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.ccs;
17
18 import java.util.Comparator;
19
20 import org.hibernate.cache.CacheException;
21 import org.hibernate.cache.access.SoftLock;
22
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
25
26 /***
27 * Ehcache specific non-strict read/write cache concurrency strategy.
28 * <p>
29 * This is the Ehcache specific equivalent to Hibernate's NonstrictReadWriteCache.
30 *
31 * @author Chris Dennis
32 */
33 @Deprecated
34 public class EhcacheNonstrictReadWriteCache extends AbstractEhcacheConcurrencyStrategy {
35
36 private static final Logger LOG = LoggerFactory.getLogger(EhcacheNonstrictReadWriteCache.class);
37
38 /***
39 * {@inheritDoc}
40 */
41 public Object get(Object key, long txTimestamp) throws CacheException {
42 return cache.get(key);
43 }
44
45 /***
46 * {@inheritDoc}
47 */
48 public boolean put(Object key, Object value, long txTimestamp, Object version, Comparator versionComparator, boolean minimalPut)
49 throws CacheException {
50 if (minimalPut && cache.get(key) != null) {
51 return false;
52 } else {
53 cache.put(key, value);
54 return true;
55 }
56 }
57
58 /***
59 * Caching is non-strict so soft locks are not implemented.
60 */
61 public SoftLock lock(Object key, Object version) throws CacheException {
62 return null;
63 }
64
65 /***
66 * Removes the stale item.
67 */
68 public void evict(Object key) throws CacheException {
69 cache.remove(key);
70 }
71
72 /***
73 * Removes the invalidated item.
74 */
75 public boolean update(Object key, Object value, Object currentVersion, Object previousVersion) throws CacheException {
76 evict(key);
77 return false;
78 }
79
80 /***
81 * A No-Op, since we are an asynchronous cache concurrency strategy.
82 */
83 public boolean insert(Object key, Object value, Object currentVersion) throws CacheException {
84 return false;
85 }
86
87 /***
88 * Removes the invalidated item.
89 */
90 public void release(Object key, SoftLock lock) throws CacheException {
91 cache.remove(key);
92 }
93
94 /***
95 * Removes the invalidated item.
96 */
97 public boolean afterUpdate(Object key, Object value, Object version, SoftLock lock) throws CacheException {
98 release(key, lock);
99 return false;
100 }
101
102 /***
103 * A No-Op.
104 */
105 public boolean afterInsert(Object key, Object value, Object version) throws CacheException {
106 return false;
107 }
108
109 /***
110 * {@inheritDoc}
111 */
112 @Override
113 public String toString() {
114 return cache + "(non-strict-read-write)";
115 }
116 }