util folder

util/event.go

@@ -0,0 +1,41 @@
+package dataswamp
+
+type Event struct {
+	eventName string
+	payload interface {}
+}
+
+func NewEvent(eventName string, payload interface{}) *Event{
+	return &Event{
+		eventName,
+		payload,
+	}
+}
+
+func (e *Event) EventName() string {
+	return e.eventName
+}
+
+func (e *Event) Payload() interface{} {
+	return e.payload
+}
+
+type EventHandler func(e Event)
+
+type EventBus struct {
+	handlers map[string][]EventHandler
+}
+
+func NewEventBus() *EventBus{
+	return &EventBus{ make(map[string][]EventHandler) }
+}
+
+func (eb *EventBus) Register(eventName string, handler EventHandler) {
+	eb.handlers[eventName] = append(eb.handlers[eventName], handler)
+}
+
+func (eb *EventBus) Handle(e Event){
+	for _, handler := range eb.handlers[e.EventName()] {
+		handler(e)
+	}
+}

util/logging.go

@@ -0,0 +1,7 @@
+package dataswamp
+
+type Logger interface {
+	Debug(format string, a ...interface{})
+	Info(format string, a ...interface{})
+	Warn(format string, a ...interface{})
+}