Is it mandatory for the controller to have methods for handling interactions with the user or other system components?

In application architecture, such as MVC (Model-View-Controller), the controller is usually responsible for handling user interactions and coordinating between the model and the view. However, it is not always necessary for the controller to have methods for handling all interactions directly.

In some cases, the controller may delegate event handling to other components or services, especially if the interaction logic is complex or requires separation of concerns. The main point is that the controller should serve as a link between the user interface and the business logic.

Therefore, the controller should have methods for handling interactions, but their specific set and implementation depend on the architecture and requirements of the application.