org.springframework.orm.hibernate4.support
Class OpenSessionInViewInterceptor

java.lang.Object
  org.springframework.orm.hibernate4.support.OpenSessionInViewInterceptor

All Implemented Interfaces:

WebRequestInterceptor

public class OpenSessionInViewInterceptor
extends Object
implements WebRequestInterceptor

Spring web request interceptor that binds a Hibernate Session to the thread for the entire processing of the request.

This class is a concrete expression of the "Open Session in View" pattern, which is a pattern that allows for the lazy loading of associations in web views despite the original transactions already being completed.

This interceptor makes Hibernate Sessions available via the current thread, which will be autodetected by transaction managers. It is suitable for service layer transactions via HibernateTransactionManager as well as for non-transactional execution (if configured appropriately).

NOTE: This interceptor will by default not flush the Hibernate Session, with the flush mode being set to FlushMode.NEVER. It assumes that it will be used in combination with service layer transactions that handle the flushing: the active transaction manager will temporarily change the flush mode to FlushMode.AUTO during a read-write transaction, with the flush mode reset to FlushMode.NEVER at the end of each transaction. If you intend to use this interceptor without transactions, consider changing the default flush mode (through the "flushMode" property).

In contrast to OpenSessionInViewFilter, this interceptor is configured in a Spring application context and can thus take advantage of bean wiring..

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 with already loaded instances of the same objects.

Since:

3.1

Author:

Juergen Hoeller

See Also:

#setSingleSession, #setFlushMode, OpenSessionInViewFilter, HibernateTransactionManager, TransactionSynchronizationManager

Field Summary

protected Log	logger
static String	PARTICIPATE_SUFFIX Suffix that gets appended to the SessionFactory toString() representation for the "participate in existing session handling" request attribute.

Constructor Summary

OpenSessionInViewInterceptor()

Method Summary

void	afterCompletion(WebRequest request, Exception ex) Unbind the Hibernate Session from the thread and close it).
protected String	getParticipateAttributeName() Return the name of the request attribute that identifies that a request is already intercepted.
SessionFactory	getSessionFactory()
protected Session	openSession() Open a Session for the SessionFactory that this interceptor uses.
void	postHandle(WebRequest request, ModelMap model) Intercept the execution of a request handler after its successful invocation, right before view rendering (if any).
void	preHandle(WebRequest request) Open a new Hibernate Session according to the settings of this HibernateAccessor and bind it to the thread via the TransactionSynchronizationManager.
void	setSessionFactory(SessionFactory sessionFactory)

Methods inherited from class java.lang.Object

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

Field Detail

PARTICIPATE_SUFFIX

public static final String PARTICIPATE_SUFFIX

Suffix that gets appended to the SessionFactory toString() representation for the "participate in existing session handling" request attribute.

See Also:

getParticipateAttributeName(), Constant Field Values

logger

protected final Log logger

Constructor Detail

OpenSessionInViewInterceptor

public OpenSessionInViewInterceptor()

Method Detail

setSessionFactory

public void setSessionFactory(SessionFactory sessionFactory)

getSessionFactory

public SessionFactory getSessionFactory()

preHandle

public void preHandle(WebRequest request)
               throws DataAccessException

Open a new Hibernate Session according to the settings of this HibernateAccessor and bind it to the thread via the TransactionSynchronizationManager.

Specified by:

preHandle in interface WebRequestInterceptor

Parameters:

request - the current web request

Throws:

DataAccessException

postHandle

public void postHandle(WebRequest request,
                       ModelMap model)

Description copied from interface: WebRequestInterceptor

Intercept the execution of a request handler after its successful invocation, right before view rendering (if any).

Allows for modifying context resources after successful handler execution (for example, flushing a Hibernate Session).

Specified by:

postHandle in interface WebRequestInterceptor

Parameters:

request - the current web request

model - the map of model objects that will be exposed to the view (may be null). Can be used to analyze the exposed model and/or to add further model attributes, if desired.

afterCompletion

public void afterCompletion(WebRequest request,
                            Exception ex)
                     throws DataAccessException

Unbind the Hibernate Session from the thread and close it).

Specified by:

afterCompletion in interface WebRequestInterceptor

Parameters:

request - the current web request

ex - exception thrown on handler execution, if any

Throws:

DataAccessException

See Also:

TransactionSynchronizationManager

openSession

protected Session openSession()
                       throws DataAccessResourceFailureException

Open a Session for the SessionFactory that this interceptor uses.

The default implementation delegates to the SessionFactory.openSession method and sets the Session's flush mode to "MANUAL".

Returns:

the Session to use

Throws:

DataAccessResourceFailureException - if the Session could not be created

See Also:

FlushMode.MANUAL

getParticipateAttributeName

protected String getParticipateAttributeName()

Return the name of the request attribute that identifies that a request is already intercepted.

The default implementation takes the toString() representation of the SessionFactory instance and appends PARTICIPATE_SUFFIX.