/*
* Copyright 2009 Red Hat, Inc.
* Red Hat licenses this file to you under the Apache License, version
* 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package org.hornetq.jms.example;
import java.util.ArrayList;
import java.util.HashMap;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.XAConnection;
import javax.jms.XAConnectionFactory;
import javax.jms.XASession;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import javax.naming.InitialContext;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
import org.hornetq.api.core.management.ObjectNameBuilder;
import org.hornetq.common.example.DummyXid;
import org.hornetq.common.example.HornetQExample;
import org.hornetq.utils.UUIDGenerator;
/**
* A simple JMS example showing how to administer un-finished transactions.
*
* @author <a href="hgao@redhat.com">Howard Gao</a>
*/
public class XAHeuristicExample extends HornetQExample
{
private volatile boolean result = true;
private final ArrayList<String> receiveHolder = new ArrayList<String>();
private final String JMX_URL = "service:jmx:rmi:///jndi/rmi://localhost:3001/jmxrmi";
public static void main(final String[] args)
{
new XAHeuristicExample().run(args);
}
@Override
public boolean runExample() throws Exception
{
XAConnection connection = null;
InitialContext initialContext = null;
try
{
// Step 1. Create an initial context to perform the JNDI lookup.
initialContext = getContext(0);
// Step 2. Lookup on the queue
Queue queue = (Queue)initialContext.lookup("/queue/exampleQueue");
// Step 3. Perform a lookup on the XA Connection Factory
XAConnectionFactory cf = (XAConnectionFactory)initialContext.lookup("/XAConnectionFactory");
// Step 4.Create a JMS XAConnection
connection = cf.createXAConnection();
// Step 5. Start the connection
connection.start();
// Step 6. Create a JMS XASession
XASession xaSession = connection.createXASession();
// Step 7. Create a normal session
Session normalSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 8. Create a normal Message Consumer
MessageConsumer normalConsumer = normalSession.createConsumer(queue);
normalConsumer.setMessageListener(new SimpleMessageListener());
// Step 9. Get the JMS Session
Session session = xaSession.getSession();
// Step 10. Create a message producer
MessageProducer producer = session.createProducer(queue);
// Step 11. Create two Text Messages
TextMessage helloMessage = session.createTextMessage("hello");
TextMessage worldMessage = session.createTextMessage("world");
// Step 12. create a transaction
Xid xid1 = new DummyXid("xa-example1".getBytes(), 1, UUIDGenerator.getInstance()
.generateStringUUID()
.getBytes());
// Step 13. Get the JMS XAResource
XAResource xaRes = xaSession.getXAResource();
// Step 14. Begin the Transaction work
xaRes.start(xid1, XAResource.TMNOFLAGS);
// Step 15. do work, sending hello message.
producer.send(helloMessage);
System.out.println("Sent message " + helloMessage.getText());
// Step 16. Stop the work for xid1
xaRes.end(xid1, XAResource.TMSUCCESS);
// Step 17. Prepare xid1
xaRes.prepare(xid1);
// Step 18. Check none should be received
checkNoMessageReceived();
// Step 19. Create another transaction.
Xid xid2 = new DummyXid("xa-example2".getBytes(), 1, UUIDGenerator.getInstance()
.generateStringUUID()
.getBytes());
// Step 20. Begin the transaction work
xaRes.start(xid2, XAResource.TMNOFLAGS);
// Step 21. Send the second message
producer.send(worldMessage);
System.out.println("Sent message " + worldMessage.getText());
// Step 22. Stop the work for xid2
xaRes.end(xid2, XAResource.TMSUCCESS);
// Step 23. prepare xid2
xaRes.prepare(xid2);
// Step 24. Again, no messages should be received!
checkNoMessageReceived();
// Step 25. Create JMX Connector to connect to the server's MBeanServer
JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), new HashMap<String, String>());
// Step 26. Retrieve the MBeanServerConnection
MBeanServerConnection mbsc = connector.getMBeanServerConnection();
// Step 27. List the prepared transactions
ObjectName serverObject = ObjectNameBuilder.DEFAULT.getHornetQServerObjectName();
String[] infos = (String[])mbsc.invoke(serverObject, "listPreparedTransactions", null, null);
System.out.println("Prepared transactions: ");
for (String i : infos)
{
System.out.println(i);
}
// Step 28. Roll back the first transaction
mbsc.invoke(serverObject,
"rollbackPreparedTransaction",
new String[] { DummyXid.toBase64String(xid1) },
new String[] { "java.lang.String" });
// Step 29. Commit the second one
mbsc.invoke(serverObject,
"commitPreparedTransaction",
new String[] { DummyXid.toBase64String(xid2) },
new String[] { "java.lang.String" });
Thread.sleep(2000);
// Step 30. Check the result, only the 'world' message received
checkMessageReceived("world");
// Step 31. Check the prepared transaction again, should have none.
infos = (String[])mbsc.invoke(serverObject, "listPreparedTransactions", null, null);
System.out.println("No. of prepared transactions now: " + infos.length);
// Step 32. Close the JMX Connector
connector.close();
return result;
}
finally
{
// Step 32. Be sure to close our JMS resources!
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}
}
private void checkMessageReceived(final String value)
{
if (receiveHolder.size() != 1)
{
System.out.println("Number of messages received not correct ! -- " + receiveHolder.size());
result = false;
}
String msg = receiveHolder.get(0);
if (!msg.equals(value))
{
System.out.println("Received message [" + msg + "], but we expect [" + value + "]");
result = false;
}
receiveHolder.clear();
}
private void checkNoMessageReceived()
{
if (receiveHolder.size() > 0)
{
System.out.println("Message received, wrong!");
result = false;
}
receiveHolder.clear();
}
public class SimpleMessageListener implements MessageListener
{
public void onMessage(final Message message)
{
try
{
System.out.println("Message received: " + ((TextMessage)message).getText());
receiveHolder.add(((TextMessage)message).getText());
}
catch (JMSException e)
{
result = false;
e.printStackTrace();
}
}
}
}