/**
 * 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.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerRegistry;
import org.apache.activemq.broker.BrokerService;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class AMQ5136Test {

   BrokerService brokerService;

   @Before
   public void startBroker() throws Exception {
      brokerService = new BrokerService();
      brokerService.setPersistent(false);
      brokerService.start();
   }

   @After
   public void stopBroker() throws Exception {
      brokerService.stop();
   }

   @Test
   public void memoryUsageOnCommit() throws Exception {
      sendMessagesAndAssertMemoryUsage(new TransactionHandler() {
         @Override
         public void finishTransaction(Session session) throws JMSException {
            session.commit();
         }
      });
   }

   @Test
   public void memoryUsageOnRollback() throws Exception {
      sendMessagesAndAssertMemoryUsage(new TransactionHandler() {
         @Override
         public void finishTransaction(Session session) throws JMSException {
            session.rollback();
         }
      });
   }

   private void sendMessagesAndAssertMemoryUsage(TransactionHandler transactionHandler) throws Exception {
      ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("vm://localhost");
      Connection connection = connectionFactory.createConnection();
      Session session = connection.createSession(true, Session.SESSION_TRANSACTED);
      Topic destination = session.createTopic("ActiveMQBug");
      MessageProducer producer = session.createProducer(destination);
      for (int i = 0; i < 100; i++) {
         BytesMessage message = session.createBytesMessage();
         message.writeBytes(generateBytes());
         producer.send(message);
         transactionHandler.finishTransaction(session);
      }
      connection.close();
      org.junit.Assert.assertEquals(0, BrokerRegistry.getInstance().findFirst().getSystemUsage().getMemoryUsage().getPercentUsage());
   }

   private byte[] generateBytes() {
      byte[] bytes = new byte[100000];
      for (int i = 0; i < 100000; i++) {
         bytes[i] = (byte) i;
      }
      return bytes;
   }

   private static interface TransactionHandler {

      void finishTransaction(Session session) throws JMSException;
   }
}
