NewLocking creates a new Locking cache wrapping inner.

Locking wraps an inner Cache implementation with a mutex, making it safe for concurrent use.

None provides no caching and always calls the provided FillFunc.

Single is a simple in-memory cache that stores a single value until a defined time before it is re-fetched.

Cache is the interface for the cache types in this package.

FillFunc is the signature of a function for filling a cache.