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From "Robbie Gemmell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPIDJMS-112) have receiveNoWait and receive(timeout) drain credit to ensure no message is available
Date Fri, 18 Sep 2015 16:06:05 GMT
Robbie Gemmell created QPIDJMS-112:
--------------------------------------

             Summary: have receiveNoWait and receive(timeout) drain credit to ensure no message
is available
                 Key: QPIDJMS-112
                 URL: https://issues.apache.org/jira/browse/QPIDJMS-112
             Project: Qpid JMS
          Issue Type: Improvement
          Components: qpid-jms-client
    Affects Versions: 0.5.0
            Reporter: Robbie Gemmell
            Assignee: Robbie Gemmell
             Fix For: 0.6.0


As of QPIDJMS-92, if the consumer has been configured to have no prefetch, the client will
issue and drain a single credit before inspecting its local message queue, ensuring that any
available message sent by a broker will be returned to the application. However, if the client
has prefetch, the consumer credit is granted and never drained, which means that a recieveNoWait
call will only return a message if first given time to prefetch it, otherwise returning null
even where messages 'are available'.

The behaviour should be updated such that if no message is locally available when checked,
the credit is drained to ensure messages available on the broker are retrieved and given the
chance to be returned rather than returning null.

The same improvement can be applied to receive with a timeout to give behaviour many would
expect where messages 'are available', though it might additionally be useful if the drain
could be disabled in this case.



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