Robbie Gemmell created QPIDJMS-112:
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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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