Implementing the Clean Architecture
Implementing the Clean Architecture
Python Edition
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.
About the Author
Table of Contents
-
Foreword
- 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 Implementation
- 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. CQRS
- 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. Modularity
- 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. Testing
- 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
- Projections
- Event Sourcing in the landscape of a modular application
- Bibliography
Authors have earned$10,244,335writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
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.
Learn more about Leanpub's ebook formats and where to read them
Top Books
- #1
500 QUIZ MMG COMMENTATI
ALS Medicina Generale500 Quiz degli ULTIMI Concorsi di Medicina Generale (2014/2016/2017/2018/2019)
Riassunti e suddivisi per area con Griglia risposte vuota e Griglia risposte esatte Ministeriale
Commentati con link alla fonte per approfondimento e ausilio allo studio
- #2
C++20
Rainer GrimmC++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
- #3
Functional Design and Architecture
Alexander GraninSoftware 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.
- #4
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
- #5
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
- #6
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #7
Algebra-Driven Design
Sandy MaguireA how-to field guide on building leak-free abstractions and algebraically designing real-world applications.
- #8
Thinking with Types
Sandy MaguireThis book aims to be the comprehensive manual for type-level programming. It's about getting you from here to there---from a competent Haskell programmer to one who convinces the compiler to do their work for them.
- #9
C++ Best Practices
Jason TurnerLevel up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
- #10
Stratospheric
Tom Hombergs, Björn Wilmsmann, and Philip RiecksFrom Zero to Production with Spring Boot and AWS. All you need to know to get a Spring Boot application into production with AWS. No previous AWS knowledge required.
Top Bundles
- #1
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #4
Cloud Architect: Transform Technology and Organization
2 Books
Architects don't just recite product names and features. They understand the options, decisions, and trade-offs behind them. They earn credibility and maintain authenticity by connecting the penthouse with the engine room. Get two essential books that redefine the role of the software and IT architect at one low price:37 Things One Architect... - #6
Linux Administration Complet
4 Books
Ce lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité... - #7
The Python Craftsman
3 Books
The Python Craftsman series comprises The Python Apprentice, The Python Journeyman, and The Python Master. The first book is primarily suitable for for programmers with some experience of programming in another language. If you don't have any experience with programming this book may be a bit daunting. You'll be learning not just a programming... - #10
All the Books of The Medical Futurist
6 Books
We put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy, digital health investments and how technology giants such as Amazon...
