activemq-flow: bug fixes in BrokerDatabase and KahaDBStore
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                 Key: AMQ-2189
                 URL: https://issues.apache.org/activemq/browse/AMQ-2189
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: incubation
         Environment: N/A
            Reporter: Colin MacNaughton
             Fix For: incubation
         Attachments: AMQ-2189patch.txt

The attached fix resolves a problem in KahaDBStore.KahaDBSession in which 
addMessage() wasn't using the caller supplied message key but instead allocated 
a new key. Without using the user supplied key, subsequent deletes would not 
properly delete the message. Also fixed corresponding test cases to provide a 
message key when adding messages. 

Also made some fixes to synchronization and delayed event processing in 
BrokerDatabase. The resulting code is not as performant in swimlanes testing, 
and should be optimized in the future (the problem is too many threads 
synchronizing on the opQueue is causing a lot of contention). 

Finally added some miscellaneous fixes to OpenwireProtocolHandler and the test 
drivers to avoid/detect duplicate messageIds. 

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