/*
* 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.failover;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import org.jboss.example.jms.common.ExampleSupport;
/**
* The example creates a connection to a clustered messaging instance and sends a message to a
* clustered queue. The example then kills the cluster node the connection was created to and then
* shows how the client code can receive the message with using the *same* connection (that, in
* the mean time, have transparently failed over to another cluster node).
*
* 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 QueueFailoverExample extends ExampleSupport
{
public void example() throws Exception
{
String destinationName = getDestinationJNDIName();
InitialContext ic = null;
Connection connection = null;
try
{
// Create a connection to the clustered messaging instance
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 ...
connection = cf.createConnection();
connection.start();
// Send 2 messagea to the queue
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(distributedQueue);
TextMessage message1 = session.createTextMessage("Hello1!");
producer.send(message1);
TextMessage message2 = session.createTextMessage("Hello2!");
producer.send(message2);
log("The messages were successfully sent to the distributed queue");
// Now receive one of the messages
MessageConsumer consumer = session.createConsumer(distributedQueue);
TextMessage rm1 = (TextMessage)consumer.receive(2000);
log("Received message: " + rm1.getText());
assertEquals("Hello1!", rm1.getText());
// Kill the active node
killActiveNode();
Thread.sleep(30000); // TODO not necesare after we install the client valve
// receive the second message on the failed over node
TextMessage rm2 = (TextMessage)consumer.receive(2000);
log("Received message: " + rm2.getText());
assertEquals("Hello2!", rm2.getText());
displayProviderInfo(connection.getMetaData());
}
finally
{
if (ic != null)
{
try
{
ic.close();
}
catch(Exception e)
{
throw e;
}
}
try
{
if (connection != null)
{
connection.close();
}
}
catch(JMSException e)
{
log("Could not close connection " + connection + ", exception was " + e);
throw e;
}
}
}
protected boolean isQueueExample()
{
return true;
}
public static void main(String[] args)
{
new QueueFailoverExample().run();
}
}