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These names are used by the application for lookup purposes. Much of this code is similar to the code used for sending messages in the publishand-subscribe model. Therefore, we only briefly describe the code. The constructor JmsClient() of the class JmsClient obtains the TopicConnectionFactory and Topic from the JNDI InitialContext. This context is created with vendor-specific properties. After this, the client application creates a TopicConnection and a TopicSession, as you have seen previously. Then a TopicSubscriber is created, which is designed specifically to process incoming messages that are published to its specified Topic. The TopicSubscriber can receive messages directly, or it can delegate the processing of the messages to a MessageListener. We have chosen to implement the MessageListener interface so that the JmsClient class can process messages itself. MessageListener implements a single method, onMessage(), which is invoked every time a new message is sent to a subscriber s topic.
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Listing 6-4
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Listing 6.4: A Java class for receiving a text message in a publish subscribe scenario 1 import javax.jms.Message; 2 import javax.jms.TextMessage; 3 import javax.jms.TopicConnectionFactory; 4 import javax.jms.TopicConnection; 5 import javax.jms.TopicSession; 6 import javax.jms.Topic; 7 import javax.jms.Session; 8 import javax.jms.TopicSubscriber; 9 import javax.jms.JMSException; 10 import javax.naming.InitialContext ; 11 12 public class JmsClient implements javax.jms.MessageListener { 13 14 public static void main (String [] args) throws Exception { 15 if ( args.length != 2 ) 16 throw new Exception ("Wrong number of arguments"); 17 new JmsClient ( args[0], args[1] ); 18 while (1) { Thread.sleep (20000); } 19 } 20 21 public JmsClient ( String factoryName, String topicName ) { 22 23 InitialContext jndiContext = getInitialContext (); 24 TopicConnectionFactory factory = (TopicConnectionFactory) 25 jndiContext.lookup (factoryName); 26 Topic topic = (Topic) jndiContext.lookup(topicName); 27 TopicConnection connect = factory.createTopicConnection (); 28 TopicSession session = 29 connect.createTopicSession (false,Session.AUTO_ ACKNOWLEDGE);
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30 TopicSubscriber subscriber = session.createSubscriber (topic); 31 subscriber.setMessageListner(this); 32 connect.start(); 33 } 34 35 public void onMessage (Message message) { 36 37 try { 38 TextMessage textMessage = (textMessage) message; 39 String text = textMessage.getText (); 40 System.out.println ("Message Received : \n" + text); 41 } 42 catch (JMSException ex) { 43 System.out.println (" JMS ERROR : " + ex.getMessage() ); 44 } 45 } 46 }
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Message-driven beans (MDBs) are stateless, server-side, transactionaware components for processing asynchronous messages. MDBs are part of J2EE components. MDBs provide significant advantages over traditional JMS clients, such as those described previously. One of the most important advantages is that MDBs can consume and process messages concurrently. The MDB containers manage concurrency automatically, so that the bean developer can focus on the business logic of processing the messages. The MDB can receive hundreds of messages from various applications and process them all at the same time, because a large number of instances of the MDB can execute concurrently in the container. Thus, they represent a very scalable solution for message processing. Although an MDB is a complete enterprise bean, there are important differences from entity and session beans. In particular, an MDB does not have component interfaces. The component interfaces are absent because a message-driven bean is not accessible via the Java RMI API. An MDB responds only to asynchronous messages. To provide a concrete example, we consider an MDB that just receives an asynchronous text message and prints it out on the standard output device. The code for this MDB is shown in Listing 6-5. We briefly describe the important parts of this code. The MDB class implements two interfaces. The javax.jms .MessageDrivenBean interface defines callback methods similar to those in entity and session beans. The two methods this interface contains are ejbRemove() and setMessageDrivenContext(), the latter of which is called at the beginning of the MDB s life cycle and provides the MDB instance with a reference to its MessageDrivenContext. The other
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