/**
 * 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.bugs;

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

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.store.kahadb.KahaDBStore;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class AMQ2983Test {

   private static final int MAX_CONSUMER = 10;

   private static final int MAX_MESSAGES = 2000;

   private static final String QUEUE_NAME = "test.queue";

   private BrokerService broker;

   private final CountDownLatch messageCountDown = new CountDownLatch(MAX_MESSAGES);

   private CleanableKahaDBStore kahaDB;

   private static class CleanableKahaDBStore extends KahaDBStore {

      // make checkpoint cleanup accessible
      public void forceCleanup() throws IOException {
         checkpointCleanup(true);
      }

      public int getFileMapSize() throws IOException {
         // ensure save memory publishing, use the right lock
         indexLock.readLock().lock();
         try {
            return getJournal().getFileMap().size();
         }
         finally {
            indexLock.readLock().unlock();
         }
      }
   }

   private class ConsumerThread extends Thread {

      @Override
      public void run() {
         try {
            ConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");
            Connection connection = factory.createConnection();
            connection.start();
            Session session = connection.createSession(true, Session.SESSION_TRANSACTED);
            MessageConsumer consumer = session.createConsumer(session.createQueue(QUEUE_NAME));
            do {
               Message message = consumer.receive(200);
               if (message != null) {
                  session.commit();
                  messageCountDown.countDown();
               }
            } while (messageCountDown.getCount() != 0);
            consumer.close();
            session.close();
            connection.close();
         }
         catch (Exception e) {
            Assert.fail(e.getMessage());
         }
      }
   }

   @Before
   public void setup() throws Exception {

      broker = new BrokerService();
      broker.setDeleteAllMessagesOnStartup(true);
      broker.setPersistent(true);

      kahaDB = new CleanableKahaDBStore();
      kahaDB.setJournalMaxFileLength(256 * 1024);
      broker.setPersistenceAdapter(kahaDB);

      broker.start();
      broker.waitUntilStarted();
   }

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

   @Test
   public void testNoStickyKahaDbLogFilesOnConcurrentTransactionalConsumer() throws Exception {

      List<Thread> consumerThreads = new ArrayList<Thread>();
      for (int i = 0; i < MAX_CONSUMER; i++) {
         ConsumerThread thread = new ConsumerThread();
         thread.start();
         consumerThreads.add(thread);
      }
      sendMessages();

      boolean allMessagesReceived = messageCountDown.await(60, TimeUnit.SECONDS);
      assertTrue(allMessagesReceived);

      for (Thread thread : consumerThreads) {
         thread.join(TimeUnit.MILLISECONDS.convert(60, TimeUnit.SECONDS));
         assertFalse(thread.isAlive());
      }
      kahaDB.forceCleanup();
      assertEquals("Expect only one active KahaDB log file after cleanup", 1, kahaDB.getFileMapSize());
   }

   private void sendMessages() throws Exception {
      ConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");
      Connection connection = factory.createConnection();
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(session.createQueue(QUEUE_NAME));
      producer.setDeliveryMode(DeliveryMode.PERSISTENT);
      for (int i = 0; i < MAX_MESSAGES; i++) {
         BytesMessage message = session.createBytesMessage();
         message.writeBytes(new byte[200]);
         producer.send(message);
      }
      producer.close();
      session.close();
      connection.close();
   }

}
