cache

type Cache interface {
	// Insert the string k
	Insert(k string, v string)
	// Exists proves the existence or lack-thereof of the item k in the cache
	Exists(k string) (exists bool)
	// Get returns the value of the key in the cache
	Get(k string) (value string, err error)
	// SetExpiration sets the expiration on the given item k without updating the value
	SetExpiration(k string, t time.Duration) error
}