/**
 * 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;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.Session;
import java.util.concurrent.CountDownLatch;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public class JmsSendWithAsyncCallbackTest extends TestSupport {

   private static final Logger LOG = LoggerFactory.getLogger(JmsSendWithAsyncCallbackTest.class);

   private Connection connection;

   @Override
   protected void setUp() throws Exception {
      super.setUp();
      connection = createConnection();
   }

   /**
    * @see junit.framework.TestCase#tearDown()
    */
   @Override
   protected void tearDown() throws Exception {
      if (connection != null) {
         connection.close();
         connection = null;
      }
      super.tearDown();
   }

   public void testAsyncCallbackIsFaster() throws JMSException, InterruptedException {
      connection.start();

      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue(getName());

      // setup a consumer to drain messages..
      MessageConsumer consumer = session.createConsumer(queue);
      consumer.setMessageListener(new MessageListener() {
         @Override
         public void onMessage(Message message) {
         }
      });

      // warmup...
      for (int i = 0; i < 10; i++) {
         benchmarkNonCallbackRate();
         benchmarkCallbackRate();
      }

      double callbackRate = benchmarkCallbackRate();
      double nonCallbackRate = benchmarkNonCallbackRate();

      LOG.info(String.format("AsyncCallback Send rate: %,.2f m/s", callbackRate));
      LOG.info(String.format("NonAsyncCallback Send rate: %,.2f m/s", nonCallbackRate));

      // The async style HAS to be faster than the non-async style..
      assertTrue("async rate[" + callbackRate + "] should beat non-async rate[" + nonCallbackRate + "]", callbackRate / nonCallbackRate > 1.5);
   }

   private double benchmarkNonCallbackRate() throws JMSException {
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue(getName());
      int count = 1000;
      ActiveMQMessageProducer producer = (ActiveMQMessageProducer) session.createProducer(queue);
      producer.setDeliveryMode(DeliveryMode.PERSISTENT);
      long start = System.currentTimeMillis();
      for (int i = 0; i < count; i++) {
         producer.send(session.createTextMessage("Hello"));
      }
      return 1000.0 * count / (System.currentTimeMillis() - start);
   }

   private double benchmarkCallbackRate() throws JMSException, InterruptedException {
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue(getName());
      int count = 1000;
      final CountDownLatch messagesSent = new CountDownLatch(count);
      ActiveMQMessageProducer producer = (ActiveMQMessageProducer) session.createProducer(queue);
      producer.setDeliveryMode(DeliveryMode.PERSISTENT);
      long start = System.currentTimeMillis();
      for (int i = 0; i < count; i++) {
         producer.send(session.createTextMessage("Hello"), new AsyncCallback() {
            @Override
            public void onSuccess() {
               messagesSent.countDown();
            }

            @Override
            public void onException(JMSException exception) {
               exception.printStackTrace();
            }
         });
      }
      messagesSent.await();
      return 1000.0 * count / (System.currentTimeMillis() - start);
   }
}
