cache

type Interface interface {
	Has(key string) bool
	Get(key string) (interface{}, bool)
	Set(key string, v interface{}, ttl time.Duration) error
	Add(key string, v interface{}, ttl time.Duration) (bool, error)
	Remove(key string) error
	GetOrSet(key string, getter func() (interface{}, error), ttl time.Duration) (interface{}, error)
	Clear() error
}