/**
 * 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.io.File;
import java.util.concurrent.CountDownLatch;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import junit.framework.Test;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQPrefetchPolicy;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.util.Wait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AMQ2314Test extends CombinationTestSupport {

   public boolean consumeAll = false;
   public int deliveryMode = DeliveryMode.NON_PERSISTENT;

   private static final Logger LOG = LoggerFactory.getLogger(AMQ2314Test.class);
   private static final int MESSAGES_COUNT = 30000;
   private static byte[] buf = new byte[1024];
   private BrokerService broker;
   private String connectionUri;

   private static final long messageReceiveTimeout = 500L;

   Destination destination = new ActiveMQTopic("FooTwo");

   public void testRemoveSlowSubscriberWhacksTempStore() throws Exception {
      runProducerWithHungConsumer();
   }

   public void testMemoryUsageReleasedOnAllConsumed() throws Exception {
      consumeAll = true;
      runProducerWithHungConsumer();
      // do it again to ensure memory limits are decreased
      runProducerWithHungConsumer();
   }

   public void runProducerWithHungConsumer() throws Exception {

      final CountDownLatch consumerContinue = new CountDownLatch(1);
      final CountDownLatch consumerReady = new CountDownLatch(1);

      final long origTempUsage = broker.getSystemUsage().getTempUsage().getUsage();

      ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(connectionUri);
      factory.setAlwaysSyncSend(true);

      // ensure messages are spooled to disk for this consumer
      ActiveMQPrefetchPolicy prefetch = new ActiveMQPrefetchPolicy();
      prefetch.setTopicPrefetch(500);
      factory.setPrefetchPolicy(prefetch);
      final Connection connection = factory.createConnection();
      connection.start();

      Thread producingThread = new Thread("Producing thread") {
         public void run() {
            try {
               Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
               MessageProducer producer = session.createProducer(destination);
               producer.setDeliveryMode(deliveryMode);
               for (int idx = 0; idx < MESSAGES_COUNT; ++idx) {
                  Message message = session.createTextMessage(new String(buf) + idx);
                  producer.send(message);
               }
               producer.close();
               session.close();
            }
            catch (Throwable ex) {
               ex.printStackTrace();
            }
         }
      };

      Thread consumingThread = new Thread("Consuming thread") {
         public void run() {
            try {
               int count = 0;
               Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
               MessageConsumer consumer = session.createConsumer(destination);

               while (consumer.receive(messageReceiveTimeout) == null) {
                  consumerReady.countDown();
               }
               count++;
               LOG.info("Received one... waiting");
               consumerContinue.await();
               if (consumeAll) {
                  LOG.info("Consuming the rest of the messages...");
                  while (consumer.receive(messageReceiveTimeout) != null) {
                     count++;
                  }
               }
               LOG.info("consumer session closing: consumed count: " + count);
               session.close();
            }
            catch (Throwable ex) {
               ex.printStackTrace();
            }
         }
      };
      consumingThread.start();
      consumerReady.await();

      producingThread.start();
      producingThread.join();

      final long tempUsageBySubscription = broker.getSystemUsage().getTempUsage().getUsage();
      LOG.info("Orig Usage: " + origTempUsage + ", currentUsage: " + tempUsageBySubscription);
      assertTrue("some temp store has been used", tempUsageBySubscription != origTempUsage);
      consumerContinue.countDown();
      consumingThread.join();
      connection.close();

      LOG.info("Subscription Usage: " + tempUsageBySubscription + ", endUsage: " + broker.getSystemUsage().getTempUsage().getUsage());

      assertTrue("temp usage decreased with removed sub", Wait.waitFor(new Wait.Condition() {
         public boolean isSatisified() throws Exception {
            return broker.getSystemUsage().getTempUsage().getUsage() < tempUsageBySubscription;
         }
      }));
   }

   public void setUp() throws Exception {
      super.setAutoFail(true);
      super.setUp();
      broker = new BrokerService();
      broker.setDataDirectory("target" + File.separator + "activemq-data");
      broker.setPersistent(true);
      broker.setUseJmx(true);
      broker.setAdvisorySupport(false);
      broker.setDeleteAllMessagesOnStartup(true);
      broker.getSystemUsage().getMemoryUsage().setLimit(1024L * 1024 * 64);

      broker.addConnector("tcp://localhost:0").setName("Default");
      broker.start();

      connectionUri = broker.getTransportConnectors().get(0).getPublishableConnectString();
   }

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

   public static Test suite() {
      return suite(AMQ2314Test.class);
   }
}
