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OpenPersistenceManagerInViewInterceptor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.orm.jdo.support
Class OpenPersistenceManagerInViewInterceptor

java.lang.Object
  org.springframework.orm.jdo.support.OpenPersistenceManagerInViewInterceptor

All Implemented Interfaces:

WebRequestInterceptor

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public class OpenPersistenceManagerInViewInterceptor
extends Object
implements WebRequestInterceptor

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

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

In contrast to OpenPersistenceManagerInViewFilter, this interceptor is set up in a Spring application context and can thus take advantage of bean wiring. It inherits common JDO configuration properties from JdoAccessor, to be configured in a bean definition.

Since:

1.1

Author:

Juergen Hoeller

See Also:

OpenPersistenceManagerInViewFilter, JdoInterceptor, JdoTransactionManager, PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean), TransactionSynchronizationManager

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Field Summary
protected  Log	logger
static String	PARTICIPATE_SUFFIX           Suffix that gets appended to the PersistenceManagerFactory toString representation for the "participate in existing persistence manager handling" request attribute.

 

Constructor Summary
OpenPersistenceManagerInViewInterceptor()

 

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.
javax.jdo.PersistenceManagerFactory	getPersistenceManagerFactory()           Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.
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.
void	setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf)           Set the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.

 

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 PersistenceManagerFactory toString representation for the "participate in existing persistence manager handling" request attribute.

See Also:

getParticipateAttributeName(), Constant Field Values

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logger

protected final Log logger

Constructor Detail

OpenPersistenceManagerInViewInterceptor

public OpenPersistenceManagerInViewInterceptor()

Method Detail

setPersistenceManagerFactory

public void setPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory pmf)

Set the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.

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getPersistenceManagerFactory

public javax.jdo.PersistenceManagerFactory getPersistenceManagerFactory()

Return the JDO PersistenceManagerFactory that should be used to create PersistenceManagers.

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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 PersistenceManagerFactory instance and appends ".FILTERED".

See Also:

PARTICIPATE_SUFFIX

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