Chapter 8 Message Service Tuning

Shared listeners

In client applications, a shared listener can greatly improve performance for nondurable topic subscribers by creating a single message queue for all the topic subscriptions. To use this feature:

1. In EAServer Manager create a topic connection factory (or modify the one that you use already). Set the SHARED_LISTENER property to true.
2. In your code:
   
   
   1. Use this connection factory to create your topic subscriptions.
   2. Install a message listener on the first topic subscription, then each nondurable subscription that uses the connection, receives messages from this listener.

EAServer imposes two restrictions for shared listeners:

• Do not call setMessageListener with a null parameter. This shuts down the current listener, which may be in use by other subscribers.
• Do not call setMessageListener with the name of another listener, which shuts down the current listener and registers the new listener.

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