thoerup/messagedriven/ReverserServlet.java

package dk.thoerup.messagedriven;

import java.io.IOException;
import java.util.Random;

import javax.annotation.Resource;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "ReverserServlet", urlPatterns = { "/ReverserServlet" })
public class ReverserServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
    
    // resource mapped vars may of course not be static !
    @Resource(mappedName = "jms/helloFactory")
    private QueueConnectionFactory connectionFactory;

    @Resource(mappedName = "jms/reverse")
    private Queue queue;
    
    @Resource(mappedName = "jms/reverseResponse")
    private Queue responseQueue;
    

        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                String msg = request.getParameter("msg");
                if (msg == null) 
                        msg = "Default";
                
                Random r = new Random();
                
                try {
                        QueueConnection connection = connectionFactory.createQueueConnection();                 
                        
                
                QueueSession session = connection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);
                MessageProducer producer = session.createProducer(queue);                              
                
                TextMessage message = session.createTextMessage();
                
                String corrID = "" + r.nextInt();
                
                message.setText(msg);           
                message.setJMSReplyTo(responseQueue);           
                message.setJMSCorrelationID(corrID);
                
                                
                producer.send(message);
                
                //Remember ' around the correleationID in JMS selector
                QueueReceiver consumer = session.createReceiver(responseQueue,"JMSCorrelationID='" + corrID + "'");
                connection.start(); //incomming messages is not received until a start is given
                
                
                TextMessage reply = (TextMessage) consumer.receive(500); //wait max 500 ms for replay
                                
                
                if (reply != null)              
                        response.getWriter().print("Reply: " + reply.getText() );
                else
                        response.getWriter().print("No reply !!!");
                
                connection.close();
                } catch (Exception e) {
                        throw new ServletException(e);
                }
        }
        
        class Test implements MessageListener {

                @Override
                public void onMessage(Message message) {
                        // TODO Auto-generated method stub
                        System.out.println("onMessage() ");
                }
                
        }
}
1	package dk.thoerup.messagedriven;
2
3	import java.io.IOException;
4	import java.util.Random;
5
6	import javax.annotation.Resource;
7	import javax.jms.Message;
8	import javax.jms.MessageListener;
9	import javax.jms.MessageProducer;
10	import javax.jms.Queue;
11	import javax.jms.QueueConnection;
12	import javax.jms.QueueConnectionFactory;
13	import javax.jms.QueueReceiver;
14	import javax.jms.QueueSession;
15	import javax.jms.Session;
16	import javax.jms.TextMessage;
17	import javax.servlet.ServletException;
18	import javax.servlet.annotation.WebServlet;
19	import javax.servlet.http.HttpServlet;
20	import javax.servlet.http.HttpServletRequest;
21	import javax.servlet.http.HttpServletResponse;
22
23	@WebServlet(name = "ReverserServlet", urlPatterns = { "/ReverserServlet" })
24	public class ReverserServlet extends HttpServlet {
25	private static final long serialVersionUID = 1L;
26
27	// resource mapped vars may of course not be static !
28	@Resource(mappedName = "jms/helloFactory")
29	private QueueConnectionFactory connectionFactory;
30
31	@Resource(mappedName = "jms/reverse")
32	private Queue queue;
33
34	@Resource(mappedName = "jms/reverseResponse")
35	private Queue responseQueue;
36
37
38
39	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
40	String msg = request.getParameter("msg");
41	if (msg == null)
42	msg = "Default";
43
44	Random r = new Random();
45
46	try {
47	QueueConnection connection = connectionFactory.createQueueConnection();
48
49
50	QueueSession session = connection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);
51	MessageProducer producer = session.createProducer(queue);
52
53	TextMessage message = session.createTextMessage();
54
55	String corrID = "" + r.nextInt();
56
57	message.setText(msg);
58	message.setJMSReplyTo(responseQueue);
59	message.setJMSCorrelationID(corrID);
60
61
62	producer.send(message);
63
64	//Remember ' around the correleationID in JMS selector
65	QueueReceiver consumer = session.createReceiver(responseQueue,"JMSCorrelationID='" + corrID + "'");
66	connection.start(); //incomming messages is not received until a start is given
67
68
69	TextMessage reply = (TextMessage) consumer.receive(500); //wait max 500 ms for replay
70
71
72	if (reply != null)
73	response.getWriter().print("Reply: " + reply.getText() );
74	else
75	response.getWriter().print("No reply !!!");
76
77	connection.close();
78	} catch (Exception e) {
79	throw new ServletException(e);
80	}
81	}
82
83	class Test implements MessageListener {
84
85	@Override
86	public void onMessage(Message message) {
87	// TODO Auto-generated method stub
88	System.out.println("onMessage() ");
89	}
90
91	}
92	}