docproc/src/main/java/com/yahoo/docproc/jdisc/metric/NullMetric.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.docproc.jdisc.metric;

import com.yahoo.jdisc.Metric;

import java.util.Map;

/**
 * @author Einar M R Rosenvinge
 */
public class NullMetric implements Metric {

    @Override
    public void set(String key, Number val, Context ctx) {
    }

    @Override
    public void add(String key, Number val, Context ctx) {
    }

    @Override
    public Context createContext(Map<String, ?> properties) {
        return NullContext.INSTANCE;
    }

    private static class NullContext implements Context {
        private static final NullContext INSTANCE = new NullContext();
    }

}