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

所有已实现的接口:
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.
从以下版本开始:
2.0
作者:
Juergen Hoeller
另请参阅:
OpenEntityManagerInViewFilter, JpaTransactionManager, SharedEntityManagerCreator, TransactionSynchronizationManager

字段概要

字段
修饰符和类型	字段	说明
`static String`	`PARTICIPATE_SUFFIX`	Suffix that gets appended to the EntityManagerFactory toString representation for the "participate in existing entity manager handling" request attribute.

从类继承的字段 org.springframework.orm.jpa.EntityManagerFactoryAccessor
logger

构造器概要
构造器
构造器说明
OpenEntityManagerInViewInterceptor()

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`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 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.

从类继承的方法 org.springframework.orm.jpa.EntityManagerFactoryAccessor
createEntityManager, getEntityManagerFactory, getJpaPropertyMap, getPersistenceUnitName, getTransactionalEntityManager, obtainEntityManagerFactory, setBeanFactory, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap, setPersistenceUnitName

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - 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.
    另请参阅:
    getParticipateAttributeName(), 常量字段值
- 构造器详细资料
  - OpenEntityManagerInViewInterceptor
```
public OpenEntityManagerInViewInterceptor()
```
- 方法详细资料
  - preHandle
```
public void preHandle(WebRequest request)
               throws DataAccessException
```
    从接口复制的说明: 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.
    指定者:
    preHandle 在接口中 WebRequestInterceptor
    参数:
    request - the current web request
    抛出:
    DataAccessException
  - postHandle
```
public void postHandle(WebRequest request,
                       @Nullable
                       ModelMap model)
```
    从接口复制的说明: 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).
    指定者:
    postHandle 在接口中 WebRequestInterceptor
    参数:
    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,
                            @Nullable
                            Exception ex)
                     throws DataAccessException
```
    从接口复制的说明: 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!
    指定者:
    afterCompletion 在接口中 WebRequestInterceptor
    参数:
    request - the current web request
    ex - exception thrown on handler execution, if any
    抛出:
    DataAccessException
  - afterConcurrentHandlingStarted
```
public void afterConcurrentHandlingStarted(WebRequest request)
```
    从接口复制的说明: AsyncWebRequestInterceptor
    Called instead of postHandle and afterCompletion, when the handler started handling the request concurrently.
    指定者:
    afterConcurrentHandlingStarted 在接口中 AsyncWebRequestInterceptor
    参数:
    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".
    另请参阅:
    PARTICIPATE_SUFFIX

类 OpenEntityManagerInViewInterceptor

字段概要

从类继承的字段 org.springframework.orm.jpa.EntityManagerFactoryAccessor

构造器概要

方法概要

从类继承的方法 org.springframework.orm.jpa.EntityManagerFactoryAccessor

从类继承的方法 java.lang.Object

字段详细资料

PARTICIPATE_SUFFIX

构造器详细资料

OpenEntityManagerInViewInterceptor

方法详细资料

preHandle

postHandle

afterCompletion

afterConcurrentHandlingStarted

getParticipateAttributeName