/**
 * 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.network;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import java.net.URI;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.concurrent.atomic.AtomicInteger;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.advisory.ConsumerEvent;
import org.apache.activemq.advisory.ConsumerEventSource;
import org.apache.activemq.advisory.ConsumerListener;
import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * These test cases are used to verifiy that network connections get re
 * established in all broker restart scenarios.
 *
 * @author chirino
 */
public class NetworkReconnectTest extends TestCase {

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

   private BrokerService producerBroker;
   private BrokerService consumerBroker;
   private ActiveMQConnectionFactory producerConnectionFactory;
   private ActiveMQConnectionFactory consumerConnectionFactory;
   private Destination destination;
   private ArrayList<Connection> connections = new ArrayList<>();

   public void xtestMultipleProducerBrokerRestarts() throws Exception {
      for (int i = 0; i < 10; i++) {
         testWithProducerBrokerRestart();
         disposeConsumerConnections();
      }
   }

   public void xtestWithoutRestarts() throws Exception {
      startProducerBroker();
      startConsumerBroker();

      MessageConsumer consumer = createConsumer();
      AtomicInteger counter = createConsumerCounter(producerConnectionFactory);
      waitForConsumerToArrive(counter);

      String messageId = sendMessage();
      Message message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());

      assertNull(consumer.receiveNoWait());

   }

   public void testWithProducerBrokerRestart() throws Exception {
      startProducerBroker();
      startConsumerBroker();

      MessageConsumer consumer = createConsumer();
      AtomicInteger counter = createConsumerCounter(producerConnectionFactory);
      waitForConsumerToArrive(counter);

      String messageId = sendMessage();
      Message message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());
      assertNull(consumer.receiveNoWait());

      // Restart the first broker...
      stopProducerBroker();
      startProducerBroker();

      counter = createConsumerCounter(producerConnectionFactory);
      waitForConsumerToArrive(counter);

      messageId = sendMessage();
      message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());
      assertNull(consumer.receiveNoWait());

   }

   public void xtestWithConsumerBrokerRestart() throws Exception {

      startProducerBroker();
      startConsumerBroker();

      MessageConsumer consumer = createConsumer();
      AtomicInteger counter = createConsumerCounter(producerConnectionFactory);
      waitForConsumerToArrive(counter);

      String messageId = sendMessage();
      Message message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());
      assertNull(consumer.receiveNoWait());

      // Restart the first broker...
      stopConsumerBroker();
      waitForConsumerToLeave(counter);
      startConsumerBroker();

      consumer = createConsumer();
      waitForConsumerToArrive(counter);

      messageId = sendMessage();
      message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());
      assertNull(consumer.receiveNoWait());

   }

   public void xtestWithConsumerBrokerStartDelay() throws Exception {

      startConsumerBroker();
      MessageConsumer consumer = createConsumer();

      Thread.sleep(1000 * 5);

      startProducerBroker();
      AtomicInteger counter = createConsumerCounter(producerConnectionFactory);
      waitForConsumerToArrive(counter);

      String messageId = sendMessage();
      Message message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());

      assertNull(consumer.receiveNoWait());

   }

   public void xtestWithProducerBrokerStartDelay() throws Exception {

      startProducerBroker();
      AtomicInteger counter = createConsumerCounter(producerConnectionFactory);

      Thread.sleep(1000 * 5);

      startConsumerBroker();
      MessageConsumer consumer = createConsumer();

      waitForConsumerToArrive(counter);

      String messageId = sendMessage();
      Message message = consumer.receive(1000);

      assertEquals(messageId, message.getJMSMessageID());

      assertNull(consumer.receiveNoWait());

   }

   @Override
   protected void setUp() throws Exception {

      LOG.info("===============================================================================");
      LOG.info("Running Test Case: " + getName());
      LOG.info("===============================================================================");

      producerConnectionFactory = createProducerConnectionFactory();
      consumerConnectionFactory = createConsumerConnectionFactory();
      destination = new ActiveMQQueue("RECONNECT.TEST.QUEUE");

   }

   @Override
   protected void tearDown() throws Exception {
      disposeConsumerConnections();
      try {
         stopProducerBroker();
      } catch (Throwable e) {
      }
      try {
         stopConsumerBroker();
      } catch (Throwable e) {
      }
   }

   protected void disposeConsumerConnections() {
      for (Iterator<Connection> iter = connections.iterator(); iter.hasNext(); ) {
         Connection connection = iter.next();
         try {
            connection.close();
         } catch (Throwable ignore) {
         }
      }
   }

   protected void startProducerBroker() throws Exception {
      if (producerBroker == null) {
         producerBroker = createFirstBroker();
         producerBroker.start();
      }
   }

   protected void stopProducerBroker() throws Exception {
      if (producerBroker != null) {
         producerBroker.stop();
         producerBroker = null;
      }
   }

   protected void startConsumerBroker() throws Exception {
      if (consumerBroker == null) {
         consumerBroker = createSecondBroker();
         consumerBroker.start();
      }
   }

   protected void stopConsumerBroker() throws Exception {
      if (consumerBroker != null) {
         consumerBroker.stop();
         consumerBroker = null;
      }
   }

   protected BrokerService createFirstBroker() throws Exception {
      return BrokerFactory.createBroker(new URI("xbean:org/apache/activemq/network/reconnect-broker1.xml"));
   }

   protected BrokerService createSecondBroker() throws Exception {
      return BrokerFactory.createBroker(new URI("xbean:org/apache/activemq/network/reconnect-broker2.xml"));
   }

   protected ActiveMQConnectionFactory createProducerConnectionFactory() {
      return new ActiveMQConnectionFactory("vm://broker1");
   }

   protected ActiveMQConnectionFactory createConsumerConnectionFactory() {
      return new ActiveMQConnectionFactory("vm://broker2");
   }

   protected String sendMessage() throws JMSException {
      Connection connection = null;
      try {
         connection = producerConnectionFactory.createConnection();
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         MessageProducer producer = session.createProducer(destination);
         Message message = session.createMessage();
         producer.send(message);
         return message.getJMSMessageID();
      } finally {
         try {
            connection.close();
         } catch (Throwable ignore) {
         }
      }
   }

   protected MessageConsumer createConsumer() throws JMSException {
      Connection connection = consumerConnectionFactory.createConnection();
      connections.add(connection);
      connection.start();

      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      return session.createConsumer(destination);
   }

   protected AtomicInteger createConsumerCounter(ActiveMQConnectionFactory cf) throws Exception {
      final AtomicInteger rc = new AtomicInteger(0);
      Connection connection = cf.createConnection();
      connections.add(connection);
      connection.start();

      ConsumerEventSource source = new ConsumerEventSource(connection, destination);
      source.setConsumerListener(new ConsumerListener() {
         @Override
         public void onConsumerEvent(ConsumerEvent event) {
            rc.set(event.getConsumerCount());
         }
      });
      source.start();

      return rc;
   }

   protected void waitForConsumerToArrive(AtomicInteger consumerCounter) throws InterruptedException {
      for (int i = 0; i < 100; i++) {
         if (consumerCounter.get() > 0) {
            return;
         }
         Thread.sleep(100);
      }
      fail("The consumer did not arrive.");
   }

   protected void waitForConsumerToLeave(AtomicInteger consumerCounter) throws InterruptedException {
      for (int i = 0; i < 100; i++) {
         if (consumerCounter.get() == 0) {
            return;
         }
         Thread.sleep(100);
      }
      fail("The consumer did not leave.");
   }

}
