I have an additional requirement within JBoss Negotiation for the flushing of the cache to be based on a time held in the object held in the cache i.e. I have an expiration time on a ticket and want the cache to expire as or before the ticket expires.  But I don't believe this would be a fixed time for each request.

Configurations we need to think of for the new cache implementation:

• enable/disable cache per security domain
• cache size limit
• expiration time

We also need to make custom principals work when the cache is disabled. As it is today the information about the caller principal is only available when the cache is enabled. When we have a custom principal as the caller principal this all falls apart.