org.springframework.orm.jpa.support

Class OpenEntityManagerInViewInterceptor

java.lang.Object

org.springframework.orm.jpa.EntityManagerFactoryAccessor

org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor

All Implemented Interfaces:

Aware, BeanFactoryAware, AsyncWebRequestInterceptor, WebRequestInterceptor

public class OpenEntityManagerInViewInterceptor
extends EntityManagerFactoryAccessor
implements 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 and Description
static java.lang.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 and Description
OpenEntityManagerInViewInterceptor()

Method Summary

Modifier and Type	Method and Description
void	afterCompletion(WebRequest request, java.lang.Exception ex) Callback after completion of request processing, that is, after rendering the view.
void	afterConcurrentHandlingStarted(WebRequest request) Called instead of postHandle and afterCompletion, when the the handler started handling the request concurrently.
private boolean	applyCallableInterceptor(WebAsyncManager asyncManager, java.lang.String key)
private boolean	decrementParticipateCount(WebRequest request)
protected java.lang.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, getPersistenceUnitName, getTransactionalEntityManager, setBeanFactory, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap, setPersistenceUnitName

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 java.lang.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

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,
                            java.lang.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

decrementParticipateCount

private boolean decrementParticipateCount(WebRequest request)

afterConcurrentHandlingStarted

public void afterConcurrentHandlingStarted(WebRequest request)

Description copied from interface: AsyncWebRequestInterceptor

Called instead of postHandle and afterCompletion, when the the handler started handling the request concurrently.

Specified by:

afterConcurrentHandlingStarted in interface AsyncWebRequestInterceptor

Parameters:

request - the current request

getParticipateAttributeName

protected java.lang.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

applyCallableInterceptor

private boolean applyCallableInterceptor(WebAsyncManager asyncManager,
                                         java.lang.String key)