package beam

import (
	"errors"
	"os"
)

type Sender interface {
	Send(msg *Message, mode int) (Receiver, Sender, error)
	Close() error
}

type Receiver interface {
	Receive(mode int) (*Message, Receiver, Sender, error)
}

type Message struct {
	Name string
	Args []string
	Att  *os.File
}

const (
	R = 1 << (32 - 1 - iota)
	W
)

type ReceiverFrom interface {
	ReceiveFrom(Receiver) (int, error)
}

type SenderTo interface {
	SendTo(Sender) (int, error)
}

var (
	ErrIncompatibleSender   = errors.New("incompatible sender")
	ErrIncompatibleReceiver = errors.New("incompatible receiver")
)