/**
 * 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.broker.scheduler;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import java.io.File;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ScheduledMessage;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.util.IOHelper;
import org.apache.log4j.BasicConfigurator;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class LostScheduledMessagesTest {

   private BrokerService broker;

   private static final File schedulerDirectory = new File("target/test/ScheduledDB");
   private static final File messageDirectory = new File("target/test/MessageDB");
   private static final String QUEUE_NAME = "test";

   @Before
   public void setup() throws Exception {
      IOHelper.mkdirs(schedulerDirectory);
      IOHelper.deleteChildren(schedulerDirectory);

      IOHelper.mkdirs(messageDirectory);
      IOHelper.deleteChildren(messageDirectory);
   }

   private void startBroker() throws Exception {
      broker = new BrokerService();
      broker.setSchedulerSupport(true);
      broker.setPersistent(true);
      broker.setDeleteAllMessagesOnStartup(false);
      broker.setDataDirectory("target");
      broker.setSchedulerDirectoryFile(schedulerDirectory);
      broker.setDataDirectoryFile(messageDirectory);
      broker.setUseJmx(false);
      broker.addConnector("vm://localhost");
      broker.start();
   }

   @After
   public void tearDown() throws Exception {
      broker.stop();
      BasicConfigurator.resetConfiguration();
   }

   @Test
   public void MessagePassedNotUsingScheduling() throws Exception {
      doTest(false);
   }

   @Test
   public void MessageLostWhenUsingScheduling() throws Exception {
      doTest(true);
   }

   private void doTest(boolean useScheduling) throws Exception {

      int DELIVERY_DELAY_MS = 5000;

      startBroker();

      long startTime = System.currentTimeMillis();

      // Send a message scheduled for delivery in 5 seconds
      ConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost");
      Connection connection = cf.createConnection();
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(session.createQueue(QUEUE_NAME));
      Message message = session.createTextMessage("test");
      if (useScheduling) {
         message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, DELIVERY_DELAY_MS);
      }
      producer.send(message);

      session.close();
      connection.close();

      broker.getServices();

      // shut down broker
      broker.stop();
      broker.waitUntilStopped();

      // Make sure that broker have stopped within delivery delay
      long shutdownTime = System.currentTimeMillis();
      assertTrue("Failed to shut down broker in expected time. Test results inconclusive", shutdownTime - startTime < DELIVERY_DELAY_MS);

      // make sure that delivery falls into down time window
      TimeUnit.MILLISECONDS.sleep(DELIVERY_DELAY_MS);

      // Start new broker instance
      startBroker();

      final AtomicLong receiveCounter = new AtomicLong();

      cf = new ActiveMQConnectionFactory("vm://localhost");
      connection = cf.createConnection();
      connection.start();
      session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

      MessageConsumer consumer = session.createConsumer(session.createQueue(QUEUE_NAME));
      consumer.setMessageListener(new MessageListener() {

         @Override
         public void onMessage(Message message) {
            receiveCounter.incrementAndGet();
         }
      });

      // Wait for a while to let MQ process the message
      TimeUnit.MILLISECONDS.sleep(DELIVERY_DELAY_MS * 2);

      session.close();
      connection.close();

      assertEquals(1, receiveCounter.get());
   }
}
