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 package org.apache.hadoop.hbase.metrics.impl;
19
20 import org.apache.hadoop.hbase.classification.InterfaceAudience;
21 import org.apache.hadoop.hbase.metrics.Counter;
22 import org.apache.hadoop.hbase.util.LongAdder;
23
24 /**
25 * Custom implementation of {@link org.apache.hadoop.hbase.metrics.Counter} using LongAdder.
26 */
27 @InterfaceAudience.Private
28 public class CounterImpl implements Counter {
29
30 private final LongAdder counter;
31
32 public CounterImpl() {
33 this.counter = new LongAdder();
34 }
35
36 @Override
37 public void increment() {
38 this.counter.increment();
39 }
40
41 @Override
42 public void increment(long n) {
43 this.counter.add(n);
44 }
45
46 @Override
47 public void decrement() {
48 this.counter.decrement();
49 }
50
51 @Override
52 public void decrement(long n) {
53 this.counter.add(-n);
54 }
55
56 @Override
57 public long getCount() {
58 return this.counter.sum();
59 }
60 }