A good software architecture should keep the cost of development low over the complete lifetime of an application.

Ever wondered about how to actually implement a “Clean Architecture” or a “Hexagonal Architecture”? There’s a lot of noise around these keywords, but you can find very little hands-on material on this topic.

This book fills a void by providing a hands-on approach to the Hexagonal architecture style from the concepts behind it down to actual code.

Get Your Hands Dirty on Clean Architecture
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Get Your Hands Dirty on Clean Architecture
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All About Hexagonal Architecture

  • learn the concepts behind "Clean Architecture" and "Hexagonal Architecture"
  • explore a hands-on approach of implementing a Hexagonal architecture with example code on GitHub
  • develop your domain code independent of database or web concerns
Hexagonal Architecture

Get a Grip on Your Layers

  • learn about potential problems of the common layered architecture style
  • free your domain layer of oppressive dependencies using dependency inversion
  • structure your code in an architecturally expressive way
  • use different methods to enforce architectural boundaries
  • learn the consequences of shortcuts and when to accept them
  • ... and more

What Readers Say

"Tom Hombergs has done a terrific job in explaining clean architecture - from concepts to code. Really wish more technical books would be as clear as that one!"
Gernot Starke - Fellow at INNOQ, Author of Software Architecture Books, Coach, and Consultant
"Love your book. One of the most practical books on hexagonal architecture I have seen/read so far."
Marten Deinum - Spring Framework Contributor and Author of "Spring 5 Recipes" and "Spring Boot 2 Recipes"
"A book taken right out of the machine room of software development. Tom talks straight from his experience and guides you through the day-to-day trade-offs necessary to deliver clean architecture."
Sebastian Kempken - Software Architect at Adcubum
"Thank you for the great book, it helped me gain significant insight into how one would go about implementing hexagonal and DDD in a modern Spring project."
Spyros Vallianos - Java Developer at Konnekt-able
"After reading it I had one of these 'aha' moments when things finally click in your brain."
Manos Tzagkarakis - Java Developer at Datawise

Table of Contents

  1. What's Wrong with Layers?
  2. Inverting Dependencies
  3. Organizing Code
  4. Implementing a Use Case
  5. Implementing a Web Adapter
  6. Implementing a Persistence Adapter
  7. Testing Architecture Elements
  8. Mapping Between Boundaries
  9. Assembling the Application
  10. Enforcing Architecture Boundaries
  11. Taking Shortcuts Consciously
  12. Deciding on an Architecture Style

Questions? Comments?

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