bog/util/event.go

package util

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(payload interface{})

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.Payload())
	}
}