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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@3098 4b5297f7-1745-476d-ba37-a9c6900126ab
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Peter Saint-Andre 2009-04-28 02:14:26 +00:00
parent af00b482d7
commit b19c1fd7f9
1 changed files with 2 additions and 2 deletions
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xep-0237.xml
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@ -125,7 +125,7 @@ C: <iq from='romeo@montague.lit/home' id='r1h3vzp7' to='romeo@montague.lit' type
<p>Naturally, if the client does not support roster versioning or does not wish to bootstrap the use of roster versioning, it will behave like an RFC-3921-compliant client by not including the 'ver' attribute.</p>
</section2>
<section2 topic='Server Response' anchor='response-result'>
<p>Whether or not the roster has been modified since the version ID enumerated by the client, the server MUST either return the complete roster as described in RFC 3921 or return an empty IQ-result (thus indicating that any roster modifications will be sent via roster pushes, as described below). In general, unless returning the complete roster would use less bandwidth than sending individual roster pushes to the client (e.g., if the roster contains only a few items), the server SHOULD send an empty IQ-result and then send the modifications (if any) via roster pushes. In addition, if the client signals a version ID that is different from the version currently on file at the server for that JID, the server MUST return the whole current roster as if client announced its version to be the empty string, thus bootstrapping the client's local cache.</p>
<p>Whether or not the roster has been modified since the version ID enumerated by the client, the server MUST either return the complete roster as described in RFC 3921 or return an empty IQ-result (thus indicating that any roster modifications will be sent via roster pushes, as described below). In general, unless returning the complete roster would (1) use less bandwidth than sending individual roster pushes to the client (e.g., if the roster contains only a few items) or (2) the server cannot associate the version ID with any previous version it has on file, the server SHOULD send an empty IQ-result and then send the modifications (if any) via roster pushes.</p>
<example caption="Empty roster result"><![CDATA[
S: <iq from='romeo@montague.lit' id='r1h3vzp7' to='romeo@montague.lit/home' type='result'/>
]]></example>
@ -164,7 +164,7 @@ S: <iq from='romeo@montague.lit' id='dh361f35' to='romeo@montague.lit/home' type
<p>These "interim roster pushes" can be understood as follows:</p>
<ol>
<li>Imagine that the client had an active presence session for the entire time between its cached roster version (say, "qAxdnWNcA+lYf7CoN5wpBsvVVno=") and the new roster version (say, "/gAR2erxkF5xLkRGaHJziC7B3LE=").</li>
<li>During that time, the client might have received roster pushes related to varous roster versions. However, some of those roster pushes might have contained intermediate updates to the same roster item (e.g., modifications to the subscription state for bill@shakespeare.lit from "none" to "to" and from "to" to "both").</li>
<li>During that time, the client might have received roster pushes related to various roster versions. However, some of those roster pushes might have contained intermediate updates to the same roster item (e.g., modifications to the subscription state for bill@shakespeare.lit from "none" to "to" and from "to" to "both").</li>
<li>The interim roster pushes would not include all of the intermediate steps, only the final result of all modifications applied to each item while the client was in fact offline (say, "qAxdnWNcA+lYf7CoN5wpBsvVVno=", "18sl3M/tdcyd1mwtn1hKmKOnacE=", "kkmqpuunFM5obGuZLN9ZgyKEVSs=", and "/gAR2erxkF5xLkRGaHJziC7B3LE=").</li>
</ol>
<p>The client MUST handle an "interim roster push" in the same way it handles any roster push (indeed, from the client's perspective it cannot tell the difference between an "interim" roster push and a "live" roster push). If the client's session ends before it receives all of the interim roster pushes, when requesting the roster after reconnection it SHOULD request the version associated with the last roster <em>push</em> it received during the session that was disconnected, not the version associated with the roster <em>result</em> it received at the start of the session that was disconnected.</p>