Lookup the value for key k If the value is in the cache, return it.
Lookup the value for key k If the value is in the cache, return it. Otherwise, insert the value v and return it
Note: This method does not guarantee that v will be in the cache when it returns
the cached value keyed to k or the computed value of v
Insert the value v (keyed by k) into the cache
Lookup the value for key k
Remove k from the cache
A Cache Strategy that completely ignores caching and always returns the input object Operations on this cache execute in O(1) time
(Since version 1.2) This will be removed in favor of a pluggable cache in 2.0