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java.lang.Object org.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 java.lang.String |
DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAME
|
private java.lang.String |
entityManagerFactoryBeanName
|
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 EntityManager |
createEntityManager(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 java.lang.String |
getEntityManagerFactoryBeanName()
Return the bean name of the EntityManagerFactory to fetch from Spring's root application context. |
protected EntityManagerFactory |
lookupEntityManagerFactory()
Look up the EntityManagerFactory that this filter should use. |
protected EntityManagerFactory |
lookupEntityManagerFactory(HttpServletRequest request)
Look up the EntityManagerFactory that this filter should use, taking the current HTTP request as argument. |
void |
setEntityManagerFactoryBeanName(java.lang.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 java.lang.String DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAME
private java.lang.String entityManagerFactoryBeanName
Constructor Detail |
---|
public OpenEntityManagerInViewFilter()
Method Detail |
---|
public void setEntityManagerFactoryBeanName(java.lang.String entityManagerFactoryBeanName)
DEFAULT_PERSISTENCE_MANAGER_FACTORY_BEAN_NAME
protected java.lang.String getEntityManagerFactoryBeanName()
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, java.io.IOException
OncePerRequestFilter
doFilter
, 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 OncePerRequestFilter
ServletException
java.io.IOException
protected EntityManagerFactory lookupEntityManagerFactory(HttpServletRequest request)
Default implementation delegates to the lookupEntityManagerFactory
without arguments.
lookupEntityManagerFactory()
protected EntityManagerFactory lookupEntityManagerFactory()
getEntityManagerFactoryBeanName()
protected EntityManager createEntityManager(EntityManagerFactory emf)
Can be overridden in subclasses.
emf
- the EntityManagerFactory to usejavax.persistence.EntityManagerFactory#createEntityManager()
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