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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4225) PooledConnectionFactory should track Session checkouts and close associated resources
Date Mon, 17 Dec 2012 14:34:51 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533950#comment-13533950
] 

Timothy Bish commented on AMQ-4225:
-----------------------------------

First thing you should do is create some unit tests, otherwise any fix can break at any time
without warning. 
                
> PooledConnectionFactory should track Session checkouts and close associated resources
> -------------------------------------------------------------------------------------
>
>                 Key: AMQ-4225
>                 URL: https://issues.apache.org/jira/browse/AMQ-4225
>             Project: ActiveMQ
>          Issue Type: Improvement
>    Affects Versions: 5.7.0
>            Reporter: Raul Kripalani
>
> When the user's code closes a Connection checked out from the pool, I would expect activemq-pool
to close Sessions, MessageConsumers and MessageProducers that were created from it. 
> Unfortunately, activemq-pool only cleans up Sessions on Connection.close() when no one
else is referencing the Connection (referenceCount == 0). 
> This makes Sessions, Consumers and Producers outlive the code that actually uses them,
thus leading to increased resource consumption and messages being trapped in prefetch buffers
that are no longer monitored.
> Instead, we should keep track of the Sessions that were created from each specific Connection
checkout, and close them when the borrowed Connection is closed.
> Otherwise we bump into situations like [SPR-10092|https://jira.springsource.org/browse/SPR-10092]
when using Spring's DefaultMessageListenerContainer. In some cases DMLC "forgets" to explicitly
close MessageConsumers and Sessions, even though Connections are always closed, but the pool
doesn't take care of cleaning up associated sessions.

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