[Java Broker] Implement Message Grouping
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Key: QPID-3720
URL: https://issues.apache.org/jira/browse/QPID-3720
Project: Qpid
Issue Type: Improvement
Components: Java Broker
Reporter: Rob Godfrey
Assignee: Rob Godfrey
Implement message grouping on the Java Broker (similar in style to that
implemented in the C++ broker in QPID-3346)
In contrast to the C++ implementation
1) Once a group has been assigned to a subscription, assign all further
messages from the same group to the same group (whether or not all prior
messages in the group have been acknowledged)
2) Message grouping is allowed on priority queues, Conflation Queues (and
Sorted Queues). (However it has no effect on browsers... which means if you
using a ConflationQueue as an LVQ by browsing it you cannot use groups).
3) Allow for non string values for the group header
4) Setting the qpid.shared_msg_group argument is not required on queue
construction (whether grouping is enforced or not depends on whether the
qpid.group_header_key argument is non-null).
Note that in general 1) is stricter than the condition that is enforced by the
C++ broker - however in the case where a client cancels a subscription without
first releasing/acknowledging all outstanding messages that have been delivered
then you can get "out of order".
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