cache

type Manager[K comparable, V any] interface {
	Load(key K) Ref[V]
	// Delete marks key as expired.
	Delete(key K) bool
	// Len returns current amount of keys in cache.
	Len() int
	// Cleanup starts scanning for expired values
	// and removes deleted values from storage.
	Cleanup() int
}

type Ref[T any] interface {
	futures.Future[T]
	Release()
}

type Storage[K comparable, V any] interface {
	Get(key K) (V, error)
	Actual(key K, value V) bool
	Delete(key K, value V) error
}