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From "Rob Godfrey (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Created: (QPID-2321) [Java Broker] Add "conflation queue" to Java Broker
Date Tue, 05 Jan 2010 12:12:54 GMT
[Java Broker] Add "conflation queue" to Java Broker
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                 Key: QPID-2321
                 URL: https://issues.apache.org/jira/browse/QPID-2321
             Project: Qpid
          Issue Type: New Feature
          Components: Java Broker
    Affects Versions: 0.7
            Reporter: Rob Godfrey
             Fix For: 0.7


Conflation queues replace messages with new one as they arrive if the two messages share the
same key value

A conflation queue is created if you specify a <conflationKey> in the XML configuration;
or provide a value for x-qpid-conflation-key in the arguments to the Queue.Declare command.

A queue thus created will check incoming messages as they come in for the value in the application
headers associated with the given conflationKey.  Any message with the same conflation key
value which has not yet been dequeued will be dequeued immediately as the new message is inserted
into the queue.

Using a non-acquiring consumer (i.e. browsing) one can use a conflation queue as an LVQ which
also sends updates as new values are inserted/updated.

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