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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