Class HttpSessionMutexListener

  extended by org.springframework.web.util.HttpSessionMutexListener
All Implemented Interfaces:
EventListener, HttpSessionListener

public class HttpSessionMutexListener
extends Object
implements HttpSessionListener

Servlet 2.3 HttpSessionListener that automatically exposes the session mutex when an HttpSession gets created. To be registered as a listener in web.xml.

The session mutex is guaranteed to be the same object during the entire lifetime of the session, available under the key defined by the SESSION_MUTEX_ATTRIBUTE constant. It serves as a safe reference to synchronize on for locking on the current session.

In many cases, the HttpSession reference itself is a safe mutex as well, since it will always be the same object reference for the same active logical session. However, this is not guaranteed across different servlet containers; the only 100% safe way is a session mutex.

Juergen Hoeller
See Also:
WebUtils.SESSION_MUTEX_ATTRIBUTE, WebUtils.getSessionMutex(javax.servlet.http.HttpSession), AbstractController.setSynchronizeOnSession(boolean)

Constructor Summary
Method Summary
 void sessionCreated(HttpSessionEvent event)
 void sessionDestroyed(HttpSessionEvent event)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public HttpSessionMutexListener()
Method Detail


public void sessionCreated(HttpSessionEvent event)
Specified by:
sessionCreated in interface HttpSessionListener


public void sessionDestroyed(HttpSessionEvent event)
Specified by:
sessionDestroyed in interface HttpSessionListener