remove unused code

common/event/event.go

@@ -1,46 +0,0 @@
-package event
-
-import "sync"
-
-type Event uint16
-
-type Handler func(data interface{}) error
-
-type Registry interface {
-	On(Event, Handler)
-}
-
-type Listener struct {
-	sync.RWMutex
-	events map[Event][]Handler
-}
-
-func (l *Listener) On(e Event, h Handler) {
-	l.Lock()
-	defer l.Unlock()
-
-	if l.events == nil {
-		l.events = make(map[Event][]Handler)
-	}
-
-	handlers := l.events[e]
-	handlers = append(handlers, h)
-	l.events[e] = handlers
-}
-
-func (l *Listener) Fire(e Event, data interface{}) error {
-	l.RLock()
-	defer l.RUnlock()
-
-	if l.events == nil {
-		return nil
-	}
-
-	for _, h := range l.events[e] {
-		if err := h(data); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}