1 /***
2 * Copyright 2003-2010 Terracotta, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package net.sf.ehcache.hibernate.strategy;
17
18 import net.sf.ehcache.hibernate.regions.EhcacheEntityRegion;
19
20 import org.hibernate.cache.CacheException;
21 import org.hibernate.cache.EntityRegion;
22 import org.hibernate.cache.access.EntityRegionAccessStrategy;
23 import org.hibernate.cache.access.SoftLock;
24 import org.hibernate.cfg.Settings;
25
26 /***
27 * Ehcache specific non-strict read/write entity region access strategy
28 *
29 * @author Chris Dennis
30 */
31 public class NonStrictReadWriteEhcacheEntityRegionAccessStrategy extends AbstractEhcacheAccessStrategy<EhcacheEntityRegion>
32 implements EntityRegionAccessStrategy {
33
34 /***
35 * Create a non-strict read/write access strategy accessing the given collection region.
36 */
37 public NonStrictReadWriteEhcacheEntityRegionAccessStrategy(EhcacheEntityRegion region, Settings settings) {
38 super(region, settings);
39 }
40
41 /***
42 * {@inheritDoc}
43 */
44 public EntityRegion getRegion() {
45 return region;
46 }
47
48 /***
49 * {@inheritDoc}
50 */
51 public Object get(Object key, long txTimestamp) throws CacheException {
52 return region.get(key);
53 }
54
55 /***
56 * {@inheritDoc}
57 */
58 public boolean putFromLoad(Object key, Object value, long txTimestamp, Object version, boolean minimalPutOverride)
59 throws CacheException {
60 if (minimalPutOverride && region.contains(key)) {
61 return false;
62 } else {
63 region.put(key, value);
64 return true;
65 }
66 }
67
68 /***
69 * Since this is a non-strict read/write strategy item locking is not used.
70 */
71 public SoftLock lockItem(Object key, Object version) throws CacheException {
72 return null;
73 }
74
75 /***
76 * Since this is a non-strict read/write strategy item locking is not used.
77 */
78 public void unlockItem(Object key, SoftLock lock) throws CacheException {
79 region.remove(key);
80 }
81
82 /***
83 * Returns <code>false</code> since this is an asynchronous cache access strategy.
84 */
85 public boolean insert(Object key, Object value, Object version) throws CacheException {
86 return false;
87 }
88
89 /***
90 * Returns <code>false</code> since this is a non-strict read/write cache access strategy
91 */
92 public boolean afterInsert(Object key, Object value, Object version) throws CacheException {
93 return false;
94 }
95
96 /***
97 * Removes the entry since this is a non-strict read/write cache strategy.
98 */
99 public boolean update(Object key, Object value, Object currentVersion, Object previousVersion) throws CacheException {
100 remove(key);
101 return false;
102 }
103
104 /***
105 * {@inheritDoc}
106 */
107 public boolean afterUpdate(Object key, Object value, Object currentVersion, Object previousVersion, SoftLock lock)
108 throws CacheException {
109 unlockItem(key, lock);
110 return false;
111 }
112
113 /***
114 * {@inheritDoc}
115 */
116 @Override
117 public void remove(Object key) throws CacheException {
118 region.remove(key);
119 }
120 }