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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.hadoop.metrics2.lib;
20  
21  import java.util.concurrent.atomic.AtomicLongArray;
22  
23  import org.apache.hadoop.hbase.classification.InterfaceAudience;
24  import org.apache.hadoop.metrics2.MetricsInfo;
25  
26  /**
27   * Extended histogram implementation with counters for metric time ranges.
28   */
29  @InterfaceAudience.Private
30  public class MutableTimeHistogram extends MutableRangeHistogram {
31    private final String rangeType = "TimeRangeCount";
32    private final long[] ranges =
33        { 1, 3, 10, 30, 100, 300, 1000, 3000, 10000, 30000, 60000, 120000, 300000, 600000 };
34    private final AtomicLongArray rangeVals = new AtomicLongArray(ranges.length+1);
35  
36    public MutableTimeHistogram(MetricsInfo info) {
37      this(info.name(), info.description());
38    }
39  
40    public MutableTimeHistogram(String name, String description) {
41      super(name, description);
42    }
43  
44    @Override
45    public String getRangeType() {
46      return rangeType;
47    }
48  
49    @Override
50    public long[] getRange() {
51      return ranges;
52    }
53  
54    @Override
55    public AtomicLongArray getRangeVals() {
56      return rangeVals;
57    } 
58  }