/*
* Message driven beans in JBoss use the Java Messaging Servive. (JMS)
*/
package com.myjsm;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueConnection;
import javax.jms.QueueSession;
import javax.jms.QueueSender;
import javax.jms.Queue;
import javax.jms.TextMessage;
import javax.jms.Session;
import javax.jms.JMSException;
/**
* This class Implements a message sender, It can be used to send notification
* messages in a one to one scenario to the topic specified by the queueJNDI member variable.
*/
public class JmsSender {
final String queueJNDI = "queue/testQueue";
// Queue connection, hold on to this so you may close it.
QueueConnection queueConnection;
// Queue session, hold on to this so you may close it. Also used to create messages.
QueueSession queueSession;
// Use this to send messages.
QueueSender queueSender;
// Destination to send to
Queue queue;
/**
* Use close() when finished with object.
*
* @param factoryJNDI name of the queue connection factory to look up.
* @param queueJNDI name of the queue destination to look up
*/
public JmsSender() throws JMSException, NamingException {
// Get the initial context
Context jndicontext = getInitialContext();
// Get the connection factory
QueueConnectionFactory queueFactory =
(QueueConnectionFactory)jndicontext.lookup("ConnectionFactory");
// Create the connection
queueConnection = queueFactory.createQueueConnection();
// Create the session with: No Transaction and Auto ack
queueSession = queueConnection.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);
// Look up the destination
queue = (Queue)jndicontext.lookup(queueJNDI);
// Create a sender
queueSender = queueSession.createSender(queue);
}
/**
* Send the given String as a JMS message to the testQueue queue.
*/
public void send(String msg) throws JMSException {
// Create a message
TextMessage message = queueSession.createTextMessage();
message.setText(msg);
// Send the message
queueSender.send(queue, message);
}
/**
* Close session and connection. When done, no sending is possible any more.
*/
public void close() throws JMSException {
queueSession.close();
queueConnection.close();
}
/**
* Run an example sending 10 messages to testQueue. Only works up to and including JBoss 2.4.x
*/
public static void main(String[] args) {
try {
// Create the HelloSender, giving it the name of the QueueConnection
// Factory and the Queue destination to use in lookup.
JmsSender sender = new JmsSender();
// Send 10 messages
for (int i = 1; i < 11; i++) {
String msg = "Hello World no. " + i;
System.out.println("Sending message: " + msg);
sender.send(msg);
}
// Close down your sender
sender.close();
} catch(Exception ex) {
System.err.println("An exception occured while testing HelloSender: " + ex);
ex.printStackTrace();
}
}
public static javax.naming.Context getInitialContext() throws javax.naming.NamingException {
//return new InitialContext(); /*** context initialized by jndi.properties file
java.util.Properties p = new java.util.Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
p.put(Context.PROVIDER_URL, "localhost");
return new InitialContext(p);
}
}