001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import org.apache.yetus.audience.InterfaceAudience;
021
022/**
023 * SMA measure the overall average execution time of a specific method.
024 */
025@InterfaceAudience.Private
026public class SimpleMovingAverage extends MovingAverage {
027  private double averageTime = 0.0;
028  protected long count = 0;
029
030  public SimpleMovingAverage(String label) {
031    super(label);
032    this.averageTime = 0.0;
033    this.count = 0;
034  }
035
036  @Override
037  public void updateMostRecentTime(long elapsed) {
038    averageTime += (elapsed - averageTime) / (++count);
039  }
040
041  @Override
042  public double getAverageTime() {
043    return averageTime;
044  }
045}