Implementing the Clean Architecture
Implementing the Clean Architecture
About the Book
Neither database nor framework should shape your application. Business needs should. Unfortunately, it might have got out of sight due to years spent on writing Django- or Rails-like web applications with Active Record ORMs.
The Clean Architecture is an approach that puts your customer’s concerns in the centre of software. All other issues, such as persistence are treated as implementation details. This is achieved thanks to a careful layering of the project.
As a result, business rules are decoupled from frameworks and 3rd party services. Therefore you can rapidly prototype and test core value. Everything has its place, which makes i.e. onboarding new team members a breeze. Last, but certainly not least – as time passes and project grows the Clean Architecture lets you maintain order and remain flexible.
- Why I wrote this book?
- Tools-driven era
- Who is this book for?
- What will you find in this book?
1. The Clean Architecture
- 1.1 What is it all for?
1.2 Code layers - horizontal slicing
- 1.2.1 External world
- 1.2.2 Infrastructure
- 1.2.3 Application
- 1.2.4 Domain
- 1.2.5 The Dependency Rule
- 1.2.6 Boundaries
- 1.3 Chapter summary
2. Referential implementation
- 2.1 Control flow in the Clean Architecture
- 2.2 Business requirements
- 2.3.1 Sequence diagram
- 2.3.2 Input Boundary
- 2.3.3 Output Boundary
- 2.3.4 Presenter
- 2.3.5 View model
- 2.3.6 Use Case
- 2.3.7 Data Access Interface
- 2.3.8 Data Access
- 2.3.9 Entities - Bid
- 2.3.10 Entities - Auction
- 2.4 Chapter summary
3. The Clean Architecture modifications
- 3.1 Presenter dillema
- 3.2 Getting rid of Input Boundary
3.3 Alternative design of Use Cases
- 3.3.1 Application Facade
- 3.3.2 Mediator (Command Bus)
- 3.4 Resigning from Entities in favour of ORM models
- 3.5 Chapter summary
4. Dependency Injection
- 4.1 Abstractions & classes everywhere!
- 4.2 Abstractions in the Clean Architecture
- 4.3 Inversion of Control
- 4.4 IoC Container versus Service Locator
- 4.5 Dependency Injection versus configuration
- 4.6 Chapter summary
- 5.1 Introduction
- 5.2 What does it have to do with the Clean Architecture?
- 5.3 Separate read stack - why?
5.4 Separate read stack - how?
- 5.4.1 Query as DTO
- 5.4.2 Query as separate classes
- 5.4.3 Read model facade
- 5.5 CQRS vs REST API
- 5.6 CQRS vs GraphQL
- 5.7 Chapter summary
6. Sharp boundary
- 6.1 A word on complexity
- 6.2 Two worlds
- 6.3 Boundary between Application and External World
- 6.4 Writing Input DTOs
- 6.5 Value Objects
- 6.6 Chapter summary
7. End-to-end example
- 7.1 Where to start?
- 7.2 Walking skeleton
- 7.3 Placing Bid Use Case / Interactor
- 7.4 Auction and Bid Entities
- 7.5 Data Access Intreface (Abstract Repository)
- 7.6 Data Access (Repository)
- 7.7 Finishing PlacingBid Use Case
- 7.8 Packaging code
- 7.9 Implementing EndingAuction Use Case
- 7.10 Read-only operations
- 7.11 Inverting control with Events
- 7.12 Dealing with other cross-cutting concerns
- 7.13 Chapter summary
- 8.1 The burden of success - growth & continuous changes
- 8.2 Cohesion and modules
- 8.3 Packaging code by feature
- 8.4 Modules and flexibility of interior design
- 8.5 Modules versus microservices
- 8.6 Modules versus user
- 8.7 Modules vs Bounded Contexts
- 8.8 Modules implementation
- 8.9 Modules depending on each other
- 8.10 Case study - auctioning platform
- 8.11 Chapter summary
- 9.1 Testing strategy and feature flavours
- 9.2 Rediscovering unit-testing
- 9.3 Unit-testing of an entire module
- 9.4 Chapter summary
- Final words
Appendix A: Migrating from legacy
- Should I even migrate?
- How to do it?
- I cannot stop delivering new features
Appendix B: Introduction to Event Sourcing
- What is Event Sourcing?
- Simple example of an Event Sourcing Aggregate
- Persistence in Event Sourcing
- Event Sourcing in the landscape of a modular application
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Ansible for KubernetesJeff Geerling
Ansible is a powerful infrastructure automation tool. Kubernetes is a powerful application deployment platform. Learn how to use these tools to automate massively-scalable, highly-available infrastructure.
Practical FP in Scala: A hands-on approachGabriel Volpe
A practical book aimed for those familiar with functional programming in Scala who are yet not confident about architecting an application from scratch.
Together, we will develop a purely functional application using the best libraries in the Cats ecosystem, while learning about design patterns and best practices.
Functional Design and ArchitectureAlexander Granin
Software Design in Functional Programming, Design Patterns and Practices, Methodologies and Application Architectures. How to build real software in Haskell with less efforts and low risks. The first complete source of knowledge.
Production HaskellMatt Parsons
Are you excited about Haskell, but don't know where to begin? Are you thrilled by the technical advantages, but worried about the unknown pitfalls? This book has you covered.
Tame your Work FlowSteve Tendon and Daniel Doiron
Do you need a high performance enterprise governance approach improving management, execution and delivery while dealing with multiple projects/products, events, stakeholders and teams? Giving you better bottom line results, faster time to market, less work, better predictability, happier employees, and delighted clients? Then learn about TameFlow!
Ansible for DevOpsJeff Geerling
Ansible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
Machine Learning EngineeringAndriy Burkov
"If you intend to use machine learning to solve business problems at scale, I'm delighted you got your hands on this book."
—Cassie Kozyrkov, Chief Decision Scientist at Google
"Foundational work about the reality of building machine learning models in production."
—Karolis Urbonas, Head of Machine Learning and Science at Amazon
C++ Best PracticesJason Turner
Level up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
Composing SoftwareEric Elliott
All software design is composition: the act of breaking complex problems down into smaller problems and composing those solutions. Most developers have a limited understanding of compositional techniques. It's time for that to change.
El Manual del ManagerKeyvan Akbary, Félix López, and Álvaro Salazar
¿Has deseado alguna vez el haber tenido una buena introducción al rol del Engineering Manager? En este libro aprenderás lo necesario para ejercer el rol de una manera efectiva: Expectativas y Responsabilidades del Rol, 1-1s, Ayudar a Crecer, Objetivos, Planes de Carrera, Cultura, Feedback, Contratación, Cultura de Producto y mucho más.
The Tester's Library
8 BooksThe Tester's Library consists of eight five-star books that every software tester should read and re-read. As bound books, this collection would cost over $200. Even as e-books, their price would exceed $80, but in this bundle, their cost is only $49.99. Here are the books, and why they should be in your library: Perfect Software and Other...
11 BooksIn this bundle, you will find 10 different agile books. They are about different aspects of being agile. - finding a job - doing coding dojo's - Retrospectives - Personal kanban - a non-typical coaching book and even a book that gives you an insight in the lives of some agile people.
WTFlop 6M + HU - Beta Bundle
Marionette.js A to Z
Build A Better Backbone App
3 BooksThe best way to learn new development skills is through experience, but that takes time you don't have.Get the best of both worlds with this bundle: you'll learn how to produce modern web applications by learning from experienced developers like Derick Bailey and David Sulc. BackboneJS is one of the favorite tools on the web today, but it...
General Systems Thinker Bundle
5 BooksThe General Systems Thinker Bundle is just that: a bundle of five books to advance the reader one giant step toward improved thinking, based on General Systems principles. Four of the books are the complete General Systems Series. The fifth is fictional piece which shows some general systems thinkers in action. It's a mystery in which a group of...
Experiential Learning Bundle
4 BooksThis bundle provides all four volumes of the popular Experiential Learning Series at a savings of $20 over the price if purchased separately.
2 BooksAfter getting up and running with Ansible in Jeff Geerling's Ansible for DevOps, strengthen your skills managing tens to thousands of instances and services in Amazon's AWS cloud with Yan Kurniawan's Ansible for AWS.
Learn ECMAScript 6 inside and out
2 BooksFor any technology, it helps to get multiple points of view on the functionality to get the best possible understanding. For ECMAScript 6/2015, no two resources are recommended more frequently thanExploring ES6by Dr. Axel Rauschmayer andUnderstanding ECMAScript 6by Nicholas C. Zakas. These two points of view, investigating the specification and...
Software architecture, for systems old and new
2 BooksThis bundle includes books about hands-on software architecture.