ackequivexample.java

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/*
 * Copyright (c) 2006 Sun Microsystems, Inc.  All rights reserved.  U.S.
 * Government Rights - Commercial software.  Government users are subject
 * to the Sun Microsystems, Inc. standard license agreement and
 * applicable provisions of the FAR and its supplements.  Use is subject
 * to license terms.
 *
 * This distribution may include materials developed by third parties.
 * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks
 * or registered trademarks of Sun Microsystems, Inc. in the U.S. and
 * other countries.
 *
 * Copyright (c) 2006 Sun Microsystems, Inc. Tous droits reserves.
 *
 * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
 * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de
 * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions
 * en vigueur de la FAR (Federal Acquisition Regulations) et des
 * supplements a celles-ci.  Distribue par des licences qui en
 * restreignent l'utilisation.
 *
 * Cette distribution peut comprendre des composants developpes par des
 * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE
 * sont des marques de fabrique ou des marques deposees de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */


import javax.jms.ConnectionFactory;
import javax.jms.Queue;
import javax.jms.Topic;
import javax.jms.Connection;
import javax.jms.Session;
import javax.jms.MessageProducer;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.JMSException;
import javax.annotation.Resource;


public class AckEquivExample {
    @Resource(mappedName = "jms/ConnectionFactory")
    private static ConnectionFactory connectionFactory;
    @Resource(mappedName = "jms/DurableConnectionFactory")
    private static ConnectionFactory durableConnectionFactory;
    @Resource(mappedName = "jms/ControlQueue")
    private static Queue controlQueue;
    @Resource(mappedName = "jms/Queue")
    private static Queue queue;
    @Resource(mappedName = "jms/Topic")
    private static Topic topic;
    final String CONTROL_QUEUE = "jms/ControlQueue";
    final String conFacName = "jms/DurableConnectionFactory";
    final String queueName = "jms/Queue";
    final String topicName = "jms/Topic";

    /**
     * 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) {
        }

        try {
            asynchSubscriber.start();
            Thread.sleep(1000);
            multiplePublisher.start();
        } catch (InterruptedException e) {
        }

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

    /**
     * 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 != 0) {
            System.out.println("Program takes no arguments.");
            System.exit(1);
        }

        System.out.println("Queue name is " + aee.CONTROL_QUEUE);
        System.out.println("Queue name is " + aee.queueName);
        System.out.println("Topic name is " + aee.topicName);
        System.out.println("Connection factory name is " + aee.conFacName);

        aee.run_threads();
        System.exit(0);
    }

    /**
     * The AsynchSubscriber class creates a session in
     * AUTO_ACKNOWLEDGE mode and fetches several messages from a
     * topic asynchronously, using a message listener,
     * TextListener.
     *
     * Each message is acknowledged after the onMessage method
     * completes.
     */
    public class AsynchSubscriber extends Thread {
        /**
         * Runs the thread.
         */
        public void run() {
            Connection connection = null;
            Session session = null;
            MessageConsumer subscriber = null;
            TextListener listener = null;

            try {
                connection = durableConnectionFactory.createConnection();
                session = connection.createSession(
                            false,
                            Session.AUTO_ACKNOWLEDGE);
                System.out.println(
                        "SUBSCRIBER: Created " + "auto-acknowledge session");
            } catch (Exception e) {
                System.err.println(
                        "Connection problem with subscriber: " + e.toString());

                if (connection != null) {
                    try {
                        connection.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 {
                subscriber = session.createDurableSubscriber(topic, "AckSub");
                listener = new TextListener();
                subscriber.setMessageListener(listener);
                connection.start();

                // Let publisher know that subscriber is ready.
                try {
                    SampleUtilities.sendSynchronizeMessage(
                            "SUBSCRIBER: ",
                            connectionFactory,
                            controlQueue);
                } catch (Exception e) {
                    System.err.println(
                            "Connection or queue problem with subscriber: "
                            + e.toString());
                    e.printStackTrace();

                    if (connection != null) {
                        try {
                            connection.close();
                        } catch (JMSException ee) {
                        }
                    }

                    System.exit(1);
                }

                /*
                 * Asynchronously process messages.
                 * Block until publisher issues a control message
                 * indicating end of publish stream.
                 */
                listener.monitor.waitTillDone();
                subscriber.close();
                session.unsubscribe("AckSub");
            } catch (JMSException e) {
                System.err.println("Exception occurred: " + e.toString());
            } finally {
                if (connection != null) {
                    try {
                        connection.close();
                    } catch (JMSException e) {
                    }
                }
            }
        }

        /**
         * The TextListener class implements the MessageListener
         * interface by defining an onMessage method for the
         * AsynchSubscriber class.
         */
        private class TextListener implements MessageListener {
            final SampleUtilities.DoneLatch monitor = new SampleUtilities.DoneLatch();

            /**
             * Casts the message to a TextMessage and displays
             * its text. A non-text message is interpreted as the
             * end of the message stream, and the message
             * listener sets its monitor state to all done
             * processing messages.
             *
             * @param message    the incoming message
             */
            public void onMessage(Message message) {
                if (message instanceof TextMessage) {
                    TextMessage msg = (TextMessage) message;

                    try {
                        System.out.println(
                                "SUBSCRIBER: " + "Processing message: "
                                + msg.getText());