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AggregatedMetricDouble xref
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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.giraph.metrics;
20  
21  /**
22   * Aggregator over metrics with double values
23   */
24  public final class AggregatedMetricDouble extends AggregatedMetric<Double> {
25    /**
26     * Constructor
27     */
28    public AggregatedMetricDouble() {
29      min = new ValueWithHostname<>(Double.MAX_VALUE);
30      max = new ValueWithHostname<>(Double.MIN_VALUE);
31      sum = 0.0;
32    }
33  
34    @Override
35    public void addItem(Double value, String hostnamePartitionId) {
36      if (value < min.getValue()) {
37        min.set(value, hostnamePartitionId);
38      }
39      if (value > max.getValue()) {
40        max.set(value, hostnamePartitionId);
41      }
42      sum += value;
43      count++;
44    }
45  
46    @Override
47    public double mean() {
48      return sum / count;
49    }
50  }