cache

type Cache interface {
	Add(key string, valuer Valuer)
	Get(key string) (valuer Valuer, ok bool)
	Remove(key string)
	Clear()
	Len() int
}

type Valuer interface {
	fmt.Stringer
	Len() int
	Bytes() []byte
	Expire() int64
	SetExpire(timestamp int64)
	GroupName() string
}