blob: a110c6cf1117377b98286b8fa8e384333a19c3ea (
plain)
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
|
/*
* Copyright (C) 2012 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.cache;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Supplier;
import java.util.concurrent.atomic.AtomicLong;
/**
* Source of {@link LongAddable} objects that deals with GWT, Unsafe, and all
* that.
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
final class LongAddables {
private static final Supplier<LongAddable> SUPPLIER;
static {
Supplier<LongAddable> supplier;
try {
new LongAdder();
supplier = new Supplier<LongAddable>() {
@Override
public LongAddable get() {
return new LongAdder();
}
};
} catch (Throwable t) { // we really want to catch *everything*
supplier = new Supplier<LongAddable>() {
@Override
public LongAddable get() {
return new PureJavaLongAddable();
}
};
}
SUPPLIER = supplier;
}
public static LongAddable create() {
return SUPPLIER.get();
}
private static final class PureJavaLongAddable extends AtomicLong implements LongAddable {
@Override
public void increment() {
getAndIncrement();
}
@Override
public void add(long x) {
getAndAdd(x);
}
@Override
public long sum() {
return get();
}
}
}
|
