package org.jboss.book.jms.ex2;
                
import javax.ejb.MessageDrivenBean;
import javax.ejb.MessageDrivenContext;
import javax.ejb.EJBException;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import javax.naming.NamingException;

/** 
 * An MDB that transforms the TextMessages it receives and send the
 * transformed messages to the Queue found in the incoming message
 * JMSReplyTo header.
 * 
 * @author Scott.Stark@jboss.org
 * @version $Revision: 1.9 $
 */
public class TextMDB 
    implements MessageDrivenBean, MessageListener
{
    private MessageDrivenContext ctx = null;
    private QueueConnection conn;
    private QueueSession session;
    
    public TextMDB()
    {
        System.out.println("TextMDB.ctor, this="+hashCode());
    }
    
    public void setMessageDrivenContext(MessageDrivenContext ctx)
    {
        this.ctx = ctx;
        System.out.println("TextMDB.setMessageDrivenContext, this=" + 
                           hashCode());
    }
    
    public void ejbCreate()
    {
        System.out.println("TextMDB.ejbCreate, this="+hashCode());
        try {
            setupPTP();
        } catch (Exception e) {
            throw new EJBException("Failed to init TextMDB", e);
        }
    }

    public void ejbRemove()
    {
        System.out.println("TextMDB.ejbRemove, this="+hashCode());
        ctx = null;
        try {
            if (session != null) {
                session.close();
            }
            if (conn != null) {
                conn.close();
            }
        } catch(JMSException e) {
            e.printStackTrace();
        }
    }
                
    public void onMessage(Message msg)
    {
        System.out.println("TextMDB.onMessage, this="+hashCode());
        try {
            TextMessage tm = (TextMessage) msg;
            String text = tm.getText() + "processed by: "+hashCode();
            Queue dest = (Queue) msg.getJMSReplyTo();
            sendReply(text, dest);
        } catch(Throwable t) {
            t.printStackTrace();
        }
    }
                
    private void setupPTP()
        throws JMSException, NamingException
    {
        InitialContext iniCtx = new InitialContext();
        Object tmp = iniCtx.lookup("java:comp/env/jms/QCF");
        QueueConnectionFactory qcf = (QueueConnectionFactory) tmp;
        conn = qcf.createQueueConnection();
        session = conn.createQueueSession(false,
                                          QueueSession.AUTO_ACKNOWLEDGE);
        conn.start();
    }

    private void sendReply(String text, Queue dest)
        throws JMSException
    {
        System.out.println("TextMDB.sendReply, this=" + 
                           hashCode() + ", dest="+dest);
        QueueSender sender = session.createSender(dest);
        TextMessage tm = session.createTextMessage(text);
        sender.send(tm);
        sender.close();
    }
}

<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC 
          "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
          "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
    <enterprise-beans>
        <message-driven>
            <ejb-name>TextMDB</ejb-name>
            <ejb-class>org.jboss.book.jms.ex2.TextMDB</ejb-class>
            <transaction-type>Container</transaction-type>
            <acknowledge-mode>AUTO_ACKNOWLEDGE</acknowledge-mode>
            <message-driven-destination>
                <destination-type>javax.jms.Queue</destination-type>
            </message-driven-destination>
            <res-ref-name>jms/QCF</res-ref-name>
            <resource-ref>
                <res-type>javax.jms.QueueConnectionFactory</res-type>
                <res-auth>Container</res-auth>
            </resource-ref>
        </message-driven>
    </enterprise-beans>
</ejb-jar>

<?xml version="1.0"?>
<jboss>
    <enterprise-beans>
        <message-driven>
            <ejb-name>TextMDB</ejb-name>
            <destination-jndi-name>queue/B</destination-jndi-name>
            <resource-ref>
                <res-ref-name>jms/QCF</res-ref-name>
                <jndi-name>ConnectionFactory</jndi-name>
            </resource-ref>
        </message-driven>
    </enterprise-beans>
</jboss>

package org.jboss.book.jms.ex2;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import EDU.oswego.cs.dl.util.concurrent.CountDown;

/**
 *  A complete JMS client example program that sends N TextMessages to
 *  a Queue B and asynchronously receives the messages as modified by
 *  TextMDB from Queue A.
 *
 *  @author Scott.Stark@jboss.org
 *  @version $Revision: 1.9 $
 */
public class SendRecvClient
{
    static final int N = 10;
    static CountDown done = new CountDown(N);

    QueueConnection conn;
    QueueSession session;
    Queue queA;
    Queue queB;
    
    public static class ExListener 
        implements MessageListener
    {
        public void onMessage(Message msg)
        {
            done.release();
            TextMessage tm = (TextMessage) msg;
            try {
                System.out.println("onMessage, recv text="+tm.getText());
            } catch(Throwable t) {
                t.printStackTrace();
            }
        }
    }
    
    public void setupPTP()
        throws JMSException, NamingException
    {
        InitialContext iniCtx = new InitialContext();
        Object tmp = iniCtx.lookup("ConnectionFactory");
        QueueConnectionFactory qcf = (QueueConnectionFactory) tmp;
        conn = qcf.createQueueConnection();
        queA = (Queue) iniCtx.lookup("queue/A");
        queB = (Queue) iniCtx.lookup("queue/B");
        session = conn.createQueueSession(false,
                                          QueueSession.AUTO_ACKNOWLEDGE);
        conn.start();
    }
    
    public void sendRecvAsync(String textBase)
        throws JMSException, NamingException, InterruptedException
    {
        System.out.println("Begin sendRecvAsync");

        // Setup the PTP connection, session
        setupPTP();

        // Set the async listener for queA
        QueueReceiver recv = session.createReceiver(queA);
        recv.setMessageListener(new ExListener());

        // Send a few text msgs to queB
        QueueSender send = session.createSender(queB);

        for(int m = 0; m < 10; m ++) {
            TextMessage tm = session.createTextMessage(textBase+"#"+m);
            tm.setJMSReplyTo(queA);
            send.send(tm);
            System.out.println("sendRecvAsync, sent text=" + tm.getText());
        }
        System.out.println("End sendRecvAsync");
    }
    
    public void stop() 
        throws JMSException
    {
        conn.stop();
        session.close();
        conn.close();
    }
    
    public static void main(String args[]) 
        throws Exception
    {
        System.out.println("Begin SendRecvClient,now=" + 
                           System.currentTimeMillis());
        SendRecvClient client = new SendRecvClient();
        client.sendRecvAsync("A text msg");
        client.done.acquire();
        client.stop();
        System.exit(0);
        System.out.println("End SendRecvClient");
    }
    
}