1 /***
2 *
3 * Copyright 2005 LogicBlaze, Inc. http://www.logicblaze.com
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.logicblaze.lingo.util.locks;
19
20 import edu.emory.mathcs.backport.java.util.concurrent.locks.Condition;
21 import edu.emory.mathcs.backport.java.util.concurrent.locks.Lock;
22 import edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock;
23
24 import java.util.HashMap;
25 import java.util.Map;
26
27 /***
28 * Represents a client side {@link ConditionManager} which is used to
29 * communicate with a possibly remote {@link ConditionServer}
30 *
31 * @version $Revision$
32 */
33 public class ConditionManagerImpl implements ConditionListener, ConnectionManager {
34
35 private ConditionServer server;
36 private Map map = new HashMap();
37
38 /***
39 * Gets the condition for the given ID lazily creating one if required.
40 */
41 public Condition getCondition(String id) {
42 synchronized (map) {
43 ConditionClient client = (ConditionClient) map.get(id);
44 if (client == null) {
45 client = createCondition(id);
46 map.put(id, client);
47 }
48 return client;
49 }
50 }
51
52 /***
53 * Removes the condition of the given ID
54 */
55 public boolean removeCondition(String id) {
56 synchronized (map) {
57 return map.remove(id) != null;
58 }
59 }
60
61 public void onSignal(String id) {
62 synchronized (map) {
63 ConditionClient client = (ConditionClient) map.get(id);
64 if (client != null) {
65 client.onSignal();
66 }
67 }
68 }
69
70 public void onSignalAll(String id) {
71 ConditionClient client = (ConditionClient) map.get(id);
72 if (client != null) {
73 client.onSignalAll();
74 }
75 }
76
77
78
79
80 /***
81 * Factory method to create a new condition
82 */
83 protected ConditionClient createCondition(String id) {
84 return new ConditionClient(server, this, id, createLock(id));
85 }
86
87 /***
88 * Factory method to change a lock
89 */
90 protected Lock createLock(String id) {
91 return new ReentrantLock();
92 }
93 }