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NoOpCounter 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 com.yammer.metrics.core;
20  
21  /**
22   * A Metrics Counter implementation that does nothing
23   */
24  public class NoOpCounter extends Counter {
25    /** singleton instance for everyone to use */
26    public static final NoOpCounter INSTANCE = new NoOpCounter();
27  
28    /** do not instantiate */
29    private NoOpCounter() { }
30  
31    @Override
32    public void inc() { }
33  
34    @Override
35    public void inc(long n) { }
36  
37    @Override
38    public void dec() { }
39  
40    @Override
41    public void dec(long n) { }
42  
43    @Override
44    public long count() { return 0; }
45  
46    @Override
47    public void clear() { }
48  
49    @Override
50    public <T> void processWith(MetricProcessor<T> processor, MetricName name,
51                                T context)
52      throws Exception { }
53  }