How does ec-cube (Symfony based Ecommerce Platform) controller work?

I want to develop simple plugins for ec-cube and studied ec-cube's structure. Actually it is based on symfony framework but I can't figure out how it's controller works. I have to extend some classes

I know it uses anotation for routing but I want to know when the instances of controller are created and what parameters are passed to them. I mean where in code, the instantiation exists

I tried to search but can't find and am looking for help. What I want is in which file it exist

Thanks in advance

source https://stackoverflow.com/questions/76994794/how-does-ec-cube-symfony-based-ecommerce-platform-controller-work