/**
 * 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 javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.MessageProducer;
import javax.jms.Session;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.jmx.QueueViewMBean;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.broker.region.RegionBroker;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AMQ4930Test extends TestCase {

   private static final Logger LOG = LoggerFactory.getLogger(AMQ4930Test.class);
   final int messageCount = 150;
   final int messageSize = 1024 * 1024;
   final int maxBrowsePageSize = 50;
   final ActiveMQQueue bigQueue = new ActiveMQQueue("BIG");
   BrokerService broker;
   ActiveMQConnectionFactory factory;

   protected void configureBroker() throws Exception {
      broker.setDeleteAllMessagesOnStartup(true);
      broker.setAdvisorySupport(false);
      broker.getSystemUsage().getMemoryUsage().setLimit(1 * 1024 * 1024);

      PolicyMap pMap = new PolicyMap();
      PolicyEntry policy = new PolicyEntry();
      // disable expriy processing as this will call browse in parallel
      policy.setExpireMessagesPeriod(0);
      policy.setMaxPageSize(maxBrowsePageSize);
      policy.setMaxBrowsePageSize(maxBrowsePageSize);
      pMap.setDefaultEntry(policy);

      broker.setDestinationPolicy(pMap);
   }

   public void testBrowsePendingNonPersistent() throws Exception {
      doTestBrowsePending(DeliveryMode.NON_PERSISTENT);
   }

   public void testBrowsePendingPersistent() throws Exception {
      doTestBrowsePending(DeliveryMode.PERSISTENT);
   }

   public void testWithStatsDisabled() throws Exception {
      ((RegionBroker) broker.getRegionBroker()).getDestinationStatistics().setEnabled(false);
      doTestBrowsePending(DeliveryMode.PERSISTENT);
   }

   public void doTestBrowsePending(int deliveryMode) throws Exception {

      Connection connection = factory.createConnection();
      connection.start();
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      MessageProducer producer = session.createProducer(bigQueue);
      producer.setDeliveryMode(deliveryMode);
      BytesMessage bytesMessage = session.createBytesMessage();
      bytesMessage.writeBytes(new byte[messageSize]);

      for (int i = 0; i < messageCount; i++) {
         producer.send(bigQueue, bytesMessage);
      }

      final QueueViewMBean queueViewMBean = (QueueViewMBean) broker.getManagementContext().newProxyInstance(broker.getAdminView().getQueues()[0], QueueViewMBean.class, false);

      LOG.info(queueViewMBean.getName() + " Size: " + queueViewMBean.getEnqueueCount());

      connection.close();

      assertFalse("Cache disabled on q", queueViewMBean.isCacheEnabled());

      // ensure repeated browse does now blow mem

      final Queue underTest = (Queue) ((RegionBroker) broker.getRegionBroker()).getQueueRegion().getDestinationMap().get(bigQueue);

      // do twice to attempt to pull in 2*maxBrowsePageSize which uses up the system memory limit
      Message[] browsed = underTest.browse();
      LOG.info("Browsed: " + browsed.length);
      assertEquals("maxBrowsePageSize", maxBrowsePageSize, browsed.length);
      browsed = underTest.browse();
      LOG.info("Browsed: " + browsed.length);
      assertEquals("maxBrowsePageSize", maxBrowsePageSize, browsed.length);
      Runtime.getRuntime().gc();
      long free = Runtime.getRuntime().freeMemory() / 1024;
      LOG.info("free at start of check: " + free);
      // check for memory growth
      for (int i = 0; i < 10; i++) {
         LOG.info("free: " + Runtime.getRuntime().freeMemory() / 1024);
         browsed = underTest.browse();
         LOG.info("Browsed: " + browsed.length);
         assertEquals("maxBrowsePageSize", maxBrowsePageSize, browsed.length);
         Runtime.getRuntime().gc();
         Runtime.getRuntime().gc();
         assertTrue("No growth: " + Runtime.getRuntime().freeMemory() / 1024 + " >= " + (free - (free * 0.2)), Runtime.getRuntime().freeMemory() / 1024 >= (free - (free * 0.2)));
      }
   }

   protected void setUp() throws Exception {
      super.setUp();
      broker = new BrokerService();
      broker.setBrokerName("thisOne");
      configureBroker();
      broker.start();
      factory = new ActiveMQConnectionFactory("vm://thisOne?jms.alwaysSyncSend=true");
      factory.setWatchTopicAdvisories(false);

   }

   protected void tearDown() throws Exception {
      super.tearDown();
      if (broker != null) {
         broker.stop();
         broker = null;
      }
   }

}