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OpenEntityManagerInViewInterceptor (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.orm.jpa.support
Class OpenEntityManagerInViewInterceptor

java.lang.Object
  org.springframework.orm.jpa.EntityManagerFactoryAccessor
      org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor

All Implemented Interfaces:

WebRequestInterceptor

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public class OpenEntityManagerInViewInterceptor
extends EntityManagerFactoryAccessor
implements WebRequestInterceptor

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. It inherits common JPA configuration properties from JpaAccessor, to be configured in a bean definition.

Since:

2.0

Author:

Juergen Hoeller

See Also:

OpenEntityManagerInViewFilter, JpaInterceptor, JpaTransactionManager, JpaTemplate.execute(org.springframework.orm.jpa.JpaCallback), SharedEntityManagerCreator, TransactionSynchronizationManager

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Field Summary
static 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
OpenEntityManagerInViewInterceptor()

 

Method Summary
void	afterCompletion(WebRequest request, Exception ex)           Callback after completion of request processing, that is, after rendering the view.
protected  String	getParticipateAttributeName()           Return the name of the request attribute that identifies that a request is already filtered.
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)           Intercept the execution of a request handler before its invocation.

 

Methods inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor
createEntityManager, getEntityManagerFactory, getJpaPropertyMap, getTransactionalEntityManager, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap

 

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 EntityManagerFactory toString representation for the "participate in existing entity manager handling" request attribute.

See Also:

getParticipateAttributeName(), Constant Field Values

Constructor Detail

OpenEntityManagerInViewInterceptor

public OpenEntityManagerInViewInterceptor()

Method Detail

preHandle

public void preHandle(WebRequest request)
               throws DataAccessException

Description copied from interface: WebRequestInterceptor

Intercept the execution of a request handler before its invocation.

Allows for preparing context resources (such as a Hibernate Session) and expose them as request attributes or as thread-local objects.

Specified by:

preHandle in interface WebRequestInterceptor

Parameters:

request - the current web request

Throws:

DataAccessException

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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.

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afterCompletion

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

Description copied from interface: WebRequestInterceptor

Callback after completion of request processing, that is, after rendering the view. Will be called on any outcome of handler execution, thus allows for proper resource cleanup.

Note: Will only be called if this interceptor's preHandle method has successfully completed!

Specified by:

afterCompletion in interface WebRequestInterceptor

Parameters:

request - the current web request

ex - exception thrown on handler execution, if any

Throws:

DataAccessException

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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

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