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	Description
`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
Constructors
Constructor Description
OpenEntityManagerInViewInterceptor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`afterCompletion(WebRequest request, 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.
`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, 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 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,
                            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
  - 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 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

Class OpenEntityManagerInViewInterceptor

Field Summary

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Field Detail

PARTICIPATE_SUFFIX

Constructor Detail

OpenEntityManagerInViewInterceptor

Method Detail

preHandle

postHandle

afterCompletion

afterConcurrentHandlingStarted

getParticipateAttributeName