/**
 * 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.broker.region.cursors;

import junit.framework.TestCase;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.DestinationStatistics;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTextMessage;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.store.MessageStore;
import org.apache.activemq.store.PersistenceAdapter;
import org.apache.activemq.usage.SystemUsage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author gtully
 *         https://issues.apache.org/activemq/browse/AMQ-2020
 */
public class StoreQueueCursorNoDuplicateTest extends TestCase {

   static final Logger LOG = LoggerFactory.getLogger(StoreQueueCursorNoDuplicateTest.class);
   ActiveMQQueue destination = new ActiveMQQueue("queue-" + StoreQueueCursorNoDuplicateTest.class.getSimpleName());
   BrokerService brokerService;

   final static String mesageIdRoot = "11111:22222:0:";
   final int messageBytesSize = 1024;
   final String text = new String(new byte[messageBytesSize]);

   protected int count = 6;

   @Override
   public void setUp() throws Exception {
      brokerService = createBroker();
      brokerService.setUseJmx(false);
      brokerService.deleteAllMessages();
      brokerService.start();
   }

   protected BrokerService createBroker() throws Exception {
      return new BrokerService();
   }

   @Override
   public void tearDown() throws Exception {
      brokerService.stop();
   }

   public void testNoDuplicateAfterCacheFullAndReadPast() throws Exception {
      final PersistenceAdapter persistenceAdapter = brokerService.getPersistenceAdapter();
      final MessageStore queueMessageStore = persistenceAdapter.createQueueMessageStore(destination);
      final ConsumerInfo consumerInfo = new ConsumerInfo();
      final DestinationStatistics destinationStatistics = new DestinationStatistics();
      consumerInfo.setExclusive(true);

      final Queue queue = new Queue(brokerService, destination, queueMessageStore, destinationStatistics, null);

      queueMessageStore.start();
      queueMessageStore.registerIndexListener(null);

      QueueStorePrefetch underTest = new QueueStorePrefetch(queue, brokerService.getBroker());
      SystemUsage systemUsage = new SystemUsage();
      // ensure memory limit is reached
      systemUsage.getMemoryUsage().setLimit(messageBytesSize * (count + 2));
      underTest.setSystemUsage(systemUsage);
      underTest.setEnableAudit(false);
      underTest.start();
      assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

      final ConnectionContext contextNotInTx = new ConnectionContext();
      for (int i = 0; i < count; i++) {
         ActiveMQTextMessage msg = getMessage(i);
         msg.setMemoryUsage(systemUsage.getMemoryUsage());

         queueMessageStore.addMessage(contextNotInTx, msg);
         underTest.addMessageLast(msg);
      }

      assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
      int dequeueCount = 0;

      underTest.setMaxBatchSize(2);
      underTest.reset();
      while (underTest.hasNext() && dequeueCount < count) {
         MessageReference ref = underTest.next();
         ref.decrementReferenceCount();
         underTest.remove();
         LOG.info("Received message: {} with body: {}", ref.getMessageId(), ((ActiveMQTextMessage) ref.getMessage()).getText());
         assertEquals(dequeueCount++, ref.getMessageId().getProducerSequenceId());
      }
      underTest.release();
      assertEquals(count, dequeueCount);
   }

   private ActiveMQTextMessage getMessage(int i) throws Exception {
      ActiveMQTextMessage message = new ActiveMQTextMessage();
      MessageId id = new MessageId(mesageIdRoot + i);
      id.setBrokerSequenceId(i);
      id.setProducerSequenceId(i);
      message.setMessageId(id);
      message.setDestination(destination);
      message.setPersistent(true);
      message.setResponseRequired(true);
      message.setText("Msg:" + i + " " + text);
      assertEquals(message.getMessageId().getProducerSequenceId(), i);
      return message;
   }
}
