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java.lang.Objectorg.springframework.web.filter.GenericFilterBean
org.springframework.web.filter.OncePerRequestFilter
org.springframework.orm.hibernate4.support.OpenSessionInViewFilter
public class OpenSessionInViewFilter
Servlet 2.3 Filter that binds a Hibernate Session to the thread for the entire processing of the request. Intended for the "Open Session in View" pattern, i.e. to allow for lazy loading in web views despite the original transactions already being completed.
This filter makes Hibernate Sessions available via the current thread, which
will be autodetected by transaction managers. It is suitable for service layer
transactions via HibernateTransactionManager
as well as for non-transactional execution (if configured appropriately).
NOTE: This filter will by default not flush the Hibernate Session,
with the flush mode set to FlushMode.NEVER
. It assumes to be used
in combination with service layer transactions that care for the flushing: The
active transaction manager will temporarily change the flush mode to
FlushMode.AUTO
during a read-write transaction, with the flush
mode reset to FlushMode.NEVER
at the end of each transaction.
WARNING: Applying this filter to existing logic can cause issues that have not appeared before, through the use of a single Hibernate Session for the processing of an entire request. In particular, the reassociation of persistent objects with a Hibernate Session has to occur at the very beginning of request processing, to avoid clashes with already loaded instances of the same objects.
Looks up the SessionFactory in Spring's root web application context.
Supports a "sessionFactoryBeanName" filter init-param in web.xml
;
the default bean name is "sessionFactory". Looks up the SessionFactory on each
request, to avoid initialization order issues (when using ContextLoaderServlet,
the root application context will get initialized after this filter).
lookupSessionFactory(javax.servlet.http.HttpServletRequest)
,
OpenSessionInViewInterceptor
,
HibernateTransactionManager
,
TransactionSynchronizationManager
Field Summary | |
---|---|
static String |
DEFAULT_SESSION_FACTORY_BEAN_NAME
|
Fields inherited from class org.springframework.web.filter.OncePerRequestFilter |
---|
ALREADY_FILTERED_SUFFIX |
Fields inherited from class org.springframework.web.filter.GenericFilterBean |
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logger |
Constructor Summary | |
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OpenSessionInViewFilter()
|
Method Summary | |
---|---|
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 |
getSessionFactoryBeanName()
Return the bean name of the SessionFactory to fetch from Spring's root application context. |
protected SessionFactory |
lookupSessionFactory()
Look up the SessionFactory that this filter should use. |
protected SessionFactory |
lookupSessionFactory(HttpServletRequest request)
Look up the SessionFactory that this filter should use, taking the current HTTP request as argument. |
protected Session |
openSession(SessionFactory sessionFactory)
Open a Session for the SessionFactory that this filter uses. |
void |
setSessionFactoryBeanName(String sessionFactoryBeanName)
Set the bean name of the SessionFactory 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 |
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addRequiredProperty, afterPropertiesSet, destroy, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setEnvironment, 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_SESSION_FACTORY_BEAN_NAME
Constructor Detail |
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public OpenSessionInViewFilter()
Method Detail |
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public void setSessionFactoryBeanName(String sessionFactoryBeanName)
DEFAULT_SESSION_FACTORY_BEAN_NAME
protected String getSessionFactoryBeanName()
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, 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
IOException
protected SessionFactory lookupSessionFactory(HttpServletRequest request)
The default implementation delegates to the lookupSessionFactory()
variant without arguments.
request
- the current request
protected SessionFactory lookupSessionFactory()
The default implementation looks for a bean with the specified name in Spring's root application context.
getSessionFactoryBeanName()
protected Session openSession(SessionFactory sessionFactory) throws DataAccessResourceFailureException
The default implementation delegates to the
SessionFactory.openSession
method and
sets the Session
's flush mode to "MANUAL".
sessionFactory
- the SessionFactory that this filter uses
DataAccessResourceFailureException
- if the Session could not be createdFlushMode.MANUAL
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