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Diffstat (limited to 'trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/transacted/QueueToTopic.java')
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1 files changed, 259 insertions, 0 deletions
diff --git a/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/transacted/QueueToTopic.java b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/transacted/QueueToTopic.java new file mode 100644 index 0000000000..f3bf9f8686 --- /dev/null +++ b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/jmsexample/transacted/QueueToTopic.java @@ -0,0 +1,259 @@ +/* + * + * 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.transacted; + +import javax.jms.*; +import javax.naming.Context; +import javax.naming.InitialContext; +import java.util.Properties; + +/** + * Transactional message example sends a number of messages to a Queue + * and then uses a transacted session to move them from the Queue to a Topic. + * <p/> + * <p>The program completes the following steps: + * <ul> + * <li>Publish the specified number of messages to the queue.</li> + * <li>Within a transacted session consume all messages from the queue + * and publish them to the topic.</li> + * <li>By default commit the transacted session, unless the "<code>-rollback true</code>" + * option is specified in which case roll it back.</li> + * <li>Check for outstanding messages on the queue.</li> + * <li>Check for outstanding messages on the topic.</li> + * </ul> + * <p/> + */ +public class QueueToTopic +{ + /* Used in log output. */ + private static final String CLASS="QueueToTopic"; + + + /* Specify if the transaction is committed */ + private boolean _commit; + + /** + * Create a QueueToTopic client. + * + * @param commit Specifies if the transaction should be committed. + */ + public QueueToTopic(boolean commit) + { + _commit=commit; + } + + /** + * Run the message mover example. + * + * @param args Command line arguments. + */ + public static void main(String[] args) + { + boolean commit=true; + if (args.length > 1) + { + if (args[0].equalsIgnoreCase("-rollback")) + { + commit=!Boolean.getBoolean(args[1]); + } + } + QueueToTopic mover=new QueueToTopic(commit); + mover.runTest(); + } + + private void runTest() + { + try + { + // Load JNDI properties + Properties properties=new Properties(); + properties.load(this.getClass().getResourceAsStream("transacted.properties")); + + //Create the initial context + Context ctx=new InitialContext(properties); + + // Lookup the connection factory + ConnectionFactory conFac=(ConnectionFactory) ctx.lookup("qpidConnectionfactory"); + // create the connection + 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); + } + }); + + // Start the connection + connection.start(); + + /** + * Create nonTransactedSession. This non-transacted auto-ack session is used to create the MessageProducer + * that is used to populate the queue and the MessageConsumer that is used to consume the messages + * from the topic. + */ + System.out.println(CLASS + ": Creating a non-transacted, auto-acknowledged session"); + Session nonTransactedSession=connection.createSession(false, Session.AUTO_ACKNOWLEDGE); + + // Lookup the queue + Queue queue=(Queue) ctx.lookup("transactedQueue"); + + // Lookup the topic + Topic topic=(Topic) ctx.lookup("transactedTopic"); + + // Make sure that the queue is empty + System.out.print(CLASS + ": Purging messages from queue..."); + MessageConsumer queueMessageConsumer=nonTransactedSession.createConsumer(queue); + Message purgedMessage; + int numberPurged=-1; + do + { + purgedMessage=queueMessageConsumer.receiveNoWait(); + numberPurged++; + } + while (purgedMessage != null); + System.out.println(numberPurged + " message(s) purged."); + + // Create the MessageProducer for the queue + System.out.println(CLASS + ": Creating a MessageProducer for the queue"); + MessageProducer messageProducer=nonTransactedSession.createProducer(queue); + + // Now create the MessageConsumer for the topic + System.out.println(CLASS + ": Creating a MessageConsumer for the topic"); + MessageConsumer topicMessageConsumer=nonTransactedSession.createConsumer(topic); + + // Create a textMessage. We're using a TextMessage for this example. + System.out.println(CLASS + ": Creating a TestMessage to send to the destination"); + TextMessage textMessage=nonTransactedSession.createTextMessage("Sample text message"); + + // Loop to publish the requested number of messages to the queue. + for (int i=1; i <= 5; i++) + { + messageProducer + .send(textMessage, DeliveryMode.PERSISTENT, Message.DEFAULT_PRIORITY, + Message.DEFAULT_TIME_TO_LIVE); + + // Print out details of textMessage just sent + System.out.println(CLASS + ": Message sent: " + i + " " + textMessage.getJMSMessageID()); + } + + // Create a new transacted Session to move the messages from the queue to the topic + Session transactedSession=connection.createSession(true, Session.SESSION_TRANSACTED); + + // Create a new message consumer from the queue + MessageConsumer transactedConsumer=transactedSession.createConsumer(queue); + + // Create a new message producer for the topic + MessageProducer transactedProducer=transactedSession.createProducer(topic); + + // Loop to consume the messages from the queue and publish them to the topic + Message receivedMessage; + for (int i=1; i <= 5; i++) + { + // Receive a message + receivedMessage=transactedConsumer.receive(); + System.out.println(CLASS + ": Moving message: " + i + " " + receivedMessage.getJMSMessageID()); + // Publish it to the topic + transactedProducer.send(receivedMessage); + } + + // Either commit or rollback the transacted session based on the command line args. + if (_commit) + { + System.out.println(CLASS + ": Committing transacted session."); + transactedSession.commit(); + } + else + { + System.out.println(CLASS + ": Rolling back transacted session."); + transactedSession.rollback(); + } + + // Now consume any outstanding messages on the queue + System.out.print(CLASS + ": Mopping up messages from queue"); + if (_commit) + { + System.out.print(" (expecting none)..."); + } + else + { + System.out.print(" (expecting " + 5 + ")..."); + } + + Message moppedMessage; + int numberMopped=0; + do + { + moppedMessage=queueMessageConsumer.receiveNoWait(); + if (moppedMessage != null) + { + numberMopped++; + } + } + while (moppedMessage != null); + System.out.println(numberMopped + " message(s) mopped."); + + // Now consume any outstanding messages for the topic subscriber + System.out.print(CLASS + ": Mopping up messages from topic"); + + if (_commit) + { + System.out.print(" (expecting " + 5 + ")..."); + } + else + { + System.out.print(" (expecting none)..."); + } + + numberMopped=0; + do + { + moppedMessage=topicMessageConsumer.receiveNoWait(); + if (moppedMessage != null) + { + numberMopped++; + } + } + while (moppedMessage != null); + System.out.println(numberMopped + " message(s) mopped."); + + // Close the QueueConnection 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); + } + } +} |