examples/features/broker-connection/disaster-recovery/src/main/java/org/apache/activemq/artemis/jms/example/DisasterAndRecovery.java

/*
 * 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.activemq.artemis.jms.example;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.qpid.jms.JmsConnectionFactory;

/**
 * On this example, two brokers are mirrored.
 * Everything that is happening on the first broker will be mirrored on the second, and Vice Versa.
 */
public class DisasterAndRecovery {

   public static void main(final String[] args) throws Exception {
      ConnectionFactory cfServer0 = new JmsConnectionFactory("amqp://localhost:5660");
      ConnectionFactory cfServer1 = new JmsConnectionFactory("amqp://localhost:5661");

      try (Connection connection = cfServer0.createConnection()) {
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         Queue queue = session.createQueue("exampleQueue");
         MessageProducer producer = session.createProducer(queue);

         for (int i = 0; i < 100; i++) {
            producer.send(session.createTextMessage("Message " + i));
         }
      }

      // Every message send on server0, will be mirrored into server1
      try (Connection connection = cfServer1.createConnection()) {
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         Queue queue = session.createQueue("exampleQueue");
         connection.start();
         MessageConsumer consumer = session.createConsumer(queue);
         // we will consume only half of the messages on this server
         for (int i = 0; i < 50; i++) {
            TextMessage message = (TextMessage) consumer.receive(5000);
            System.out.println("Received Message on server1: " + message.getText());
            if (!message.getText().equals("Message " + i)) {
               // This is really not supposed to happen. We will throw an exception and in case it happens it needs to be investigated
               throw new IllegalStateException("Mirror Example is not working as expected");
            }
         }
      }

      // mirroring of acknowledgemnts are asynchronous They are fast but still asynchronous. So lets wait some time to let the ack be up to date between the servers
      // a few milliseconds would do, but I'm waiting a second just in case
      Thread.sleep(1000);

      // Every message send on server0, will be mirrored into server1
      try (Connection connection = cfServer0.createConnection()) {
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         Queue queue = session.createQueue("exampleQueue");
         connection.start();
         MessageConsumer consumer = session.createConsumer(queue);
         // we will consume only half of the messages on this server
         for (int i = 50; i < 100; i++) {
            TextMessage message = (TextMessage) consumer.receive(5000);
            System.out.println("Received Message on the original server0: " + message.getText());
            if (!message.getText().equals("Message " + i)) {
               // This is really not supposed to happen. We will throw an exception and in case it happens it needs to be investigated
               throw new IllegalStateException("Mirror Example is not working as expected");
            }
         }
      }
   }
}