User Level based Validation caching

Question

Hi,
This is with references to JSP/JPDK based portlets.
To implement validation based caching in JSP portlets, the first step I understand is to create our own class that extends JspValidateRenderer and reference this new class in the provider.xml file in the <showPage class=" "> tag for the appropriate Portlet/s.
The questions I had -
1) What do I call to cause a change in the version identifier? Do I call getNewVersion() and
let my implementation of the JspValidateRenderer's getNewVersion()take care of
setting/updating the version identifier? I dont need to take care of storing the version
identifier anywhere - is that correct?
2) How do I implement this if, for eg. events in Portlet A determines if a cached version or a
new version of Portlet B has to be rendered? In my case Portlet A would be a
showDetails page of Portlet A collecting data that drives the content in Portlet B.
So, everytime the html form in Portlet A'showDetails page is submitted, I would like to
refresh Portlet B, otherwise simply use the cached version. How do I change the version
identifier in Portlet B, to cause the Portlet A to not use the cached version?
3) How do I enforce USER level in this model? I didnt see any parameter that accepts the LEVEL in
validation based caching methods.
Appreciate any suggestions/help since this is my first attempt at implementing any form of cahing
regards
-Ananth Makaram

Answer 1

Yes. There will be 20000 instances in the case you have mentioned.
To answer your question "Would that be expensive OR is it a non-issue? "
- The File Cache is built to handle 10 million cache items efficiently. So, This will NOT be an issue for the cache you are mentioning.
- Assuming each of the portlet is about 2k. In your case you'd only have about 40MB in case. Even in very big sites the cache size is only about 2GB per mid-tier
Moreover, Disk space is very Cheap. There are cache clean jobs which clean up the cache regularly to make sure that it does NOT grow to unmanageable proportions.