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    <p>The tibjmsadmin.jar library contains methods to detect when subscribers disconnect. Easier than writing code, you can:</p> <ul> <li>if you have Hawk, use the tibjmsadmin.hma to write a Hawk rule in the event a subscriber disconnects, or </li> <li>listen on the monitor topic $sys.monitor.connection.disconnect - the body of the message tells you which subscriber disconnected.</li> </ul> <p>However these "monitoring" approaches to failing over the publisher have a significant problem - in the time it takes for you to detect the subscriber failure and redirect the publisher, some messages may get through and get stuck in the defunct queue. You don't wat this happening to any $10M trades!</p> <p>EMS knows when subscribers are connected or not and you should take advantage of this.</p> <p>Use a "distributed queue" and there shouldn't be any need to code logic into your application to switch to a new subscriber when it fails. This happens without message loss and maintains the order of messages. It is also good architectural practice to keep load balancing and failover logic out of your code and in the administration setup of your JMS provider.</p> <p>Basically you setup multiple subscribers to a queue (each exchange represented by a subscriber). The default action will be for EMS to load-balance messages across your subscribers in a round-robin fashion. But you can set the queue to "exclusive" so that messages go to only one subscriber at a time. Then if that active subscriber fails, the messages are forwarded to another subscriber.</p> <p>See the EMS manual for more details on all these topics. </p>
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    1. COthanks for the answer.i will certainly check the documentation.
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