cache

type Store interface {
	// Get an item from the cache. Returns the item or nil, and a bool
	// indicating whether the key was found.
	Get(k string) (interface{}, bool)
	// Set adds an item to the cache, replacing any existing item. If the duration is 0
	// (DefaultExpiration), the cache's default expiration time is used. If it is -1
	// (NoExpiration), the item never expires.
	Set(k string, x interface{}, d time.Duration)
	// Delete an item from the cache. Does nothing if the key is not in the cache.
	Delete(k string)
	// Flush deletes all items from the cache.
	Flush()
}