Hexagonal Architecture

Also known as

• Ports and Adapters
• Clean Architecture
• Onion Architecture

Intent

Allow an application to equally be driven by users, programs, automated test or batch scripts, and to be developed and tested in isolation from its eventual run-time devices and databases.

Class diagram

Applicability

Use Hexagonal Architecture pattern when

• When the application needs to be independent of any frameworks
• When it is important that the application highly maintainable and fully testable

Tutorials

• Build Maintainable Systems With Hexagonal Architecture

Real world examples

• Apache Isis builds generic UI and REST API directly from the underlying domain objects

Credits

• Alistair Cockburn - Hexagonal Architecture