1
14
15 package com.liferay.portal.kernel.concurrent;
16
17 import java.util.concurrent.ConcurrentHashMap;
18 import java.util.concurrent.ConcurrentMap;
19 import java.util.concurrent.locks.Lock;
20 import java.util.concurrent.locks.ReadWriteLock;
21 import java.util.concurrent.locks.ReentrantReadWriteLock;
22
23
37 public class ReadWriteLockRegistry {
38
39 public Lock acquireLock(ReadWriteLockKey<?> readWriteLockKey) {
40 ReadWriteLock readWriteLock = _readWriteLockMap.get(readWriteLockKey);
41
42 if (readWriteLock == null) {
43 ReadWriteLock newReadWriteLock = new ReentrantReadWriteLock();
44
45 readWriteLock = _readWriteLockMap.putIfAbsent(
46 readWriteLockKey, newReadWriteLock);
47
48 if (readWriteLock == null) {
49 readWriteLock = newReadWriteLock;
50 }
51 }
52
53 if (readWriteLockKey.isWriteLock()) {
54 return readWriteLock.writeLock();
55 }
56 else {
57 return readWriteLock.readLock();
58 }
59 }
60
61 public void releaseLock(ReadWriteLockKey<?> readWriteLockKey) {
62 if (readWriteLockKey.isWriteLock()) {
63 _readWriteLockMap.remove(readWriteLockKey);
64 }
65 }
66
67 private ConcurrentMap<ReadWriteLockKey<?>, ReadWriteLock>
68 _readWriteLockMap = new ConcurrentHashMap
69 <ReadWriteLockKey<?>, ReadWriteLock>();
70
71 }