mlcache

type CacheStatus struct {

	// if found the key
	Found bool

	// if the val staled
	Stale bool

	// CacheFlag: L1/L2/L3
	CacheFlag string
}

type GetCacheHandler func(string, interface{}) (interface{}, bool, error)

type KeyLock struct {
	Mu   *sync.Mutex
	Lock map[string]chan struct{}
}

type LC struct {
	GetCacheHandler GetCacheHandler

	SetCacheHandler SetCacheHandler
}

type MLCache interface {
	Get(string, Opt, interface{}) (interface{}, CacheStatus, error)
}

type Opt struct {
	// the ttl of key life cycle
	Ttl time.Duration

	Timeout time.Duration

	// L2 cache handler
	L2 *LC

	// L3 cache handler
	L3 *LC
}

type SetCacheHandler func(string, interface{}, time.Duration, interface{}) error