/*
    * 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;
    }
  }