Basic 1 to 1 command handler separation example

command_handler_pattern.go

package command_handler_pattern

import (
	"reflect"
)

type NotificationHandler[TNotification any] interface {
	Handle(notification TNotification) error
}

var notificationHandlers map[string]interface{} = make(map[string]interface{})

func RegisterNotificationHandler[TNotification any](notification TNotification, handler NotificationHandler[TNotification]) {
	notificationHandlers[typeOf(notification).Name()] = handler
}

func Send[T any](request T) {
	t := reflect.TypeOf(request).Name()
	handler := notificationHandlers[t]
	handlerValue := handler.(NotificationHandler[T])
	handlerValue.Handle(request)
}

func typeOf(v interface{}) reflect.Type {
	return reflect.TypeOf(v)
}