promise</a>s. See below for more details.</li>
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				<li>Explicit back pressure management by propagating room for consumption back to producers</li>
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				<li><a>WritableStream</a> always accepts incoming data synchronously to bridge with legacy APIs that don't understand backpressure</li>
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			</ul>
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		</p>
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		<p>
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			The <a>ByteStream</a> is a simple implementation of both the <a>WritableStream</a> and <a>ReadableStream</a> interface.
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			A ByteStream has a single queue of bytes which works as a data sink for the WritableStream interface and as a data source for the ReadableStream interface.
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		</p>
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		<p>
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			Read and write operations on these interfaces are implemented using <a>Promise</a>.
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			When an operation completes, the Promise returned by a method will be fulfilled, and then the fulfill callback set to the Promise will handle the result.
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			Error conditions that may arise during an operation will be handled by the reject callback set to the Promise.
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		</p>
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		<p>
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			The base stream classes are defined as JavaScript primitives.
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			Extensions to it for use in browsers are defined separately.
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		</p>
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		<p>
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			Examples below will be illustrative.
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		</p>
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		<p>
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			The example below demonstrates how to read a chunk of data from a <a>ReadableStream</a> using <code>read()</code>.
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			The <a>ReadableStream</a> may of come from a <a href="#producers">producer</a> such as <code>XMLHttpRequest</code>.
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		</p>
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		<pre class="example">
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// Tell stream that we're ready to consume 1024 bytes.
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stream.pullAmount = 1024;
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stream.readEncoding = "UTF-8";
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stream.readBinaryAs = "arraybuffer";
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stream.read().then(
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  function (result) {
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    // Process data
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  },
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  function (error) {
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    // Handle error
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  });</pre>
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		<p>
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			The example below demonstrates how to read bytes from a <a>ReadableStream</a> until an EOF is encountered.
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		</p>
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		<pre class="example">// Read data from the ReadableStream repeatedly
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function readUntilEof() {
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  stream.read().then(
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    function (result) {
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      processData(result.data);
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      if (!result.eof) {
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        readUntilEof();
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      }
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    },
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    function (error) {
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      // Handle error
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    });
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}
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readUntilEof();</pre>
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		<p>
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			The example below demonstrates how to obtain a <a>ReadableStream</a> from <a>XMLHttpRequest</a> to begin playing a large video in <code>readystate</code> LOADING.
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			The example takes the <a>ReadableStream</a> from a <a href="#producers">producer</a>, <a>XMLHttpRequest</a>, and gives it to a <a href="#consumers">consumer</a>, the video tag.
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			If the consumer implements the <a>WritableStream</a> interface, we could use <code>pipe()</code> to transfer data to it instead of URL.
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		</p>
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		<pre class="example">function handler() {
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  if(this.readyState == this.LOADING) {
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    var theStream = this.response;
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    var streamURL = URL.createObjectURL(theStream);
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    document.getElementById("myVideoTag").src = streamURL;
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  }
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}
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var client = new XMLHttpRequest();
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client.onreadystatechange = handler;
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client.setRequestHeader('customHeader', 'value');
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client.setRequestHeader('customHeader2', 'value2');
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client.open("GET", "myvideo.h264");
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client.responseType = "stream";
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client.send();</pre>
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		<p>
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			The example below demonstrates how to use <code>write()</code> to load a <a>ReadableStream</a> into the audio tag, whose data could be processed and built dynamically at read time.
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			ByteStream in the example is a class which implements both <a>WritableStream</a> and <a>ReadableStream</a>.
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			It accepts bytes generated by the code via <a>WritableStream</a> methods, and the written data will be consumed by the audio element via the object URL which is a part of <a>ReadableStream</a>'s functionality.
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		</p>
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		<pre class="example">var stream = new ByteStream("audio/mp3");
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function writeData() {
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  // Do work to create more data to place into the stream
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  var data = generateMusic();
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  // If we have no more data to process and place in the stream, we close
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  if (moreData == null){
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    stream.writeClose();
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  } else{
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    // Wait until write() completes.
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    stream.write(data).then(
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      function () {
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        writeData();
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      },
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      function (error) {
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        // Handle error
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      }
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    );
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  }
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}
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var streamURL = URL.createObjectURL(stream);
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document.getElementById('audioTag').src = streamURL;
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writeData();</pre>
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		<p>
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			A producer can also do work only when pulled by using <code>awaitSpaceAvailable()</code>.
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			This method informs the data producing code of that the data consuming API is ready to consume data.
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			This is useful when high-performance is necessary.
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		</p>
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		<pre class="example">function poll() {
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  stream.awaitSpaceAvailable().then(
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    function (pulledAmount) {
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      stream.write(generateRandomBytes(pulledAmount));
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      poll();
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    }
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  );
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}
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poll();</pre>
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		<p>
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			The example below demonstrates how the timing to pull new data is determined.
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			When data of cost X is loaded and passed to the Promise, the <a>ReadableStream</a> marks X bytes of pullAmount as used.
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			The next <code>read()</code> call automatically clears the mask to request the data source to produce X more data.
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			If precise flow control is needed, you update pullAmount before the next <code>read()</code>.
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			In the example, the producer API is requested to produce 16 bytes, and then in the fulfill callback, pullAmount is set to the remaining number of bytes not to let the API produce more data.
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		</p>
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		<pre class="example">stream.pullAmount = 16;
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function read() {
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  stream.read().then(
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    function (result) {
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      process(result);
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      stream.pullAmount -= result.size;
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      if (stream.pullAmount == 0) {
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        // Done
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      } else if (stream.eof) {
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        // Done
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      } else {
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parents: 112
diff changeset
   376
        read();
b6a7ebb05e6b Add pullAmount precise flow control example
Takeshi Yoshino <tyoshino@google.com>
parents: 112
diff changeset
   377
      }
b6a7ebb05e6b Add pullAmount precise flow control example
Takeshi Yoshino <tyoshino@google.com>
parents: 112
diff changeset
   378
    }
b6a7ebb05e6b Add pullAmount precise flow control example
Takeshi Yoshino <tyoshino@google.com>
parents: 112
diff changeset
   379
  );
b6a7ebb05e6b Add pullAmount precise flow control example
Takeshi Yoshino <tyoshino@google.com>
parents: 112
diff changeset
   380
}</pre>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
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parents: 46
diff changeset
   381
	</section>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   382
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   383
	<section class="section" id="writableByteStream">
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   384
		<h2>WritableStream Interface</h2>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
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parents: 46
diff changeset
   385
		<p>
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   386
			The WritableStream interface defines a protocol for APIs which consume a data stream.
87
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
   387
			The protocol includes:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
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parents: 46
diff changeset
   388
			<ol>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   389
				<li>How to receive data stream</li>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   390
				<li>How to notify the writer (data producing code) of completion of writing</li>
77
3e2335dbad62 Rewording
Takeshi Yoshino <tyoshino@google.com>
parents: 76
diff changeset
   391
				<li>How to notify the writer of how much data can be accepted currently</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   392
			</ol>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   393
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   394
			By returning a <a>Promise</a> and delaying fulfillment of it, the WritableStream realizes flow control.
76
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fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   395
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   396
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   397
		<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   398
			The actual data consumer behind the WritableStream is called a data sink and is identified by <dfn>dataSink</dfn>.
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   399
			A data sink consumes stream of data and notifies the WritableStream of the cost of data the data sink can newly accept.
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   400
			For each data sink, it must be defined how to calculate <a>cost</a> of each object which the data sink can consume.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   401
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   402
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   403
		<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   404
			A WritableStream has a one-to-one mapping with the associated data sink, and has defined semantics for <a href='#interactingWithDataSink'>interacting with the data sink internally</a>.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   405
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   406
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   407
		<section class="section">
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   408
			<h3>WritableStream interface</h3>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   409
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   410
			<dl class="idl" title="interface WritableStream">
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   411
				<dt>attribute DOMString writeEncoding</dt>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   412
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   413
					<p>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   414
						A <a>DOMString</a> that represents the label of an encoding [[!EncodingDetermination]] to be passed to <a>dataSink</a> together with data passed to <code>write()</code> method.
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   415
						It will be used by <a>dataSink</a> for encoding determination.
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   416
						This attribute returns the label last set, or the empty DOMString if never set.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   417
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   418
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   419
					<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   420
						This parameter is not designed to be specified as an argument of write() since it's not likely to be changed frequently.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   421
					</section>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   422
				</dd>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   423
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   424
				<dt>Promise&amp;lt;unsigned long long&gt; write()</dt>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   425
				<dd>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   426
					<p>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   427
						This method writes the specified <var>data</var> to <a>dataSink</a>.
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   428
					</p>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   429
85
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   430
					<section class="note">
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   431
						<p>
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   432
							write() returns a Promise to make it easy for byte stream producing code to react to backpressure.
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   433
						</p>
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   434
					</section>
885937bdcc17 Fix bug24021. Typo in process pendingWriteQueue
Takeshi Yoshino <tyoshino@google.com>
parents: 84
diff changeset
   435
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   436
					<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   437
						This method must run the steps below:
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   438
						<ol>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   439
							<li>Let <var>latchedEncoding</var> be the current value of <a href="#widl-WritableStream-writeEncoding">writeEncoding</a></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   440
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   441
							<li><a>Abort wait</a></li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   442
132
fc2bc870e7a8 cost argument -> costOverride
Takeshi Yoshino <tyoshino@google.com>
parents: 131
diff changeset
   443
							<li>
fc2bc870e7a8 cost argument -> costOverride
Takeshi Yoshino <tyoshino@google.com>
parents: 131
diff changeset
   444
								If <var>costOverride</var> argument is specified, let <var>amountToWrite</var> be <var>costOverride</var> argument.
fc2bc870e7a8 cost argument -> costOverride
Takeshi Yoshino <tyoshino@google.com>
parents: 131
diff changeset
   445
								Otherwise, let <var>amountToWrite</var> be the <a>cost</a> of <var>data</var>
fc2bc870e7a8 cost argument -> costOverride
Takeshi Yoshino <tyoshino@google.com>
parents: 131
diff changeset
   446
							</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   447
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   448
							<li>Let <var>writePromise</var> be a newly-created <a>Promise</a></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   449
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   450
							<li>Let <var>pendingWrite</var> be a newly-created <a>PendingWriteDescriptor</a></li>
98
3b89f8cea0fd More tuple -> pendingWrite renaming
Takeshi Yoshino <tyoshino@google.com>
parents: 97
diff changeset
   451
							<li>Set <var>pendingWrite.promise</var> to <var>writePromise</var></li>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   452
							<li>Set <var>pendingWrite.amount</var> to <var>amountToWrite</var></li>
98
3b89f8cea0fd More tuple -> pendingWrite renaming
Takeshi Yoshino <tyoshino@google.com>
parents: 97
diff changeset
   453
							<li>Push <var>pendingWrite</var> to <a>pendingWriteQueue</a></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   454
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   455
							<li><a>Process pendingWriteQueue</a></li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   456
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   457
							<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   458
								Run the steps below possibly asynchronously:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   459
109
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   460
								<dl class="switch">
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   461
									<dt>If <var>data</var> is a <a>DOMString</a></dt>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   462
									<dd>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   463
										Write <var>data</var> to <a>dataSink</a> together with <var>latchedEncoding</var> as <var>encoding</var> parameter.
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   464
										Interpretation of <var>latchedEncoding</var> is up to <a>dataSink</a>.
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   465
									</dd>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   466
									<dt>Otherwise</dt>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   467
									<dd>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   468
										Write <var>data</var> to <a>dataSink</a>.
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   469
									</dd>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   470
								</dl>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   471
							</li>
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   472
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   473
							<li>Return <var>writePromise</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   474
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   475
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   476
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   477
					<p>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   478
						WritableStream interface doesn't guarantee that <var>data</var> argument is cloned.
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   479
						Modifications made on <var>data</var> argument after <code>write()</code> method call may affect the data written to <a>dataSink</a>.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   480
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   481
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   482
					<dl class="parameters">
111
f3c425cc88db write accepts any data
Takeshi Yoshino <tyoshino@google.com>
parents: 110
diff changeset
   483
						<dt>any data</dt>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   484
						<dd>Data to write.</dd>
132
fc2bc870e7a8 cost argument -> costOverride
Takeshi Yoshino <tyoshino@google.com>
parents: 131
diff changeset
   485
						<dt>optional [Clamp] unsigned long long costOverride</dt>
115
14b1075d41d8 Define cost
Takeshi Yoshino <tyoshino@google.com>
parents: 111
diff changeset
   486
						<dd>Overrides <a>cost</a> of data.</dd>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   487
					</dl>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   488
				</dd>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   489
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   490
				<dt>Promise&amp;lt;unsigned long long&gt; awaitSpaceAvailable()</dt>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   491
				<dd>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   492
					<p>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   493
						The returned Promise will be fulfilled with the data <a>cost</a> which <a>dataSink</a> can accept when <a>dataSink</a> becomes able to accept data with any non-zero amount of cost.
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   494
					</p>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   495
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   496
					<p>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   497
						This method must run the steps below:
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   498
						<ol>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   499
							<li><a>Abort awaitSpace</a></li>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   500
							<li>Set <a>awaitSpacePromise</a> to a newly-created <a>Promise</a></li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   501
							<li>Return <a>awaitSpacePromise</a></li>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   502
						</ol>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   503
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   504
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   505
103
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   506
				<dt>Promise&amp;lt;undefined&gt; writeClose()</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   507
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   508
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   509
						This method tells the WritableStream that no more data will be written to it.
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   510
					</p>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   511
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   512
						Once writeClose() has been called on a WritableStream, no further method calls can be made on the WritableStream.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   513
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   514
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   515
					<p>
103
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   516
						This method must run the steps below:
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   517
						<ol>
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   518
							<li>Let <var>closePromise</var> be a newly-created <a>Promise</a></li>
103
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   519
							<li>Return <var>closePromise</var>, and then continue the process the steps in this algorithm</li>
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   520
							<li>Write the EOF to <a>dataSink</a></li>
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   521
							<li>Wait until <a>dataSink</a> acknowledges the EOF</li>
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   522
							<li>Fulfill <var>closePromise</var> with <code>undefined</code></li>
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   523
						</ol>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   524
					</p>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   525
				</dd>
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   526
118
360cd31579a7 Make reason optional
Takeshi Yoshino <tyoshino@google.com>
parents: 117
diff changeset
   527
				<dt>Promise&amp;lt;undefined&gt; writeAbort(optional any reason)</dt>
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   528
				<dd>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   529
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   530
						This method tells the WritableStream that no more data will be written to it with indication of error.
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   531
						The details of the error will be given by <var>reason</var> argument.
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   532
						The interpretation of <var>reason</var> is up to <a>dataSink</a>.
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   533
					</p>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   534
					<p>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   535
						Once this method has been called on a WritableStream, no further method calls can be made on the WritableStream.
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   536
					</p>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   537
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   538
					<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   539
						This method must run the steps below:
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   540
						<ol>
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   541
							<li>Let <var>abortPromise</var> be a newly-created <a>Promise</a></li>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   542
							<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   543
								Run the steps below possibly asynchronously:
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   544
								<ol>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   545
									<li><a>Write-abort</a> <a>dataSink</a> with <var>reason</var></li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   546
									<li>Wait until <a>dataSink</a> acknowledges the <a>write-abort</a></li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   547
									<li>Fulfill <var>abortPromise</var> with <code>undefined</code></li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   548
								</ol>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   549
							</li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   550
							<li>Return <var>abortPromise</var></li>
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   551
						</ol>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   552
					</p>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   553
				</dd>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   554
			</dl>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   555
		</section>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   556
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   557
		<section class="section">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   558
			<h2>Data sink model</h2>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   559
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   560
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   561
				The data sink is the underlying mechanism which a <a>WritableStream</a> interacts with and stores its data in.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   562
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   563
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   564
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   565
				A data sink to which the <a>WritableStream</a> interface writes bytes can be anything which:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   566
				<ol>
109
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   567
					<li>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   568
						Accepts data possibly together with a <a>DOMString</a> parameter named <var>encoding</var> indicating in what encoding the data must be interpreted.
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   569
					</li>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   570
					<li>
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   571
						Accepts the EOF signal
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   572
					</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   573
					<li>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   574
						Accepts the <dfn>write-abort</dfn> signal with an object parameter named reason.
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   575
					</li>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   576
					<li>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   577
						Notifies <a>WritableStream</a> of how much data the data sink can newly accept.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   578
						When and how to generate such notifications is up to data sinks.
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   579
						Data sinks must be able to accept data more than it notified <a>WritableStream</a> of.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   580
					</li>
103
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   581
					<li>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   582
						Notifies <a>WritableStream</a> of that the data sink is gone.
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   583
						This signal may mean an error.
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   584
						If it means an error, an object indicating the details of the error is attached.
116
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   585
					</li>
d59e463a9181 Add writeAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 115
diff changeset
   586
					<li>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   587
						Notifies <a>WritableStream</a> of acknowledgement of the EOF signal.
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   588
					</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   589
					<li>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   590
						Notifies <a>WritableStream</a> of acknowledgement of the write-abort signal with error detail object.
103
56c80502bb30 Change writeClose() return type to Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 102
diff changeset
   591
					</li>
109
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   592
					<li>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   593
						It's defined how to calculate an integer value <dfn>cost</dfn> of each object which the data sink can consume.
109
44cada6acb2f Make write() agnostic to data type
Takeshi Yoshino <tyoshino@google.com>
parents: 108
diff changeset
   594
					</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   595
				</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   596
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   597
		</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   598
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   599
		<section class="section" id='interactingWithDataSink'>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   600
			<h2>Interacting with the data sink</h2>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   601
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   602
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   603
				This section defines the internal mechanisms for how the WritableStream interacts with <a>dataSink</a>.
93
33fa9ecdbe74 A bit tweak on data sink definition
Takeshi Yoshino <tyoshino@google.com>
parents: 92
diff changeset
   604
				This section specifies both the internal properties as well as the algorithms.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   605
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   606
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   607
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   608
				A WritableStream has an associated integer variable <dfn>spaceAvailable</dfn> which holds the number of bytes that <a>dataSink</a> requested but not yet written to it.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   609
				This variable is initialized to 0 on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   610
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   611
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   612
			<p>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   613
				A WritableStream has an associated <a>Promise</a> <dfn>awaitSpacePromise</dfn> which is used by the <code>awaitSpaceAvailable()</code> method.
93
33fa9ecdbe74 A bit tweak on data sink definition
Takeshi Yoshino <tyoshino@google.com>
parents: 92
diff changeset
   614
				This variable is initialized to <code>null</code> on construction.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   615
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   616
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   617
			<p>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   618
				To <dfn>abort awaitSpace</dfn>, run the steps below:
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   619
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   620
				<ol>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   621
					<li>If <a>awaitSpacePromise</a> is <code>null</code>, terminate these steps</li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   622
					<li>Let <var>detachedWaitPromise</var> be <a>awaitSpacePromise</a></li>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   623
					<li>Set <a>awaitSpacePromise</a> to <code>null</code></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   624
					<li>Reject <var>detachedWaitPromise</var> with an "<code><a>AbortError</a></code>"</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   625
				</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   626
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   627
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   628
			<p>
94
e06bf08768db Formatting data sink definition
Takeshi Yoshino <tyoshino@google.com>
parents: 93
diff changeset
   629
				A struct type <dfn>PendingWriteDescriptor</dfn> has the following members:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   630
				<ul>
91
3ed9f08a1f23 Renames for readability
Takeshi Yoshino <tyoshino@google.com>
parents: 90
diff changeset
   631
					<li>A <a>Promise</a> <var>promise</var></li>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   632
					<li>An integer <var>amount</var></li>
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   633
					<li>An integer <var>ackedAmount</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   634
				</ul>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   635
			</p>
94
e06bf08768db Formatting data sink definition
Takeshi Yoshino <tyoshino@google.com>
parents: 93
diff changeset
   636
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   637
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   638
				A WritableStream has an associated queue <dfn>pendingWriteQueue</dfn> which holds <a>PendingWriteDescriptor</a>s.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   639
				This queue is initialized to an empty queue on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   640
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   641
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   642
			<p>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   643
				To <dfn>process pendingWriteQueue</dfn>, run the steps below:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   644
				<ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   645
					<li>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   646
						While <a>pendingWriteQueue</a> is not empty, repeat the steps below:
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   647
						<ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   648
							<li>Let <var>pendingWrite</var> be the head element of <a>pendingWriteQueue</a></li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   649
							<li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   650
								<dl class="switch">
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   651
									<dt>If <a>sinkGone</a> is set</dt>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   652
									<dd>
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   653
										<ol>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   654
											<li>Pop <var>pendingWrite</var> from <a>pendingWriteQueue</a>, and then</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   655
											<li>If <var>pendingWrite.promise</var> is not <code>null</code>, reject it with <a>sinkErrorDetail</a></li>
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   656
										</ol>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   657
									</dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   658
									<dt>Otherwise</dt>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   659
									<dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   660
										<ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   661
											<li>Let <var>amountToAcknowledge</var> be min(<var>pendingWrite.amount</var> - <var>pendingWrite.ackedAmount</var>, <a>spaceAvailable</a>)</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   662
											<li>Set <a>spaceAvailable</a> to <a>spaceAvailable</a> - <var>amountToAcknowledge</var></li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   663
											<li>Set <var>pendingWrite.ackedAmount</var> to <var>pendingWrite.ackedAmount</var> + <var>amountToAcknowledge</var></li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   664
											<li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   665
												<dl class="switch">
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   666
													<dt>If <var>pendingWrite.ackedAmount</var> equals to <var>pendingWrite.amount</var></dt>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   667
													<dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   668
														<ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   669
															<li>Pop <var>pendingWrite</var> from <a>pendingWriteQueue</a></li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   670
															<li>If <var>pendingWrite.promise</var> is not <code>null</code>, fulfill it with <var>pendingWrite.amount</var></li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   671
														</ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   672
													</dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   673
													<dt>Otherwise</dt>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   674
													<dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   675
														Exit from this loop
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   676
													</dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   677
												</dl>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   678
											</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   679
										</ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   680
									</dd>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   681
								</dl>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   682
							</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   683
						</ol>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   684
					</li>
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   685
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   686
					<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   687
						If <a>pendingWriteQueue</a> is empty and <a>spaceAvailable</a> is not 0 and <a>awaitSpacePromise</a> is not <code>null</code>, run the steps below:
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   688
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   689
						<ol>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   690
							<li>Let <var>detachedPromise</var> be <a>awaitSpacePromise</a></li>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   691
							<li>Set <a>awaitSpacePromise</a> to <code>null</code></li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   692
							<li>Fulfill <var>detachedPromise</var> with <a>spaceAvailable</a></li>
127
bf65397910b7 More rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 126
diff changeset
   693
						</ol>
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   694
					</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   695
				</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   696
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   697
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   698
			<p>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   699
				When <a>dataSink</a> requests <var>amountNewlyRequested</var> more data, queue a task which runs the steps below:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   700
				<ol>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   701
					<li>Set <a>spaceAvailable</a> to <a>spaceAvailable</a> + <var>amountNewlyRequested</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   702
					<li><a>Process pendingWriteQueue</a></li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   703
				</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   704
			</p>
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   705
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   706
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   707
				A WritableStream has an associated flag <dfn>sinkGone</dfn> which is set when the data sink is gone.
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   708
			</p>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   709
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   710
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   711
				A WritableStream has an associated object <dfn>sinkErrorDetail</dfn> which is initialized to null, and when the data sink is gone, set to the error detail object.
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   712
			</p>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   713
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   714
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   715
				When <a>dataSink</a> notifies the WritableStream of that the data sink is gone, queue a task which runs the steps below:
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   716
				<ol>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   717
					<li>Set <a>sinkGone</a></li>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   718
					<li>Set <a>sinkErrorDetail</a> to the error detail object</li>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   719
					<li><a>Process pendingWriteQueue</a></li>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   720
				</ol>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
   721
			</p>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   722
		</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   723
	</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   724
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   725
	<section class="section" id="readableByteStream">
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   726
		<h2>ReadableStream Interface</h2>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   727
		<p>
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   728
			The ReadableStream interface defines a protocol for APIs which produce a data stream.
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   729
			This protocol includes:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   730
			<ol>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   731
				<li>How to receive read requests from the reader (data consuming code) and pass output data to the reader</li>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   732
				<li>How to transfer data in bulk to another <a>WritableStream</a> (by using the <code>pipe()</code> method)</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   733
				<li>How to mirror data to multiple destinations (by using the <code>fork()</code>)</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   734
			</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   735
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   736
			By returning a <a>Promise</a> and delaying fulfillment of it, the ReadableStream realizes asynchronous data consumption.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   737
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   738
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   739
		<p>
77
3e2335dbad62 Rewording
Takeshi Yoshino <tyoshino@google.com>
parents: 76
diff changeset
   740
			Interfaces introduced in this section provide simple and convenient ways to consume data.
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   741
			They connect arbitrary data stream producer and data consuming code using Promises and method invocations.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   742
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   743
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   744
		<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   745
			A ReadableStream has a one-to-one mapping with an associated <a href="#readableByteStreamDataSource">data source</a>, and has defined semantics for <a href='#interactingWithDataSource'>interacting with the data source internally</a>.
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   746
			A data source, however, can have a one-to-many relationship with ReadableStreams, in cases where <code>fork()</code> is used.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   747
		</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   748
77
3e2335dbad62 Rewording
Takeshi Yoshino <tyoshino@google.com>
parents: 76
diff changeset
   749
		<section class="section" id="readableByteStreamInterface">
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   750
			<h3>ReadableStream interface</h3>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   751
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   752
			<dl class="idl" title="interface ReadableStream">
125
98448480356b ByteStreamReadType -> StreamReadType
Takeshi Yoshino <tyoshino@google.com>
parents: 124
diff changeset
   753
				<dt>attribute StreamReadType readBinaryAs</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   754
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   755
					<p>
114
6cd4d6696cb8 Change readExact to readUpTo and make it able to handle non-byte type data
Takeshi Yoshino <tyoshino@google.com>
parents: 113
diff changeset
   756
						Specifies what data type will be returned by a <code>read()</code> and <code>readUpTo()</code> method call.
125
98448480356b ByteStreamReadType -> StreamReadType
Takeshi Yoshino <tyoshino@google.com>
parents: 124
diff changeset
   757
						This attribute can be set to any of the supported types in <a>StreamReadType</a>.
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   758
					<p>
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   759
					</p>
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   760
						The default value for this attribute is "<code>as-is</code>".
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   761
					</p>
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   762
					<p>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   763
						Values other than "<code>as-is</code>" works only when the data to be read from the ReadableStream represents binary data.
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   764
					</p>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   765
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   766
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   767
				<dt>attribute DOMString readEncoding</dt>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   768
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   769
					<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   770
						Specifies a <a>DOMString</a> that represents the label of an encoding [[!EncodingDetermination]].
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   771
						If set, it will be used as part of the encoding determination used when processing a <code>read()</code> and <code>readUpTo()</code> method call.
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   772
					</p>
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   773
					<p>
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   774
						This attribute works only when the data to be read from the ReadableStream represents binary data.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   775
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   776
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   777
					<section class="note">
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   778
						This parameter is not designed to be specified as an argument of the reading methods since it's not likely to be changed frequently.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   779
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   780
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   781
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   782
				<dt>attribute unsigned long long pullAmount</dt>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   783
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   784
					<p>
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   785
						This attribute provides the ReadableStream with a hint of how much data the reader can consume currently.
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   786
					</p>
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   787
					<p>
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   788
						Each implementation of the ReadableStream must initialize the value of pullAmount on construction.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   789
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   790
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   791
					<p>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   792
						When this attribute is set, the user agent must <a>retrieve data</a>.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   793
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   794
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   795
					<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   796
						This flow control functionality is provided as a separated attribute rather than as an argument of the read() method based on the assumption that this value is not changed frequently.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   797
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   798
					<section class="note">
128
56491a744f4d ReadableStream rewriting
Takeshi Yoshino <tyoshino@google.com>
parents: 127
diff changeset
   799
						It's possible that the cost of data received by <code>read()</code> is more than the pullAmount value.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   800
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   801
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   802
124
9dc273a030cc - ByteStreamReadResult -> StreamReadResult
Takeshi Yoshino <tyoshino@google.com>
parents: 123
diff changeset
   803
				<dt>Promise&amp;lt;StreamReadResult&gt; readUpTo()</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   804
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   805
					<p>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   806
						This method reads binary data from the ReadableStream.
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   807
						The returned <a>Promise</a> is fulfilled when any of the following conditions is met:
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   808
						<ul>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   809
							<li>The total size of produced bytes becomes equal to <var></var></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   810
							<li>The EOF is reached</li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   811
						</ul>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   812
						The <a>cost</a> of data returned by this method can be less than <var>size</var> when data cannot be fully converted into the type specified by <a href="#widl-ReadableStream-readBinaryAs">readBinaryAs</a> or the EOF is reached.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   813
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   814
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   815
					<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   816
						This method must run the steps below:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   817
						<ol>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   818
							<li>If <a href="#widl-ReadableStream-readBinaryAs">readBinaryAs</a> is "<code>as-is</code>", return a <a>Promise</a> rejected with a "<code><a>SyntaxError</a></code>"</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   819
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   820
							<li>If <a>pendingRead</a> is not <code>null</code>, return a <a>Promise</a> rejected with an "<code><a>InvalidStateError</a></code>"</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   821
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   822
							<li>Let <var>readPromise</var> be a newly-created <a>Promise</a></li>
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   823
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   824
							<li>Set <a>pendingRead</a> to a newly-created <a>PendingReadDescriptor</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   825
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   826
							<li>Set <a>pendingRead</a>.<var>binaryAs</var> to the current value of <a href="#widl-ReadableStream-readBinaryAs">readBinaryAs</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   827
							<li>Set <a>pendingRead</a>.<var>encoding</var> to the current value of <a href="#widl-ReadableStream-readEncoding">readEncoding</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   828
							<li>Set <a>pendingRead</a>.<var>size</var> to <var>size</var></li>
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   829
							<li>Set <a>pendingRead</a>.<var>promise</var> to <var>readPromise</var></li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   830
							<li>Set <a>pendingRead</a>.<var>destination</var> to <code>undefined</code></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   831
114
6cd4d6696cb8 Change readExact to readUpTo and make it able to handle non-byte type data
Takeshi Yoshino <tyoshino@google.com>
parents: 113
diff changeset
   832
							<li>Set <a>readUpToPullAmount</a> to <var>size</var></li>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   833
							<li>Set <a>amountBeingReturned</a> to 0</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   834
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   835
							<li><a>Retrieve data</a> possibly asynchronously</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   836
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   837
							<li>Return <var>readPromise</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   838
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   839
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   840
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   841
					<dl class="parameters">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   842
						<dt>[Clamp] unsigned long long size</dt>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   843
						<dd>Upper limit of total cost of data to be read</dd>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   844
					</dl>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   845
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   846
					<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   847
						This method is useful if
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   848
						<ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   849
							<li>You don't want to get notified of new data unless bytes of the specified number become available.</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   850
							<li>You don't want to get your data fragmented into multiple parts, thus avoiding the need to buffer and combine chunks yourself.</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   851
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   852
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   853
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   854
124
9dc273a030cc - ByteStreamReadResult -> StreamReadResult
Takeshi Yoshino <tyoshino@google.com>
parents: 123
diff changeset
   855
				<dt>Promise&amp;lt;StreamReadResult&gt; read()</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   856
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   857
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   858
						This method reads data from the ReadableStream.
124
9dc273a030cc - ByteStreamReadResult -> StreamReadResult
Takeshi Yoshino <tyoshino@google.com>
parents: 123
diff changeset
   859
						The speed of reading can be roughly adjusted by using <a href="#widl-StreamReadResult-pullAmount">pullAmount</a>.
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   860
						<a href="#widl-StreamReadResult-pullAmount">pullAmount</a> doesn't necessarily limit the size of data being read by this method.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   861
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   862
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   863
					<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   864
						This method must run the steps below:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   865
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   866
						<ol>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   867
							<li>If <a>pendingRead</a> is not <code>null</code>, return a Promise reject with an "<code><a>InvalidStateError</a></code>"</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   868
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   869
							<li>Let <var>readPromise</var> be a newly-created <a>Promise</a></li>
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   870
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   871
							<li>Set <a>pendingRead</a> to a newly-created <a>PendingReadDescriptor</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   872
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   873
							<li>Set <a>pendingRead</a>.<var>binaryAs</var> to the current value of <a href="#widl-ReadableStream-readBinaryAs">readBinaryAs</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   874
							<li>Set <a>pendingRead</a>.<var>encoding</var> to the current value of <a href="#widl-ReadableStream-readEncoding">readEncoding</a></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   875
							<li>Set <a>pendingRead</a>.<var>size</var> to <code>undefined</code></li>
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   876
							<li>Set <a>pendingRead</a>.<var>promise</var> to <var>readPromise</var></li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   877
							<li>Set <a>pendingRead</a>.<var>destination</var> to <code>undefined</code></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   878
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   879
							<li>Set <a>amountBeingReturned</a> to 0</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   880
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   881
							<li><a>Retrieve data</a> possibly asynchronously</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   882
136
351c58f63ce5 pendingRead may be null when returning pendingRead.promise. Use local
Takeshi Yoshino <tyoshino@google.com>
parents: 135
diff changeset
   883
							<li>Return <var>readPromise</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   884
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   885
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   886
78
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
   887
					<p>
83
afed6501a898 moved images, fixed typos, fixed header
fmoussa <feras.moussa@hotmail.com>
parents: 81
diff changeset
   888
						<img src="images/fulfilling.png" alt="How new data is automatically fetched">
78
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
   889
					</p>
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
   890
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   891
					<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   892
						This method is useful if
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   893
						<ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   894
							<li>You don't care in what size and as how many fragments the data will be received</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   895
							<li>You want to limit the number of bytes read for flow control</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   896
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   897
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   898
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   899
124
9dc273a030cc - ByteStreamReadResult -> StreamReadResult
Takeshi Yoshino <tyoshino@google.com>
parents: 123
diff changeset
   900
				<dt>Promise&amp;lt;StreamReadResult&gt; pipe()</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   901
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   902
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   903
						This method bulk transfers bytes from the ReadableStream to another <a>WritableStream</a>.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   904
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   905
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   906
					<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   907
						Fulfillment of the returned Promise doesn't necessarily mean that the data transferred to <var>destination</var> has been successfully read from it.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   908
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   909
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   910
					<section class="note">
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   911
						TODO: Rewrite this to update <a>amountBeingReturned</a> as numBytesAcknowledged of <a>PendingWriteDescriptor</a>s are updated
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   912
					</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   913
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   914
					<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   915
						This method must run the steps below:
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   916
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   917
						<ol>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   918
							<li>If <a>pendingRead</a> is not <code>null</code>, return a <a>Promise</a> rejected with an "<code><a>InvalidStateError</a></code>"</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   919
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   920
							<li>Set <var>pipePromise</var> be a newly-created <a>Promise</a></li>
137
142342673c3f - Some rephrasing
Takeshi Yoshino <tyoshino@google.com>
parents: 136
diff changeset
   921
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   922
							<li>Set <a>pendingRead</a> to a newly-created <a>PendingReadDescriptor</a></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   923
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   924
							<li>Set <a>pendingRead</a>.<var>binaryAs</var> to <code>undefined</code></li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   925
							<li>Set <a>pendingRead</a>.<var>encoding</var> to <code>undefined</code></li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   926
							<li>Set <a>pendingRead</a>.<var>size</var> to <var>size</var> argument</li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   927
							<li>Set <a>pendingRead</a>.<var>promise</var> to <var>pipePromise</var></li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   928
							<li>Set <a>pendingRead</a>.<var>destination</var> to <var>destination</var> argument</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   929
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   930
							<li><a>Wait for destination</a> possibly asynchronously</li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   931
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   932
							<li>Return <var>pipePromise</var></li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   933
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   934
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   935
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   936
					<dl class="parameters">
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   937
						<dt>WritableStream destination</dt>
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   938
						<dd>Destination <a>WritableStream</a>.</dd>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   939
						<dt>optional [Clamp] unsigned long long size</dt>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   940
						<dd>Number of bytes to transfer.</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   941
					</dl>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   942
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   943
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   944
				<dt>ReadableStream fork()</dt>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   945
				<dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   946
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   947
						This method creates a new ReadableStream which refers to the same <a>dataSource</a> as the current ReadableStream.
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   948
						Data sources are range reference counted so that a range in a data source is freed only when all the ReadableStreams sharing the data source finish consuming it.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   949
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   950
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   951
					<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   952
						This method must run the steps below:
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   953
						<ol>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   954
							<li>Let <var>branch</var> be a new ReadableStream which refers to <a>dataSource</a> and has the same <a>amountRequested</a> value, <a>readDataBuffer</a> contents and <a>eofReached</a> value as the current ReadableStream.</li>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
   955
							<li>If <a>amountRequested</a> is not 0, up to <a>amountRequested</a> bytes arriving in the future must be forwarded to <var>branch</var>.</li>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   956
							<li>Return <var>branch</var>.</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   957
						</ol>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   958
					</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   959
				</dd>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   960
118
360cd31579a7 Make reason optional
Takeshi Yoshino <tyoshino@google.com>
parents: 117
diff changeset
   961
				<dt>Promise&amp;lt;undefined&gt; readAbort(optional any reason)</dt>
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   962
				<dd>
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   963
					<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   964
						This method tells the ReadableStream that no more data will be read from it optionally with indication of error.
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   965
						The details of the error will be given by <var>reason</var> argument.
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   966
						The interpretation of <var>reason</var> is up to <a>dataSource</a>.
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   967
					</p>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   968
					<p>
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   969
						Once this method has been called on a ReadableStream, no further method calls can be made on the ReadableStream.
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   970
					</p>
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   971
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   972
					<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   973
						This method must run the steps below:
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   974
						<ol>
129
855e24afba79 - new -> newly-create
Takeshi Yoshino <tyoshino@google.com>
parents: 128
diff changeset
   975
							<li>Let <var>abortPromise</var> be a newly-created <a>Promise</a></li>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   976
							<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   977
								Run the steps below possibly asynchronously:
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   978
								<ol>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   979
									<li><a>Read-abort</a> <a>dataSource</a> with <var>reason</var></li>
135
8bc65bdf4605 - Some reorg of algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 134
diff changeset
   980
									<li>Wait until <a>dataSource</a> acknowledges the <a>read-abort</a></li>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   981
									<li>Fulfill <var>abortPromise</var> with <code>undefined</code></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   982
								</ol>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   983
							</li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
   984
							<li>Return <var>abortPromise</var></li>
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   985
						</ol>
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   986
					</p>
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
   987
				</dd>
37
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   988
			</dl>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   989
		</section>
0de575d7b79a - Unify indentation to tabs.
Takeshi Yoshino <tyoshino@google.com>
parents: 35
diff changeset
   990
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   991
		<section class="section" id='readableByteStreamDataSource'>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   992
			<h3>Data source model</h3>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   993
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   994
			<p>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   995
				A data source produces data stream to be consumed via the <a>ReadableStream</a> interface instances.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
   996
				A <a>ReadableStream</a> retrieves data from an associated data source.
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
   997
				The data source model is not directly surfaced in the API, and is described here to provide details on how internal operations such as <a href="#widl-ReadableStream-fork-ReadableStream">fork()</a> can be handled.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   998
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
   999
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1000
			<p>
95
af7f31ca4da3 Data source rephrasing and clarification
Takeshi Yoshino <tyoshino@google.com>
parents: 94
diff changeset
  1001
				A <dfn>data source</dfn> can be anything that:
af7f31ca4da3 Data source rephrasing and clarification
Takeshi Yoshino <tyoshino@google.com>
parents: 94
diff changeset
  1002
				<ul>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1003
					<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1004
						Produces data.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1005
						Newly produced data will be delivered to the associated <a>ReadableStream</a>.
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1006
					</li>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1007
					<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1008
						Notifies <a>ReadableStream</a> of the <dfn>read EOF</dfn> signal.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1009
						This signal may include indication of an error.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1010
						When it indicates an error, an object which represents the details of the error is attached.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1011
					</li>
104
69234a5f02a6 Change readClose to return a Promise
Takeshi Yoshino <tyoshino@google.com>
parents: 103
diff changeset
  1012
					<li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1013
						Accepts requests for production of data from a <a>ReadableStream</a>.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1014
						A data production request consists of an integer indicating the total cost of data to produce in addition to already requested ones.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1015
						Interpretation of the request is up to each data source.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1016
						Data sources may respond to retrieval requests with data larger than requested.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1017
						Requests and delivery of data don't need to 1-to-1 correspond.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1018
						Data sources may produce data and send to <a>ReadableStream</a> unsolicitedly without receiving any retrieval request.
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1019
					</li>
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1020
					<li>
139
ea63ef46f36e More fix
Takeshi Yoshino <tyoshino@google.com>
parents: 138
diff changeset
  1021
						Accepts and acknowledges <dfn>read-abort</dfn> signal which means the associated <a>ReadableStream</a> has completed consuming data from this data source optionally with indication of any error.
117
6ccb7d75a511 Add readAbort
Takeshi Yoshino <tyoshino@google.com>
parents: 116
diff changeset
  1022
					</li>
95
af7f31ca4da3 Data source rephrasing and clarification
Takeshi Yoshino <tyoshino@google.com>
parents: 94
diff changeset
  1023
				</ul>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1024
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1025
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1026
			<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1027
				To allow multiple consumers, we use a wrapper <dfn>data source wrapper</dfn> for range reference counting on produced bytes.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1028
				A <a>data source wrapper</a> has the following functionalities:
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1029
				<ul>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1030
					<li>has a <var>queue</var> to which newly produced bytes are pushed</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1031
					<li>has a sorted map <dfn>cursorMap</dfn> whose key is reader ID and value is integer called cursor</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1032
					<li>can issue reader IDs which are unique to the <a>data source wrapper</a> instance when requested</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1033
					<li>pops bytes from <var>queue</var> when the smallest cursor in <a>cursorMap</a> by the difference of the new smallest cursor and the old smallest cursor</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1034
					<li>when there's not sufficient bytes in <var>queue</var> to respond to coming retrieval request, retrieves bytes from the wrapped data source</li>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1035
				</ul>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1036
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1037
87
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1038
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1039
				When <a href="#widl-ReadableStream-fork-ReadableStream">fork()</a> is called, a new reader is registered to the original <a>ReadableStream</a>'s data source and the new <a>ReadableStream</a> uses read() method to fetch data from it.
87
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1040
			</p>
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1041
		</section>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1042
87
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1043
		<section class="section" id="interactingWithDataSource">
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1044
			<h2>Interacting with the data source</h2>
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1045
dcf26e7c77fe Break at the end of each sentence.
Takeshi Yoshino <tyoshino@google.com>
parents: 86
diff changeset
  1046
			<section class="note">
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1047
				This interface is designed to work even if operations on <a>dataSource</a> are asynchronous.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1048
				If <a>dataSource</a> is synchronously accessible, some of the algorithms can be simplified.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1049
			</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1050
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1051
			<p>
139
ea63ef46f36e More fix
Takeshi Yoshino <tyoshino@google.com>
parents: 138
diff changeset
  1052
				A <a>ReadableStream</a> has an associated <a>data source</a> referred by <dfn>dataSource</dfn> from which the ReadableStream retrieves data.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1053
				The data source model is explained in <a href="#h2_data_source">this section</a>.
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1054
				A data source can be shared by multiple ReadableStream instances when <code>fork()</code> is used.
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1055
				A ReadableStream is registered with a data source on construction and given a reader ID.
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1056
				The <a>dataSource</a> of a ReadableStream refers to its data source, and <dfn>readerId</dfn> of a ReadableStream refers to its reader ID.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1057
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1058
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1059
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1060
				A ReadableStream has the following internal mechanisms:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1061
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1062
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1063
			<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1064
				An associated flag <dfn>readPending</dfn> which prevents multiple read operations from being run.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1065
				This flag is set to false on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1066
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1067
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1068
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1069
				An associated integer variable <dfn>readUpToPullAmount</dfn> which temporarily overrides <a href="#widl-ReadableStream-pullAmount">pullAmount</a> if necessary for a <code>readUpTo()</code> method call.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1070
				This variable is initialized to 0 on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1071
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1072
			<p>
123
2c23cbb3665f Revert name back to Readable/WritableStream
Takeshi Yoshino <tyoshino@google.com>
parents: 122
diff changeset
  1073
				An associated integer variable <dfn>pipePullAmount</dfn> which temporarily overrides <a href="#widl-ReadableStream-pullAmount">pullAmount</a> if necessary for a <code>pipe()</code> method call.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1074
				This variable is initialized to 0 on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1075
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1076
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1077
			<p>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
  1078
				An associated integer variable <dfn>amountRequested</dfn> which holds the number of bytes being retrieved from the <a>dataSource</a>.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1079
				This variable is initialized to 0 on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1080
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1081
			<p>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
  1082
				An associated integer variable <dfn>amountBeingReturned</dfn> which holds the number of bytes consumed on the last read operation.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1083
				This variable is initialized to 0 on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1084
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1085
				<section class="note">
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
  1086
					amountBeingReturned delays replenishment of pullAmount until the next read()/pipe() operation is made.
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1087
				</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1088
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1089
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1090
			<p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1091
				An associated queue <dfn>readDataBuffer</dfn> which holds the bytes retrieved from <a>dataSource</a>.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1092
				This queue is initialized to an empty queue on construction.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1093
				<section class="note">
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1094
					Retrieved bytes can be queued in <a>readDataBuffer</a> in any form.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1095
					For example, if bytes were retrieved as <a>ArrayBufferView</a> fragments, it's ok to store them as-is to avoid unnecessary copy.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1096
					If the object representing retrieved bytes is a DOMString, that should be accompanied with the encoding to use to decode it.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1097
				</section>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1098
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1099
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1100
			<p>
83
afed6501a898 moved images, fixed typos, fixed header
fmoussa <feras.moussa@hotmail.com>
parents: 81
diff changeset
  1101
				<img src="images/readdatabuffer.png" alt="Read data buffer related variables">
78
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
  1102
			</p>
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
  1103
12c164bee09f Add diagrams
Takeshi Yoshino <tyoshino@google.com>
parents: 77
diff changeset
  1104
			<p>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1105
				A struct type <dfn>PendingReadDescriptor</dfn> has the following members:
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1106
				<ul>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1107
					<li>A <a>Promise</a> <var>promise</var></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1108
					<li>An integer <var>amount</var></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1109
					<li>A <a>DOMString</a> <var>binaryAs</var></li>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1110
					<li>A <a>DOMString</a> <var>encoding</var></li>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Takeshi Yoshino <tyoshino@google.com>
parents: 137
diff changeset
  1111
					<li>A <a>WritableStream</a> <var>destination</var></li>
133
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1112
				</ul>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1113
			</p>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1114
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1115
			<p>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1116
				A WritableStream has an associated <a>PendingReadDescriptor</a> <dfn>pendingRead</dfn>.
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1117
				This variable is initialized to <code>null</code>.
ecde9f975249 Split data output code from read() and readUpTo() algorithm
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parents: 132
diff changeset
  1118
			</p>
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1119
ecde9f975249 Split data output code from read() and readUpTo() algorithm
Takeshi Yoshino <tyoshino@google.com>
parents: 132
diff changeset
  1120
			<p>
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1121
				An associated flag <dfn>eofReached</dfn> which indicates that the EOF was received from the <a>dataSource</a>.
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1122
			</p>
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1123
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1124
			<p>
119
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1125
				An associated object <dfn>sourceErrorDetail</dfn> which is initialized to <code>null</code>, and once the EOF meaning an error is received from the <a>dataSource</a>, set to the error detail object.
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1126
			</p>
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1127
218f3b3a2df5 Add how to notify abort/error signal
Takeshi Yoshino <tyoshino@google.com>
parents: 118
diff changeset
  1128
			<p>
107
276491848949 Rename variables agnostic to type of data Streams API handles
Takeshi Yoshino <tyoshino@google.com>
parents: 106
diff changeset
  1129
				To <dfn>retrieve data</dfn>, run the steps below:
76
63f6521d7457 Moved preview to overview, and added note about preview deprication
fmoussa <feras.moussa@hotmail.com>
parents: 46
diff changeset
  1130
				<ol>
138
6cc871794be1 - refactored pipe algorithm and merged with ones for read() and readUpTo()
Ta