Recommended by giants like Netflix and Amazon, "Hexagonal" or the Ports & Adapters architecture simplifies testing, protects against business logic leakage, supports changing technologies, and lets you apply Domain Driven Design.

In this definitive book on the subject, renowned author Dr. Alistair Cockburn and Juan Manuel Garrido de Paz lay bare all of the intricacies of the pattern, providing sample code and answering your many frequently asked questions.

"We finally have an authoritative reference guide to the pattern. it is a very complete and detailed work. You can consider it a must-have reference both theoretically and practically." -- Fran Iglesias

"I just wanted to say thank you for hexagonal architecture. Making changes to the services we hexagonalized properly feels really good and easy. The same changes kept giving us headaches in other services." -- Michael Kutz

Oh, and check out the mug with the diagram, so you can answer your colleagues' questions as you read.

IMPORTANT NOTE: If you bought the Preview Edition, the updated pages are available without charge at Changed-pages-from-Preview