HexagonalArchitecture

Hexagonal Architecture is an architecture defined by establishing a perimeter around the domain of your application and establishing adapters for input/output interactions. By establishing this isolation layer, the application becomes unaware of the nature of the things it's interacting with.

Create your application to work without either a UI or a database so you can run automated regression-tests against the application, work when the database becomes unavailable, and link applications together without any user involvement. - Alistair Cockburn

Benefits

• Application components can be released separately.

Further Reading

• HexagonalArchitecture - Alistair Cockburn
• the middle hexagon should be independent of the adapters