Fix Consumer message credit issues in 0-10 codepath
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Key: QPID-3602
URL: https://issues.apache.org/jira/browse/QPID-3602
Project: Qpid
Issue Type: Bug
Components: Java Client
Affects Versions: 0.14
Reporter: Rajith Attapattu
Assignee: Rajith Attapattu
Fix For: 0.15
Currently there are several issues related to message credits.
1. QPID-2604 - Getting more messages than required by the prefetch value.
2. If connection is started and stopped, the client *may* get more messages
than required by the prefetch value (no JIRA).
3. Prefetch=1 case doesn't work properly (QPID-3562).
4. Prefetch-0 case doesn't work properly (well completely broken).
5. Message credits are affected by Command Completions and not message-acks.
However these two are intertwined in the logic causing some issues. For example
when in client-ack mode or using transactions, if the client has exhausted the
credits, but is waiting for more messages to come before it acks or commits a
transaction, then the client will appear hung (This issue is currently masked
due to some of the above bugs).
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