我可以根据golang中的字符串实例化不同的类型吗？

Question

I want to implement MVC in golang. But it seems like hard to achieve what I want. in Testcontroller.go I have:

func (c *TestController) Test() {
    //
}

func (c *TestController) Index() {
    //
}

With only a controller, I can use reflect.ValueOf(TestController{}).MethodByName().Call() to execute that function. now I want to add another controller. but It seems like I can't new different instance by different string:

controllerName := strings.Split(r.URL.Path, "/")
controller = reflect.ValueOf(controllerName[1])

I know this is totaly wrong, but I hope I can get a TestController instance if controllerName == "Test" and get a IndexController instance if controllerName == "Index", using reflect seems can't achieve what I want. Is there any way to do is? Thank you very much!

Answer 1

You could do something like that:

Define an interface for your controllers:

type Controller interface {
   // Route returns the root route for that controller
   Route() string
}

In a controller just implement it:

// this tells our app what's the route for this controller
func (c *TestController) Route() string {
    return "test"
}

func (c *TestController) Test() {
    //
}

func (c *TestController) Index() {
    //
}

In our app, create a registry of your controllers, and you can look them up:

var controllers = make([]Controller, 0)

// register them somehow

And now in the serving process:

// assuming the path is /<controller>/<method>
controllerName := strings.Split(r.URL.Path, "/")

// again, you can use a map here, but for a few controllers it's not worth it probably
for _, c := range controllers {
    if c.Route() == controllerName[1] {

       // do what you did in the single controller example
       callControllerWithReflection(c, controllerName[2])
    }
}