1 /*
2 * Hibernate, Relational Persistence for Idiomatic Java
3 *
4 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
5 * indicated by the @author tags or express copyright attribution
6 * statements applied by the authors. All third-party contributions are
7 * distributed under license by Red Hat Middleware LLC.
8 *
9 * This copyrighted material is made available to anyone wishing to use, modify,
10 * copy, or redistribute it subject to the terms and conditions of the GNU
11 * Lesser General Public License, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
16 * for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this distribution; if not, write to:
20 * Free Software Foundation, Inc.
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02110-1301 USA
23 *
24 */
25 package org.hibernate.event.def;
26
27 import java.io.Serializable;
28
29 import org.slf4j.Logger;
30 import org.slf4j.LoggerFactory;
31 import org.hibernate.HibernateException;
32 import org.hibernate.cache.CacheKey;
33 import org.hibernate.cache.entry.CollectionCacheEntry;
34 import org.hibernate.collection.PersistentCollection;
35 import org.hibernate.engine.CollectionEntry;
36 import org.hibernate.engine.PersistenceContext;
37 import org.hibernate.engine.SessionFactoryImplementor;
38 import org.hibernate.event.InitializeCollectionEvent;
39 import org.hibernate.event.InitializeCollectionEventListener;
40 import org.hibernate.engine.SessionImplementor;
41 import org.hibernate.persister.collection.CollectionPersister;
42 import org.hibernate.pretty.MessageHelper;
43
44 /**
45 * @author Gavin King
46 */
47 public class DefaultInitializeCollectionEventListener implements InitializeCollectionEventListener {
48
49 private static final Logger log = LoggerFactory.getLogger(DefaultInitializeCollectionEventListener.class);
50
51 /**
52 * called by a collection that wants to initialize itself
53 */
54 public void onInitializeCollection(InitializeCollectionEvent event)
55 throws HibernateException {
56
57 PersistentCollection collection = event.getCollection();
58 SessionImplementor source = event.getSession();
59
60 CollectionEntry ce = source.getPersistenceContext().getCollectionEntry(collection);
61 if (ce==null) throw new HibernateException("collection was evicted");
62 if ( !collection.wasInitialized() ) {
63 if ( log.isTraceEnabled() ) {
64 log.trace(
65 "initializing collection " +
66 MessageHelper.collectionInfoString( ce.getLoadedPersister(), ce.getLoadedKey(), source.getFactory() )
67 );
68 }
69
70 log.trace("checking second-level cache");
71 final boolean foundInCache = initializeCollectionFromCache(
72 ce.getLoadedKey(),
73 ce.getLoadedPersister(),
74 collection,
75 source
76 );
77
78 if (foundInCache) {
79 log.trace("collection initialized from cache");
80 }
81 else {
82 log.trace("collection not cached");
83 ce.getLoadedPersister().initialize( ce.getLoadedKey(), source );
84 log.trace("collection initialized");
85
86 if ( source.getFactory().getStatistics().isStatisticsEnabled() ) {
87 source.getFactory().getStatisticsImplementor().fetchCollection(
88 ce.getLoadedPersister().getRole()
89 );
90 }
91 }
92 }
93 }
94
95 /**
96 * Try to initialize a collection from the cache
97 *
98 * @param id The id of the collection of initialize
99 * @param persister The collection persister
100 * @param collection The collection to initialize
101 * @param source The originating session
102 * @return true if we were able to initialize the collection from the cache;
103 * false otherwise.
104 */
105 private boolean initializeCollectionFromCache(
106 Serializable id,
107 CollectionPersister persister,
108 PersistentCollection collection,
109 SessionImplementor source) {
110
111 if ( !source.getEnabledFilters().isEmpty() && persister.isAffectedByEnabledFilters( source ) ) {
112 log.trace( "disregarding cached version (if any) of collection due to enabled filters ");
113 return false;
114 }
115
116 final boolean useCache = persister.hasCache() &&
117 source.getCacheMode().isGetEnabled();
118
119 if ( !useCache ) {
120 return false;
121 }
122 else {
123
124 final SessionFactoryImplementor factory = source.getFactory();
125
126 final CacheKey ck = new CacheKey(
127 id,
128 persister.getKeyType(),
129 persister.getRole(),
130 source.getEntityMode(),
131 source.getFactory()
132 );
133 Object ce = persister.getCacheAccessStrategy().get( ck, source.getTimestamp() );
134
135 if ( factory.getStatistics().isStatisticsEnabled() ) {
136 if ( ce == null ) {
137 factory.getStatisticsImplementor().secondLevelCacheMiss(
138 persister.getCacheAccessStrategy().getRegion().getName()
139 );
140 }
141 else {
142 factory.getStatisticsImplementor().secondLevelCacheHit(
143 persister.getCacheAccessStrategy().getRegion().getName()
144 );
145 }
146
147
148 }
149
150 if (ce==null) {
151 return false;
152 }
153 else {
154
155 CollectionCacheEntry cacheEntry = (CollectionCacheEntry) persister.getCacheEntryStructure()
156 .destructure(ce, factory);
157
158 final PersistenceContext persistenceContext = source.getPersistenceContext();
159 cacheEntry.assemble(
160 collection,
161 persister,
162 persistenceContext.getCollectionOwner(id, persister)
163 );
164 persistenceContext.getCollectionEntry(collection).postInitialize(collection);
165 //addInitializedCollection(collection, persister, id);
166 return true;
167 }
168
169 }
170 }
171
172
173 }
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