hbase-common/src/main/java/org/apache/hadoop/hbase/util/SimpleMovingAverage.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18
  19 package org.apache.hadoop.hbase.util;
  20
  21 import org.apache.yetus.audience.InterfaceAudience;
  22
  23 /**
  24  * SMA measure the overall average execution time of a specific method.
  25  */
  26 @InterfaceAudience.Private
  27 public class SimpleMovingAverage extends MovingAverage {
  28   private double averageTime = 0.0;
  29   protected long count = 0;
  30
  31   public SimpleMovingAverage(String label) {
  32     super(label);
  33     this.averageTime = 0.0;
  34     this.count = 0;
  35   }
  36
  37   @Override
  38   public void updateMostRecentTime(long elapsed) {
  39     averageTime += (elapsed - averageTime) / (++count);
  40   }
  41
  42   @Override
  43   public double getAverageTime() {
  44     return averageTime;
  45   }
  46 }