Examples of javax.jms.TopicPublisher

javax.jms.TopicPublisher
A client uses a TopicPublisher object to publish messages on a topic. A TopicPublisher object is the publish-subscribe form of a message producer.
Normally, the Topic is specified when a TopicPublisher is created. In this case, an attempt to use the publish methods for an unidentified TopicPublisher will throw a java.lang.UnsupportedOperationException.
If the TopicPublisher is created with an unidentified Topic, an attempt to use the publish methods that assume that the Topic has been identified will throw a java.lang.UnsupportedOperationException.
During the execution of its publish method, a message must not be changed by other threads within the client. If the message is modified, the result of the publish is undefined.
After publishing a message, a client may retain and modify it without affecting the message that has been published. The same message object may be published multiple times.
The following message headers are set as part of publishing a message: JMSDestination, JMSDeliveryMode, JMSExpiration, JMSPriority, JMSMessageID and JMSTimeStamp. When the message is published, the values of these headers are ignored. After completion of the publish, the headers hold the values specified by the method publishing the message. It is possible for the publish method not to set JMSMessageID and JMSTimeStamp if the setting of these headers is explicitly disabled by the MessageProducer.setDisableMessageID or MessageProducer.setDisableMessageTimestamp method.
Creating a MessageProducer provides the same features as creating a TopicPublisher. A MessageProducer object is recommended when creating new code. The TopicPublisher is provided to support existing code.
Because TopicPublisher inherits from MessageProducer, it inherits the send methods that are a part of the MessageProducer interface. Using the send methods will have the same effect as using the publish methods: they are functionally the same. @see Session#createProducer(Destination) @see TopicSession#createPublisher(Topic)

            {


               TopicSession session = topicConnection.createTopicSession(true, Session.AUTO_ACKNOWLEDGE);
               Topic topic = (Topic) context.lookup(TEST_TOPIC);


               TopicPublisher publisher = session.createPublisher(topic);


               BytesMessage message = session.createBytesMessage();
               message.writeBytes(PAYLOAD);
               message.setStringProperty("TEST_NAME", "runTopicSendRollback");
               message.setIntProperty("TEST_PERSISTENCE", persistence);
               message.setBooleanProperty("TEST_EXPLICIT", explicit);


               for (int i = 0; i < iterationCount; i++)
               {
                  publisher.publish(message, persistence, 4, 0);
               }


               session.close();
            }
            catch (Exception e)

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            {


               TopicSession session = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
               Topic topic = (Topic) context.lookup(TEST_TOPIC);


               TopicPublisher publisher = session.createPublisher(topic);


               waitForSynchMessage();


               BytesMessage message = session.createBytesMessage();
               message.writeBytes(PAYLOAD);
               message.setStringProperty("TEST_NAME", "runAsynchTopicReceiveRollback");
               message.setIntProperty("TEST_PERSISTENCE", persistence);
               message.setBooleanProperty("TEST_EXPLICIT", explicit);


               for (int i = 0; i < iterationCount; i++)
               {
                  publisher.publish(message, persistence, 4, 0);
                  log.debug("Published message " + i);
               }


               session.close();
            }

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            {


               TopicSession session = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
               Topic topic = (Topic) context.lookup(TEST_DURABLE_TOPIC);


               TopicPublisher publisher = session.createPublisher(topic);


               waitForSynchMessage();


               BytesMessage message = session.createBytesMessage();
               message.writeBytes(PAYLOAD);
               message.setStringProperty("TEST_NAME", "runAsynchDurableTopicReceiveRollback");
               message.setIntProperty("TEST_PERSISTENCE", persistence);
               message.setBooleanProperty("TEST_EXPLICIT", explicit);


               for (int i = 0; i < iterationCount; i++)
               {
                  publisher.publish(message, persistence, 4, 0);
                  log.debug("Published message " + i);
               }


               session.close();
            }

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               {


                  TopicSession session = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
                  Topic topic = (Topic)context.lookup(TEST_TOPIC);


                  TopicPublisher publisher = session.createPublisher(topic);


                  waitForSynchMessage();


                  BytesMessage message = session.createBytesMessage();
                  message.writeBytes(PAYLOAD);


                  for (int i = 0; i < iterationCount; i++)
                  {
                     publisher.publish(message, persistence, 4, 0);
                  }


                  session.close();
               }
               catch (Exception e)

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               {


                  TopicSession session = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
                  Topic topic = (Topic)context.lookup(TEST_DURABLE_TOPIC);


                  TopicPublisher publisher = session.createPublisher(topic);


                  waitForSynchMessage();


                  BytesMessage message = session.createBytesMessage();
                  message.writeBytes(PAYLOAD);


                  for (int i = 0; i < iterationCount; i++)
                  {
                     publisher.publish(message, persistence, 4, 0);
                  }


                  session.close();
               }
               catch (Exception e)

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            QueueSession qsession = queueConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
            TemporaryQueue temp = qsession.createTemporaryQueue();
            message.setJMSReplyTo(temp);


            TopicPublisher publisher = session.createPublisher(topic);
            publisher.publish(message);


            QueueReceiver receiver = qsession.createReceiver(temp);
            if (receiver.receive(2000) == null)
            {
               state.addError(new Exception("Didn't receive message"));

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      try
      {
         TopicSession session = getTopicSession();
         if (trace)
            log.trace("createPublisher " + session + " topic=" + topic);
         TopicPublisher result = session.createPublisher(topic);
         result = new JmsTopicPublisher(result, this);
         if (trace)
            log.trace("createdPublisher " + session + " publisher=" + result);
         addProducer(result);
         return result;

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            connection = fact.createTopicConnection();


            Topic topic = (Topic) namingContext.lookup("topic/metrics");
            TopicSession session = connection.createTopicSession(IS_TRANSACTED, ACKNOWLEDGE_MODE);
            TopicPublisher pub = session.createPublisher(topic);


            pub.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
            pub.setPriority(Message.DEFAULT_PRIORITY);
            pub.setTimeToLive(Message.DEFAULT_TIME_TO_LIVE);


            // start the JMS connection
            connection.start();


            // copy the message queue every x seconds, and publish the messages
            while (running)
            {


               Object[] array;
               long sleepTime = delay;


               try
               {
                  Thread.sleep(sleepTime);


                  // measure message processing cost and try to deal
                  // with congestion
                  long begin = System.currentTimeMillis();


                  // synchronized during the copy... the interceptor will
                  // have to wait til done
                  synchronized (msgQueue)
                  {
                     array = msgQueue.toArray();
                     msgQueue.clear();
                  }


                  // publish the messages
                  for (int i = 0; i < array.length; ++i)
                  {
                     Message msg = createMessage(session,
                           ((Entry) array[i]).principal,
                           ((Entry) array[i]).id,
                           ((Entry) array[i]).method,
                           ((Entry) array[i]).checkpoint,
                           ((Entry) array[i]).time
                     );


                     pub.publish(msg);
                  }


                  // try to deal with congestion a little better, alot of
                  // small messages fast will kill JBossMQ performance, this is
                  // a temp fix to group many messages into one operation

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      getLog().debug("Starting InvaidDestinationTopicPublish test");
      connect();


      TopicSession session = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
      TemporaryTopic topic = session.createTemporaryTopic();
      TopicPublisher publisher = session.createPublisher(topic);
      topic.delete();


      TextMessage message = session.createTextMessage("hello");
      boolean caught = false;
      try
      {
         publisher.publish(message);
      }
      catch (InvalidDestinationException expected)
      {
         caught = true;
      }

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      TopicSubscriber sub1 = session.createDurableSubscriber(topic, "sub1");
      TopicSubscriber sub2 = session.createSubscriber(topic);
      TopicSubscriber sub3 = session.createSubscriber(topic);


      //Now a sender
      TopicPublisher sender = session.createPublisher(topic);


      //send some messages
      sender.publish(session.createTextMessage("Message 1"));
      sender.publish(session.createTextMessage("Message 2"));
      sender.publish(session.createTextMessage("Message 3"));
      drainMessagesForTopic(sub1);
      drainMessagesForTopic(sub2);
      drainMessagesForTopic(sub3);


      //close some subscribers
      sub1.close();
      sub2.close();


      //send some more messages
      sender.publish(session.createTextMessage("Message 4"));
      sender.publish(session.createTextMessage("Message 5"));
      sender.publish(session.createTextMessage("Message 6"));


      //give time for message 4 to be negatively acked (as it will be cause last receive timed out)
      try
      {
         Thread.sleep(5 * 1000);
      }
      catch (InterruptedException e)
      {
      }


      drainMessagesForTopic(sub3);


      //open subscribers again.
      sub1 = session.createDurableSubscriber(topic, "sub1");
      sub2 = session.createSubscriber(topic);


      //Send a final message
      sender.publish(session.createTextMessage("Final message"));
      sender.close();


      drainMessagesForTopic(sub1);
      drainMessagesForTopic(sub2);
      drainMessagesForTopic(sub3);

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