type Pipe[Payload, Value any] struct {
	Sender              Sender[Payload, Value]
	Receiver            Receiver[Payload, Value]
	OnReceiveCompletion func()
	OnSendCompletion    func()
}

type Receiver[Payload, Value any] interface {
	Receive() bool
	Cancel()
	Status() Status[Value]
	Request() Payload
}

type Request[Payload any] struct {
	Payload  Payload
	Canceled bool
}

type Sender[Payload, Value any] interface {
	Request() Request[Payload]
	Update(v Value)
	Finalize(v Value, err error)
	Status() Status[Value]
}

type Status[Value any] struct {
	Canceled  bool
	Completed bool
	Err       error
	Value     Value
}