Implementing use case interactors
Having explored the theoretical foundations of the Application layer, we now turn to practical implementation. Use case interactors are the concrete classes that implement application-specific business rules. The term interactors emphasizes their role in interacting with and coordinating various parts of the system. While the Domain layer defines what the business rules are, interactors define how and when these rules are applied in response to specific application needs. In Python, we can implement these interactors in a way that’s both clean and expressive.
Structuring a use case
A well-designed use case interactor orchestrates domain objects while maintaining clean architectural boundaries. Let’s examine how this is achieved:
@dataclass(frozen=True)
class CompleteTaskUseCase:
"""Use case for marking a task as complete and notifying
stakeholders""...
