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From "james strachan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-723) Generate Advisory Messages to setup tear down producer based on consumer activity
Date Tue, 25 Jul 2006 11:18:23 GMT
     [ https://issues.apache.org/activemq/browse/AMQ-723?page=all ]

james strachan resolved AMQ-723.
--------------------------------

    Resolution: Fixed

I think this is now resolved by just using the aforementioned selector (consumerCount=0) on
the subscription to consumer advisories

> Generate Advisory Messages to setup tear down producer based on consumer activity
> ---------------------------------------------------------------------------------
>
>                 Key: AMQ-723
>                 URL: https://issues.apache.org/activemq/browse/AMQ-723
>             Project: ActiveMQ
>          Issue Type: New Feature
>          Components: Broker
>    Affects Versions: 4.0
>            Reporter: Kyle Himmerick
>             Fix For: 4.1
>
>   Original Estimate: 30 minutes
>  Remaining Estimate: 30 minutes
>
> Use Case is a custom producer is setup for each topic and should be shut down when there
are no subscribers left.
> With the getConsumerAdvisoryTopic I can receive messages when a specific subscriber joins
or leaves.  So I can figure out if a consumer is the first, but it would be nice to receive
a separate message here.
> Currently there is nothing that generates advisory messages when there are no subscribers
left.  The getNoTopicConsumersAdvisoryTopic() only fires when a message is sent to a topic
with no consumers, like dead letter queue.  A separate advisory message should be fired when
the last subscriber leaves.  Ideally we could set a delay for this advisory message, so it
could fire if the ConsumerCount remained at 0 for x msec/min.  This would prevent unnecessary
tear down/setup of the producer.

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