/**
 * 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.transport.failover;

import java.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerPlugin;
import org.apache.activemq.broker.BrokerPluginSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.MessagePull;
import org.apache.activemq.command.Response;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.junit.After;
import org.junit.Test;

import static org.junit.Assert.assertTrue;

// see: https://issues.apache.org/activemq/browse/AMQ-2877
public class FailoverPrefetchZeroTest {

   private static final Logger LOG = LoggerFactory.getLogger(FailoverPrefetchZeroTest.class);
   private static final String QUEUE_NAME = "FailoverPrefetchZero";
   private static final String TRANSPORT_URI = "tcp://localhost:0";
   private String url;
   final int prefetch = 0;
   BrokerService broker;

   @After
   public void stopBroker() throws Exception {
      if (broker != null) {
         broker.stop();
      }
   }

   public void startBroker(boolean deleteAllMessagesOnStartup) throws Exception {
      broker = createBroker(deleteAllMessagesOnStartup);
      broker.start();
   }

   public BrokerService createBroker(boolean deleteAllMessagesOnStartup) throws Exception {
      return createBroker(deleteAllMessagesOnStartup, TRANSPORT_URI);
   }

   public BrokerService createBroker(boolean deleteAllMessagesOnStartup, String bindAddress) throws Exception {
      broker = new BrokerService();
      broker.addConnector(bindAddress);
      broker.setDeleteAllMessagesOnStartup(deleteAllMessagesOnStartup);

      url = broker.getTransportConnectors().get(0).getConnectUri().toString();

      return broker;
   }

   @SuppressWarnings("unchecked")
   @Test
   public void testPrefetchZeroConsumerThroughRestart() throws Exception {
      broker = createBroker(true);

      final CountDownLatch pullDone = new CountDownLatch(1);
      broker.setPlugins(new BrokerPlugin[]{new BrokerPluginSupport() {
         @Override
         public Response messagePull(ConnectionContext context, final MessagePull pull) throws Exception {
            context.setDontSendReponse(true);
            pullDone.countDown();
            Executors.newSingleThreadExecutor().execute(new Runnable() {
               public void run() {
                  LOG.info("Stopping broker on pull: " + pull);
                  try {
                     broker.stop();
                  }
                  catch (Exception e) {
                     e.printStackTrace();
                  }
               }
            });
            return null;
         }
      }});
      broker.start();

      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("failover:(" + url + ")");
      cf.setWatchTopicAdvisories(false);

      final ActiveMQConnection connection = (ActiveMQConnection) cf.createConnection();
      connection.start();

      final Session consumerSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      final Queue destination = consumerSession.createQueue(QUEUE_NAME + "?consumer.prefetchSize=" + prefetch);

      final MessageConsumer consumer = consumerSession.createConsumer(destination);
      produceMessage(consumerSession, destination, 1);

      final CountDownLatch receiveDone = new CountDownLatch(1);
      final Vector<Message> received = new Vector<Message>();
      Executors.newSingleThreadExecutor().execute(new Runnable() {
         public void run() {
            try {
               LOG.info("receive one...");
               Message msg = consumer.receive(30000);
               if (msg != null) {
                  received.add(msg);
               }
               receiveDone.countDown();
               LOG.info("done receive");
            }
            catch (Exception e) {
               e.printStackTrace();
            }
         }
      });

      // will be stopped by the plugin
      assertTrue("pull completed on broker", pullDone.await(30, TimeUnit.SECONDS));
      broker.waitUntilStopped();
      broker = createBroker(false, url);
      broker.start();

      assertTrue("receive completed through failover", receiveDone.await(30, TimeUnit.SECONDS));

      assertTrue("we got our message:", !received.isEmpty());

      connection.close();
   }

   private void produceMessage(final Session producerSession, Queue destination, long count) throws JMSException {
      MessageProducer producer = producerSession.createProducer(destination);
      for (int i = 0; i < count; i++) {
         TextMessage message = producerSession.createTextMessage("Test message " + i);
         producer.send(message);
      }
      producer.close();
   }
}
