/*
* Copyright 2002-2010 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.orm.hibernate3;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.JDBCException;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.jdbc.support.SQLExceptionTranslator;
/**
* Abstract {@link org.springframework.beans.factory.FactoryBean} that creates
* a Hibernate {@link org.hibernate.SessionFactory} within a Spring application
* context, providing general infrastructure not related to Hibernate's
* specific configuration API.
*
* <p>This class implements the
* {@link org.springframework.dao.support.PersistenceExceptionTranslator}
* interface, as autodetected by Spring's
* {@link org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor},
* for AOP-based translation of native exceptions to Spring DataAccessExceptions.
* Hence, the presence of e.g. LocalSessionFactoryBean automatically enables
* a PersistenceExceptionTranslationPostProcessor to translate Hibernate exceptions.
*
* <p>This class mainly serves as common base class for {@link LocalSessionFactoryBean}.
* For details on typical SessionFactory setup, see the LocalSessionFactoryBean javadoc.
*
* @author Juergen Hoeller
* @since 2.0
* @see #setExposeTransactionAwareSessionFactory
* @see org.hibernate.SessionFactory#getCurrentSession()
* @see org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor
*/
public abstract class AbstractSessionFactoryBean
implements FactoryBean<SessionFactory>, InitializingBean, DisposableBean, PersistenceExceptionTranslator {
/** Logger available to subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private DataSource dataSource;
private boolean useTransactionAwareDataSource = false;
private boolean exposeTransactionAwareSessionFactory = true;
private SQLExceptionTranslator jdbcExceptionTranslator;
private SessionFactory sessionFactory;
/**
* Set the DataSource to be used by the SessionFactory.
* If set, this will override corresponding settings in Hibernate properties.
* <p>If this is set, the Hibernate settings should not define
* a connection provider to avoid meaningless double configuration.
* <p>If using HibernateTransactionManager as transaction strategy, consider
* proxying your target DataSource with a LazyConnectionDataSourceProxy.
* This defers fetching of an actual JDBC Connection until the first JDBC
* Statement gets executed, even within JDBC transactions (as performed by
* HibernateTransactionManager). Such lazy fetching is particularly beneficial
* for read-only operations, in particular if the chances of resolving the
* result in the second-level cache are high.
* <p>As JTA and transactional JNDI DataSources already provide lazy enlistment
* of JDBC Connections, LazyConnectionDataSourceProxy does not add value with
* JTA (i.e. Spring's JtaTransactionManager) as transaction strategy.
* @see #setUseTransactionAwareDataSource
* @see HibernateTransactionManager
* @see org.springframework.transaction.jta.JtaTransactionManager
* @see org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy
*/
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
/**
* Return the DataSource to be used by the SessionFactory.
*/
public DataSource getDataSource() {
return this.dataSource;
}
/**
* Set whether to use a transaction-aware DataSource for the SessionFactory,
* i.e. whether to automatically wrap the passed-in DataSource with Spring's
* TransactionAwareDataSourceProxy.
* <p>Default is "false": LocalSessionFactoryBean is usually used with Spring's
* HibernateTransactionManager or JtaTransactionManager, both of which work nicely
* on a plain JDBC DataSource. Hibernate Sessions and their JDBC Connections are
* fully managed by the Hibernate/JTA transaction infrastructure in such a scenario.
* <p>If you switch this flag to "true", Spring's Hibernate access will be able to
* <i>participate in JDBC-based transactions managed outside of Hibernate</i>
* (for example, by Spring's DataSourceTransactionManager). This can be convenient
* if you need a different local transaction strategy for another O/R mapping tool,
* for example, but still want Hibernate access to join into those transactions.
* <p>A further benefit of this option is that <i>plain Sessions opened directly
* via the SessionFactory</i>, outside of Spring's Hibernate support, will still
* participate in active Spring-managed transactions. However, consider using
* Hibernate's <code>getCurrentSession()</code> method instead (see javadoc of
* "exposeTransactionAwareSessionFactory" property).
* <p><b>WARNING:</b> When using a transaction-aware JDBC DataSource in combination
* with OpenSessionInViewFilter/Interceptor, whether participating in JTA or
* external JDBC-based transactions, it is strongly recommended to set Hibernate's
* Connection release mode to "after_transaction" or "after_statement", which
* guarantees proper Connection handling in such a scenario. In contrast to that,
* HibernateTransactionManager generally requires release mode "on_close".
* <p>Note: If you want to use Hibernate's Connection release mode "after_statement"
* with a DataSource specified on this LocalSessionFactoryBean (for example, a
* JTA-aware DataSource fetched from JNDI), switch this setting to "true".
* Otherwise, the ConnectionProvider used underneath will vote against aggressive
* release and thus silently switch to release mode "after_transaction".
* @see #setDataSource
* @see #setExposeTransactionAwareSessionFactory
* @see org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy
* @see org.springframework.jdbc.datasource.DataSourceTransactionManager
* @see org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
* @see org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor
* @see HibernateTransactionManager
* @see org.springframework.transaction.jta.JtaTransactionManager
*/
public void setUseTransactionAwareDataSource(boolean useTransactionAwareDataSource) {
this.useTransactionAwareDataSource = useTransactionAwareDataSource;
}
/**
* Return whether to use a transaction-aware DataSource for the SessionFactory.
*/
protected boolean isUseTransactionAwareDataSource() {
return this.useTransactionAwareDataSource;
}
/**
* Set whether to expose a transaction-aware current Session from the
* SessionFactory's <code>getCurrentSession()</code> method, returning the
* Session that's associated with the current Spring-managed transaction, if any.
* <p>Default is "true", letting data access code work with the plain
* Hibernate SessionFactory and its <code>getCurrentSession()</code> method,
* while still being able to participate in current Spring-managed transactions:
* with any transaction management strategy, either local or JTA / EJB CMT,
* and any transaction synchronization mechanism, either Spring or JTA.
* Furthermore, <code>getCurrentSession()</code> will also seamlessly work with
* a request-scoped Session managed by OpenSessionInViewFilter/Interceptor.
* <p>Turn this flag off to expose the plain Hibernate SessionFactory with
* Hibernate's default <code>getCurrentSession()</code> behavior, supporting
* plain JTA synchronization only. Alternatively, simply override the
* corresponding Hibernate property "hibernate.current_session_context_class".
* @see SpringSessionContext
* @see org.hibernate.SessionFactory#getCurrentSession()
* @see org.springframework.transaction.jta.JtaTransactionManager
* @see HibernateTransactionManager
* @see org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
* @see org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor
*/
public void setExposeTransactionAwareSessionFactory(boolean exposeTransactionAwareSessionFactory) {
this.exposeTransactionAwareSessionFactory = exposeTransactionAwareSessionFactory;
}
/**
* Return whether to expose a transaction-aware proxy for the SessionFactory.
*/
protected boolean isExposeTransactionAwareSessionFactory() {
return this.exposeTransactionAwareSessionFactory;
}
/**
* Set the JDBC exception translator for the SessionFactory,
* exposed via the PersistenceExceptionTranslator interface.
* <p>Applied to any SQLException root cause of a Hibernate JDBCException,
* overriding Hibernate's default SQLException translation (which is
* based on Hibernate's Dialect for a specific target database).
* @param jdbcExceptionTranslator the exception translator
* @see java.sql.SQLException
* @see org.hibernate.JDBCException
* @see org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator
* @see org.springframework.jdbc.support.SQLStateSQLExceptionTranslator
* @see org.springframework.dao.support.PersistenceExceptionTranslator
*/
public void setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator) {
this.jdbcExceptionTranslator = jdbcExceptionTranslator;
}
/**
* Build and expose the SessionFactory.
* @see #buildSessionFactory()
* @see #wrapSessionFactoryIfNecessary
*/
public void afterPropertiesSet() throws Exception {
SessionFactory rawSf = buildSessionFactory();
this.sessionFactory = wrapSessionFactoryIfNecessary(rawSf);
afterSessionFactoryCreation();
}
/**
* Wrap the given SessionFactory with a proxy, if demanded.
* <p>The default implementation simply returns the given SessionFactory as-is.
* Subclasses may override this to implement transaction awareness through
* a SessionFactory proxy, for example.
* @param rawSf the raw SessionFactory as built by {@link #buildSessionFactory()}
* @return the SessionFactory reference to expose
* @see #buildSessionFactory()
*/
protected SessionFactory wrapSessionFactoryIfNecessary(SessionFactory rawSf) {
return rawSf;
}
/**
* Return the exposed SessionFactory.
* Will throw an exception if not initialized yet.
* @return the SessionFactory (never <code>null</code>)
* @throws IllegalStateException if the SessionFactory has not been initialized yet
*/
protected final SessionFactory getSessionFactory() {
if (this.sessionFactory == null) {
throw new IllegalStateException("SessionFactory not initialized yet");
}
return this.sessionFactory;
}
/**
* Close the SessionFactory on bean factory shutdown.
*/
public void destroy() throws HibernateException {
logger.info("Closing Hibernate SessionFactory");
try {
beforeSessionFactoryDestruction();
}
finally {
this.sessionFactory.close();
}
}
/**
* Return the singleton SessionFactory.
*/
public SessionFactory getObject() {
return this.sessionFactory;
}
public Class<? extends SessionFactory> getObjectType() {
return (this.sessionFactory != null ? this.sessionFactory.getClass() : SessionFactory.class);
}
public boolean isSingleton() {
return true;
}
/**
* Implementation of the PersistenceExceptionTranslator interface,
* as autodetected by Spring's PersistenceExceptionTranslationPostProcessor.
* <p>Converts the exception if it is a HibernateException;
* else returns <code>null</code> to indicate an unknown exception.
* @see org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor
* @see #convertHibernateAccessException
*/
public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
if (ex instanceof HibernateException) {
return convertHibernateAccessException((HibernateException) ex);
}
return null;
}
/**
* Convert the given HibernateException to an appropriate exception from the
* <code>org.springframework.dao</code> hierarchy.
* <p>Will automatically apply a specified SQLExceptionTranslator to a
* Hibernate JDBCException, else rely on Hibernate's default translation.
* @param ex HibernateException that occured
* @return a corresponding DataAccessException
* @see SessionFactoryUtils#convertHibernateAccessException
* @see #setJdbcExceptionTranslator
*/
protected DataAccessException convertHibernateAccessException(HibernateException ex) {
if (this.jdbcExceptionTranslator != null && ex instanceof JDBCException) {
JDBCException jdbcEx = (JDBCException) ex;
return this.jdbcExceptionTranslator.translate(
"Hibernate operation: " + jdbcEx.getMessage(), jdbcEx.getSQL(), jdbcEx.getSQLException());
}
return SessionFactoryUtils.convertHibernateAccessException(ex);
}
/**
* Build the underlying Hibernate SessionFactory.
* @return the raw SessionFactory (potentially to be wrapped with a
* transaction-aware proxy before it is exposed to the application)
* @throws Exception in case of initialization failure
*/
protected abstract SessionFactory buildSessionFactory() throws Exception;
/**
* Hook that allows post-processing after the SessionFactory has been
* successfully created. The SessionFactory is already available through
* <code>getSessionFactory()</code> at this point.
* <p>This implementation is empty.
* @throws Exception in case of initialization failure
* @see #getSessionFactory()
*/
protected void afterSessionFactoryCreation() throws Exception {
}
/**
* Hook that allows shutdown processing before the SessionFactory
* will be closed. The SessionFactory is still available through
* <code>getSessionFactory()</code> at this point.
* <p>This implementation is empty.
* @see #getSessionFactory()
*/
protected void beforeSessionFactoryDestruction() {
}
}