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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.Persistence;
021:        import javax.persistence.PersistenceException;
022:        import javax.persistence.spi.PersistenceProvider;
023:
024:        /**
025:         * {@link org.springframework.beans.factory.FactoryBean} that creates a JPA
026:         * {@link javax.persistence.EntityManagerFactory} according to JPA's standard
027:         * <i>standalone</i> bootstrap contract. This is the simplest way to set up a
028:         * shared JPA EntityManagerFactory in a Spring application context; the
029:         * EntityManagerFactory can then be passed to JPA-based DAOs via
030:         * dependency injection. Note that switching to a JNDI lookup or to a
031:         * {@link org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean}
032:         * definition is just a matter of configuration!
033:         *
034:         * <p>Configuration settings are usually read from a <code>META-INF/persistence.xml</code>
035:         * config file, residing in the class path, according to the JPA standalone bootstrap
036:         * contract. Additionally, most JPA providers will require a special VM agent
037:         * (specified on JVM startup) that allows them to instrument application classes.
038:         * See the Java Persistence API specification and your provider documentation
039:         * for setup details.
040:         *
041:         * <p>This EntityManagerFactory bootstrap is appropriate for standalone applications
042:         * which solely use JPA for data access. If you want to set up your persistence
043:         * provider for an external DataSource and/or for global transactions which span
044:         * multiple resources, you will need to either deploy it into a full Java EE 5
045:         * application server and access the deployed EntityManagerFactory via JNDI,
046:         * or use Spring's {@link LocalContainerEntityManagerFactoryBean} with appropriate
047:         * configuration for local setup according to JPA's container contract.
048:         *
049:         * <p><b>Note:</b> This FactoryBean has limited configuration power in terms of
050:         * what configuration it is able to pass to the JPA provider. If you need more
051:         * flexible configuration, for example passing a Spring-managed JDBC DataSource
052:         * to the JPA provider, consider using Spring's more powerful
053:         * {@link LocalContainerEntityManagerFactoryBean} instead.
054:         *
055:         * @author Juergen Hoeller
056:         * @author Rod Johnson
057:         * @since 2.0
058:         * @see #setJpaProperties
059:         * @see #setJpaVendorAdapter
060:         * @see JpaTemplate#setEntityManagerFactory
061:         * @see JpaTransactionManager#setEntityManagerFactory
062:         * @see LocalContainerEntityManagerFactoryBean
063:         * @see org.springframework.jndi.JndiObjectFactoryBean
064:         * @see org.springframework.orm.jpa.support.SharedEntityManagerBean
065:         * @see javax.persistence.Persistence#createEntityManagerFactory
066:         * @see javax.persistence.spi.PersistenceProvider#createEntityManagerFactory
067:         */
068:        public class LocalEntityManagerFactoryBean extends
069:                AbstractEntityManagerFactoryBean {
070:
071:            /**
072:             * Initialize the EntityManagerFactory for the given configuration.
073:             * @throws javax.persistence.PersistenceException in case of JPA initialization errors
074:             */
075:            protected EntityManagerFactory createNativeEntityManagerFactory()
076:                    throws PersistenceException {
077:                if (logger.isInfoEnabled()) {
078:                    logger
079:                            .info("Building JPA EntityManagerFactory for persistence unit '"
080:                                    + getPersistenceUnitName() + "'");
081:                }
082:                PersistenceProvider provider = getPersistenceProvider();
083:                if (provider != null) {
084:                    // Create EntityManagerFactory directly through PersistenceProvider.
085:                    EntityManagerFactory emf = provider
086:                            .createEntityManagerFactory(
087:                                    getPersistenceUnitName(),
088:                                    getJpaPropertyMap());
089:                    if (emf == null) {
090:                        throw new IllegalStateException(
091:                                "PersistenceProvider ["
092:                                        + provider
093:                                        + "] did not return an EntityManagerFactory for name '"
094:                                        + getPersistenceUnitName() + "'");
095:                    }
096:                    return emf;
097:                } else {
098:                    // Let JPA perform its standard PersistenceProvider autodetection.
099:                    return Persistence.createEntityManagerFactory(
100:                            getPersistenceUnitName(), getJpaPropertyMap());
101:                }
102:            }
103:
104:        }
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