Golang Message.Dup方法代碼示例

func (x *bus) broadcast(m *mangos.Message, sender uint32) {

	x.Lock()
	for id, pe := range x.eps {
		if m != nil {
			if sender == id {
				continue
			}
			m = m.Dup()
		}
		select {
		case pe.q <- m:
		default:
			// No room on outbound queue, drop it.
			// Note that if we are passing on a linger/shutdown
			// notification and we can't deliver due to queue
			// full, it means we will wind up waiting the full
			// linger time in the lower sender.  Its correct, if
			// suboptimal, behavior.
			if m != nil {
				m.Free()
			}
		}
	}
	x.Unlock()
}

func (r *req) SendHook(m *mangos.Message) bool {

	if r.raw {
		// Raw mode has no automatic retry, and must include the
		// request id in the header coming down.
		return true
	}
	r.Lock()
	defer r.Unlock()

	// We need to generate a new request id, and append it to the header.
	r.reqid = r.nextID()
	v := r.reqid
	m.Header = append(m.Header,
		byte(v>>24), byte(v>>16), byte(v>>8), byte(v))

	r.reqmsg = m.Dup()

	// Schedule a retry, in case we don't get a reply.
	if r.retry > 0 {
		r.waker.Reset(r.retry)
	} else {
		r.waker.Stop()
	}

	r.sock.SetRecvError(nil)

	return true
}

func (x *star) broadcast(m *mangos.Message, sender *starEp) {

	x.Lock()
	for _, pe := range x.eps {
		if sender == pe {
			continue
		}
		if m != nil {
			m = m.Dup()
		}
		select {
		case pe.q <- m:
		default:
			// No room on outbound queue, drop it.
			if m != nil {
				m.Free()
			}
		}
	}
	x.Unlock()

	// Grab a local copy and send it up if we aren't originator
	if m != nil {
		if sender != nil {
			select {
			case x.sock.RecvChannel() <- m:
			case <-x.sock.CloseChannel():
				m.Free()
				return
			default:
				// No room, so we just drop it.
				m.Free()
			}
		} else {
			// Not sending it up, so we need to release it.
			m.Free()
		}
	}
}

func (x *surveyor) sender() {
	defer x.w.Done()
	sq := x.sock.SendChannel()
	cq := x.sock.CloseChannel()
	for {
		var m *mangos.Message
		select {
		case m = <-sq:
		case <-cq:
			return
		}

		x.Lock()
		for _, pe := range x.peers {
			m := m.Dup()
			select {
			case pe.q <- m:
			default:
				m.Free()
			}
		}
		x.Unlock()
	}
}