go_reflect.go

package main

import (
	"log"
	"reflect"
)

type Room struct {
	name   string
	roomId int
}

type RoomHandler interface {
	PrintRoomName()
	PrintRoomId()
}

type MyAwesomeRoomHandler struct {
	r *Room
}

func (m *MyAwesomeRoomHandler) PrintRoomId() {
	log.Println("MyAwesomeRoomHandler:", m.r.roomId)
}

func (m *MyAwesomeRoomHandler) PrintRoomName() {
	log.Println("MyAwesomeRoomHandler:", m.r.name)
}

func NewMyAwesomeHandler(r *Room) *MyAwesomeRoomHandler {
	return &MyAwesomeRoomHandler{
		r: r,
	}
}

var roomHandlers map[string]reflect.Value

func AddRoomHandler[T any](name string, x T) {
	roomHandlers[name] = reflect.ValueOf(x)
}

func main() {
	roomHandlers = make(map[string]reflect.Value)

	AddRoomHandler("awesome", NewMyAwesomeHandler)

	x := roomHandlers["awesome"]

	r := Room{
		name:   "room-1",
		roomId: 1,
	}

	y := x.Call([]reflect.Value{reflect.ValueOf(&r)})[0].Interface().(RoomHandler)

	y.PrintRoomId()
}