An AbstractCacheAdministrator defines an abstract cache administrator, implementing all
the basic operations related to the configuration of a cache, including assigning
any configured event handlers to cache objects.
Extend this class to implement a custom cache administrator.
This exception is thrown when retrieving an item from cache and it is
expired.
Note that for fault tolerance purposes, it is possible to retrieve the
current cached object from the exception.
January, 2004 - The OSCache developers are aware of the fact that throwing
an exception for a perfect valid situation (cache miss) is design smell.