debounce

type AtMostOnceEvent struct {
	Id  string
	Err error
}

type Debouncer interface {
	// Register records the ID for later debouncing.
	Register(wg *sync.WaitGroup, id string)

	// Notify decrements the WaitGroup if the event's ID is registered,
	// otherwise it is dropped.
	// If the ID was registered, the ID is deregistered to avoid future
	// decrements for the same ID.
	Notify(wg *sync.WaitGroup, event AtMostOnceEvent)
}