ProducerRateLimitExample.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.activemq.artemis.api.jms.ActiveMQJMSClient;
import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;

/**
 * This example demonstrates how a message producer can be limited to produce messages at a maximum rate
 * specified in messages per sec.
 */
public class ProducerRateLimitExample {

   public static void main(final String[] args) throws Exception {
      Connection connection = null;
      try {
         // Step 2. Perfom a lookup on the queue
         Queue queue = ActiveMQJMSClient.createQueue("exampleQueue");

         // Step 3. Perform a lookup on the Connection Factory
         ConnectionFactory cf = new ActiveMQConnectionFactory("tcp://localhost:61616?producerMaxRate=50");

         // Step 4. Create a JMS Connection
         connection = cf.createConnection();

         // Step 5. Create a JMS Session
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

         // Step 6. Create a JMS Message Producer
         MessageProducer producer = session.createProducer(queue);

         System.out.println("Will now send as many messages as we can in 10 seconds...");

         // Step 7. Send as many messages as we can in 10 seconds

         final long duration = 10000;

         int i = 0;

         long start = System.currentTimeMillis();

         while (System.currentTimeMillis() - start <= duration) {
            TextMessage message = session.createTextMessage("This is text message: " + i++);

            producer.send(message);
         }

         long end = System.currentTimeMillis();

         double rate = 1000 * (double) i / (end - start);

         System.out.println("We sent " + i + " messages in " + (end - start) + " milliseconds");

         System.out.println("Actual send rate was " + rate + " messages per second");

         // Step 8. For good measure we consumer the messages we produced.

         MessageConsumer messageConsumer = session.createConsumer(queue);

         connection.start();

         System.out.println("Now consuming the messages...");

         i = 0;
         while (true) {
            TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);

            if (messageReceived == null) {
               break;
            }

            i++;
         }

         System.out.println("Received " + i + " messages");
      } finally {
         // Step 9. Be sure to close our resources!
         if (connection != null) {
            connection.close();
         }
      }
   }
}