cache

type Backend interface {
	// Get retrieves v from Backend. The returned v may be the original value. The caller should
	// not modify it.
	Get(key string) (v []byte, storedTime, expirationTime time.Time)

	// Store stores a copy of v into Backend. v cannot be nil.
	// If expirationTime is already passed, Store is a noop.
	Store(key string, v []byte, storedTime, expirationTime time.Time)

	// Closer closes the cache backend. Get and Store should become noop calls.
	io.Closer
}