1 package org.apache.ojb.broker.cache;
2
3 /* Copyright 2003-2005 The Apache Software Foundation
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 import java.util.Collections;
19 import java.util.HashMap;
20 import java.util.Iterator;
21 import java.util.Map;
22 import java.util.Properties;
23
24 import org.apache.ojb.broker.Identity;
25 import org.apache.ojb.broker.PersistenceBroker;
26
27 /**
28 * Global {@link ObjectCache} implementation.
29 *
30 * @author matthew.baird
31 * @version $Id: ObjectCachePerClassImpl.java,v 1.1 2007-08-24 22:17:29 ewestfal Exp $
32 */
33 public class ObjectCachePerClassImpl extends AbstractMetaCache
34 {
35 private static Map cachesByClass = Collections.synchronizedMap(new HashMap());
36
37 /**
38 * Constructor for the ObjectCachePerClassImpl object
39 */
40 public ObjectCachePerClassImpl(PersistenceBroker broker, Properties prop)
41 {
42 setClassCache(Object.class, new ObjectCacheDefaultImpl(broker, null));
43 }
44
45 public ObjectCache getCache(Identity oid, Object obj, int methodCall)
46 {
47 if(oid.getObjectsRealClass() == null)
48 {
49 return null;
50 }
51 else
52 {
53 return getCachePerClass(oid.getObjectsRealClass(), methodCall);
54 }
55 }
56
57 /**
58 * Clears the cache
59 */
60 public void clear()
61 {
62 Iterator it = cachesByClass.values().iterator();
63 while (it.hasNext())
64 {
65 ObjectCache cache = (ObjectCache) it.next();
66 if (cache != null)
67 {
68 cache.clear();
69 }
70 }
71 }
72
73 /**
74 * Sets the ObjectCache implementation to use for objects with the given
75 * type and subclasses
76 *
77 * @param objectClass The object's class, use java.lang.Object to alter
78 * default caching for all objects which have no special
79 * caching defined
80 * @param cache The new ObjectCache implementation to use for this
81 * class and subclasses, null to switch off caching
82 * for the given class
83 */
84 public void setClassCache(Class objectClass, ObjectCache cache)
85
86 {
87 setClassCache(objectClass.getName(), cache);
88 }
89
90 /**
91 * Sets the ObjectCache implementation for the given class name
92 *
93 * @param className The name of the class to cache
94 * @param cache The ObjectCache to use for this class and subclasses
95 */
96 private void setClassCache(String className, ObjectCache cache)
97 {
98 cachesByClass.put(className, cache);
99 }
100
101 /**
102 * Gets the cache for the given class
103 *
104 * @param objectClass The class to look up the cache for
105 * @return The cache
106 */
107 private ObjectCache getCachePerClass(Class objectClass, int methodCall)
108 {
109 ObjectCache cache = (ObjectCache) cachesByClass.get(objectClass.getName());
110 if (cache == null && AbstractMetaCache.METHOD_CACHE == methodCall
111 && !cachesByClass.containsKey(objectClass.getName()))
112 {
113 cache = new ObjectCacheDefaultImpl(null, null);
114 setClassCache(objectClass.getName(), cache);
115 }
116 return cache;
117 }
118 }