org.springframework.orm.hibernate.support
Class OpenSessionInViewInterceptor

org.springframework.orm.hibernate.HibernateAccessor
  |
  +--org.springframework.orm.hibernate.support.OpenSessionInViewInterceptor

public class OpenSessionInViewInterceptor

extends HibernateAccessor

implements HandlerInterceptor

Spring web HandlerInterceptor that binds a Hibernate Session to the thread for the whole processing of the request. Intended for the "Open Session in View" pattern, i.e. to allow for lazy loading in web views despite the original transactions already being completed.

This interceptor works similar to the AOP HibernateInterceptor: It just makes Hibernate Sessions available via the thread. It is suitable for non-transactional execution but also for middle tier transactions via HibernateTransactionManager. The latter will automatically use Sessions pre-bound by this filter.

In contrast to OpenSessionInViewFilter, this interceptor is set up in a Spring application context and can thus take advantage of bean wiring. It derives from HibernateAccessor to inherit common Hibernate configuration properties.

WARNING: Applying this interceptor to existing logic can cause issues that have not appeared before, through the use of a single Hibernate Session for the processing of an entire request. In particular, the reassociation of persistent objects with a Hibernate Session has to occur at the very beginning of request processing, to avoid clashes will already loaded instances of the same objects.

NOTE: This interceptor will by default not flush the Hibernate session, as it assumes to be used in combination with middle tier transactions that care for the flushing, or HibernateAccessors with flushMode FLUSH_EAGER. If you want this interceptor to flush after the handler has been invoked but before view rendering, set the flushMode of this interceptor to FLUSH_AUTO in such a scenario.

Author:

Juergen Hoeller

Since: 06.12.2003

See Also: org.springframework.orm.hibernate.HibernateAccessor.setFlushMode(int), OpenSessionInViewFilter, HibernateInterceptor, HibernateTransactionManager

Constructor Summary

OpenSessionInViewInterceptor()           Create a new OpenSessionInViewInterceptor, turning the default flushMode to FLUSH_NEVER.

Method Summary
void	afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)           Unbinds the Hibernate Session from the thread and closes it.
void	postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)           Flushes the Hibernate Session before view rendering, if necessary.
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)           Opens a new Hibernate Session according to the settings of this HibernateAccessor and binds in to the thread via TransactionSynchronizationManager.

Methods inherited from class org.springframework.orm.hibernate.HibernateAccessor

afterPropertiesSet, convertHibernateAccessException, flushIfNecessary, getEntityInterceptor, getFlushMode, getJdbcExceptionTranslator, getSessionFactory, setEntityInterceptor, setFlushMode, setFlushModeName, setJdbcExceptionTranslator, setSessionFactory

Constructor Detail

OpenSessionInViewInterceptor

public OpenSessionInViewInterceptor()

Create a new OpenSessionInViewInterceptor, turning the default flushMode to FLUSH_NEVER.

See Also:

org.springframework.orm.hibernate.HibernateAccessor.setFlushMode(int)

public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                      throws org.springframework.dao.DataAccessException

Unbinds the Hibernate Session from the thread and closes it.

See Also:

org.springframework.orm.hibernate.SessionFactoryUtils.closeSessionIfNecessary(Session,SessionFactory), TransactionSynchronizationManager

public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
                 throws org.springframework.dao.DataAccessException

Flushes the Hibernate Session before view rendering, if necessary. Set the flushMode of this HibernateAccessor to FLUSH_NEVER to avoid this extra flushing.

See Also:

org.springframework.orm.hibernate.HibernateAccessor.setFlushMode(int)

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                   throws org.springframework.dao.DataAccessException

Opens a new Hibernate Session according to the settings of this HibernateAccessor and binds in to the thread via TransactionSynchronizationManager.

See Also:

org.springframework.orm.hibernate.SessionFactoryUtils.getSession(SessionFactory,boolean), TransactionSynchronizationManager