synchconsumer.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.Destination;
import javax.jms.Queue;
import javax.jms.Topic;
import javax.jms.Connection;
import javax.jms.Session;
import javax.jms.MessageConsumer;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.JMSException;
import javax.annotation.Resource;


/**
 * The SynchConsumer class consists only of a main method,
 * which fetches one or more messages from a queue or topic using
 * synchronous message delivery.  Run this program in conjunction
 * with Producer.  Specify "queue" or "topic" on the
 * command line when you run the program.
 */
public class SynchConsumer {
    @Resource(mappedName = "jms/ConnectionFactory")
    private static ConnectionFactory connectionFactory;
    @Resource(mappedName = "jms/Queue")
    private static Queue queue;
    @Resource(mappedName = "jms/Topic")
    private static Topic topic;

    /**
     * Main method.
     *
     * @param args     the destination name and type used by the
     *                 example
     */
    public static void main(String[] args) {
        String destType = null;
        Connection connection = null;
        Session session = null;
        Destination dest = null;
        MessageConsumer consumer = null;
        TextMessage message = null;

        if (args.length != 1) {
            System.err.println("Program takes one argument: <dest_type>");
            System.exit(1);
        }

        destType = args[0];
        System.out.println("Destination type is " + destType);

        if (!(destType.equals("queue") || destType.equals("topic"))) {
            System.err.println("Argument must be \"queue\" or \"topic\"");
            System.exit(1);
        }

        try {
            if (destType.equals("queue")) {
                dest = (Destination) queue;
            } else {
                dest = (Destination) topic;
            }
        } catch (Exception e) {
            System.err.println("Error setting destination: " + e.toString());
            e.printStackTrace();
            System.exit(1);
        }

        /*
         * Create connection.
         * Create session from connection; false means session is
         * not transacted.
         * Create consumer, then start message delivery.
         * Receive all text messages from destination until
         * a non-text message is received indicating end of
         * message stream.
         * Close connection.
         */
        try {
            connection = connectionFactory.createConnection();
            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            consumer = session.createConsumer(dest);
            connection.start();

            while (true) {
                Message m = consumer.receive(1);

                if (m != null) {
                    if (m instanceof TextMessage) {
                        message = (TextMessage) m;
                        System.out.println(
                                "Reading message: " + message.getText());
                    } else {
                        break;
                    }
                }
            }
        } catch (JMSException e) {
            System.err.println("Exception occurred: " + e.toString());
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                }
            }
        }
    }
}