Limiting the no. of users for a particular application in Portal?

Hi,
I want to know how this can be done. Following is the requirement:
1)I have an iView in Portal which is showing some BSP appliation. Now i want to restrict the no of users to only 600 for that particular iView only i.e. even though our portal can have 1000 concurrent users but if 600 concurrent users are already accessing that particular BSP iview, then the 601th user will not be allowed to access that iView & still browse around in portal. So whenevr any user goes out of the BSP application & the values goes less than 600, then only new users can go in.
2) same req as above but for diff kind of iviews i.e. PAR based, WebDynpro etc.
one thing i would like to clear is that the figure of 1000 is actually the portal session & the figure of 600 comes from the Backend sessions.So if the backend seesion through portal reaches 600, i have to stop showing the application,& instead show some message..
Any kind of ideas are welcome..
Regards
Gaurav
Message was edited by: Gaurav Gandhi

Hi Gaurav,
> HttpSession by an HttpSessionBindingListener,
> reacting on valueUnbound
Google is your friend
See http://java.sun.com/products/servlet/2.2/javadoc/javax/servlet/http/HttpSessionBindingListener.html and http://java.sun.com/products/servlet/2.2/javadoc/javax/servlet/http/HttpSession.html - explanation at the class definition as well as for setAttribute.
> if i develop something like a proxy, i would be a very
> probability that with all these manipulation, the
> final iView loading will take time & it will be slow
No. You would have to define the iView as URLIsolated and then redirect by using request.redirect(destinationString) to the original component, passing the parameters as request parameters to the destinationString.
We are just in contact with SAP why the J2EE RequestDispatcher does not work to include and if there at least is a workaround for embedded iViews.
All your proxy iView would do is getting the HttpSession, putting the session (or it's ID) in a static HashSet, registering by this (implementing HttpSessionBindingListener) through setAttribute to the session, reacting on valueUnbound (removing the session/ID from the HashSet) and counting the number of members in the static HashSet. I think this will need about 20 ms (plus redirect).
Hope it helps
Detlev

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