ZK Session Timeout

answered 2013-01-23 09:23:17 +0800

dennis
3679 ● 1 ● 6
http://www.javaworld.com....

When user click logout directly, the event is triggered by the user action, so you can do the db-log by controller. If you intent to listen to session-timeout, you have to write a HttpSessionListener and access the database in the listener lifecycle method.

answered 2013-01-23 18:47:08 +0800

rickcr
704 ● 7

updated 2013-01-23 18:47:43 +0800

What you want to use here is a class that implements HttpSessionBindingListener.( For example maybe your User class have it implement the interface.)

Assuming your user was put into the session, when it's about to be removed from the session because the session is going to expire the valueUnbound(HttpSessionBindingEvent event) is called, so you would implement this method in your User class.

and you'd do something like ...

public void valueUnbound(HttpSessionBindingEvent event) {
   User user  = (User)event.getValue();
   someServiceClass.recordTheUserWhosSessionExpired(user);
}

answered 2013-01-24 04:26:25 +0800

rdgrimes
735 ● 7

Another option is to keep your own copy of Sessions (a minimalistic copy), and have a thread that periodically checks it against the live sessions in the Sessions object that the ZK framework is managing. Any session that is not found, you can assume it expired or was abandoned, and record it as such. In this way, you don't have to worry about catching an expired session before ZK wipes out its session data.

I would also wire in a Runtime.addShutdownHook to make sure you run the sessions check before the container shuts down.

Ron