/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
 * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 * 
 */
/**
 * The SimpleQueueReceiver class consists only of a main method, 
 * which fetches one or more messages from a queue using 
 * synchronous message delivery.  Run this program in conjunction
 * with SimpleQueueSender.  Specify a queue name on the command
 * line when you run the program.
 */
import javax.jms.*;
import javax.naming.*;

public class SimpleQueueReceiver {

    /**
     * Main method.
     *
     * @param args     the queue used by the example
     */
    public static void main(String[] args) {
        String                  queueName = null;
        Context                 jndiContext = null;
        QueueConnectionFactory  queueConnectionFactory = null;
        QueueConnection         queueConnection = null;
        QueueSession            queueSession = null;
        Queue                   queue = null;
        QueueReceiver           queueReceiver = null;
        TextMessage             message = null;
                
        /*
         * Read queue name from command line and display it.
         */
        if (args.length != 1) {
            System.out.println("Usage: java " +
                "SimpleQueueReceiver <queue-name>");
            System.exit(1);
        }
        queueName = new String(args[0]);
        System.out.println("Queue name is " + queueName);
        
        /* 
         * Create a JNDI API InitialContext object if none exists
         * yet.
         */
        try {
            jndiContext = new InitialContext();
        } catch (NamingException e) {
            System.out.println("Could not create JNDI API " +
                "context: " + e.toString());
            System.exit(1);
        }
        
        /* 
         * Look up connection factory and queue.  If either does
         * not exist, exit.
         */
        try {
            queueConnectionFactory = (QueueConnectionFactory)
                jndiContext.lookup("QueueConnectionFactory");
            queue = (Queue) jndiContext.lookup(queueName);
        } catch (NamingException e) {
            System.out.println("JNDI API lookup failed: " +
                e.toString());
            System.exit(1);
        }

        /*
         * Create connection.
         * Create session from connection; false means session is
         * not transacted.
         * Create receiver, then start message delivery.
         * Receive all text messages from queue until
         * a non-text message is received indicating end of
         * message stream.
         * Close connection.
         */
        try {
            queueConnection = 
                queueConnectionFactory.createQueueConnection();
            queueSession = 
                queueConnection.createQueueSession(false, 
                    Session.AUTO_ACKNOWLEDGE);
            queueReceiver = queueSession.createReceiver(queue);
            queueConnection.start();
            while (true) {
                Message m = queueReceiver.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.out.println("Exception occurred: " + 
                e.toString());
        } finally {
            if (queueConnection != null) {
                try {
                    queueConnection.close();
                } catch (JMSException e) {}
            }
        }
    }
}