How to reload a custom library

I have created a custom library which depends on session data.

In my main controller i am initializing session values and want to reload custom library based on new values every time page is refreshed.
Hence, i am using session_destroy(); at the end of my controller method.

But on page refresh library are not reloaded : 

Code:

closeOrders class already loaded. Second attempt ignored.

Is there any way i can reload some library again on page refresh.