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Date: Wed, 24 May 2006 14:53:51 +0000 (GMT+00:00)
From: "Kyle Himmerick (JIRA)" <jira@apache.org>
To: activemq-dev@geronimo.apache.org
Subject: [jira] Created: (AMQ-723) Generate Advisory Messages to setup tear
 down producer based on consumer activity
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Generate Advisory Messages to setup tear down producer based on consumer activity
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         Key: AMQ-723
         URL: https://issues.apache.org/activemq/browse/AMQ-723
     Project: ActiveMQ
        Type: New Feature

  Components: Broker  
    Versions: 4.0    
    Reporter: Kyle Himmerick
     Fix For: 4.1


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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