Package org.springframework.orm.jpa.support

Class OpenEntityManagerInViewInterceptor

java.lang.Object

org.springframework.orm.jpa.EntityManagerFactoryAccessor

org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor

All Implemented Interfaces:

org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanFactoryAware, org.springframework.web.context.request.AsyncWebRequestInterceptor, org.springframework.web.context.request.WebRequestInterceptor

public class OpenEntityManagerInViewInterceptor
extends EntityManagerFactoryAccessor
implements org.springframework.web.context.request.AsyncWebRequestInterceptor

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

This interceptor makes JPA EntityManagers available via the current thread, which will be autodetected by transaction managers. It is suitable for service layer transactions via JpaTransactionManager or JtaTransactionManager as well as for non-transactional read-only execution.

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

Since:

2.0

Author:

Juergen Hoeller

See Also:

• OpenEntityManagerInViewFilter
• JpaTransactionManager
• SharedEntityManagerCreator
• TransactionSynchronizationManager

Field Summary

Fields

Modifier and Type	Field	Description
static final String	PARTICIPATE_SUFFIX	Suffix that gets appended to the EntityManagerFactory toString representation for the "participate in existing entity manager handling" request attribute.

Fields inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor

logger

Constructor Summary

Constructors

Constructor	Description
OpenEntityManagerInViewInterceptor()

Method Summary

Modifier and Type	Method	Description
void	afterCompletion(org.springframework.web.context.request.WebRequest request, Exception ex)
void	afterConcurrentHandlingStarted(org.springframework.web.context.request.WebRequest request)
protected String	getParticipateAttributeName()	Return the name of the request attribute that identifies that a request is already filtered.
void	postHandle(org.springframework.web.context.request.WebRequest request, org.springframework.ui.ModelMap model)
void	preHandle(org.springframework.web.context.request.WebRequest request)

Methods inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor

createEntityManager, getEntityManagerFactory, getJpaPropertyMap, getPersistenceUnitName, getTransactionalEntityManager, obtainEntityManagerFactory, setBeanFactory, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap, setPersistenceUnitName

Methods inherited from class java.lang.Object

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

Field Details

PARTICIPATE_SUFFIX

public static final String PARTICIPATE_SUFFIX

Suffix that gets appended to the EntityManagerFactory toString representation for the "participate in existing entity manager handling" request attribute.

See Also:

• getParticipateAttributeName()
• Constant Field Values

Constructor Details

OpenEntityManagerInViewInterceptor

public OpenEntityManagerInViewInterceptor()

Method Details

preHandle

public void preHandle(org.springframework.web.context.request.WebRequest request)
               throws org.springframework.dao.DataAccessException

Specified by:

preHandle in interface org.springframework.web.context.request.WebRequestInterceptor

Throws:

org.springframework.dao.DataAccessException

postHandle

public void postHandle(org.springframework.web.context.request.WebRequest request,
 @Nullable
 org.springframework.ui.ModelMap model)

Specified by:

postHandle in interface org.springframework.web.context.request.WebRequestInterceptor

afterCompletion

public void afterCompletion(org.springframework.web.context.request.WebRequest request,
 @Nullable
 Exception ex)
                     throws org.springframework.dao.DataAccessException

Specified by:

afterCompletion in interface org.springframework.web.context.request.WebRequestInterceptor

Throws:

org.springframework.dao.DataAccessException

afterConcurrentHandlingStarted

public void afterConcurrentHandlingStarted(org.springframework.web.context.request.WebRequest request)

Specified by:

afterConcurrentHandlingStarted in interface org.springframework.web.context.request.AsyncWebRequestInterceptor

getParticipateAttributeName

protected String getParticipateAttributeName()

Return the name of the request attribute that identifies that a request is already filtered. Default implementation takes the toString representation of the EntityManagerFactory instance and appends ".FILTERED".

See Also:

• PARTICIPATE_SUFFIX