redesign the execution function signature

[plastikfan]

The current function/interface needs a rework. Found a Golang Uk YouTube video (Golang UK Conference 2016 - Mat Ryer - Idiomatic Go Tricks, go to 8:20 function type alternatives for single method interfaces) that discusses this which I think can be well utilised here:

http.Handler has a counterpart called http.HandlerFunc

// in net.http
type Handler interface {
	ServeHTTP(ResponseWriter, *Request)
}

// The HanderFUnc type is an adapter to allow the use of ordinary functions
// as HTTP handlers. If f is a function with the appropriate signature, HandlerFunc(f) is
// a Handler that calls f
type HandlerFunc func(ResponseWriter, *Request)

// ServerHTTP calls f(w,r)
func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) {
	f(w, r)
}

this is intriguing and a technique I've not discovered before (defining a method on a function)

• func type with matching signature
• Method on that func implementing the interface
• Method just calls the func
• Now you don't even need a struct, you can just use a function
• this pattern can be used when you have single method interfaces