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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.catalina;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* Interface implemented by {@link WebResourceSet} implementations that wish to provide locking functionality.
*/
public interface WebResourceLockSet {
/**
* Lock the resource at the provided path for reading. The resource is not required to exist. Read locks are not
* exclusive.
*
* @param path The path to the resource to be locked for reading
*
* @return The {@link ResourceLock} that must be passed to {@link #unlockForRead(ResourceLock)} to release the lock
*/
ResourceLock lockForRead(String path);
/**
* Release a read lock from the resource associated with the given {@link ResourceLock}.
*
* @param resourceLock The {@link ResourceLock} associated with the resource for which a read lock should be
* released
*/
void unlockForRead(ResourceLock resourceLock);
/**
* Lock the resource at the provided path for writing. The resource is not required to exist. Write locks are
* exclusive.
*
* @param path The path to the resource to be locked for writing
*
* @return The {@link ResourceLock} that must be passed to {@link #unlockForWrite(ResourceLock)} to release the lock
*/
ResourceLock lockForWrite(String path);
/**
* Release the write lock from the resource associated with the given {@link ResourceLock}.
*
* @param resourceLock The {@link ResourceLock} associated with the resource for which the write lock should be
* released
*/
void unlockForWrite(ResourceLock resourceLock);
class ResourceLock {
public final AtomicInteger count = new AtomicInteger(0);
public final ReentrantReadWriteLock reentrantLock = new ReentrantReadWriteLock();
public final String key;
public ResourceLock(String key) {
this.key = key;
}
}
}
|
