New returns a Cache wrapping constructor such that resources returned from Require are shared between all calls to Require with the same options, if shared is set to true.

ErrDisposableSizeNotSupported should be returned from DiskSize() and MemorySize() if said feature is not supported.

A Cache is an object that wraps a constructor and manages the life-cycle of objects.

Handle holds a reference to a Resource until Release() is called.

Context for creation of resources.

A Resource that can be cached must also be disposable.

A Constructor is function that given options creates a resource.