ackequivexample.java

JMS的例子程序

                        System.out.println("SUBSCRIBER: Processing message: " 
                                           + msg.getText());
                    } catch (JMSException e) {
                        System.out.println("Exception in onMessage(): " 
                                           + e.toString());
                    } 
                } else {
                    monitor.allDone();
                }
            }
        }

        /**
         * Runs the thread.
         */
        public void run() {
            TopicConnectionFactory  topicConnectionFactory = null;
            TopicConnection         topicConnection = null;
            TopicSession            topicSession = null;
            Topic                   topic = null;
            TopicSubscriber         topicSubscriber = null;
            TextListener            topicListener = null;

            try {
                topicConnectionFactory = 
                    SampleUtilities.getTopicConnectionFactory();
                topicConnection = 
                    topicConnectionFactory.createTopicConnection();
                topicConnection.setClientID("AckEquivExample");
                topicSession = topicConnection.createTopicSession(false, 
                    Session.AUTO_ACKNOWLEDGE);
                System.out.println("SUBSCRIBER: Created auto-acknowledge session");
                topic = SampleUtilities.getTopic(topicName, topicSession);
            } catch (Exception e) {
                System.out.println("Connection problem: " + e.toString());
                if (topicConnection != null) {
                    try {
                        topicConnection.close();
                    } catch (JMSException ee) {}
                }
    	        System.exit(1);
            }
            
            /*
             * Create auto-acknowledge subscriber.
             * Register message listener (TextListener).
             * Start message delivery.
             * Send synchronize message to publisher, then wait till all
             *   messages have arrived.
             * Listener displays the messages obtained.
             */
            try {
                topicSubscriber = topicSession.createDurableSubscriber(topic,
                     "AckEquivExampleSubscription");
                topicListener = new TextListener();
                topicSubscriber.setMessageListener(topicListener);
                topicConnection.start();

                // Let publisher know that subscriber is ready.
                try {
                    SampleUtilities.sendSynchronizeMessage("SUBSCRIBER: ", 
                                                            CONTROL_QUEUE);
                } catch (Exception e) {
                    System.out.println("Queue probably missing: " + e.toString());
                    if (topicConnection != null) {
                        try {
                            topicConnection.close();
                        } catch (JMSException ee) {}
                    }
    	            System.exit(1);
    	        }

                /*
                 * Asynchronously process messages.
                 * Block until publisher issues a control message indicating
                 * end of publish stream.
                 */
                topicListener.monitor.waitTillDone();
                topicSubscriber.close();
                topicSession.unsubscribe("AckEquivExampleSubscription");
            } catch (JMSException e) {
                System.out.println("Exception occurred: " + e.toString());
                exitResult = 1;
            } finally {
                if (topicConnection != null) {
                    try {
                        topicConnection.close();
                    } catch (JMSException e) {
                        exitResult = 1;
                    }
                }
            }
        }	    
    }

    /**
     * The MultiplePublisher class creates a session in AUTO_ACKNOWLEDGE mode
     * and publishes three messages to a topic. 
     *
     * @author Kim Haase
     * @version 1.6, 08/18/00
     */
    public class MultiplePublisher extends Thread {
        
        /**
         * Runs the thread.
         */
        public void run() {
            TopicConnectionFactory  topicConnectionFactory = null;
            TopicConnection         topicConnection = null;
            TopicSession            topicSession = null;
            Topic                   topic = null;
            TopicPublisher          topicPublisher = null;
            TextMessage             message = null;
            final int               NUMMSGS = 3;
            final String            MSG_TEXT = 
                              new String("Here is an auto-acknowledge message");

            try {
                topicConnectionFactory = 
                    SampleUtilities.getTopicConnectionFactory();
                topicConnection = 
                    topicConnectionFactory.createTopicConnection();
                topicSession = topicConnection.createTopicSession(false, 
                    Session.AUTO_ACKNOWLEDGE);
                System.out.println("PUBLISHER: Created auto-acknowledge session");
                topic = SampleUtilities.getTopic(topicName, topicSession);
            } catch (Exception e) {
                System.out.println("Connection problem: " + e.toString());
                if (topicConnection != null) {
                    try {
                        topicConnection.close();
                    } catch (JMSException ee) {}
                }
    	        System.exit(1);
            }

            /*
             * After synchronizing with subscriber, create publisher.
             * Send 3 messages, varying text slightly.
             * Send end-of-messages message.
             */
            try {
                /*
                 * Synchronize with subscriber.  Wait for message indicating 
                 * that subscriber is ready to receive messages.
                 */
                try {
                    SampleUtilities.receiveSynchronizeMessages("PUBLISHER: ", 
                                                              CONTROL_QUEUE, 1);
                } catch (Exception e) {
                    System.out.println("Queue probably missing: " + e.toString());
                    if (topicConnection != null) {
                        try {
                            topicConnection.close();
                        } catch (JMSException ee) {}
                    }
    	            System.exit(1);
    	        }

                topicPublisher = topicSession.createPublisher(topic);
                message = topicSession.createTextMessage();
                for (int i = 0; i < NUMMSGS; i++) {
                    message.setText(MSG_TEXT + " " + (i + 1));
                    System.out.println("PUBLISHER: Publishing message: " 
                        + message.getText());
                    topicPublisher.publish(message);
                }
                
                // Send a non-text control message indicating end of messages. 
                topicPublisher.publish(topicSession.createMessage());
            } catch (JMSException e) {
                System.out.println("Exception occurred: " + e.toString());
                exitResult = 1;
            } finally {
                if (topicConnection != null) {
                    try {
                        topicConnection.close();
                    } catch (JMSException e) {
                        exitResult = 1;
                    }
                }
            }
        }
    }
    
    /**
     * Instantiates the sender, receiver, subscriber, and publisher classes and 
     * starts their threads.
     * Calls the join method to wait for the threads to die.
     */
    public void run_threads() {
        SynchSender        synchSender = new SynchSender();
        SynchReceiver      synchReceiver = new SynchReceiver();
        AsynchSubscriber   asynchSubscriber = new AsynchSubscriber();
        MultiplePublisher  multiplePublisher = new MultiplePublisher();
        
        synchSender.start();
        synchReceiver.start();
        try {
            synchSender.join();
            synchReceiver.join();
        } catch (InterruptedException e) {}

        asynchSubscriber.start();
        multiplePublisher.start();
        try {
            asynchSubscriber.join();
            multiplePublisher.join();
        } catch (InterruptedException e) {}
    }

    /**
     * Reads the queue and topic names from the command line, then calls the
     * run_threads method to execute the program threads.
     *
     * @param args	the topic used by the example
     */
    public static void main(String[] args) {
        AckEquivExample  aee = new AckEquivExample();
        
        if (args.length != 2) {
    	    System.out.println("Usage: java AckEquivExample <queue_name> <topic_name>");
    	    System.exit(1);
    	}
        aee.queueName = new String(args[0]);
        aee.topicName = new String(args[1]);
        System.out.println("Queue name is " + aee.queueName);
        System.out.println("Topic name is " + aee.topicName);

    	aee.run_threads();
    	SampleUtilities.exit(aee.exitResult);
    }
}