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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.orm.jpa 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.orm.jpa;
018:
019:        import javax.persistence.EntityManagerFactory;
020:        import javax.persistence.PersistenceException;
021:        import javax.persistence.spi.PersistenceProvider;
022:        import javax.persistence.spi.PersistenceUnitInfo;
023:        import javax.sql.DataSource;
024:
025:        import org.springframework.beans.BeanUtils;
026:        import org.springframework.context.ResourceLoaderAware;
027:        import org.springframework.context.weaving.LoadTimeWeaverAware;
028:        import org.springframework.core.io.ResourceLoader;
029:        import org.springframework.instrument.classloading.LoadTimeWeaver;
030:        import org.springframework.jdbc.datasource.lookup.SingleDataSourceLookup;
031:        import org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager;
032:        import org.springframework.orm.jpa.persistenceunit.PersistenceUnitManager;
033:        import org.springframework.orm.jpa.persistenceunit.PersistenceUnitPostProcessor;
034:        import org.springframework.util.ClassUtils;
035:
036:        /**
037:         * {@link org.springframework.beans.factory.FactoryBean} that creates a JPA
038:         * {@link javax.persistence.EntityManagerFactory} according to JPA's standard
039:         * <i>container</i> bootstrap contract. This is the most powerful way to set
040:         * up a shared JPA EntityManagerFactory in a Spring application context;
041:         * the EntityManagerFactory can then be passed to JPA-based DAOs via
042:         * dependency injection. Note that switching to a JNDI lookup or to a
043:         * {@link org.springframework.orm.jpa.LocalEntityManagerFactoryBean}
044:         * definition is just a matter of configuration!
045:         *
046:         * <p>As with {@link LocalEntityManagerFactoryBean}, configuration settings
047:         * are usually read in from a <code>META-INF/persistence.xml</code> config file,
048:         * residing in the class path, according to the general JPA configuration contract.
049:         * However, this FactoryBean is more flexible in that you can override the location
050:         * of the <code>persistence.xml</code> file, specify the JDBC DataSources to link to,
051:         * etc. Furthermore, it allows for pluggable class instrumentation through Spring's
052:         * {@link org.springframework.instrument.classloading.LoadTimeWeaver} abstraction,
053:         * instead of being tied to a special VM agent specified on JVM startup.
054:         *
055:         * <p>Internally, this FactoryBean parses the <code>persistence.xml</code> file
056:         * itself and creates a corresponding {@link javax.persistence.spi.PersistenceUnitInfo}
057:         * object (with further configuration merged in, such as JDBC DataSources and the
058:         * Spring LoadTimeWeaver), to be passed to the chosen JPA
059:         * {@link javax.persistence.spi.PersistenceProvider}. This corresponds to a
060:         * local JPA container with full support for the standard JPA container contract.
061:         *
062:         * <p>The exposed EntityManagerFactory object will implement all the interfaces of
063:         * the underlying native EntityManagerFactory returned by the PersistenceProvider,
064:         * plus the {@link EntityManagerFactoryInfo} interface which exposes additional
065:         * metadata as assembled by this FactoryBean.
066:         *
067:         * @author Juergen Hoeller
068:         * @author Rod Johnson
069:         * @since 2.0
070:         * @see #setPersistenceXmlLocation
071:         * @see #setJpaProperties
072:         * @see #setJpaVendorAdapter
073:         * @see #setLoadTimeWeaver
074:         * @see #setDataSource
075:         * @see EntityManagerFactoryInfo
076:         * @see LocalEntityManagerFactoryBean
077:         * @see org.springframework.orm.jpa.support.SharedEntityManagerBean
078:         * @see javax.persistence.spi.PersistenceProvider#createContainerEntityManagerFactory
079:         */
080:        public class LocalContainerEntityManagerFactoryBean extends
081:                AbstractEntityManagerFactoryBean implements 
082:                ResourceLoaderAware, LoadTimeWeaverAware {
083:
084:            private PersistenceUnitManager persistenceUnitManager;
085:
086:            private final DefaultPersistenceUnitManager internalPersistenceUnitManager = new DefaultPersistenceUnitManager();
087:
088:            private ClassLoader beanClassLoader = ClassUtils
089:                    .getDefaultClassLoader();
090:
091:            private PersistenceUnitInfo persistenceUnitInfo;
092:
093:            /**
094:             * Set the PersistenceUnitManager to use for obtaining the JPA persistence unit
095:             * that this FactoryBean is supposed to build an EntityManagerFactory for.
096:             * <p>The default is to rely on the local settings specified on this FactoryBean,
097:             * such as "persistenceXmlLocation", "dataSource" and "loadTimeWeaver".
098:             * <p>For reuse of existing persistence unit configuration or more advanced forms
099:             * of custom persistence unit handling, consider defining a separate
100:             * PersistenceUnitManager bean (typically a DefaultPersistenceUnitManager instance)
101:             * and linking it in here. <code>persistence.xml</code> location, DataSource
102:             * configuration and LoadTimeWeaver will be defined on that separate
103:             * DefaultPersistenceUnitManager bean in such a scenario.
104:             * @see #setPersistenceXmlLocation
105:             * @see #setDataSource
106:             * @see #setLoadTimeWeaver
107:             * @see org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager
108:             */
109:            public void setPersistenceUnitManager(
110:                    PersistenceUnitManager persistenceUnitManager) {
111:                this .persistenceUnitManager = persistenceUnitManager;
112:            }
113:
114:            /**
115:             * Set the location of the <code>persistence.xml</code> file
116:             * we want to use. This is a Spring resource location.
117:             * <p>Default is "classpath:META-INF/persistence.xml".
118:             * <p><b>NOTE: Only applied if no external PersistenceUnitManager specified.</b>
119:             * @param persistenceXmlLocation a Spring resource String
120:             * identifying the location of the <code>persistence.xml</code> file
121:             * that this LocalContainerEntityManagerFactoryBean should parse
122:             * @see #setPersistenceUnitManager
123:             */
124:            public void setPersistenceXmlLocation(String persistenceXmlLocation) {
125:                this .internalPersistenceUnitManager
126:                        .setPersistenceXmlLocations(new String[] { persistenceXmlLocation });
127:            }
128:
129:            /**
130:             * Specify the JDBC DataSource that the JPA persistence provider is supposed
131:             * to use for accessing the database. This is an alternative to keeping the
132:             * JDBC configuration in <code>persistence.xml</code>, passing in a Spring-managed
133:             * DataSource instead.
134:             * <p>In JPA speak, a DataSource passed in here will be used as "nonJtaDataSource"
135:             * on the PersistenceUnitInfo passed to the PersistenceProvider, overriding
136:             * data source configuration in <code>persistence.xml</code> (if any).
137:             * <p><b>NOTE: Only applied if no external PersistenceUnitManager specified.</b>
138:             * @see javax.persistence.spi.PersistenceUnitInfo#getNonJtaDataSource()
139:             * @see #setPersistenceUnitManager
140:             */
141:            public void setDataSource(DataSource dataSource) {
142:                this .internalPersistenceUnitManager
143:                        .setDataSourceLookup(new SingleDataSourceLookup(
144:                                dataSource));
145:                this .internalPersistenceUnitManager
146:                        .setDefaultDataSource(dataSource);
147:            }
148:
149:            /**
150:             * Set the PersistenceUnitPostProcessors to be applied to the
151:             * PersistenceUnitInfo used for creating this EntityManagerFactory.
152:             * <p>Such post-processors can, for example, register further entity
153:             * classes and jar files, in addition to the metadata read in from
154:             * <code>persistence.xml</code>.
155:             * <p><b>NOTE: Only applied if no external PersistenceUnitManager specified.</b>
156:             * @see #setPersistenceUnitManager
157:             */
158:            public void setPersistenceUnitPostProcessors(
159:                    PersistenceUnitPostProcessor[] postProcessors) {
160:                this .internalPersistenceUnitManager
161:                        .setPersistenceUnitPostProcessors(postProcessors);
162:            }
163:
164:            /**
165:             * Specify the Spring LoadTimeWeaver to use for class instrumentation according
166:             * to the JPA class transformer contract.
167:             * <p>It is a not required to specify a LoadTimeWeaver: Most providers will be
168:             * able to provide a subset of their functionality without class instrumentation
169:             * as well, or operate with their VM agent specified on JVM startup.
170:             * <p>In terms of Spring-provided weaving options, the most important ones are
171:             * InstrumentationLoadTimeWeaver, which requires a Spring-specific (but very general)
172:             * VM agent specified on JVM startup, and ReflectiveLoadTimeWeaver, which interacts
173:             * with an underlying ClassLoader based on specific extended methods being available
174:             * on it (for example, interacting with Spring's TomcatInstrumentableClassLoader).
175:             * <p><b>NOTE:</b> As of Spring 2.5, the context's default LoadTimeWeaver (defined
176:             * as bean with name "loadTimeWeaver") will be picked up automatically, if available,
177:             * removing the need for LoadTimeWeaver configuration on each affected target bean.</b>
178:             * Consider using the <code>context:load-time-weaver</code> XML tag for creating
179:             * such a shared LoadTimeWeaver (autodetecting the environment by default).
180:             * <p><b>NOTE: Only applied if no external PersistenceUnitManager specified.</b>
181:             * Otherwise, the external {@link #setPersistenceUnitManager PersistenceUnitManager}
182:             * is responsible for the weaving configuration.
183:             * @see org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver
184:             * @see org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver
185:             * @see org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader
186:             */
187:            public void setLoadTimeWeaver(LoadTimeWeaver loadTimeWeaver) {
188:                this .internalPersistenceUnitManager
189:                        .setLoadTimeWeaver(loadTimeWeaver);
190:            }
191:
192:            public void setResourceLoader(ResourceLoader resourceLoader) {
193:                this .internalPersistenceUnitManager
194:                        .setResourceLoader(resourceLoader);
195:                this .beanClassLoader = resourceLoader.getClassLoader();
196:            }
197:
198:            @Override
199:            protected EntityManagerFactory createNativeEntityManagerFactory()
200:                    throws PersistenceException {
201:                PersistenceUnitManager managerToUse = this .persistenceUnitManager;
202:                if (this .persistenceUnitManager == null) {
203:                    this .internalPersistenceUnitManager.afterPropertiesSet();
204:                    managerToUse = this .internalPersistenceUnitManager;
205:                }
206:
207:                this .persistenceUnitInfo = determinePersistenceUnitInfo(managerToUse);
208:
209:                PersistenceProvider provider = getPersistenceProvider();
210:                if (provider == null) {
211:                    String providerClassName = this .persistenceUnitInfo
212:                            .getPersistenceProviderClassName();
213:                    if (providerClassName == null) {
214:                        throw new IllegalArgumentException(
215:                                "No PersistenceProvider specified in EntityManagerFactory configuration, "
216:                                        + "and chosen PersistenceUnitInfo does not specify a provider class name either");
217:                    }
218:                    Class providerClass = ClassUtils.resolveClassName(
219:                            providerClassName, this .beanClassLoader);
220:                    provider = (PersistenceProvider) BeanUtils
221:                            .instantiateClass(providerClass);
222:                }
223:                if (provider == null) {
224:                    throw new IllegalStateException(
225:                            "Unable to determine persistence provider. "
226:                                    + "Please check configuration of "
227:                                    + getClass().getName()
228:                                    + "; "
229:                                    + "ideally specify the appropriate JpaVendorAdapter class for this provider.");
230:                }
231:
232:                if (logger.isInfoEnabled()) {
233:                    logger
234:                            .info("Building JPA container EntityManagerFactory for persistence unit '"
235:                                    + this .persistenceUnitInfo
236:                                            .getPersistenceUnitName() + "'");
237:                }
238:                this .nativeEntityManagerFactory = provider
239:                        .createContainerEntityManagerFactory(
240:                                this .persistenceUnitInfo, getJpaPropertyMap());
241:                postProcessEntityManagerFactory(
242:                        this .nativeEntityManagerFactory,
243:                        this .persistenceUnitInfo);
244:
245:                return this .nativeEntityManagerFactory;
246:            }
247:
248:            /**
249:             * Determine the PersistenceUnitInfo to use for the EntityManagerFactory
250:             * created by this bean.
251:             * <p>The default implementation reads in all persistence unit infos from
252:             * <code>persistence.xml</code>, as defined in the JPA specification.
253:             * If no entity manager name was specified, it takes the first info in the
254:             * array as returned by the reader. Otherwise, it checks for a matching name.
255:             * @param persistenceUnitManager the PersistenceUnitManager to obtain from
256:             * @return the chosen PersistenceUnitInfo
257:             */
258:            protected PersistenceUnitInfo determinePersistenceUnitInfo(
259:                    PersistenceUnitManager persistenceUnitManager) {
260:                if (getPersistenceUnitName() != null) {
261:                    return persistenceUnitManager
262:                            .obtainPersistenceUnitInfo(getPersistenceUnitName());
263:                } else {
264:                    return persistenceUnitManager
265:                            .obtainDefaultPersistenceUnitInfo();
266:                }
267:            }
268:
269:            /**
270:             * Hook method allowing subclasses to customize the EntityManagerFactory
271:             * after its creation via the PersistenceProvider.
272:             * <p>The default implementation is empty.
273:             * @param emf the newly created EntityManagerFactory we are working with
274:             * @param pui the PersistenceUnitInfo used to configure the EntityManagerFactory
275:             * @see javax.persistence.spi.PersistenceProvider#createContainerEntityManagerFactory
276:             */
277:            protected void postProcessEntityManagerFactory(
278:                    EntityManagerFactory emf, PersistenceUnitInfo pui) {
279:            }
280:
281:            public PersistenceUnitInfo getPersistenceUnitInfo() {
282:                return this .persistenceUnitInfo;
283:            }
284:
285:            public String getPersistenceUnitName() {
286:                if (this .persistenceUnitInfo != null) {
287:                    return this .persistenceUnitInfo.getPersistenceUnitName();
288:                }
289:                return super .getPersistenceUnitName();
290:            }
291:
292:            public DataSource getDataSource() {
293:                if (this.persistenceUnitInfo != null) {
294:                    return this.persistenceUnitInfo.getNonJtaDataSource();
295:                }
296:                return this.internalPersistenceUnitManager
297:                        .getDefaultDataSource();
298:            }
299:
300:        }
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