PROBLEM

Anytime the dean would like to view a particular teachers gradebook they would simply add themselves to "<Teacher Name Math Class>" memberrole via a custom implementation of DNN's orginal SecurityRoles.ascx. The page is redirected to itself so the TabModuleList can be rebuilt taking into account the new adjustments in the MemberRoles. This all works, but the TAB MODULE LIST BUILT UPON MEMBERROLE(S) does not take instantly. There is up to a 30 second delay. You can continue to hit refresh over & over & it will eventually work. This is not exceptable, it needs to be instantly.

SCENARIO

School Teacher Grade Books

DNN Module - Gradebook

    One instance of this module is created per teacher. The moduleSettings save the name of the teacher so that instance of the module can record grades for only that teacher's students.

DNN Tab

    If there are 10 teachers, each one of those teachers will have there own module instance on a particular tab.

Users

     Each of the 10 teachers will have a DNN login & 1 dean/principle will have a login

MemberRoles

    - Each of the 10 teachers will have a MemberRole names something like "<Teacher Name Math Class>"

    - Each of those teacher module instances will the "<Teacher Name Math Class>" memberrole assigned with VIEW permissions

NOT THE PROBLEM

I. Caching

    a. I clear the "GetPortalTabModules<TABID>" cache after the changes & before redirect to self. It's not this caching

    b. I have even tried performing an entire DataCache.ClearHostCache(true)

II. Adding Dean user to "<Teacher Name Math Class>" memberrole

    a. This is instant; I know this because I can monitor it with another browser & see the effects instantly.

NOTE:

    I'm using DNN 3.1 for this

I agree with your gut feeling also. Here is the reason why I'm making this so complicated with using
A single Module Instance & memberRole per teacher
DNN Search Indexing!
Each module instance implements the ISearch interface to have it's Students, Grades, etc indexed by DNN. When a teacher searches the site, the only get results pertaining to there grade book. When the Dean uses the search, he will only get results pertaining to the Gradebooks he is currently searching.
This is a powerful functionality I would like to use. At this time, it works great once the Dean adds himself to the proper memberRole to access the correct GradeBook. The way it works now, the Dean gets irritated that it takes so long for him to access different GradeBooks.

Got it! In DNN 3.1.* - If a non-superuser w/authentication adds themselves to a memberrole it will not take effect until the "portalroles" cookie expires. DNNMembership seems to set this expiration for 1 minute.