Cancel On Page Transition User Exit

Our JSF application architecture defines two types of pages:
a) Main pages
b) Pop-ups
The architecture requires that main-page bean state be saved in session across invocation of a pop-up, but not when transitioning to another main page. This cannot be accomplished in the current EGL implementation without having to explicitly save, restore, and clear page handler variables.

Our study of EGL runtime makes us believe that this architecture can be implemented at low cost by providing a user exit to dynamically modify the 'cancelOnPageTransition' setting for a page based on the target page. The scenario would be:

a) Specify following handler attributes for main pages: { scope=session, cancelOnPageTransition=yes }
b) On each page transition, use a modified user exit to reset cancelOnPageTransition as required based on the target page

Implementation :

Here is an example of a user exit that would meet the requirement. It should be invoked at each point at which the cancelOnPageTransition attribute determines whether a page bean should be removed from session data.

package com.ibm.javart.resources;
/**
* User exit - change cancelOnPageTransition setting based on page transition target
*
*/
public class PageTransitionExit {
static public boolean getCancelOnPageTransition (boolean cancelOnPageTransition, String targetViewId, String lastRenderedViewId) {
return ( cancelOnPageTransition ) ;
}
}