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Posted to dev@activemq.apache.org by "Tin Tvrtković (Created JIRA)" <ji...@apache.org> on 2011/12/20 11:17:30 UTC

[jira] [Created] (AMQ-3641) ActiveMQMessageConsumer dispatches messages while holding mutex

ActiveMQMessageConsumer dispatches messages while holding mutex
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                 Key: AMQ-3641
                 URL: https://issues.apache.org/jira/browse/AMQ-3641
             Project: ActiveMQ
          Issue Type: Bug
          Components: JMS client
    Affects Versions: 5.5.1
         Environment: CentOS 5, Sun Java 1.6 64-bit, server mode
            Reporter: Tin Tvrtković


I'm using async message dispatch.

I've noticed the ActiveMQMessageConsumer class dispatches messages to its listeners while holding a mutex (method name: dispatch(MessageDispatch md), mutex name unconsumedMessages). This mutex needs to be grabbed in other situations as well (like closing the connection), which can lead to deadlocks. Is this really the best way of handling this?

I realize I can get around this problem in a number of ways, but this issue seems to be pretty deep in the client infrastructure, especially if another JMS framework is being used (like Spring JMS).

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[jira] [Closed] (AMQ-3641) ActiveMQMessageConsumer dispatches messages while holding mutex

Posted by "Timothy Bish (Closed) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/AMQ-3641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timothy Bish closed AMQ-3641.
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    Resolution: Not A Problem

This is working as designed.  If you can show a test case where this is causing some issue please reopen and attach it here. 
                
> ActiveMQMessageConsumer dispatches messages while holding mutex
> ---------------------------------------------------------------
>
>                 Key: AMQ-3641
>                 URL: https://issues.apache.org/jira/browse/AMQ-3641
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JMS client
>    Affects Versions: 5.5.1
>         Environment: CentOS 5, Sun Java 1.6 64-bit, server mode
>            Reporter: Tin Tvrtković
>              Labels: concurrency, deadlock, mutex
>
> I'm using async message dispatch.
> I've noticed the ActiveMQMessageConsumer class dispatches messages to its listeners while holding a mutex (method name: dispatch(MessageDispatch md), mutex name unconsumedMessages). This mutex needs to be grabbed in other situations as well (like closing the connection), which can lead to deadlocks. Is this really the best way of handling this?
> I realize I can get around this problem in a number of ways, but this issue seems to be pretty deep in the client infrastructure, especially if another JMS framework is being used (like Spring JMS).

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