Update go-pluggable

vendor/github.com/mudler/go-pluggable/bus.go

@@ -0,0 +1,73 @@
+// Copyright © 2020 Ettore Di Giacinto <mudler@mocaccino.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package pluggable
+
+import (
+	"sync"
+
+	"github.com/chuckpreslar/emission"
+	"github.com/codegangsta/inject"
+)
+
+// Bus represent the bus event system
+type Bus struct {
+	inject.Injector
+	emission.Emitter
+	sync.Mutex
+}
+
+// NewBus returns a new Bus instance
+func NewBus() *Bus {
+	return &Bus{
+		Injector: inject.New(),
+		Emitter:  *emission.NewEmitter(),
+	}
+}
+
+// Listen Binds a callback to an event, mapping the arguments on a global level
+func (a *Bus) Listen(event EventType, listener interface{}) *Bus {
+	a.Lock()
+	defer a.Unlock()
+	a.On(string(event), func() { a.Invoke(listener) })
+	return a
+}
+
+// Publish publishes an event, it does accept only the event as argument, since
+// the callback will have access to the service mapped by the injector
+func (a *Bus) Publish(e *Event) *Bus {
+	a.Lock()
+	defer a.Unlock()
+	a.Map(e)
+	a.Emit(string(e.Name))
+	return a
+}
+
+// OnlyOnce Binds a callback to an event, mapping the arguments on a global level
+// It is fired only once.
+func (a *Bus) OnlyOnce(event EventType, listener interface{}) *Bus {
+	a.Lock()
+	defer a.Unlock()
+	a.Once(string(event), func() { a.Invoke(listener) })
+	return a
+}
+
+func (a *Bus) propagateEvent(p Plugin) func(e *Event) {
+	return func(e *Event) {
+		resp, _ := p.Run(*e)
+		a.Map(&resp)
+		a.Emit(p.Name)
+	}
+}