Consumer.java example

Explorer
activemq-master
/**
 * 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 example.composite.dest;

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * @author <a href="http://www.christianposta.com/blog">Christian Posta</a>
 */
public class Consumer {

    private static final String BROKER_URL = "tcp://localhost:61616";
    private static final Boolean NON_TRANSACTED = false;
    private static final long TIMEOUT = 20000;

    public static void main(String[] args) {
        String url = BROKER_URL;
        if (args.length > 0) {
            url = args[0].trim();
        }
        System.out.println("\nWaiting to receive messages... will timeout after " + TIMEOUT / 1000 +"s");
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("admin", "password", url);
        Connection connection = null;

        try {

            connection = connectionFactory.createConnection();
            connection.start();

            Session session = connection.createSession(NON_TRANSACTED, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("test-queue");
            Destination destinationFoo = session.createQueue("test-queue-foo");
            Destination destinationBar = session.createQueue("test-queue-bar");
            Destination destinationTopicFoo = session.createTopic("test-topic-foo");

            MessageConsumer consumer = session.createConsumer(destination);
            MessageConsumer consumerFoo = session.createConsumer(destinationFoo);
            MessageConsumer consumerBar = session.createConsumer(destinationBar);
            MessageConsumer consumerTopicFoo = session.createConsumer(destinationTopicFoo);

            int i = 0;
            while (true) {
                Message message = consumer.receive(TIMEOUT);

                if (message != null) {
                    if (message instanceof TextMessage) {
                        String text = ((TextMessage) message).getText();
                        System.out.println("Got " + i++ + ". message on test-queue: " + text);
                    }
                } else {
                    break;
                }

                message = consumerFoo.receive(TIMEOUT);

                if (message != null) {
                    if (message instanceof TextMessage) {
                        String text = ((TextMessage) message).getText();
                        System.out.println("Got " + i++ + ". message on test-queue-foo: " + text);
                    }
                } else {
                    break;
                }

                message = consumerBar.receive(TIMEOUT);

                if (message != null) {
                    if (message instanceof TextMessage) {
                        String text = ((TextMessage) message).getText();
                        System.out.println("Got " + i++ + ". message on test-queue-bar: " + text);
                    }
                } else {
                    break;
                }

                message = consumerTopicFoo.receive(TIMEOUT);

                if (message != null) {
                    if (message instanceof TextMessage) {
                        String text = ((TextMessage) message).getText();
                        System.out.println("Got " + i++ + ". message on test-topic-bar: " + text);
                    }
                } else {
                    break;
                }

            }

            consumer.close();
            session.close();

        } catch (Exception e) {
            System.out.println("Caught exception!");
        }
        finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                    System.out.println("Could not close an open connection...");
                }
            }
        }
    }
}