[jboss-jira] [JBoss JIRA] Created: (JBMESSAGING-1081) Allow configuration of distribution policy for queues with multiple consumers

[Julian Scheid (JIRA)]

Allow configuration of distribution policy for queues with multiple consumers
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                 Key: JBMESSAGING-1081
                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-1081
             Project: JBoss Messaging
          Issue Type: Feature Request
          Components: Messaging Core
    Affects Versions: 1.4.0 CR3
            Reporter: Julian Scheid
         Assigned To: Tim Fox
            Priority: Minor


The distribution policy for queues is currently hardwired to RoundRobinDistributor (in MessagingQueue.java) like this:

   	localDistributor = new DistributorWrapper(new RoundRobinDistributor());   	
   	remoteDistributor = new DistributorWrapper(new RoundRobinDistributor());   	
   	distributor = new ClusterRoundRobinDistributor(localDistributor, remoteDistributor); 

This is a good default for when multiple clients are consuming a queue for purposes of load balancing. However, when there are multiple consumers for purposes of fail-over it can be desirable to use the FirstReceiverDistributor policy instead so that a second consumer only gets messages when the first consumer fails. (I am aware that this is simplifying matters a bit, FirstReceiverDistributor makes no such guarantees.)

This policy can currently only be changed by patching the source code and recompiling. It would be great if it would be possible to configure the distribution policy in a configuration file instead, ideally on a per-queue basis in destinations-service.xml.

This would ideally allow specifying arbitrary class names so that it's possible to install custom distributors.

All of this would obviously be useful for topics as well once JBMESSAGING-377 is implemented.


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