/**
 * 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 java.net.URI;
import java.util.Random;
import java.util.concurrent.CountDownLatch;

import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQMessageConsumer;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.broker.region.policy.SharedDeadLetterStrategy;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.store.PersistenceAdapter;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AMQ3436Test {

   protected static final Logger LOG = LoggerFactory.getLogger(AMQ3436Test.class);

   private BrokerService broker;
   private PersistenceAdapter adapter;
   private boolean useCache = true;
   private boolean prioritizeMessages = true;

   protected PersistenceAdapter createPersistenceAdapter(boolean delete) throws Exception {
      KahaDBPersistenceAdapter adapter = new KahaDBPersistenceAdapter();
      adapter.setConcurrentStoreAndDispatchQueues(false);
      adapter.setConcurrentStoreAndDispatchTopics(false);
      adapter.deleteAllMessages();
      return adapter;
   }

   @Before
   public void setUp() throws Exception {
      broker = new BrokerService();
      broker.setBrokerName("priorityTest");
      broker.setAdvisorySupport(false);
      broker.setUseJmx(false);
      adapter = createPersistenceAdapter(true);
      broker.setPersistenceAdapter(adapter);
      PolicyEntry policy = new PolicyEntry();
      policy.setPrioritizedMessages(prioritizeMessages);
      policy.setUseCache(useCache);
      policy.setProducerFlowControl(false);
      PolicyMap policyMap = new PolicyMap();
      policyMap.put(new ActiveMQQueue("TEST"), policy);

      // do not process expired for one test
      PolicyEntry ignoreExpired = new PolicyEntry();
      SharedDeadLetterStrategy ignoreExpiredStrategy = new SharedDeadLetterStrategy();
      ignoreExpiredStrategy.setProcessExpired(false);
      ignoreExpired.setDeadLetterStrategy(ignoreExpiredStrategy);

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

   protected void tearDown() throws Exception {
      broker.stop();
      broker.waitUntilStopped();
   }

   @Test
   public void testPriorityWhenConsumerCreatedBeforeProduction() throws Exception {

      int messageCount = 200;
      URI failoverUri = new URI("vm://priorityTest?jms.prefetchPolicy.all=1");

      ActiveMQQueue dest = new ActiveMQQueue("TEST?consumer.dispatchAsync=false");

      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory(failoverUri);
      cf.setDispatchAsync(false);

      // Create producer
      ActiveMQConnection producerConnection = (ActiveMQConnection) cf.createConnection();
      producerConnection.setMessagePrioritySupported(true);
      producerConnection.start();
      final Session producerSession = producerConnection.createSession(true, Session.SESSION_TRANSACTED);
      MessageProducer producer = producerSession.createProducer(dest);

      ActiveMQMessageConsumer consumer;

      // Create consumer on separate connection
      ActiveMQConnection consumerConnection = (ActiveMQConnection) cf.createConnection();
      consumerConnection.setMessagePrioritySupported(true);
      consumerConnection.start();
      final ActiveMQSession consumerSession = (ActiveMQSession) consumerConnection.createSession(true, Session.SESSION_TRANSACTED);
      consumer = (ActiveMQMessageConsumer) consumerSession.createConsumer(dest);

      // Produce X number of messages with a session commit after each message
      Random random = new Random();
      for (int i = 0; i < messageCount; ++i) {

         Message message = producerSession.createTextMessage("Test message #" + i);
         producer.send(message, DeliveryMode.PERSISTENT, random.nextInt(10), 45 * 1000);
         producerSession.commit();
      }
      producer.close();

      // ***************************************************
      // If we create the consumer here instead of above, the
      // the messages will be consumed in priority order
      // ***************************************************
      //consumer = (ActiveMQMessageConsumer) consumerSession.createConsumer(dest);

      // Consume all of the messages we produce using a listener.
      // Don't exit until we get all the messages.
      final CountDownLatch latch = new CountDownLatch(messageCount);
      final StringBuffer failureMessage = new StringBuffer();
      consumer.setMessageListener(new MessageListener() {
         int lowestPrioritySeen = 10;

         boolean firstMessage = true;

         public void onMessage(Message msg) {
            try {

               int currentPriority = msg.getJMSPriority();
               LOG.debug(currentPriority + "<=" + lowestPrioritySeen);

               // Ignore the first message priority since it is prefetched
               // and is out of order by design
               if (firstMessage == true) {
                  firstMessage = false;
                  LOG.debug("Ignoring first message since it was prefetched");

               }
               else {

                  // Verify that we never see a priority higher than the
                  // lowest
                  // priority seen
                  if (lowestPrioritySeen > currentPriority) {
                     lowestPrioritySeen = currentPriority;
                  }
                  if (lowestPrioritySeen < currentPriority) {
                     failureMessage.append("Incorrect priority seen (Lowest Priority = " + lowestPrioritySeen + " Current Priority = " + currentPriority + ")" + System.getProperty("line.separator"));
                  }
               }

            }
            catch (JMSException e) {
               e.printStackTrace();
            }
            finally {
               latch.countDown();
               LOG.debug("Messages remaining = " + latch.getCount());
            }
         }
      });

      latch.await();
      consumer.close();

      // Cleanup producer resources
      producerSession.close();
      producerConnection.stop();
      producerConnection.close();

      // Cleanup consumer resources
      consumerSession.close();
      consumerConnection.stop();
      consumerConnection.close();

      // Report the failure if found
      if (failureMessage.length() > 0) {
         Assert.fail(failureMessage.toString());
      }
   }
}
