/*

  * 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.giraph.metrics;

 /**

  * Aggregator over metrics with double values

  */

 public final class AggregatedMetricDouble extends AggregatedMetric<Double> {

   /**

    * Constructor

    */

   public AggregatedMetricDouble() {

     min = new ValueWithHostname<>(Double.MAX_VALUE);

     max = new ValueWithHostname<>(Double.MIN_VALUE);

     sum = 0.0;

   }

   @Override

   public void addItem(Double value, String hostnamePartitionId) {

     if (value < min.getValue()) {

       min.set(value, hostnamePartitionId);

     }

     if (value > max.getValue()) {

       max.set(value, hostnamePartitionId);

     }

     sum += value;

     count++;

   }

   @Override

   public double mean() {

     return sum / count;

   }

 }