Well there is one caveat, an PolicySpi object is encapsulated, so I need
two more SPI's, for DynamicPolicy and RevokableDynamicPolicy and then an
internal enum singleton pattern to tie together the implementation to
return the same instance, which has to be threadsafe.
So the sequence goes lookup SPI's in this order, depending upon required
functionality, each SPI provides only its subset, however the same
instance must be called:
1. Policy
2. DynamicPolicy
3. RevokableDynamicPolicy
I could change the interface name to:
DynamicPolicy
DynamicPolicyRevokeable
Cheers,
Peter.
