Ejemplo n.º 1
0
package orm

import (
	"gnd.la/signals"
)

type ormSignal struct {
	s *signals.Signal
}

func (s *ormSignal) Listen(handler func(o *Orm)) signals.Listener {
	return s.s.Listen(func(data interface{}) {
		handler(data.(*Orm))
	})
}

func (s *ormSignal) emit(o *Orm) {
	s.s.Emit(o)
}

// Signals declares the signals emitted by this package. See
// gnd.la/signals for more information.
var Signals = struct {
	// WillInitialize is emitted just before a gnd.la/orm.Orm is
	// initialized.
	WillInitialize *ormSignal
}{
	&ormSignal{signals.New("will-initialize")},
}
Ejemplo n.º 2
0
		handler(data.(*Message))
	})
}

// emit is unexported, so only this package can emit the signal. Note that
// a package might choose to export Emit too.
func (s *messageSignal) emit(msg *Message) {
	s.s.Emit(msg)
}

// Signals is exported, so package callers can access it and its fields
// as e.g. pkg.Signals.MessageReceived.Listen(...)
var Signals = struct {
	MessageReceived *messageSignal
}{
	&messageSignal{signals.New("message-received")},
}

func ExampleSignal() {
	listener := Signals.MessageReceived.Listen(func(msg *Message) {
		fmt.Println(msg.Text, msg.Timestamp.Unix())
	})
	Signals.MessageReceived.emit(&Message{
		Text:      "hello",
		Timestamp: time.Unix(42, 0),
	})
	listener.Remove()
	// Emitting again won't cause the listener to be called
	// since the listener was removed.
	Signals.MessageReceived.emit(&Message{
		Text:      "hello again",
Ejemplo n.º 3
0
func (s *appSignal) Listen(handler func(app *App)) signals.Listener {
	return s.signal.Listen(func(data interface{}) {
		handler(data.(*App))
	})
}

func (s *appSignal) emit(app *App) {
	s.signal.Emit(app)
}

// Signals declares the signals emitted by this package. See
// gnd.la/signals for more information.
var Signals = struct {
	// WillListen is emitted just before a *gnd.la/app.App will
	// start listening.
	WillListen *appSignal
	// DidListen is emitted after a *gnd.la/app.App starts
	// listening.
	DidListen *appSignal
	// WillPrepare is emitted at the beginning of App.Prepare.
	WillPrepare *appSignal
	// DidPrepare is emitted when App.Prepare ends without errors.
	DidPrepare *appSignal
}{
	WillListen:  &appSignal{signals.New("will-listen")},
	DidListen:   &appSignal{signals.New("did-listen")},
	WillPrepare: &appSignal{signals.New("will-prepare")},
	DidPrepare:  &appSignal{signals.New("did-prepare")},
}