blob: 72dcef377d01e9ede1c475417bd7044eb8a33782 (
plain) (
blame)
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.util;
import com.yahoo.concurrent.ThreadLocalDirectory;
import com.yahoo.metrics.DoubleValue;
import com.yahoo.metrics.LongValue;
import com.yahoo.metrics.JoinBehavior;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
/**
* Value keeper class using ThreadLocalDirectory to maintain thread safety from multiple threads writing.
*/
public class ThreadLocalDirectoryValueKeeper<Value extends ValueType & HasCopy<Value>>
implements MetricValueKeeper<Value>, ThreadLocalDirectory.ObservableUpdater<Value, Value>
{
private final ThreadLocalDirectory<Value, Value> directory = new ThreadLocalDirectory<Value, Value>(this);
private List<Value> initialValues = null;
public ThreadLocalDirectoryValueKeeper() {
}
public ThreadLocalDirectoryValueKeeper(MetricValueKeeper<Value> other) {
initialValues = new LinkedList<Value>();
for (Value v : other.getDirectoryView()) initialValues.add(v.copyObject());
}
public Value createGenerationInstance(Value value) {
return null;
}
public Value update(Value current, Value newValue) {
if (current == null) {
if (newValue instanceof DoubleValue) {
current = (Value) new DoubleValue();
} else {
current = (Value) new LongValue();
}
}
current.add(newValue);
return current;
}
public Value copy(Value value) {
return value.copyObject();
}
public void add(Value v) {
directory.update(v, directory.getLocalInstance());
}
public void set(Value v) {
throw new UnsupportedOperationException("This value keeper is only intended to use with active metrics. Set operation not supported.");
}
public Value get(JoinBehavior joinBehavior) {
List<Value> values = directory.view();
if (initialValues != null) values.addAll(initialValues);
if (values.isEmpty()) {
return null;
}
return (Value) values.get(0).join(Collections.<ValueType>unmodifiableList(values), joinBehavior);
}
public void reset() {
directory.fetch();
initialValues = null;
}
public Collection<Value> getDirectoryView() {
return directory.view();
}
}
|