blob: 2a6d9c145dea143e484155c3f73252448e745123 (
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
|
/**
* Copyright 2009 Google Inc.
*
* 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 net.appjet.oui;
class Synchronizer {
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.ConcurrentHashMap;
private val lockMap = new ConcurrentHashMap[Object, Lock];
private val monitor = new Object {};
private class Lock {
var users = 0;
val impl = new ReentrantLock;
}
def acquire(key: Object) {
val lock = monitor.synchronized {
var lck = lockMap.get(key);
if (lck == null) {
lck = new Lock;
lockMap.put(key, lck);
}
lck.users += 1;
lck;
}
lock.impl.lock();
}
def isHeld(key: Object): Boolean = {
monitor.synchronized {
val lck = lockMap.get(key);
if (lck == null) {
false;
}
else {
lck.impl.isLocked;
}
}
}
def release(key: Object) {
val lock = monitor.synchronized {
var lck = lockMap.get(key);
lck.users -= 1;
if (lck.users == 0) {
lockMap.remove(key);
}
lck;
}
lock.impl.unlock();
}
}
object GlobalSynchronizer extends Synchronizer;
|