clean-architecture

Clean architecture is a software design approach that separates concerns into distinct layers with strict dependency rules. It improves software maintainability and scalability by ensuring business logic remains isolated from external frameworks, making changes easier and less costly.

Structure your software project using a four-layered architecture where dependencies always point inward toward the core business logic. Apply cohesion and coupling principles to separate components, and use the Humble Object pattern to isolate testable behaviors from non-testable ones.

Use the Humble Object pattern in software design when you need to separate hard-to-test behaviors, such as UI or database interactions, from core logic. This pattern extracts the testable logic into a separate component, ensuring your architecture remains highly testable and maintainable.

Yes, applying these layering and dependency direction principles requires a solid understanding of software architecture and design concepts. The guidance focuses on advanced concepts like component cohesion, coupling, and the Humble Object pattern for scalable software design.

The best way to audit an existing codebase is to use specific workflows to evaluate layering and dependency directions against clean architecture principles. Check component coupling and cohesion to identify areas where business logic leaks into outer layers, then apply targeted cleanup workflows.

High coupling makes software changes costly because modifying one component directly impacts or breaks dependent components. By applying clean architecture principles to reduce coupling and increase cohesion, you isolate changes to specific layers, preventing widespread system failures and reducing maintenance costs.