clean-architecture

Separating business logic from frameworks is achieved by applying Clean Architecture boundaries. You extract business rules into inner circles and wrap infrastructure as plugins, treating databases and frameworks as details to reduce coupling and enable easy swaps.

The dependency rule in Clean Architecture mandates that dependencies must point inward toward the core entities. Inner circles define interfaces and outer adapters implement them, ensuring that outer-layer changes to delivery mechanisms or databases never alter or break core business rules.

Structuring input and output boundaries involves defining Input/Output ports, Controllers, Presenters, and Gateways. This boundary anatomy isolates delivery mechanisms and enables plug-and-play adapters, allowing you to swap infrastructure without modifying the core use cases.

Concrete implementations are wired at the Main composition root. Functioning as a plugin layer, the Main composition root connects concrete adapters and infrastructure to the inner circles without altering the core business rules or use cases.

Yes, you can apply Clean Architecture boundaries to an existing module incrementally. You do this by extracting business rules into inner circles and wrapping existing infrastructure as plugins, enabling framework isolation and testable systems without a full rewrite.

You should avoid Clean Architecture when the overhead of strict boundaries, Interactor patterns, and multiple port interfaces outweighs the need for swap-friendly architecture. For small prototypes or modules where framework swaps are unlikely, this strict separation may introduce unnecessary complexity.