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NoOpMeter 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  import java.util.concurrent.TimeUnit;
22  
23  /**
24   * An empty Metrics' Meter implementation that does nothing.
25   */
26  public class NoOpMeter extends Meter {
27    /** singleton instance for everyone to use */
28    public static final NoOpMeter INSTANCE = new NoOpMeter();
29  
30    /** do not instantiate */
31    private NoOpMeter() {
32      super(new NoOpExecutorService(), "", TimeUnit.SECONDS,
33            Clock.defaultClock());
34    }
35  
36    @Override
37    void tick() { }
38  
39    @Override
40    public void mark() { }
41  
42    @Override
43    public void mark(long n) { }
44  
45    @Override
46    public long count() { return 0; }
47  
48    @Override
49    public double fifteenMinuteRate() { return 0.0; }
50  
51    @Override
52    public double fiveMinuteRate() { return 0.0; }
53  
54    @Override
55    public double meanRate() { return 0.0; }
56  
57    @Override
58    public double oneMinuteRate() { return 0.0; }
59  
60    @Override
61    public void stop() { }
62  
63    @Override
64    public <T> void processWith(MetricProcessor<T> processor, MetricName name,
65                                T context)
66      throws Exception { }
67  }