/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.example.jms.distributedqueue;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Queue;
import javax.naming.InitialContext;
import org.jboss.example.jms.common.ExampleSupport;
/**
* The example creates two connections to two distinct cluster nodes on which we have previously
* deployed a distributed queue. The example sends and receives messages using both connections.
*
* NOTE: This is an example that assumes a NullMessagePullPolicy. This is the default configuration
* option a release ships with, and also is a very boring options, since messages are *NOT*
* redistributed among nodes. An example that assumes a DefaultMessagePullPolicy is coming
* soon (http://jira.jboss.org/jira/browse/JBMESSAGING-907).
*
* Since this example is also used as a smoke test, it is essential that the VM exits with exit
* code 0 in case of successful execution and a non-zero value on failure.
*
* @author <a href="mailto:ovidiu@jboss.org">Ovidiu Feodorov</a>
* @version <tt>$Revision: 1001 $</tt>
*
* $Id: TopicExample.java 1001 2006-06-24 09:05:40Z timfox $
*/
public class DistributedQueueExample extends ExampleSupport
{
public void example() throws Exception
{
String destinationName = getDestinationJNDIName();
InitialContext ic = null;
Connection connection0 = null;
Connection connection1 = null;
try
{
// connecting to the first node
ic = new InitialContext();
ConnectionFactory cf = (ConnectionFactory)ic.lookup("/ConnectionFactory");
Queue distributedQueue = (Queue)ic.lookup(destinationName);
log("Distributed queue " + destinationName + " exists");
// When connecting to a messaging cluster, the ConnectionFactory has the capability of
// transparently creating physical connections to different cluster nodes, in a round
// robin fashion ...
// ... so this is a connection to a cluster node
connection0 = cf.createConnection();
// ... and this is a connection to a different cluster node
connection1 = cf.createConnection();
// Let's make sure that (this example is also a smoke test)
assertNotEquals(getServerID(connection0), getServerID(connection1));
// Create a session, a producer and a consumer on the first connection
Session session0 = connection0.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer publisher0 = session0.createProducer(distributedQueue);
MessageConsumer consumer0 = session0.createConsumer(distributedQueue);
ExampleListener messageListener0 = new ExampleListener("MessageListener0");
consumer0.setMessageListener(messageListener0);
// Create another session, producer and consumer on the second connection
Session session1 = connection1.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer publisher1 = session1.createProducer(distributedQueue);
MessageConsumer consumer1 = session1.createConsumer(distributedQueue);
ExampleListener messageListener1 = new ExampleListener("MessageListener1");
consumer1.setMessageListener(messageListener1);
// Start connections, so we can receive the message
connection0.start();
connection1.start();
// Send the message
TextMessage message = session0.createTextMessage("Hello!");
publisher0.send(message);
message = session1.createTextMessage("Another Hello!");
publisher1.send(message);
log("The messages were successfully sent to the distributed queue");
// NOTE: We know that this example is extremely boring, but so it's NullMessagePullPolicy.
// However, this is the default configuration option a release ships with.
messageListener0.waitForMessage(3000);
message = (TextMessage)messageListener0.getMessage();
log(messageListener0.getName() + " received message: " + message.getText());
assertEquals("Hello!", message.getText());
messageListener1.waitForMessage(3000);
message = (TextMessage)messageListener1.getMessage();
log(messageListener1.getName() + " received message: " + message.getText());
assertEquals("Another Hello!", message.getText());
displayProviderInfo(connection0.getMetaData());
}
finally
{
if (ic != null)
{
try
{
ic.close();
}
catch(Exception e)
{
throw e;
}
}
try
{
if (connection0 != null)
{
connection0.close();
}
}
catch(JMSException e)
{
log("Could not close connection " + connection0 + ", exception was " + e);
throw e;
}
try
{
if (connection1 != null)
{
connection1.close();
}
}
catch(JMSException e)
{
log("Could not close connection " + connection1 + ", exception was " + e);
throw e;
}
}
}
protected boolean isQueueExample()
{
return true;
}
public static void main(String[] args)
{
new DistributedQueueExample().run();
}
}