1 /***
2 *
3 * Copyright 2003-2005 Core Developers Network Ltd.
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 package org.codehaus.wadi.core.motable;
18
19 import java.util.concurrent.locks.ReadWriteLock;
20 import java.util.concurrent.locks.ReentrantReadWriteLock;
21
22 import org.codehaus.wadi.core.eviction.SimpleEvictable;
23 import org.codehaus.wadi.core.eviction.SimpleEvictableMemento;
24
25 /***
26 * Implement all of Motable except for the Bytes field. This is the field most likely to have different representations.
27 *
28 * @author <a href="mailto:jules@coredevelopers.net">Jules Gosnell</a>
29 * @version $Revision: 2244 $
30 */
31 public abstract class AbstractMotable extends SimpleEvictable implements Motable {
32 protected ReadWriteLock readWriteLock;
33
34 protected AbstractMotable() {
35 readWriteLock = newReadWriteLock();
36 }
37
38 @Override
39 protected SimpleEvictableMemento newMemento() {
40 return new AbstractMotableMemento();
41 }
42
43 public AbstractMotableMemento getAbstractMotableMemento() {
44 return (AbstractMotableMemento) memento;
45 }
46
47 public ReadWriteLock getReadWriteLock() {
48 return readWriteLock;
49 }
50
51 public synchronized void init(long creationTime, long lastAccessedTime, int maxInactiveInterval, String name) {
52 init(creationTime, lastAccessedTime, maxInactiveInterval);
53 getAbstractMotableMemento().setName(name);
54 }
55
56 public synchronized void rehydrate(long creationTime, long lastAccessedTime, int maxInactiveInterval, String name, byte[] body)
57 throws RehydrationException {
58 initExisting(creationTime, lastAccessedTime, maxInactiveInterval, name, body);
59 }
60
61 public synchronized void restore(long creationTime, long lastAccessedTime, int maxInactiveInterval, String name, byte[] body)
62 throws RehydrationException {
63 initExisting(creationTime, lastAccessedTime, maxInactiveInterval, name, body);
64 }
65
66 public synchronized void copy(Motable motable) throws Exception {
67 super.copy(motable);
68 getAbstractMotableMemento().setName(motable.getName());
69 getAbstractMotableMemento().setNewSession(false);
70 setBodyAsByteArray(motable.getBodyAsByteArray());
71 }
72
73 public synchronized void mote(Motable recipient) throws Exception {
74 recipient.copy(this);
75 destroyForMotion();
76 }
77
78 public synchronized String getName() {
79 return getAbstractMotableMemento().getName();
80 }
81
82 public synchronized boolean isNew() {
83 return getAbstractMotableMemento().isNewSession();
84 }
85
86 public synchronized void destroy() throws Exception {
87 super.destroy();
88 getAbstractMotableMemento().setNewSession(false);
89 }
90
91 @Override
92 protected void onDeserialization() {
93 readWriteLock = newReadWriteLock();
94 }
95
96 protected ReadWriteLock newReadWriteLock() {
97 return new ReentrantReadWriteLock();
98 }
99
100 protected synchronized void initExisting(long creationTime,
101 long lastAccessedTime,
102 int maxInactiveInterval,
103 String name,
104 byte[] body) throws RehydrationException {
105 getAbstractMotableMemento().setNewSession(false);
106 init(creationTime, lastAccessedTime, maxInactiveInterval, name);
107 try {
108 setBodyAsByteArray(body);
109 } catch (Exception e) {
110 throw new RehydrationException(e);
111 }
112 }
113
114 protected void destroyForMotion() throws Exception {
115 super.destroy();
116 }
117
118 }
119
120