package org.apache.helix.monitoring.mbeans;
   
   /*
    * 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.
   */
  
  import org.apache.helix.monitoring.StatCollector;
  import org.apache.log4j.Logger;
  
  
  public class MessageQueueMonitor implements MessageQueueMonitorMBean
  {
    private static final Logger LOG = Logger.getLogger(MessageQueueMonitor.class);
  
    private final StatCollector _messageQueueSizeStat;
    private final String        _clusterName;
    private final String        _instanceName;
  
    public MessageQueueMonitor(String clusterName, String instanceName)
    {
      _clusterName = clusterName;
      _instanceName = instanceName;
      _messageQueueSizeStat = new StatCollector();
    }
  
  
    public void addMessageQueueSize(long size)
    {
      _messageQueueSizeStat.addData(size);
    }
  
    public void reset()
    {
      _messageQueueSizeStat.reset();
    }
  
    @Override
    public double getMaxMessageQueueSize()
    {
      return _messageQueueSizeStat.getMax();
    }
  
    @Override
    public double getMeanMessageQueueSize()
    {
      return _messageQueueSizeStat.getMean();
    }
  
    @Override
    public String getSensorName()
    {
      return ClusterStatusMonitor.MESSAGE_QUEUE_STATUS_KEY + "_" + _clusterName + "_"
          + _instanceName;
    }
  }