Re: [Springframework-developer] OpenSessionInViewFilter

[Les A. H. <le...@ha...>]

It is not recommended to implement this type of behavior in a Hibernate
application.  An application-transaction is scoped to a few connected
request/response cycles and shouldn't be used across a user's entire
interaction with the system - doing otherwise creates much greater
conflict for stale data and versioning conflicts. 

On Sun, 20 Nov 2005 20:29:21 -0500, "Artem Ploujnikov"
<bla...@ca...> said:
>   Some Web application frameworks like JSF might require you to extend
>   the
> lifetime of a persistent entity beyond a single HTTP request. What I am
> proposing is an alternative implementation of OpenSessionInViewFilter
> that
> opens one Hibernate session per HTTP session instead of one session per
> request. JDBC connection management should not be a problem because it is
> possible to disconnect and reconnect Hibernate sessions without closing
> them.
> 
> Here is the filter that I'm using in my application... I think it would
> be a
> good idea to include something similar in a future release of Spring.
> Please
> note that it hasn't been well tested, and it requires a session filter
> that
> closes orphaned sessions.
> 
> public class HibernateSessionFilter extends OncePerRequestFilter {
>  public static final String DEFAULT_SESSION_FACTORY_BEAN_NAME =
> "sessionFactory";
>  public static final String SESSION_KEY = "org.foo.web.hibernateSession";
> 
>  private String sessionFactoryBeanName =
>  DEFAULT_SESSION_FACTORY_BEAN_NAME;
> 
>  /**
>   * @return Returns the sessionFactoryBeanName.
>   */
>  protected String getSessionFactoryBeanName() {
>   return sessionFactoryBeanName;
>  }
> 
> 
>  /**
>   * @param sessionFactoryBeanName The sessionFactoryBeanName to set.
>   */
>  public void setSessionFactoryBeanName(String sessionFactoryBeanName) {
>   this.sessionFactoryBeanName = sessionFactoryBeanName;
>  }
> 
> 
>  protected SessionFactory lookupSessionFactory() {
>   if (logger.isDebugEnabled()) {
>    logger.debug("Using SessionFactory '" + getSessionFactoryBeanName() +
>    "'
> for OpenSessionInViewFilter");
>   }
>   WebApplicationContext wac =
>     WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
>   return (SessionFactory) wac.getBean(getSessionFactoryBeanName(),
> SessionFactory.class);
>  }
> 
>  protected void doFilterInternal(
>    HttpServletRequest request, HttpServletResponse response, FilterChain
> filterChain)
>    throws ServletException, IOException {
>   SessionFactory sessionFactory = lookupSessionFactory();
>   HttpSession httpSession = request.getSession();
>   Session session =
>    (Session) httpSession.getAttribute(SESSION_KEY);
>   if (session == null) {
>    session = sessionFactory.openSession();
>    httpSession.setAttribute(SESSION_KEY, session);
>   }
>                 if (!session.isConnected()) {
>                     session.reconnect();
>                 }
>   TransactionSynchronizationManager.bindResource(sessionFactory, new
> SessionHolder(session));
>   try {
>    filterChain.doFilter(request, response);
>   } finally {
>    TransactionSynchronizationManager.unbindResource(sessionFactory);
>                         session.disconnect();
>   }
> 
>  }
> 
> }
> 
> 
> 
> 
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