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System Overview
This codebase implements an order management service for an e-commerce platform. It handles the complete order lifecycle — from creation and payment processing through to fulfilment and cancellation — and is a critical path for all revenue-generating operations. Business stakeholders interact with this code on every transaction.
Health Score
Architecture
Clean DDD layers, clear separation of concerns
Maintainability
Well-named, low coupling, easy to extend
Test Readiness
Repository abstraction present but interface missing
Key Findings
OrderService depends on the concrete OrderRepository class rather than an abstract interface or Protocol. Swapping implementations (e.g. in-memory for tests) requires modifying the service itself.
Fix: Define AbstractOrderRepository as a Python Protocol with findById and save methods. OrderService should depend on the abstraction.
processPayment() lives on OrderService rather than on a dedicated PaymentService. As payment logic grows (retries, webhooks, refunds), the service will become a God Class.
Fix: Extract a PaymentService that owns the payment lifecycle. OrderService coordinates but does not process payments.
OrderStatus is a plain enumeration with no guard logic. Invalid transitions (e.g. SHIPPED → PENDING) are not prevented at the domain level — callers must remember to check.
Fix: Move valid-transition logic onto Order itself: def cancel(self): if self.status not in {PENDING, CONFIRMED}: raise InvalidTransition(...).
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