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Diffstat (limited to 'trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/fanout/Listener.java')
| -rwxr-xr-x | trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/fanout/Listener.java | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/fanout/Listener.java b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/fanout/Listener.java new file mode 100755 index 0000000000..fb750693b2 --- /dev/null +++ b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/fanout/Listener.java @@ -0,0 +1,201 @@ +/* + * + * 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(); + } + } + } +} |