/**
 * 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.store.kahadb.plist;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.*;
import org.apache.activemq.broker.region.cursors.FilePendingMessageCursor;
import org.apache.activemq.broker.region.cursors.FilePendingMessageCursorTestSupport;
import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.store.kahadb.disk.page.PageFile;
import org.apache.activemq.usage.SystemUsage;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

/**
 * @author <a href="http://hiramchirino.com">Hiram Chirino</a>
 */
public class KahaDBFilePendingMessageCursorTest extends FilePendingMessageCursorTestSupport {

   @Test
   public void testAddRemoveAddIndexSize() throws Exception {
      brokerService = new BrokerService();
      brokerService.setUseJmx(false);
      SystemUsage usage = brokerService.getSystemUsage();
      usage.getMemoryUsage().setLimit(1024 * 150);
      String body = new String(new byte[1024]);
      Destination destination = new Queue(brokerService, new ActiveMQQueue("Q"), null, new DestinationStatistics(), null);

      underTest = new FilePendingMessageCursor(brokerService.getBroker(), "test", false);
      underTest.setSystemUsage(usage);

      LOG.info("start");
      final PageFile pageFile = ((PListImpl) underTest.getDiskList()).getPageFile();
      LOG.info("page count: " + pageFile.getPageCount());
      LOG.info("free count: " + pageFile.getFreePageCount());
      LOG.info("content size: " + pageFile.getPageContentSize());

      final long initialPageCount = pageFile.getPageCount();

      final int numMessages = 1000;

      for (int j = 0; j < 10; j++) {
         // ensure free pages are reused
         for (int i = 0; i < numMessages; i++) {
            ActiveMQMessage mqMessage = new ActiveMQMessage();
            mqMessage.setStringProperty("body", body);
            mqMessage.setMessageId(new MessageId("1:2:3:" + i));
            mqMessage.setMemoryUsage(usage.getMemoryUsage());
            mqMessage.setRegionDestination(destination);
            underTest.addMessageLast(new IndirectMessageReference(mqMessage));
         }
         assertFalse("cursor is not full " + usage.getTempUsage(), underTest.isFull());

         underTest.reset();
         long receivedCount = 0;
         while (underTest.hasNext()) {
            MessageReference ref = underTest.next();
            underTest.remove();
            ref.decrementReferenceCount();
            assertEquals("id is correct", receivedCount++, ref.getMessageId().getProducerSequenceId());
         }
         assertEquals("got all messages back", receivedCount, numMessages);
         LOG.info("page count: " + pageFile.getPageCount());
         LOG.info("free count: " + pageFile.getFreePageCount());
         LOG.info("content size: " + pageFile.getPageContentSize());
      }

      assertEquals("expected page usage", initialPageCount, pageFile.getPageCount() - pageFile.getFreePageCount());

      LOG.info("Destroy");
      underTest.destroy();
      LOG.info("page count: " + pageFile.getPageCount());
      LOG.info("free count: " + pageFile.getFreePageCount());
      LOG.info("content size: " + pageFile.getPageContentSize());
      assertEquals("expected page usage", initialPageCount - 1, pageFile.getPageCount() - pageFile.getFreePageCount());
   }

}
