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java.lang.Objectorg.springframework.web.filter.GenericFilterBean
org.springframework.web.filter.OncePerRequestFilter
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter
public class OpenEntityManagerInViewFilter
Servlet 2.3 Filter 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 filter 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.
 
Looks up the EntityManagerFactory in Spring's root web application context.
 Supports a "entityManagerFactoryBeanName" filter init-param in web.xml;
 the default bean name is "entityManagerFactory". Looks up the EntityManagerFactory
 on each request, to avoid initialization order issues (when using ContextLoaderServlet,
 the root application context will get initialized after this filter).
OpenEntityManagerInViewInterceptor, 
JpaInterceptor, 
JpaTransactionManager, 
JpaTemplate.execute(org.springframework.orm.jpa.JpaCallback), 
SharedEntityManagerCreator, 
TransactionSynchronizationManager| Field Summary | |
|---|---|
| static String | DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAME | 
| Fields inherited from class org.springframework.web.filter.OncePerRequestFilter | 
|---|
| ALREADY_FILTERED_SUFFIX | 
| Fields inherited from class org.springframework.web.filter.GenericFilterBean | 
|---|
| logger | 
| Constructor Summary | |
|---|---|
| OpenEntityManagerInViewFilter() | |
| Method Summary | |
|---|---|
| protected  javax.persistence.EntityManager | createEntityManager(javax.persistence.EntityManagerFactory emf)Create a JPA EntityManager to be bound to a request. | 
| protected  void | doFilterInternal(HttpServletRequest request,
                 HttpServletResponse response,
                 FilterChain filterChain)Same contract as for doFilter, but guaranteed to be
 just invoked once per request. | 
| protected  String | getEntityManagerFactoryBeanName()Return the bean name of the EntityManagerFactory to fetch from Spring's root application context. | 
| protected  javax.persistence.EntityManagerFactory | lookupEntityManagerFactory()Look up the EntityManagerFactory that this filter should use. | 
| protected  javax.persistence.EntityManagerFactory | lookupEntityManagerFactory(HttpServletRequest request)Look up the EntityManagerFactory that this filter should use, taking the current HTTP request as argument. | 
|  void | setEntityManagerFactoryBeanName(String entityManagerFactoryBeanName)Set the bean name of the EntityManagerFactory to fetch from Spring's root application context. | 
| Methods inherited from class org.springframework.web.filter.OncePerRequestFilter | 
|---|
| doFilter, getAlreadyFilteredAttributeName, shouldNotFilter | 
| Methods inherited from class org.springframework.web.filter.GenericFilterBean | 
|---|
| addRequiredProperty, afterPropertiesSet, destroy, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setServletContext | 
| Methods inherited from class java.lang.Object | 
|---|
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
| Field Detail | 
|---|
public static final String DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAME
| Constructor Detail | 
|---|
public OpenEntityManagerInViewFilter()
| Method Detail | 
|---|
public void setEntityManagerFactoryBeanName(String entityManagerFactoryBeanName)
DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAMEprotected String getEntityManagerFactoryBeanName()
protected void doFilterInternal(HttpServletRequest request,
                                HttpServletResponse response,
                                FilterChain filterChain)
                         throws ServletException,
                                IOException
OncePerRequestFilterdoFilter, but guaranteed to be
 just invoked once per request. Provides HttpServletRequest and
 HttpServletResponse arguments instead of the default ServletRequest
 and ServletResponse ones.
doFilterInternal in class OncePerRequestFilterServletException
IOExceptionprotected javax.persistence.EntityManagerFactory lookupEntityManagerFactory(HttpServletRequest request)
Default implementation delegates to the lookupEntityManagerFactory
 without arguments.
lookupEntityManagerFactory()protected javax.persistence.EntityManagerFactory lookupEntityManagerFactory()
getEntityManagerFactoryBeanName()protected javax.persistence.EntityManager createEntityManager(javax.persistence.EntityManagerFactory emf)
Can be overridden in subclasses.
emf - the EntityManagerFactory to useEntityManagerFactory.createEntityManager()| 
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