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 }