如何基于属性更改在golang中调用函数？

Question

Sample code : https://play.golang.org/p/vl3xwMWf5G

In the above code, I am making sure that, we don't unnecessarily call the LocateBasket function. It is called only once during the GetBasketCall. But if there is any attribute change (For eg. The quantity was changed to 30) then I wanted to make sure that when user calls GetBasket it internally calls LocateBasket function too.

In my example I had only one function, but if there is multiple attributes which needs to be re-calculated (based on attribute change) when their corresponding Getter Functions are getting called, what is the best approach to do the same.

Answer 1

Write a setter method, and either immediately LocateBasket or flag it for GetBasket to do:

func (ball *Ball) SetQuantity(n int){
  ball.Quantity = n
  // ball.LocateBasket(ball)
  ball.dirty = true
}

func (ball *Ball) GetBasket() BasketType {
  if ball.dirty{
    ball.LocateBasket(ball)
    ball.dirty = false
    return ball.basket
}