/**
 * 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;

import java.util.concurrent.TimeUnit;

import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;

import org.apache.activemq.broker.BrokerRegistry;
import org.apache.activemq.broker.region.RegionBroker;
import org.apache.activemq.util.Wait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class OptimizedAckTest extends TestSupport {

   private static final Logger LOG = LoggerFactory.getLogger(OptimizedAckTest.class);
   private ActiveMQConnection connection;

   @Override
   protected void setUp() throws Exception {
      super.setUp();
      connection = (ActiveMQConnection) createConnection();
      connection.setOptimizeAcknowledge(true);
      connection.setOptimizeAcknowledgeTimeOut(0);
      ActiveMQPrefetchPolicy prefetchPolicy = new ActiveMQPrefetchPolicy();
      prefetchPolicy.setAll(10);
      connection.setPrefetchPolicy(prefetchPolicy);
   }

   @Override
   protected void tearDown() throws Exception {
      connection.close();
      super.tearDown();
   }

   public void testReceivedMessageStillInflight() throws Exception {
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue("test");
      MessageProducer producer = session.createProducer(queue);
      for (int i = 0; i < 10; i++) {
         producer.send(session.createTextMessage("Hello" + i));
      }

      final RegionBroker regionBroker = (RegionBroker) BrokerRegistry.getInstance().findFirst().getRegionBroker();
      MessageConsumer consumer = session.createConsumer(queue);

      assertTrue("prefetch full", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            LOG.info("inflight count: " + regionBroker.getDestinationStatistics().getInflight().getCount());
            return 10 == regionBroker.getDestinationStatistics().getInflight().getCount();
         }
      }));

      for (int i = 0; i < 6; i++) {
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);
         assertEquals("all prefetch is still in flight: " + i, 10, regionBroker.getDestinationStatistics().getInflight().getCount());
      }

      for (int i = 6; i < 10; i++) {
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);

         assertTrue("most are acked but 3 remain", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
               return 3 == regionBroker.getDestinationStatistics().getInflight().getCount();
            }
         }));
      }
   }

   public void testVerySlowReceivedMessageStillInflight() throws Exception {
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue("test");
      MessageProducer producer = session.createProducer(queue);
      for (int i = 0; i < 10; i++) {
         producer.send(session.createTextMessage("Hello" + i));
      }

      final RegionBroker regionBroker = (RegionBroker) BrokerRegistry.getInstance().findFirst().getRegionBroker();
      MessageConsumer consumer = session.createConsumer(queue);

      assertTrue("prefetch full", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            LOG.info("inflight count: " + regionBroker.getDestinationStatistics().getInflight().getCount());
            return 10 == regionBroker.getDestinationStatistics().getInflight().getCount();
         }
      }));

      for (int i = 0; i < 6; i++) {
         Thread.sleep(400);
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);
         assertEquals("all prefetch is still in flight: " + i, 10, regionBroker.getDestinationStatistics().getInflight().getCount());
      }

      for (int i = 6; i < 10; i++) {
         Thread.sleep(400);
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);

         assertTrue("most are acked but 3 remain", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
               return 3 == regionBroker.getDestinationStatistics().getInflight().getCount();
            }
         }));
      }

   }

   public void testReceivedMessageNotInFlightAfterScheduledAckFires() throws Exception {
      connection.setOptimizedAckScheduledAckInterval(TimeUnit.SECONDS.toMillis(10));
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Queue queue = session.createQueue("test");
      MessageProducer producer = session.createProducer(queue);
      for (int i = 0; i < 10; i++) {
         producer.send(session.createTextMessage("Hello" + i));
      }

      final RegionBroker regionBroker = (RegionBroker) BrokerRegistry.getInstance().findFirst().getRegionBroker();
      MessageConsumer consumer = session.createConsumer(queue);

      assertTrue("prefetch full", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            LOG.info("inflight count: " + regionBroker.getDestinationStatistics().getInflight().getCount());
            return 10 == regionBroker.getDestinationStatistics().getInflight().getCount();
         }
      }));

      for (int i = 0; i < 6; i++) {
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);
         assertEquals("all prefetch is still in flight: " + i, 10, regionBroker.getDestinationStatistics().getInflight().getCount());
      }

      for (int i = 6; i < 10; i++) {
         javax.jms.Message msg = consumer.receive(4000);
         assertNotNull(msg);
         assertTrue("most are acked but 3 remain", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
               return 3 == regionBroker.getDestinationStatistics().getInflight().getCount();
            }
         }));
      }

      assertTrue("After delay the scheduled ack should ack all inflight.", Wait.waitFor(new Wait.Condition() {
         @Override
         public boolean isSatisified() throws Exception {
            LOG.info("inflight count: " + regionBroker.getDestinationStatistics().getInflight().getCount());
            return 0 == regionBroker.getDestinationStatistics().getInflight().getCount();
         }
      }));
   }
}
