// This is the "Use Case" layer (Innermost) // No HTTP, No DB, No Frameworks. public class PlaceOrderUseCase implements InputBoundary {
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public PlaceOrderUseCase(OrderRepository repo, Presenter presenter) { this.repo = repo; this.presenter = presenter; } // This is the "Use Case" layer (Innermost)
public void execute(RequestData request) { // 1. Validate business rules (Entities) Customer customer = repo.findCustomerById(request.customerId); Order order = new Order(customer, request.items); // 2. Calculate total Total total = order.calculateTotal(); // 3. Pass to presenter to show output ResponseModel response = new ResponseModel(order.getId(), total.value()); presenter.present(response); } } check your local technical library