Hooks and Cache

[eluser]seantaylor[/eluser]
I call a function inside the parent controller so it executes no matter what function is called for that controller. However, when I enable caching for a function (i.e. index) the function inside the parent controller is bypassed when that page is viewed. I assume I can still call a function using hooks but I was wondering at what stage to make such a call (i.e. pre_controller & post_controller).