Class HttpSessionMutexListener

java.lang.Object
org.springframework.web.util.HttpSessionMutexListener
All Implemented Interfaces:
jakarta.servlet.http.HttpSessionListener, EventListener
public class HttpSessionMutexListener extends Object implements jakarta.servlet.http.HttpSessionListener
Servlet 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.

Since:
1.2.7
Author:
Juergen Hoeller
See Also:

  • Constructor Details

    • HttpSessionMutexListener

      public HttpSessionMutexListener()

  • Method Details

    • sessionCreated

      public void sessionCreated(jakarta.servlet.http.HttpSessionEvent event)
      Specified by:
      sessionCreated in interface jakarta.servlet.http.HttpSessionListener

    • sessionDestroyed

      public void sessionDestroyed(jakarta.servlet.http.HttpSessionEvent event)
      Specified by:
      sessionDestroyed in interface jakarta.servlet.http.HttpSessionListener