org.springframework.orm.hibernate3
Class AbstractSessionFactoryBean

java.lang.Object
  org.springframework.orm.hibernate3.AbstractSessionFactoryBean

All Implemented Interfaces:

DisposableBean, FactoryBean, InitializingBean, PersistenceExceptionTranslator

Direct Known Subclasses:

LocalSessionFactoryBean

public abstract class AbstractSessionFactoryBean
extends Object
implements FactoryBean, InitializingBean, DisposableBean, PersistenceExceptionTranslator

Abstract FactoryBean that creates a Hibernate SessionFactory within a Spring application context, providing general infrastructure not related to Hibernate's specific configuration API.

This class implements the PersistenceExceptionTranslator interface, as autodetected by Spring's 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.

This class mainly serves as common base class for LocalSessionFactoryBean. For details on typical SessionFactory setup, see the LocalSessionFactoryBean javadoc.

Since:

2.0

Author:

Juergen Hoeller

See Also:

setExposeTransactionAwareSessionFactory(boolean), SessionFactory.getCurrentSession(), PersistenceExceptionTranslationPostProcessor

Field Summary

protected Log

logger Logger available to subclasses

Constructor Summary

AbstractSessionFactoryBean()

Method Summary

void	afterPropertiesSet() Build and expose the SessionFactory.
protected void	afterSessionFactoryCreation() Hook that allows post-processing after the SessionFactory has been successfully created.
protected void	beforeSessionFactoryDestruction() Hook that allows shutdown processing before the SessionFactory will be closed.
protected abstract SessionFactory	buildSessionFactory() Build the underlying Hibernate SessionFactory.
protected DataAccessException	convertHibernateAccessException(HibernateException ex) Convert the given HibernateException to an appropriate exception from the org.springframework.dao hierarchy.
void	destroy() Close the SessionFactory on bean factory shutdown.
DataSource	getDataSource() Return the DataSource to be used by the SessionFactory.
Object	getObject() Return the singleton SessionFactory.
Class	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
protected SessionFactory	getSessionFactory() Return the exposed SessionFactory.
protected boolean	isExposeTransactionAwareSessionFactory() Return whether to expose a transaction-aware proxy for the SessionFactory.
boolean	isSingleton() Is the object managed by this factory a singleton?
protected boolean	isUseTransactionAwareDataSource() Return whether to use a transaction-aware DataSource for the SessionFactory.
void	setDataSource(DataSource dataSource) Set the DataSource to be used by the SessionFactory.
void	setExposeTransactionAwareSessionFactory(boolean exposeTransactionAwareSessionFactory) Set whether to expose a transaction-aware current Session from the SessionFactory's getCurrentSession() method, returning the Session that's associated with the current Spring-managed transaction, if any.
void	setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator) Set the JDBC exception translator for the SessionFactory, exposed via the PersistenceExceptionTranslator interface.
void	setUseTransactionAwareDataSource(boolean useTransactionAwareDataSource) 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.
DataAccessException	translateExceptionIfPossible(RuntimeException ex) Implementation of the PersistenceExceptionTranslator interface, as autodetected by Spring's PersistenceExceptionTranslationPostProcessor.
protected SessionFactory	wrapSessionFactoryIfNecessary(SessionFactory rawSf) Wrap the given SessionFactory with a proxy, if demanded.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final Log logger

Logger available to subclasses

Constructor Detail

AbstractSessionFactoryBean

public AbstractSessionFactoryBean()

Method Detail

setDataSource

public void setDataSource(DataSource dataSource)

Set the DataSource to be used by the SessionFactory. If set, this will override corresponding settings in Hibernate properties.

If this is set, the Hibernate settings should not define a connection provider to avoid meaningless double configuration.

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.

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 Also:

setUseTransactionAwareDataSource(boolean), HibernateTransactionManager, JtaTransactionManager, LazyConnectionDataSourceProxy

getDataSource

public DataSource getDataSource()

Return the DataSource to be used by the SessionFactory.

setUseTransactionAwareDataSource

public void setUseTransactionAwareDataSource(boolean useTransactionAwareDataSource)

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.

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.

If you switch this flag to "true", Spring's Hibernate access will be able to participate in JDBC-based transactions managed outside of Hibernate (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.

A further benefit of this option is that plain Sessions opened directly via the SessionFactory, outside of Spring's Hibernate support, will still participate in active Spring-managed transactions. However, consider using Hibernate's getCurrentSession() method instead (see javadoc of "exposeTransactionAwareSessionFactory" property).

WARNING: 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".

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 Also:

setDataSource(javax.sql.DataSource), setExposeTransactionAwareSessionFactory(boolean), TransactionAwareDataSourceProxy, DataSourceTransactionManager, OpenSessionInViewFilter, OpenSessionInViewInterceptor, HibernateTransactionManager, JtaTransactionManager

isUseTransactionAwareDataSource

protected boolean isUseTransactionAwareDataSource()

Return whether to use a transaction-aware DataSource for the SessionFactory.

setExposeTransactionAwareSessionFactory

public void setExposeTransactionAwareSessionFactory(boolean exposeTransactionAwareSessionFactory)

Set whether to expose a transaction-aware current Session from the SessionFactory's getCurrentSession() method, returning the Session that's associated with the current Spring-managed transaction, if any.

Default is "true", letting data access code work with the plain Hibernate SessionFactory and its getCurrentSession() 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, getCurrentSession() will also seamlessly work with a request-scoped Session managed by OpenSessionInViewFilter/Interceptor.

Turn this flag off to expose the plain Hibernate SessionFactory with Hibernate's default getCurrentSession() behavior, supporting plain JTA synchronization only. Alternatively, simply override the corresponding Hibernate property "hibernate.current_session_context_class".

See Also:

SpringSessionContext, SessionFactory.getCurrentSession(), JtaTransactionManager, HibernateTransactionManager, OpenSessionInViewFilter, OpenSessionInViewInterceptor

isExposeTransactionAwareSessionFactory

protected boolean isExposeTransactionAwareSessionFactory()

Return whether to expose a transaction-aware proxy for the SessionFactory.

setJdbcExceptionTranslator

public void setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator)

Set the JDBC exception translator for the SessionFactory, exposed via the PersistenceExceptionTranslator interface.

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).

Parameters:

jdbcExceptionTranslator - the exception translator

See Also:

SQLException, JDBCException, SQLErrorCodeSQLExceptionTranslator, SQLStateSQLExceptionTranslator, PersistenceExceptionTranslator

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Build and expose the SessionFactory.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

Exception - in the event of misconfiguration (such as failure to set an essential property) or if initialization fails.

See Also:

buildSessionFactory(), wrapSessionFactoryIfNecessary(org.hibernate.SessionFactory)

wrapSessionFactoryIfNecessary

protected SessionFactory wrapSessionFactoryIfNecessary(SessionFactory rawSf)

Wrap the given SessionFactory with a proxy, if demanded.

The default implementation simply returns the given SessionFactory as-is. Subclasses may override this to implement transaction awareness through a SessionFactory proxy, for example.

Parameters:

rawSf - the raw SessionFactory as built by buildSessionFactory()

Returns:

the SessionFactory reference to expose

See Also:

buildSessionFactory()

getSessionFactory

protected final SessionFactory getSessionFactory()

Return the exposed SessionFactory. Will throw an exception if not initialized yet.

Returns:

the SessionFactory (never null)

Throws:

IllegalStateException - if the SessionFactory has not been initialized yet

destroy

public void destroy()
             throws HibernateException

Close the SessionFactory on bean factory shutdown.

Specified by:

destroy in interface DisposableBean

Throws:

HibernateException

getObject

public Object getObject()

Return the singleton SessionFactory.

Specified by:

getObject in interface FactoryBean

Returns:

an instance of the bean (can be null)

See Also:

FactoryBeanNotInitializedException

getObjectType

public Class getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:

getObjectType in interface FactoryBean

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

Specified by:

isSingleton in interface FactoryBean

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()

translateExceptionIfPossible

public DataAccessException translateExceptionIfPossible(RuntimeException ex)

Implementation of the PersistenceExceptionTranslator interface, as autodetected by Spring's PersistenceExceptionTranslationPostProcessor.

Converts the exception if it is a HibernateException; else returns null to indicate an unknown exception.

Specified by:

translateExceptionIfPossible in interface PersistenceExceptionTranslator

Parameters:

ex - a RuntimeException thrown

Returns:

the corresponding DataAccessException (or null if the exception could not be translated, as in this case it may result from user code rather than an actual persistence problem)

See Also:

PersistenceExceptionTranslationPostProcessor, convertHibernateAccessException(org.hibernate.HibernateException)

convertHibernateAccessException

protected DataAccessException convertHibernateAccessException(HibernateException ex)

Convert the given HibernateException to an appropriate exception from the org.springframework.dao hierarchy.

Will automatically apply a specified SQLExceptionTranslator to a Hibernate JDBCException, else rely on Hibernate's default translation.

Parameters:

ex - HibernateException that occured

Returns:

a corresponding DataAccessException

See Also:

SessionFactoryUtils.convertHibernateAccessException(org.hibernate.HibernateException), setJdbcExceptionTranslator(org.springframework.jdbc.support.SQLExceptionTranslator)

buildSessionFactory

protected abstract SessionFactory buildSessionFactory()
                                               throws Exception

Build the underlying Hibernate SessionFactory.

Returns:

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

afterSessionFactoryCreation

protected void afterSessionFactoryCreation()
                                    throws Exception

Hook that allows post-processing after the SessionFactory has been successfully created. The SessionFactory is already available through getSessionFactory() at this point.

This implementation is empty.

Throws:

Exception - in case of initialization failure

See Also:

getSessionFactory()

beforeSessionFactoryDestruction

protected void beforeSessionFactoryDestruction()

Hook that allows shutdown processing before the SessionFactory will be closed. The SessionFactory is still available through getSessionFactory() at this point.

This implementation is empty.

See Also:

getSessionFactory()