discovery-api/Overview.src.html
author Rich Tibbett <richt@opera.com>
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<!DOCTYPE html>
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<!--
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  THIS IS THE WORKING VERSION OF THE CURRENT SPECIFICATION!
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  This specification is built using ReSpec.js <http://dev.w3.org/2009/dap/ReSpec.js/documentation.html>
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  From time to time it's necessary to HTML5 Tidy this document using the tool @ <http://w3c.github.com/tidy-html5/>.
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  The command used to format this document (Overview.src.html) is as follows (replacing all = signs with - signs!):
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  @> tidy ==new-blocklevel-tags section ==char-encoding utf8 ==tidy-mark no ==indent yes ==indent-spaces 2 ==indent-attributes yes ==wrap 120 ==fix-bad-comments yes -m Overview.src.html
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  To publish a new compiled version (Overview.html), we need to open this file (Overview.src.html) in any web browser.
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  Once it has loaded we press 'Ctrl + Shift + S' (or 'Cmd' + 'Shift' + 'S' on Mac) and then select
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  'Save as HTML (Source)' from the resulting menu.
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  We then replace Overview.html with the produced HTML source of this process.
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  Next we run HTML5 Tidy over our new Overview.html file with the following command (replacing all = signs with - signs!):
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  @> tidy ==new-blocklevel-tags section ==char-encoding utf8 ==tidy-mark no ==indent yes ==indent-spaces 2 ==indent-attributes yes ==wrap 120 ==hide-comments yes -m Overview.html
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  Now the specification is ready to be published :)
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-->
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<html>
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  <head>
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    <title>
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      Network Service Discovery
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    </title>
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    <meta http-equiv='Content-Type'
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          content='text/html; charset=utf-8'>
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    <script type="text/javascript"
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          class='remove'>
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var respecConfig = {
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          specStatus:   "ED",
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          //publishDate:  "2012-10-04",
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          shortName:    "discovery-api",
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          edDraftURI:   "http://dvcs.w3.org/hg/dap/raw-file/tip/discovery-api/Overview.html",
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          previousMaturity: "FPWD",
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          previousPublishDate: "2012-08-07",
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          editors: [
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            {
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              name:       "Rich Tibbett",
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              //url:        "http://richt.me/",
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              company:    "Opera Software ASA",
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              companyURL: "http://opera.com/"
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            },
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            {
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              name:       "Clarke Stevens",
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              //url:      "",
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              company:    "CableLabs",
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              companyURL: "http://cablelabs.com/"
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            }
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          ],
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          wg:           "Device APIs Working Group",
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          wgURI:        "http://www.w3.org/2009/dap/",
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          wgPublicList: "public-device-apis",
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          wgPatentURI:  "http://www.w3.org/2004/01/pp-impl/43696/status",
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          extraCSS:     ["http://dvcs.w3.org/hg/dap/raw-file/tip/discovery-api/css/respec.nsd.css"],
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//          inlineCSS:    true,
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          noIDLIn:      true
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      };
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    </script>
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    <script src='http://www.w3.org/Tools/respec/respec-w3c-common'
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          type="text/javascript"
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          class='remove'
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          async=""></script>
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  </head>
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  <body>
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    <section id='abstract'>
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      <p>
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        This specification defines a mechanism for an HTML document to discover and subsequently communicate with
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        <abbr title="Hypertext Transfer Protocol">HTTP</abbr>-based services advertised via common discovery protocols
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        within the current network.
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      </p>
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    </section>
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    <section id='sotd'>
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      <p>
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        This document represents the early consensus of the group on the scope and features of the proposed API.
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      </p>
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    </section>
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    <section class="informative">
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      <h3>
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        Introduction
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      </h3>
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      <p>
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        To enable Web pages to connect and communicate with Local-networked Services provided over HTTP, this
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        specification introduces the <a href="#navigatornetworkservice"><code>NavigatorNetworkService</code></a>
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        interface.
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      </p>
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      <p>
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        Using this <abbr title="Application Programming Interface">API</abbr> consists of requesting a well-known
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        service type, known by developers and advertised by Local-networked Devices. User authorization, where the user
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        connects the web page to discovered services, is expected before the web page is able to interact with any
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        Local-networked Services.
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      </p>
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      <p>
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        A web page creates a request to obtain connectivity to services running in the network by specifying a
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        well-known discovery service type that it wishes to interact with.
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      </p>
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      <p>
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        The user agent, having captured all advertised services on the network from the <a>service discovery
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        mechanisms</a> included in this recommendation, attempts to match the requested service type to a discovered
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        service according to the processing described herein.
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      </p>
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      <p>
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        If a service connectivity request is successful then the Web page is provided with the necessary information to
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        communicate with the authorized Local-networked Service. If the request fails then the Web page will receive an
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        error callback containing an error code describing the cause of Local-networked Service connectivity failure.
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      </p>
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      <p>
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        Once connected to a Local-networked Service the Web page can send requests and receive responses to the
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        Local-networked Service via the messaging format and appropriate channel inferred from the service type
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        authorized via the provided API. The Web page, once connected, can also receive service-pushed events, in the
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        messaging format supported by the Local-networked Device, if such event subscription functionality is provided
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        by the connected Local-networked Service.
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      </p>
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      <p>
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        Services available within the local network can connect and disconnect at different times during the execution of a web page. The user agent can inform a web page when the state of networked services matching any of the requested valid service types change. Web pages can use this information to enable in-page experiences for communicating the state of networked services with the ability to change the particular service or set of services the page is connected to (by re-invoking the <a href=
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        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method defined herein).
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      </p>
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      <div class="example">
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        <p>
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          Example of requesting a DNS-SD advertised service:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page
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  for(var i = 0, l = services.length; i &lt; l; i++) console.log( services[i].name );
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}
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navigator.getNetworkServices('zeroconf:_boxee-jsonrpc._tcp', showServices);
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</pre>
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      </div>
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      <div class="example">
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        <p>
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          Example of requesting a UPnP advertised service, also handling error conditions:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page
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  for(var i = 0, l = services.length; i &lt; l; i++) console.log( services[i].name );
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}
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function error( e ) {
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  console.log( "Error occurred: " + e.code );
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}
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navigator.getNetworkServices('upnp:urn:schemas-upnp-org:service:ContentDirectory:1', showServices, error);
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</pre>
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      </div>
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      <div class="example">
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        <p>
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          Example of requesting either a DNS-SD or UPnP advertised service:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page (+ service type)
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  for(var i = 0, l = services.length; i &lt; l; i++)
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     console.log( services[i].name + '(' + services[i].type + ')' );
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}
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navigator.getNetworkServices([
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  'zeroconf:_boxee-jsonrpc._tcp',
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  'upnp:urn:schemas-upnp-org:service:ContentDirectory:1'
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], showServices);
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</pre>
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      </div>
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      <p>
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        For more detailed examples see the <a href="#examples">Examples</a> section.
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      </p>
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    </section>
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    <section id='conformance'>
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      <p>
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        Requirements phrased in the imperative as part of algorithms (such as "strip any leading space characters" or
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        "return false and abort these steps") are to be interpreted with the meaning of the key word ("must", "should",
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        "may", etc) used in introducing the algorithm.
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      </p>
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      <p>
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        Some conformance requirements are phrased as requirements on attributes, methods or objects. Such requirements
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        are to be interpreted as requirements on user agents.
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      </p>
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      <p>
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        Conformance requirements phrased as algorithms or specific steps MAY be implemented in any manner, so long as
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        the end result is equivalent. (In particular, the algorithms defined in this specification are intended to be
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        easy to follow, and not intended to be performant.)
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      </p>
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      <p>
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        The only conformance class defined by this specification is a <dfn>user agent</dfn>.
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      </p>
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      <p>
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        User agents MAY impose implementation-specific limits on otherwise unconstrained inputs, e.g. to prevent denial
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        of service attacks, to guard against running out of memory, or to work around platform-specific limitations.
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      </p>
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      <p>
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        When support for a feature is disabled (e.g. as an emergency measure to mitigate a security problem, or to aid
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        in development, or for performance reasons), user agents MUST act as if they had no support for the feature
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        whatsoever, and as if the feature was not mentioned in this specification. For example, if a particular feature
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        is accessed via an attribute in a Web IDL interface, the attribute itself would be omitted from the objects
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        that implement that interface - leaving the attribute on the object but making it return null or throw an
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        exception is insufficient.
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      </p>
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      <section>
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        <h3>
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          Dependencies
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        </h3>This specification relies on several other underlying specifications.
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        <dl>
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          <dt>
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            HTML
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          </dt>
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          <dd>
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            Many fundamental concepts from HTML are used by this specification. [[!HTML5]]
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          </dd>
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          <dt>
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            WebIDL
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          </dt>
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          <dd>
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            The IDL blocks in this specification use the semantics of the WebIDL specification. [[!WEBIDL]]
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          </dd>
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        </dl>
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      </section>
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    </section>
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    <section>
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      <h3>
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        Terminology
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      </h3>
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      <p>
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        The construction "a <code>Foo</code> object", where <code>Foo</code> is actually an interface, is sometimes
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        used instead of the more accurate "an object implementing the interface <code>Foo</code>".
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      </p>
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      <p>
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        The term DOM is used to refer to the API set made available to scripts in Web applications, and does not
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        necessarily imply the existence of an actual <code>Document</code> object or of any other <code>Node</code>
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        objects as defined in the DOM Core specifications. [[!DOM4]]
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      </p>
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      <p>
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        An IDL attribute is said to be <em>getting</em> when its value is being retrieved (e.g. by author script), and
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        is said to be <em>setting</em> when a new value is assigned to it.
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      </p>
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      <p>
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        A <dfn>valid service type</dfn> is any of the following:
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      </p>
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      <ul>
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        <li>a string that begins with <code>upnp:</code> or <code>zeroconf:</code> followed by one or more characters
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        in the ranges U+0021, U+0023 to U+0027, U+002A to U+002B, U+002D to U+002E, U+0030 to U+0039, U+0041 to U+005A,
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        U+005E to U+007E.
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        </li>
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        <li>a string that begins with <code>dial:</code> followed by an integer version.
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        </li>
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      </ul>
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      <p>
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        A <a>valid service type</a> provided in the <code>type</code> attribute of the <a href=
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        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method will be matched against the
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        services currently contained in the <a>list of available service records</a> according to the algorithms
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        defined in this specification.
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      </p>
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      <p>
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        A <dfn>user-agent generated callback url</dfn> is a Local-network accessible URL endpoint that a <a>user
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        agent</a> generates and maintains for receiving HTTP NOTIFY requests from UPnP Event sources. It is only
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        required when the user agent implements UPnP Service Discovery as defined in this specification.
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      </p>
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      <p>
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        In this specification we use the following terms to describe the processes required for Local-networked
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        Services management:
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      </p>
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      <ul>
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        <li>A <dfn>new service</dfn> is a Local-networked Service that has not previously been discovered or registered
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        in the <a>list of available service records</a>.
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        </li>
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        <li>An <dfn>existing service</dfn> is a Local-networked Service that has previously been discovered and is
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        registered in the <a>list of available service records</a>.
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        </li>
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        <li>A <dfn>current service</dfn> is a Local-networked Service, represented by a <a href=
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        "#networkservice"><code>NetworkService</code></a> object, that is currently being shared with a web page via a
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        <a href="#networkservices"><code>NetworkServices</code></a> object registered in the <a>list of active service
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        managers</a>.
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        </li>
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      </ul>
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    </section>
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    <section>
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      <h2>
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        Requesting networked services
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      </h2>
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      <pre class="widl">
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[Supplemental, NoInterfaceObject]
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interface <dfn id="navigatornetworkservice">NavigatorNetworkService</dfn> {
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  // Obtain a Local-networked Service
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  void <a href="#dom-navigator-getnetworkservices">getNetworkServices</a>( in any type,
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                           in <a href=
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"#navigatornetworkservicesuccesscallback">NavigatorNetworkServiceSuccessCallback</a> successCallback,
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                           in optional <a href=
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"#navigatornetworkserviceerrorcallback">NavigatorNetworkServiceErrorCallback</a> errorCallback );
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};
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<a class="externalDFN"
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     href=
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     "http://www.whatwg.org/specs/web-apps/current-work/complete/timers.html#navigator">Navigator</a> implements <a href=
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     "#navigatornetworkservice">NavigatorNetworkService</a>;
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[Callback=FunctionOnly, NoInterfaceObject]
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interface <dfn id="navigatornetworkservicesuccesscallback">NavigatorNetworkServiceSuccessCallback</dfn> {
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  void handleEvent( in <a href="#networkservices">NetworkServices</a> services );
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};
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[NoInterfaceObject]
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interface <dfn id="navigatornetworkserviceerror">NavigatorNetworkServiceError</dfn> {
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  const unsigned short <a href="#dom-navigatornetworkserviceerror-permission_denied">PERMISSION_DENIED_ERR</a> = 1;
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  const unsigned short <a href="#dom-navigatornetworkserviceerror-unknown_type_prefix">UNKNOWN_TYPE_PREFIX_ERR</a> = 2;
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  readonly attribute unsigned short <a href="#dom-navigatornetworkserviceerror-code">code</a>;
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};
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[Callback=FunctionOnly, NoInterfaceObject]
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interface <dfn id="navigatornetworkserviceerrorcallback">NavigatorNetworkServiceErrorCallback</dfn> {
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  void handleEvent( in <a href="#navigatornetworkserviceerror">NavigatorNetworkServiceError</a> error );
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};
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</pre>
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      <section>
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        <h2>
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          Methods
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        </h2>
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        <dl class="domintro">
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          <dt>
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            <var title="">window</var> . <code title="dom-navigator"><a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/timers.html#navigator">navigator</a></code> .
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            <code title="dom-navigator-getNetworkServices"><a href=
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            "#dom-navigator-getnetworkservices">getNetworkServices</a></code> ( <var title="">type</var> , <var title=
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            "">successCallback</var> [, <var title="">errorCallback</var> ] )
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          </dt>
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          <dd>
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            <p>
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              Prompts the user to select discovered network services that have advertised support for the requested
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              service type.
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            </p>
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            <p>
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              The <var title="">type</var> argument contains one or more <a>valid service type</a> tokens that the web
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              page would like to interact with.
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            </p>
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            <p>
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              If the user accepts, the <var title="">successCallback</var> is invoked, with zero or more <a href=
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              "#networkservice"><code>NetworkService</code></a> objects as its argument.
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            </p>
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            <p>
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              If the user declines, the <var title="">errorCallback</var> (if any) is invoked.
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            </p>
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          </dd>
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        </dl>
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        <div>
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          <p>
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            When the <dfn id="dom-navigator-getnetworkservices"
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               title="dom-navigator-getnetworkservices"><code>getNetworkServices(type, successCallback[,
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               errorCallback])</code></dfn> method is called, the <a>user agent</a> MUST run the following steps:
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          </p>
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          <ol class="rule">
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            <li>Let <var>requested control types</var> be initially set to an empty array.
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            </li>
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            <li>If <var>type</var> is an array consisting of one or more <a>valid service type</a> tokens, then let
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            <var>requested control types</var> by the value of <var>type</var>, removing any non-<a>valid service
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            type</a> tokens from the resulting array.
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            </li>
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            <li>If <var>type</var> is a string consisting of one <a>valid service type</a> token, then let
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            <var>requested control types</var> be an array containing one item with a value of <var>type</var>.
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            </li>
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            <li>If <var>requested control types</var> is an array that contains at least one or more <a title=
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            "valid service type">valid service type</a> tokens then continue to the step labeled <em>process</em>
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            below. Otherwise, the <a>user agent</a> MUST <a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                  class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                  object of type <code>Function</code>, with a new <a href=
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                  "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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                  "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 2
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                  (<a href=
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                  "#dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></a>) as
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                  its argument, abort any remaining steps and return.
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            </li>
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            <li>
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              <em>Process</em>: Let <var>services found</var> be an empty array.
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            </li>
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            <li>For each <var>available service</var> in the <a>list of available service records</a> run the following
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            steps:
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              <ol class="rule">
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                <li>For each <var>requested control type</var> in <var>requested control types</var>: If <var>available
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                service</var>'s <code>type</code> attribute equals the <var>requested control type</var> then let <var>
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                  matched service</var> equal the value of <var>available service</var> and continue at the step
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                  labeled <var>attach</var> below.
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                </li>
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                <li>Continue at the next <var>available service</var>.
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                </li>
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                <li>
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                  <em>Attach</em>: If <var>matched service</var> is not empty then run the following steps:
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                  <ol class="rule">
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                    <li>Let <var>new service object</var> be a new <a href=
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                    "#networkservice"><code>NetworkService</code></a> object, mapping the parameters of <var>matched
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                    service</var> to this new object where possible.
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                    </li>
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                    <li>Append <var>new service object</var> to the <var>services found</var> array.
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                    </li>
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                  </ol>
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                </li>
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              </ol>
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            </li>
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            <li>Return, and run the remaining steps asynchronously.
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            </li>
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            <li>Optionally, e.g. based on a previously-established user preference, for security reasons, or due to
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            platform limitations, the <a>user agent</a> MAY <a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                  class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                  object of type <code>Function</code>, with a new <a href=
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                  "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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                  "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 1
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                  (<a href=
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                  "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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                  argument, abort any remaining steps and return.
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            </li>
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            <li>The user agent MUST NOT provide the entry script's origin with a <a href=
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            "#networkservices"><code>NetworkServices</code></a> object without prior permission given by the user.
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              <p>
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                If <var>services found</var> is not an empty array then the <a>user agent</a> MAY choose to prompt the
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                user in a user-agent-specific manner for permission to provide the <a href=
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                "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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                   class="externalDFN">entry script</a>'s <a href=
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                   "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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                   class="externalDFN">origin</a> with a <a href="#networkservices"><code>NetworkServices</code></a>
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                   object representing the <a>user-authorized</a> subset of <var>services found</var>.
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              </p>
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              <p>
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                Alternatively, the user agent MAY choose to queue a task to invoke <var>successCallback</var> or
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                <var>errorCallback</var> immediately based on a previously-established user preference, for security
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                reasons, or due to platform limitations. In such an implementation, if <var>successCallback</var> is to
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                be fired as a result of a previously-established user preference then the <a>user agent</a> MUST
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                continue at the next step of this algorithm.
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              </p>
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              <p>
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                If permission has been granted by the user to access one or more networked services then the <a>user
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                agent</a> SHOULD include an "ongoing local-network communication" indicator.
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              </p>
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              <p>
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                If permission has been denied by the user, <a>user agent</a> or platform, then the <a>user agent</a>
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                MUST <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                   class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                   object of type <code>Function</code>, with a new <a href=
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                   "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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                   "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 1
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                   (<a href=
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                   "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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                   argument, abort any remaining steps and return.
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              </p>
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              <p>
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                If the user never responds or no previously-established user preference has been met, this algorithm
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                stalls on this step.
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              </p>
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            </li>
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            <li>Let <var>services</var> be an empty array.
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            </li>
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            <li>If <var>services found</var> is not an empty array then set <var>services</var> to be an array of one
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            or more <a href="#networkservice"><code>NetworkService</code></a> objects for which the user granted
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            permission above - known as the current objects <dfn>user-authorized</dfn> services.
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            </li>
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            <li>Remove all previously whitelisted urls from the <a>entry script origin's URL whitelist</a> granted in
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            the current <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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                  class="externalDFN">entry script</a>'s <a href=
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                  "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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                  class="externalDFN">origin</a>.
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            </li>
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            <li>For each Object <var>service</var> in <var>services</var>, if any, run the following sub-steps:
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              <ol class="rule">
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                <li>Add the <var>service</var>'s <code>url</code> parameter to the <a>entry script origin's
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                  <abbr title="Uniform Resource Locator">URL</abbr> whitelist</a>.
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                </li>
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                <li>If <var>service</var>'s <code>type</code> parameter begins with the DOMString "<code>upnp:</code>"
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                and the <var>service</var>'s <code>eventsUrl</code> parameter is not empty then <a>setup a UPnP Events
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                Subscription</a> for <var>service</var>.
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                </li>
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              </ol>
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            </li>
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            <li>Let <var>services manager</var> be a new <a href="#networkservices"><code>NetworkServices</code></a>
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            object.
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            </li>
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            <li>Store <var>requested control types</var> against <var>services manager</var> as an internal variable.
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            </li>
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            <li>Set <var>services manager</var>'s <a href=
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            "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute to the number of
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            items currently found in the <a>list of available service records</a> whose <code>type</code> property
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            matches any of the tokens requested in <var>requested control types</var>.
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            </li>
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   492
            <li>Add <var>services</var>, if any, to the <var>services manager</var> object as its collection of
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   493
            <a>indexed properties</a>. If <var>services</var> is an empty array then the <var>services manager</var>
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   494
            does not have any <var>indexed properties</var>.
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            </li>
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   496
            <li>Set <var>services manager</var>'s <a href="#dom-networkservices-length"><code>length</code></a>
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   497
            attribute to the number of items in <var>services</var>.
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   498
            </li>
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   499
            <li>Add <var>services manager</var> to the <a>list of active service managers</a>.
239
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   500
            </li>
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   501
            <li>The <a>user agent</a> MUST <a href=
239
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   502
            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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   503
                  class="externalDFN">queue a task</a> to invoke <var>successCallback</var> with <var>services
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   504
                  manager</var> as its argument.
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   505
            </li>
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   506
          </ol>
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   507
          <p>
239
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   508
            The <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#task-source"
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   509
               class="externalDFN">task source</a> for these <a href=
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   510
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#concept-task"
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   511
               class="externalDFN">tasks</a> is the <a href=
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   512
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#user-interaction-task-source"
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   513
               class="externalDFN">user interaction task source</a>.
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   514
          </p>
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   515
          <p>
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   516
            When a <a href="#networkservice"><code>NetworkService</code></a> object is provided to a Web page, the
250
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   517
            <a>user agent</a> MUST add the <code>url</code> property to the <dfn>entry script origin's URL
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   518
            whitelist</dfn>. This list enables the Web page to override and initiate cross-site resource requests
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   519
            towards these URLs, and any sub-resources of these URLs, within the current <a href=
239
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   520
            "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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   521
               class="externalDFN">entry script</a>'s <a href=
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   522
               "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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   523
               class="externalDFN">origin</a> via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
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   524
               Web Messaging, XMLHttpRequest).
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   525
          </p>
239
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   526
          <p>
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   527
            If the user navigates away from the <a href=
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   528
            "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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   529
               class="externalDFN">entry script</a>'s <a href=
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diff changeset
   530
               "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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   531
               class="externalDFN">origin</a> then the <a>user agent</a> <em class="ct">MUST</em> remove all previously
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   532
               whitelisted urls from the <a>entry script origin's URL whitelist</a>. There is no persistence to network
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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   533
               service selections provided to a web page. It is not possible to access a previously white-listed
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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   534
               networked service without the necessary user authorization in all of the following cases:
239
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diff changeset
   535
          </p>
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diff changeset
   536
          <ul>
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   537
            <li>If the current script is reloaded at any point in the same or different window.
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diff changeset
   538
            </li>
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   539
            <li>if the current script reinvokes the <a href=
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diff changeset
   540
            "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method at any point in its
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diff changeset
   541
            execution.
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diff changeset
   542
            </li>
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   543
            <li>If the user navigates forward or back in their history to reload the current page.
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diff changeset
   544
            </li>
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diff changeset
   545
            <li>If a script is running in a different origin.
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diff changeset
   546
            </li>
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diff changeset
   547
          </ul>
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diff changeset
   548
        </div>
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   549
      </section>
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   550
      <section>
239
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   551
        <h3>
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   552
          Error Handling
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   553
        </h3>
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diff changeset
   554
        <dl class="domintro">
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   555
          <dt>
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   556
            <var title="">error</var> . <code title="dom-NavigatorNetworkServiceError-code"><a href=
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   557
            "#dom-navigatornetworkserviceerror-code">code</a></code>
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diff changeset
   558
          </dt>
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   559
          <dd>
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diff changeset
   560
            <p>
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   561
              Returns the current error's error code. At the current time, this will be <code>1</code> or
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   562
              <code>2</code>, for which the corresponding error constants <a href=
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   563
              "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a> and <a href=
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   564
              "#dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></a> are
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   565
              defined.
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diff changeset
   566
            </p>
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   567
          </dd>
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   568
        </dl>
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diff changeset
   569
        <p>
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   570
          The <dfn id="dom-navigatornetworkserviceerror-code"
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   571
             title="dom-navigatornetworkserviceerror-code"><code>code</code></dfn> attribute of a <a href=
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diff changeset
   572
             "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object <em class=
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   573
             "ct">MUST</em> return the code for the error, which will be one of the following:
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diff changeset
   574
        </p>
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diff changeset
   575
        <dl>
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diff changeset
   576
          <dt>
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   577
            <dfn id="dom-navigatornetworkserviceerror-permission_denied"
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   578
                title="dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></dfn>
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   579
                (numeric value 1)
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diff changeset
   580
          </dt>
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diff changeset
   581
          <dd>
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   582
            The user or user agent denied the page permission to access any services.
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diff changeset
   583
          </dd>
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diff changeset
   584
          <dt>
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   585
            <dfn id="dom-navigatornetworkserviceerror-unknown_type_prefix"
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   586
                title="dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></dfn>
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diff changeset
   587
                (numeric value 2)
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diff changeset
   588
          </dt>
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diff changeset
   589
          <dd>
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diff changeset
   590
            No <a>valid service type</a> tokens were provided in the method invocation.
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diff changeset
   591
          </dd>
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diff changeset
   592
        </dl>
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diff changeset
   593
      </section>
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diff changeset
   594
    </section>
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diff changeset
   595
    <section>
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diff changeset
   596
      <h2>
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diff changeset
   597
        Obtaining networked services
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diff changeset
   598
      </h2>
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   599
      <p>
371
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diff changeset
   600
        The <a href="#networkservices"><code>NetworkServices</code></a> interface represents a collection of zero or
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diff changeset
   601
        more <dfn>indexed properties</dfn> that are each a <a>user-authorized</a> <a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   602
        "#networkservice"><code>NetworkService</code></a> object.
254
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diff changeset
   603
      </p>
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diff changeset
   604
      <p>
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diff changeset
   605
        A <a href="#networkservices"><code>NetworkServices</code></a> object is the top level success callback
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   606
        parameter from a call to <a href="#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a>.
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   607
      </p>
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   608
      <pre class="widl">
180
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   609
[NoInterfaceObject]
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   610
interface <dfn id="networkservices">NetworkServices</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   611
  readonly attribute unsigned long    <a href="#dom-networkservices-length">length</a>;
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   612
  getter <a href="#networkservice">NetworkService</a> (unsigned long index);
239
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   613
  <a href="#networkservice">NetworkService</a>? <a href=
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   614
"#dom-networkservices-getservicebyid">getServiceById</a>(DOMString id);
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   615
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   616
  readonly attribute unsigned long    <a href="#dom-networkservices-servicesavailable">servicesAvailable</a>;
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   617
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   618
  // event handler attributes
239
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   619
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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     class="externalDFN">EventHandler</a>     <a href="#dom-networkservices-onserviceavailable">onserviceavailable</a>;
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           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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   622
     class="externalDFN">EventHandler</a>     <a href=
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     "#dom-networkservices-onserviceunavailable">onserviceunavailable</a>;
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diff changeset
   624
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   625
};
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diff changeset
   626
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   627
<a href="#networkservices">NetworkServices</a> implements <a href=
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   628
"http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-eventtarget"
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   629
     class="externalDFN">EventTarget</a>;
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   630
</pre>
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7d43f1efc56f Move informative text introducing NSD events to Introduction section
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diff changeset
   631
180
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   632
      <section>
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   633
        <h2>
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   634
          Attributes
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   635
        </h2>
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   636
        <dl class="domintro">
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   637
          <dt>
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   638
            <code title="dom-networkservices-length"><a href="#dom-networkservices-length">length</a></code>
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   639
          </dt>
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diff changeset
   640
          <dd>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   641
            <p>
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   642
              Returns the current number of <a>indexed properties</a> in the current object's collection.
180
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   643
            </p>
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diff changeset
   644
          </dd>
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   645
          <dt>
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   646
            <code title="dom-networkservices-servicesavailable"><a href=
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   647
            "#dom-networkservices-servicesavailable">servicesAvailable</a></code>
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   648
          </dt>
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diff changeset
   649
          <dd>
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   650
            <p>
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   651
              Returns the current number of items matching one of the app-requested <a>valid service type</a> tokens in
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   652
              the <a>list of available service records</a>.
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   653
            </p>
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   654
          </dd>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   655
        </dl>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   656
        <div>
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   657
          <p>
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   658
            The <dfn id="dom-networkservices-length"><code>length</code></dfn> attribute MUST return the number of
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   659
            <a href="#networkservice"><code>NetworkService</code></a> objects represented by the collection.
180
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   660
          </p>
239
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   661
          <p>
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   662
            The <dfn id="dom-networkservices-servicesavailable"><code>servicesAvailable</code></dfn> attribute MUST
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   663
            return the number of services in the <a>list of available service records</a> whose <code>type</code>
398
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diff changeset
   664
            attribute matches any of the <a>valid service type</a> tokens that were initially used to create the current
250
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   665
            <a href="#networkservices"><code>NetworkServices</code></a> object.
239
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   666
          </p>
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diff changeset
   667
        </div>
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   668
      </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   669
      <section>
239
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diff changeset
   670
        <h2>
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diff changeset
   671
          Methods
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diff changeset
   672
        </h2>
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diff changeset
   673
        <dl class="domintro">
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diff changeset
   674
          <dt>
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   675
            <code title="networkservices-getter"><a href="#networkservices">services</a></code> [ <var title=
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diff changeset
   676
            "">index</var> ]
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diff changeset
   677
          </dt>
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diff changeset
   678
          <dd>
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diff changeset
   679
            <p>
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   680
              Returns the specified <a href="#networkservice"><code>NetworkService</code></a> object.
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diff changeset
   681
            </p>
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diff changeset
   682
          </dd>
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diff changeset
   683
          <dt>
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   684
            <code title="networkservices-getter"><a href="#networkservices">services</a></code> . <code title=
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diff changeset
   685
            "dom-networkservices-getservicebyid"><a href=
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diff changeset
   686
            "#dom-networkservices-getservicebyid">getServiceById</a></code> ( <var title="">id</var> )
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diff changeset
   687
          </dt>
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diff changeset
   688
          <dd>
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diff changeset
   689
            <p>
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diff changeset
   690
              Returns the <a href="#networkservice"><code>NetworkService</code></a> object with the given identifier,
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diff changeset
   691
              or null if no service has that identifier.
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diff changeset
   692
            </p>
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diff changeset
   693
          </dd>
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diff changeset
   694
        </dl>
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diff changeset
   695
        <p>
371
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diff changeset
   696
          A <a href="#networkservices"><code>NetworkServices</code></a> object represents the current collection of
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   697
          zero or more <a href="#networkservice"><code>NetworkService</code></a> objects - its <a>indexed
388
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   698
          properties</a>. The <a>indexed properties</a> of a <a href=
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   699
          "#networkservices"><code>NetworkServices</code></a> object are <span>immutable</span> meaning that <a>indexed
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   700
          properties</a> cannot be added and <a>indexed properties</a> cannot be removed for the lifetime of a <a href=
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
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diff changeset
   701
          "#networkservices"><code>NetworkServices</code></a> object.
239
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diff changeset
   702
        </p>
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diff changeset
   703
        <p>
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diff changeset
   704
          The <a href=
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diff changeset
   705
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#supported-property-indices"
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diff changeset
   706
             class="externalDFN">supported property indices</a> of <a href=
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diff changeset
   707
             "#networkservices"><code>NetworkServices</code></a> objects at any instant are the numbers from zero to
250
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diff changeset
   708
             the number of the <a href="#networkservice"><code>NetworkService</code></a> objects in the collection
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   709
             minus one.
239
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diff changeset
   710
        </p>
398
19eb703af1c9 Minor editorial changes to NSD spec
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parents: 397
diff changeset
   711
        <p class="note">
19eb703af1c9 Minor editorial changes to NSD spec
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parents: 397
diff changeset
   712
          Each service in a <a href="#networkservices"><code>NetworkServices</code></a> object thus has an index; the
19eb703af1c9 Minor editorial changes to NSD spec
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parents: 397
diff changeset
   713
          first has the index 0, and each subsequent service is numbered one higher than the previous one.
19eb703af1c9 Minor editorial changes to NSD spec
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parents: 397
diff changeset
   714
        </p>
239
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diff changeset
   715
        <p>
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diff changeset
   716
          To <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   717
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#determine-the-value-of-an-indexed-property"
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diff changeset
   718
             class="externalDFN">determine the value of an indexed property</a> for a given index <var>index</var> in a
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   719
             <a href="#networkservices"><code>NetworkServices</code></a> object the user agent MUST return the <a href=
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diff changeset
   720
             "#networkservice"><code>NetworkService</code></a> object that represents the <var>index</var>th item in
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   721
             the collection.
239
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diff changeset
   722
        </p>
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diff changeset
   723
        <p>
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diff changeset
   724
          The <dfn id="dom-networkservices-getservicebyid"><code>getServiceById(id)</code></dfn> method <em class=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   725
          "ct">MUST</em> return the first <a href="#networkservice"><code>NetworkService</code></a> object in the
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   726
          collection whose <a href="#dom-networkservice-id"><code>id</code></a> attribute is equal to the value of the
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          <var>id</var> argument provided. When no <a href="#networkservice"><code>NetworkService</code></a> objects
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   728
          match the given argument, the method MUST return null.
239
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   729
        </p>
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      </section>
239
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   731
      <section>
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   732
        <h2>
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   733
          Events
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   734
        </h2>
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        <p>
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          The following are the event handlers (and their corresponding event handler event types) that <em class=
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          "ct">MUST</em> be supported, as IDL attributes, by all objects implementing the <a href=
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          "#networkservices"><code>NetworkServices</code></a> interface:
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   739
        </p>
243
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   740
        <table border="1">
239
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   741
          <thead>
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   742
            <tr>
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   743
              <th>
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                <span title="event handlers">Event handler</span>
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   745
              </th>
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   746
              <th>
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   747
                <span>Event handler event type</span>
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   748
              </th>
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   749
            </tr>
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   750
          </thead>
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   751
          <tbody>
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   752
            <tr>
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   753
              <td>
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   754
                <dfn id="dom-networkservices-onserviceavailable"
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                    title="dom-NetworkServices-onserviceavailable"><code>onserviceavailable</code></dfn>
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   756
              </td>
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   757
              <td>
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   758
                <a href="#event-serviceavailable"><code>serviceavailable</code></a>
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   759
              </td>
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   760
            </tr>
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   761
            <tr>
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   762
              <td>
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   763
                <dfn id="dom-networkservices-onserviceunavailable"
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   764
                    title="dom-NetworkServices-onserviceunavailable"><code>onserviceunavailable</code></dfn>
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   765
              </td>
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   766
              <td>
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   767
                <a href="#event-serviceunavailable"><code>serviceunavailable</code></a>
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   768
              </td>
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diff changeset
   769
            </tr>
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diff changeset
   770
          </tbody>
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   771
        </table>
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diff changeset
   772
      </section>
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   773
    </section>
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diff changeset
   774
    <section>
239
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   775
      <h2>
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   776
        Communicating with a networked service
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diff changeset
   777
      </h2>
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diff changeset
   778
      <p>
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   779
        The <a href="#networkservice"><code>NetworkService</code></a> interface is used to provide a set of connection
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   780
        information for an HTTP service endpoint and if available, service events, running on a networked device.
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diff changeset
   781
      </p>
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diff changeset
   782
      <pre class="widl">
180
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diff changeset
   783
[NoInterfaceObject]
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   784
interface <dfn id="networkservice">NetworkService</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   785
  readonly attribute DOMString        <a href="#dom-networkservice-id">id</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   786
  readonly attribute DOMString        <a href="#dom-networkservice-name">name</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   787
  readonly attribute DOMString        <a href="#dom-networkservice-type">type</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   788
  readonly attribute DOMString        <a href="#dom-networkservice-url">url</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   789
  readonly attribute DOMString        <a href="#dom-networkservice-config">config</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   790
191
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diff changeset
   791
  readonly attribute boolean          <a href="#dom-networkservice-online">online</a>;
180
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parents:
diff changeset
   792
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   793
  // event handler attributes
239
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diff changeset
   794
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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diff changeset
   795
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onserviceonline">onserviceonline</a>;
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diff changeset
   796
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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diff changeset
   797
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onserviceoffline">onserviceoffline</a>;
191
5e0da09685f7 Discovery API updates following feedback from http://lists.w3.org/Archives/Public/public-device-apis/2012Aug/0016.html
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diff changeset
   798
239
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diff changeset
   799
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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diff changeset
   800
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onnotify">onnotify</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   801
};
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   802
239
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diff changeset
   803
<a href="#networkservice">NetworkService</a> implements <a href=
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diff changeset
   804
"http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-eventtarget"
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diff changeset
   805
     class="externalDFN">EventTarget</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   806
</pre>
239
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diff changeset
   807
      <section>
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diff changeset
   808
        <h2>
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diff changeset
   809
          Attributes
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diff changeset
   810
        </h2>
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diff changeset
   811
        <dl class="domintro">
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diff changeset
   812
          <dt>
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diff changeset
   813
            <var title="">service</var> . <code title="dom-networkservice-id"><a href=
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diff changeset
   814
            "#dom-networkservice-id">id</a></code>
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diff changeset
   815
          </dt>
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diff changeset
   816
          <dd>
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diff changeset
   817
            <p>
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diff changeset
   818
              A unique identifier for the given user-selected service instance.
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diff changeset
   819
            </p>
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diff changeset
   820
          </dd>
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diff changeset
   821
          <dt>
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   822
            <var title="">service</var> . <code title="dom-networkservice-name"><a href=
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diff changeset
   823
            "#dom-networkservice-name">name</a></code>
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diff changeset
   824
          </dt>
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diff changeset
   825
          <dd>
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diff changeset
   826
            <p>
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diff changeset
   827
              The name of the user-selected service.
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diff changeset
   828
            </p>
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diff changeset
   829
          </dd>
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diff changeset
   830
          <dt>
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   831
            <var title="">service</var> . <code title="dom-networkservice-type"><a href=
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diff changeset
   832
            "#dom-networkservice-type">type</a></code>
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diff changeset
   833
          </dt>
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diff changeset
   834
          <dd>
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diff changeset
   835
            <p>
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   836
              The <a>valid service type</a> token value of the user-selected service.
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diff changeset
   837
            </p>
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diff changeset
   838
          </dd>
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diff changeset
   839
          <dt>
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diff changeset
   840
            <var title="">service</var> . <code title="dom-networkservice-url"><a href=
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diff changeset
   841
            "#dom-networkservice-url">url</a></code>
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parents: 238
diff changeset
   842
          </dt>
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diff changeset
   843
          <dd>
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diff changeset
   844
            <p>
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diff changeset
   845
              The control URL endpoint (including any required port information) of the user-selected control service
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diff changeset
   846
              that has been added to the <a>entry script origin's URL whitelist</a>.
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parents: 238
diff changeset
   847
            </p>
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diff changeset
   848
          </dd>
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diff changeset
   849
          <dt>
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diff changeset
   850
            <var title="">service</var> . <code title="dom-networkservice-config"><a href=
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diff changeset
   851
            "#dom-networkservice-config">config</a></code>
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parents: 238
diff changeset
   852
          </dt>
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parents: 238
diff changeset
   853
          <dd>
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parents: 238
diff changeset
   854
            <p>
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diff changeset
   855
              The configuration information associated with the service depending on the requested service type.
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parents: 238
diff changeset
   856
            </p>
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diff changeset
   857
          </dd>
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diff changeset
   858
        </dl>
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parents: 238
diff changeset
   859
        <p>
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parents: 238
diff changeset
   860
          The <dfn id="dom-networkservice-id"><code>id</code></dfn> attribute is a unique identifier for the service.
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   861
          The same service provided at different times or on different objects MUST have the same <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   862
          "#dom-networkservice-id"><code>id</code></a> value.
239
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parents: 238
diff changeset
   863
        </p>
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parents: 238
diff changeset
   864
        <p>
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parents: 238
diff changeset
   865
          The <dfn id="dom-networkservice-name"><code>name</code></dfn> attribute represents a human-readable title for
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   866
          the service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   867
        </p>
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   868
        <p>
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   869
          The <dfn id="dom-networkservice-type"><code>type</code></dfn> attribute reflects the value of the <a>valid
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parents: 238
diff changeset
   870
          service type</a> of the service.
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parents: 238
diff changeset
   871
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   872
        <p>
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parents: 238
diff changeset
   873
          The <dfn id="dom-networkservice-url"><code>url</code></dfn> attribute is an <a href=
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   874
          "http://www.w3.org/TR/html5/urls.html#absolute-url"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   875
             class="externalDFN">absolute URL</a> pointing to the root HTTP endpoint for the service that has been
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   876
             added to the <a>entry script origin's URL whitelist</a>. Web pages can subsequently use this value for
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   877
             implicit cross-document messaging via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
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parents: 238
diff changeset
   878
             Web Messaging, XMLHttpRequest).
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   879
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   880
        <p>
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   881
          The <dfn id="dom-networkservice-config"><code>config</code></dfn> attribute provides the raw configuration
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parents: 238
diff changeset
   882
          information extracted from the given network service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   883
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   884
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   885
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   886
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   887
          States
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   888
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   889
        <dl class="domintro">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   890
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   891
            <var title="">service</var> . <code title="dom-networkservice-online"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   892
            "#dom-networkservice-online">online</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   893
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   894
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   895
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   896
              Returns <code>true</code> if the service is reporting that it is accessible on the local network or
390
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   897
              <code>false</code> if the service is no longer accessible (temporarily or permanently) on the local
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   898
              network.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   899
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   900
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   901
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   902
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   903
          The <dfn id="dom-networkservice-online"><code>online</code></dfn> attribute indicates whether the service is
390
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   904
          either <var>online</var>, and therefore accessible on the local network, in which case this attribute will
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   905
          return <code>true</code> or, <var>offline</var>, and therefore not accessible on the local network, either
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   906
          temporarily or permanently, in which case this attribute will return <code>false</code>. This attribute MUST
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
   907
          default to <code>true</code>.
239
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parents: 238
diff changeset
   908
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   909
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   910
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   911
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   912
          Events
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   913
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   914
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   915
          The following are the event handlers (and their corresponding event handler event types) that <em class=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   916
          "ct">MUST</em> be supported, as IDL attributes, by all objects implementing the <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   917
          "#networkservice"><code>NetworkService</code></a> interface:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   918
        </p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
   919
        <table border="1">
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   920
          <thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   921
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   922
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   923
                <span title="event handlers">Event handler</span>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   924
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   925
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   926
                <span>Event handler event type</span>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   927
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   928
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   929
          </thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   930
          <tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   931
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   932
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   933
                <dfn id="dom-networkservice-onnotify"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   934
                    title="dom-NetworkService-onnotify"><code>onnotify</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   935
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   936
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   937
                <a href="#event-notify"><code>notify</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   938
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   939
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   940
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   941
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   942
                <dfn id="dom-networkservice-onserviceonline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   943
                    title="dom-NetworkService-onserviceonline"><code>onserviceonline</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   944
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   945
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   946
                <a href="#event-serviceonline"><code>serviceonline</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   947
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   948
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   949
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   950
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   951
                <dfn id="dom-networkservice-onserviceoffline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   952
                    title="dom-NetworkService-onserviceoffline"><code>onserviceoffline</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   953
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   954
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   955
                <a href="#event-serviceoffline"><code>serviceoffline</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   956
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   957
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   958
          </tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   959
        </table>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   960
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   961
    </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   962
    <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   963
      <h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   964
        Service Discovery
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   965
      </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   966
      <p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
   967
        A <a>user agent</a> conforming to this specification MAY implement <abbr title=
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   968
        "Simple Service Discovery Protocol">SSDP</abbr> [[!UPNP-DEVICEARCH11]], Zeroconf [[!DNS-SD]] + [[!MDNS]] and/or
371
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   969
        <abbr title="Discovery and Launch Protocol">DIAL</abbr> [<a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   970
        "https://sites.google.com/a/dial-multiscreen.org/dial/dial-protocol-specification">DIAL</a>] <dfn>service
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   971
        discovery mechanisms</dfn> - the requirements detailed in this section of the specification - to enable Web
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   972
        pages to request and connect with HTTP services running on networked devices, discovered via any of these
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   973
        mechanisms, through this API. When a <a>user agent</a> implements any of these <a>service discovery
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   974
        mechanisms</a>, then it MUST conform to the corresponding algorithms provided in this section of the
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   975
        specification.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   976
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   977
      <p>
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   978
        This section presents how the results of these <a>service discovery mechanisms</a> will be matched to requested
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   979
        service types, how the user agent stores available and active services and how their properties are applied to
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
   980
        any resulting <a href="#networkservice"><code>NetworkService</code></a> objects.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   981
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   982
      <p>
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   983
        It is expected that user agents will perform these <a>service discovery mechanisms</a> asynchronously and
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   984
        periodically update the <a>list of available service records</a> as required. The timing of any <a>service
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   985
        discovery mechanisms</a> is an implementation detail left to the discretion of the implementer (e.g. by
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   986
        continuously monitoring the network as a background process or on invocation of this API from a Web page).
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   987
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   988
      <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   989
        The <dfn>list of available service records</dfn> is a single dynamic internal lookup table within user agents
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   990
        that is used to track all the services that have been discovered and are available in the current network at
372
7639401e21f4 Allow SSDP service discovery request to issue an ST header equal to 'ssdp:all', 'upnp:rootdevice' or urn:schemas-upnp-org:service:serviceType:ver
Rich Tibbett <richt@opera.com>
parents: 371
diff changeset
   991
        the current time. At any point during the running of either of the two <a>service discovery mechanisms</a> then
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   992
        existing entries within this table can be updated, entries can be added and entries can be removed as the
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   993
        status of networked services changes according to the rules defined in this specification.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   994
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   995
      <p>
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   996
        The <dfn>list of active service managers</dfn> is an internal list within user agents that is used to track all
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   997
        <a href="#networkservices"><code>NetworkServices</code></a> objects currently being shared with any web pages
371
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   998
        at the current time within the user agent. Each <a href="#networkservices"><code>NetworkServices</code></a>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   999
        object in the <a>list of active service managers</a> represents a collection of zero or more <a href=
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1000
        "#networkservice"><code>NetworkService</code></a> objects - known as its <dfn>indexed properties</dfn>.
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1001
        <a href="#networkservice"><code>NetworkService</code></a> objects are attached as the <a>indexed properties</a>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1002
        of a <a href="#networkservices"><code>NetworkServices</code></a> object as part of the <a href=
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1003
        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> algorithm.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1004
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1005
      <p>
387
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1006
        The rule for <dfn>adding an available service</dfn> is the process of adding a <a>new service</a> or updating
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1007
        an <a>existing service</a> that is generally available on the user's current network in the <a>list of
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1008
        available service records</a>. This rule takes one argument, <var>network service record</var>, and consists of
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1009
        running the following steps:
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1010
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1011
      <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1012
        <li>For each <var>existing service record</var> in the current <a>list of available service records</a>, run
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1013
        the following sub-steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1014
          <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1015
            <li>If the <var>existing service record</var>'s <code>id</code> property does not equal <var>network
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1016
            service record</var>'s <code>id</code> property then abort any remaining sub-steps and continue at the next
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1017
            available <var>existing service record</var>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1018
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1019
            <li>Replace the value of <var>existing service record</var> in the current <a>list of available service
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1020
            records</a> with the value of <var>network service record</var>, aborting any remaining steps in this
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1021
            algorithm and return.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1022
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1023
          </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1024
        </li>
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1025
        <li>Add <var>network service record</var> to the <a>list of available service records</a> as a new item.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1026
        </li>
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1027
        <li>For each <var>service manager</var> in the <a>list of active service managers</a> run the following steps:
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1028
          <ol class="rule">
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1029
            <li>For each <var>active service</var> in <var>service manager</var> run the following steps:
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1030
              <ol class="rule">
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1031
                <li>If the <var>network service record</var>'s <code>id</code> property equals the <var>active
392
38bf34c08d76 Only set online to true if it was previously false in Step 3.1.1 of the rule for 'adding an available service'.
Rich Tibbett <richt@opera.com>
parents: 391
diff changeset
  1032
                service</var>'s <code>id</code> attribute and <var>active service</var>'s <code>online</code> attribute
38bf34c08d76 Only set online to true if it was previously false in Step 3.1.1 of the rule for 'adding an available service'.
Rich Tibbett <richt@opera.com>
parents: 391
diff changeset
  1033
                is currently set to <code>false</code> then set <var>active service</var>'s <a href=
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1034
                "#dom-networkservice-online"><code>online</code></a> attribute to <code>true</code> and then <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1035
                "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1036
                      class="externalDFN">queue a task</a> to dispatch a newly created event with the name <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1037
                      "#event-serviceonline"><code>serviceonline</code></a> that uses the <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1038
                      "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1039
                      class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not cancellable,
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1040
                      and has no default action, at the current <var>active service</var> object.
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1041
                </li>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1042
              </ol>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1043
            </li>
375
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1044
            <li>Let <var>'service type in current service manager' flag</var> be <code>false</code>.
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1045
            </li>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1046
            <li>For each <var>requested control type</var> of the <var>requested control types</var> in <var>service
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1047
            manager</var> run the following steps:
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1048
              <ol class="rule">
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1049
                <li>If <var>network service record</var>'s <code>type</code> property does not equal <var>requested
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1050
                control type</var> then abort any remaining sub-steps and continue at the next available <var>requested
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1051
                control type</var>.
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1052
                </li>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1053
                <li>Set the <var>'service type in current service manager' flag</var> to <code>true</code>, abort any
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1054
                remaining sub-steps and continue.
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1055
                </li>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1056
              </ol>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1057
            </li>
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1058
            <li>If the <var>'service type in current service manager' flag</var> is set to <code>true</code> then
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1059
            increment <var>service manager</var>'s <a href=
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1060
            "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute by <code>1</code> and
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1061
            then <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1062
                  class="externalDFN">queue a task</a> to dispatch a newly created event with the name <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1063
                  "#event-serviceavailable"><code>serviceavailable</code></a> that uses the <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1064
                  "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1065
                  class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not cancellable, and
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1066
                  has no default action, at the current <var>service manager</var> object.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1067
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1068
          </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1069
        </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1070
      </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1071
      <p>
387
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1072
        The rule for <dfn>removing an available service</dfn> is the general process of removing an <a>existing
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1073
        service</a> from the <a>list of available service records</a> that has left the user's current network or has
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1074
        otherwise expired. This rule takes one argument, <var>service identifier</var>, and consists of running the
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
Rich Tibbett <richt@opera.com>
parents: 378
diff changeset
  1075
        following steps:
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1076
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1077
      <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1078
        <li>For each <var>existing service record</var> in the current <a>list of available service records</a>, run
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1079
        the following sub-steps:
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diff changeset
  1080
          <ol class="rule">
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diff changeset
  1081
            <li>If the <var>existing service record</var>'s <code>id</code> property does not match <var>service
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diff changeset
  1082
            identifier</var> then skip any remaining sub-steps for the current <var>existing service record</var> and
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parents: 238
diff changeset
  1083
            continue at the next available <var>existing service record</var>.
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parents: 238
diff changeset
  1084
            </li>
378
89d1cef16d35 Only remove UPnP Events subscription once it is no longer in use by any active services
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parents: 377
diff changeset
  1085
            <li>Let <var>'service type in use' flag</var> be <code>false</code>.
239
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diff changeset
  1086
            </li>
250
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diff changeset
  1087
            <li>For each <var>service manager</var> in the <a>list of active service managers</a> run the following
239
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parents: 238
diff changeset
  1088
            steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
  1089
              <ol class="rule">
373
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parents: 372
diff changeset
  1090
                <li>Let <var>'service type in current service manager' flag</var> be <code>false</code>.
239
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diff changeset
  1091
                </li>
250
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diff changeset
  1092
                <li>For each <var>active service</var> in <var>service manager</var> run the following steps:
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
  1093
                  <ol class="rule">
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diff changeset
  1094
                    <li>If <var>existing service record</var>'s <code>id</code> property equals the <var>active
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
  1095
                    service</var>'s <code>id</code> attribute and <var>active service</var>'s <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
  1096
                    "#dom-networkservice-online"><code>online</code></a> attribute is currently set to
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
  1097
                    <code>true</code> then set <var>active service</var>'s <a href="#dom-networkservice-online"><code>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
  1098
                      online</code></a> attribute to <code>false</code> and then <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
  1099
                      "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
  1100
                          class="externalDFN">queue a task</a> to dispatch a newly created event with the name <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
  1101
                          "#event-serviceoffline"><code>serviceoffline</code></a> that uses the <a href=
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diff changeset
  1102
                          "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
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diff changeset
  1103
                          class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not
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diff changeset
  1104
                          cancellable, and has no default action, at the current <var>active service</var>.
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diff changeset
  1105
                    </li>
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diff changeset
  1106
                  </ol>
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diff changeset
  1107
                </li>
375
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1108
                <li>For each <var>requested control type</var> of the <var>requested control types</var> in
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1109
                <var>service manager</var> run the following steps:
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1110
                  <ol class="rule">
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1111
                    <li>If <var>existing service record</var>'s <code>type</code> property does not equal
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1112
                    <var>requested control type</var> then abort any remaining sub-steps and continue at the next
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1113
                    available <var>requested control type</var>.
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1114
                    </li>
378
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Rich Tibbett <richt@opera.com>
parents: 377
diff changeset
  1115
                    <li>Set the <var>'service type in current service manager' flag</var> to <code>true</code> and the
89d1cef16d35 Only remove UPnP Events subscription once it is no longer in use by any active services
Rich Tibbett <richt@opera.com>
parents: 377
diff changeset
  1116
                    <var>'service type in use' flag</var> to <code>true</code>, abort any remaining sub-steps and
89d1cef16d35 Only remove UPnP Events subscription once it is no longer in use by any active services
Rich Tibbett <richt@opera.com>
parents: 377
diff changeset
  1117
                    continue.
375
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1118
                    </li>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1119
                  </ol>
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
  1120
                </li>
373
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diff changeset
  1121
                <li>If the <var>'service type in current service manager' flag</var> is set to <code>true</code> then
250
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  1122
                decrement <var>service manager</var>'s <a href=
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diff changeset
  1123
                "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute by <code>1</code>
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diff changeset
  1124
                and then <a href=
239
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diff changeset
  1125
                "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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diff changeset
  1126
                      class="externalDFN">queue a task</a> to dispatch a newly created event with the name <a href=
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