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From "Timothy Bish (Closed) (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (AMQ-3641) ActiveMQMessageConsumer dispatches messages while holding mutex
Date Tue, 03 Jan 2012 14:07:39 GMT

     [ https://issues.apache.org/jira/browse/AMQ-3641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Timothy Bish closed AMQ-3641.
-----------------------------

    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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