Add events

event/local_broker.go

@@ -0,0 +1,34 @@
+package event
+
+import "sync"
+
+type localBroker struct {
+	sync.Mutex
+
+	handlers map[EventType][]Handler
+}
+
+func NewLocalBroker() *localBroker {
+	return &localBroker{handlers: map[EventType][]Handler{}}
+}
+
+func (b *localBroker) On(name EventType, handler Handler) {
+	b.Lock()
+	defer b.Unlock()
+
+	if b.handlers[name] == nil {
+		b.handlers[name] = []Handler{}
+	}
+	b.handlers[name] = append(b.handlers[name], handler)
+}
+
+func (b *localBroker) Emit(name EventType, args ...interface{}) {
+	b.Lock()
+	defer b.Unlock()
+
+	if b.handlers[name] != nil {
+		for _, handler := range b.handlers[name] {
+			handler(args...)
+		}
+	}
+}