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Throttling JMS Ques in Spring

Posted on 2008-06-12
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Last Modified: 2008-06-17
I am developing an app that uses JMS ques in Spring. The app runs on a JBoss server. The ques are asynchronous and I am placing several messages on the que. The problem is I only want to process a couple of messages at a time. Does anyone know how I can set the que/listener so that only a few messages get sent to the listener, those messages get processed, then another couple of messages get sent to the listener and so on until Im out of messages?
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Question by:texastemplar
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manuel_m earned 500 total points
ID: 21773068
If you are using a listener to get the messages the listener will receive as many messages as he can get.
You have to receive the messages by your own.

manuel
final String YOUR_QUEUE = "queue/testQueue";
    Context         ctx      = null;
    QueueConnection connect  = null;
    QueueSession    session  = null;
    Queue           queue    = null;
    QueueReceiver   receiver = null;
    try {
      ctx = new InitialContext();
      QueueConnectionFactory fact = (QueueConnectionFactory)
                                    ctx.lookup( "ConnectionFactory" );
      connect = fact.createQueueConnection();
      session = connect.createQueueSession( false, Session.AUTO_ACKNOWLEDGE );
      try {
        queue = (Queue) ctx.lookup( YOUR_QUEUE );
      } catch( NameNotFoundException ex ) {
        queue = session.createQueue( YOUR_QUEUE );
        ctx.bind( YOUR_QUEUE, queue );
      }
      receiver = session.createReceiver( queue );
      connect.start();
      // get only 10 messages
      for( int i=0; i<10; i++ ) {
        // set timeout to 1000 ms per message
        TextMessage msg = (TextMessage) receiver.receive( 1000 );
        if( null != msg ) {
          System.out.println( msg.getText() );
          // acknowledge the message so it is out of the queue
          msg.acknowledge();
        }
      }        
    } finally {
      try { if( null != receiver ) receiver.close(); } catch( Exception ex ) {}
      try { if( null != session  ) session.close();  } catch( Exception ex ) {}
      try { if( null != connect  ) connect.close();  } catch( Exception ex ) {}
      try { if( null != ctx      ) ctx.close();      } catch( Exception ex ) {}
    }

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Author Comment

by:texastemplar
ID: 21780665
Im trying to slow down the queue so it doesnt send all of the messages to the receivers at once. Possibly a pause between each message or have the queue pass a certain number of messages, then pause, then pass more messages. Im also using Spring to interact with the queues. Can you throttle the queue using Spring? Im thinking that maybe there is a parameter I can place in the spring.xml config file to limit the speed that the queue passes messages. Perhaps there is some spring code I can use to slow things down?
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Expert Comment

by:manuel_m
ID: 21781725
The only thing I can point to are these websites. There is a configuration example in "19.6 JMS Namespace Support" before "Table 19.3. Attributes of the JMS <jca-listener-container/> element" where you can set a prefetch parameter. With this parameter the consumer prefetches the given number of messages and waits for acknowlege (if a TransactionManager is set).

http://static.springframework.org/spring/docs/2.5.x/reference/jms.html#jms-jca-message-endpoint-manager
http://static.springframework.org/spring/docs/2.5.x/reference/jms.html#jms-namespace

I hope this helps. Otherwise I see no possibility to slow things down with spring.

manuel
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Author Comment

by:texastemplar
ID: 21806858
I solved my problem. There is a parameter you can set in the messagelistener container defined in the spring xml file called concurrentConsumers. This limits the number of consumers. Then in each consumer use thread.sleep to slow its consumption of messages.
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