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From "james strachan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-930) Session 'consumers' hashtable susceptible to invalid operation exception
Date Mon, 25 Sep 2006 06:55:23 GMT
     [ https://issues.apache.org/activemq/browse/AMQ-930?page=all ]

james strachan resolved AMQ-930.
--------------------------------

    Fix Version/s: 4.1
       Resolution: Fixed

Patch applied to ensure consumers.Values is thread safe to fix the issue

> Session 'consumers' hashtable susceptible to invalid operation exception
> ------------------------------------------------------------------------
>
>                 Key: AMQ-930
>                 URL: https://issues.apache.org/activemq/browse/AMQ-930
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: NMS (C# client)
>    Affects Versions: incubation
>         Environment: Windows XP, NMS API running against a AMQ 4.0.2 provider
>            Reporter: Bryan Schmidt
>             Fix For: 4.1
>
>
> In a multithreaded environment that reuses the Session object, the following exception
is thrown:
> Invalid operation exception with the text: "Collection was modified; enumeration operation
may not execute."
> The exception is thrown when iterating through Session's consumers.Values collection.
 It appears that the lock is being ignored.  Spinning up a new thread fixes the problem:
> --- Session.cs, DispatchAsyncMessages method ---
>         public void DispatchAsyncMessages(object state)
>         {
>             // lets iterate through each consumer created by this session
>             // ensuring that they have all pending messages dispatched
>             lock (this)
>             {
>                 // lets ensure that only 1 thread dispatches messages in a consumer at
once
>                 foreach (MessageConsumer consumer in consumers.Values)
>                 {
>                     ThreadPool.QueueUserWorkItem(new WaitCallback(consumer.DispatchAsyncMessages));
>                 }
>             }
>         }

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