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From "James Strachan (JIRA)" <>
Subject [jira] Updated: (AMQ-1920) MessageAvailableListener doesn't work with prefetchSize set to zero
Date Fri, 29 Aug 2008 12:26:52 GMT


James Strachan updated AMQ-1920:

    Priority: Minor  (was: Critical)

downgraded from critical as this discusses a rare-case optimisation to try avoid using a blocking
thread when using zero prefetch - an easy workaround is to use prefetch of 1 or just use a
blocking thread with prefetch of zero

> MessageAvailableListener doesn't work with prefetchSize set to zero
> -------------------------------------------------------------------
>                 Key: AMQ-1920
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 4.1.1, 5.1.0
>         Environment: Broker running ActiveMQ 4.1.1
> Client/Consumer tested with AMQ 4.1.1 and 5.1.0
>            Reporter: Sebastian Riedel
>            Priority: Minor
>             Fix For: 4.1.1, 5.1.0
> The MessageAvailableListener doesn't trigger his event, when prefetchSize is set to zero,
although messages are in queue (but because of prefetchSize = zero not dispatched). I understand
why the complete asynchronous MessageListener is not allowed to be used with prefetchSize
of zero, but in my opinion the AvailableListener should work.
> Since there is no other possibilty to check for the availability of a new message ( the
Queuebrowser is for this aim to slow, because it produces massive traffic) this is a critical
issue in my case, also because i can't use JMX to determine e.g. the  QueueSize to trigger
a MessageAvailableEvent myself.

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