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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.qpid.example.jmsexample.fanout;
import java.util.Properties;
import javax.jms.*;
import javax.naming.Context;
import javax.naming.InitialContext;
/**
* The example creates a MessageConsumer on the specified
* Queue and uses a MessageListener with this MessageConsumer
* in order to enable asynchronous delivery.
*/
public class Listener implements MessageListener
{
/* Used in log output. */
private static final String CLASS = "Listener";
/**
* An object to synchronize on.
*/
private final Object _lock = new Object();
/**
* A boolean to indicate a clean finish.
*/
private boolean _finished = false;
/**
* A boolean to indicate an unsuccesful finish.
*/
private boolean _failed = false;
/**
* Run the message consumer example.
*
* @param args Command line arguments.
*/
public static void main(String[] args) throws Exception
{
if (args.length == 0)
{
throw new Exception("You need to specify the JNDI name for the queue");
}
Listener listener = new Listener();
listener.runTest(args[0]);
}
/**
* Start the example.
*/
private void runTest(String queueName)
{
try
{
Properties properties = new Properties();
properties.load(this.getClass().getResourceAsStream("fanout.properties"));
//Create the initial context
Context ctx = new InitialContext(properties);
Destination destination = (Destination)ctx.lookup(queueName);
// Declare the connection
ConnectionFactory conFac = (ConnectionFactory)ctx.lookup("qpidConnectionfactory");
Connection connection = conFac.createConnection();
// As this application is using a MessageConsumer we need to set an ExceptionListener on the connection
// so that errors raised within the JMS client library can be reported to the application
System.out.println(
CLASS + ": Setting an ExceptionListener on the connection as sample uses a MessageConsumer");
connection.setExceptionListener(new ExceptionListener()
{
public void onException(JMSException jmse)
{
// The connection may have broken invoke reconnect code if available.
System.err.println(CLASS + ": The sample received an exception through the ExceptionListener");
System.exit(0);
}
});
// Create a session on the connection
// This session is a default choice of non-transacted and uses
// the auto acknowledge feature of a session.
System.out.println(CLASS + ": Creating a non-transacted, auto-acknowledged session");
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Create a MessageConsumer
System.out.println(CLASS + ": Creating a MessageConsumer");
MessageConsumer messageConsumer = session.createConsumer(destination);
// Set a message listener on the messageConsumer
messageConsumer.setMessageListener(this);
// Now the messageConsumer is set up we can start the connection
System.out.println(CLASS + ": Starting connection so MessageConsumer can receive messages");
connection.start();
// Wait for the messageConsumer to have received all the messages it needs
synchronized (_lock)
{
while (!_finished && !_failed)
{
_lock.wait();
}
}
// If the MessageListener abruptly failed (probably due to receiving a non-text message)
if (_failed)
{
System.out.println(CLASS + ": This sample failed as it received unexpected messages");
}
// Close the connection to the server
System.out.println(CLASS + ": Closing connection");
connection.close();
// Close the JNDI reference
System.out.println(CLASS + ": Closing JNDI context");
ctx.close();
}
catch (Exception exp)
{
System.err.println(CLASS + ": Caught an Exception: " + exp);
}
}
/**
* This method is required by the <CODE>MessageListener</CODE> interface. It
* will be invoked when messages are available.
* After receiving the finish message (That's all, folks!) it releases a lock so that the
* main program may continue.
*
* @param message The message.
*/
public void onMessage(Message message)
{
try
{
String text;
if (message instanceof TextMessage)
{
text = ((TextMessage) message).getText();
}
else
{
byte[] body = new byte[(int) ((BytesMessage) message).getBodyLength()];
((BytesMessage) message).readBytes(body);
text = new String(body);
}
if (text.equals("That's all, folks!"))
{
System.out.println(CLASS + ": Received final message " + text);
synchronized (_lock)
{
_finished = true;
_lock.notifyAll();
}
}
else
{
System.out.println(CLASS + ": Received message: " + text);
}
}
catch (JMSException exp)
{
System.out.println(CLASS + ": Caught an exception handling a received message");
exp.printStackTrace();
synchronized (_lock)
{
_failed = true;
_lock.notifyAll();
}
}
}
}
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