Implementing DDD, CQRS and Event Sourcing (The Book + Code)
Implementing DDD, CQRS and Event Sourcing
About the Book
This book explains and illustrates how to implement Domain-Driven Design, Command Query Responsibility Segregation and Event Sourcing. The goal is to build software that is behavior-rich, event-based, problem-centric, reactive, scalable and well-designed. Domain-Driven Design is a concept that focuses on the problem space and its associated knowledge areas. Command Query Responsibility Segregation separates a software into a write side and a read side. Event Sourcing is an architectural pattern that represents state as a sequence of immutable events. The concepts are explained in theory and put into practice with standalone examples and a Sample Application. This is done without third-party software. The book comes with a source code bundle and supports interactive execution. All code is written in JavaScript and uses Node.js as runtime.
Style of this book
The primary focus of this book is the application and the implementation of concepts. Therefore, the purely theoretical parts are generally concise. The covered topics are illustrated extensively with a large amount of examples and code. Nevertheless, selected conceptual parts are discussed in greater detail. Apart from Node.js and JavaScript, this book does not utilize or explain specific frameworks or technologies. For all functionalities that require persistence or inter-process communication, it provides exemplary implementations that directly work with the filesystem. This includes Repositories, the Event Store, Read Model storages and a remote event distribution. The goal is to convey a deeper understanding of the concepts that are related to persistence and messaging. For production purposes, these implementations can be easily replaced with suitable technologies.
The following articles explain selected aspects of the book style in more detail:
Packages
The Book + Code
Includes:
Code bundle (Release 1.1.0)
English
PDF
EPUB
MOBI
WEB
Company Edition - 10 copies (50% discount)
Includes:
Code bundle (Release 1.1.0)
English
PDF
EPUB
MOBI
WEB
Table of Contents
-
Preface
- Version & Feedback
- Style of this book
- Executing the code
- About the author
- Formatting and highlighting
- Chapter summary
-
Chapter 1: Domains
- Technological and business domains
- Domain Experts
- Subdomains
- Identification of Subdomains
- Sample Application: Domains
-
Chapter 2: Domain Models
- Structure and components
- Ubiquitous Language
- Domain Modeling
- Model representations
- Sample Application: Domain Models
-
Chapter 3: Bounded Contexts
- Relation to Domains
- Model and context sizes
- Contexts and language
- Technological boundaries
- Context Maps
- Sample Application: Bounded Contexts
-
Chapter 4: Software Architecture
- Common software parts
- Layered Architecture
- Onion Architecture
- Approach for this book
- Sample Application: Software architecture
-
Chapter 5: Code quality
- Model binding
- Readability
- Behavior and state
- Dealing with dependencies
- Command-Query-Separation
-
Chapter 6: Value Objects, Entities and Services
- Value Objects
- Entities
- Domain Services
- Invariants
- Sample Application: Domain Model implementation
-
Chapter 7: Domain Events
- Relation to Event-driven Architecture
- Naming conventions
- Structure and content
- Distribution and processing
- Sample Application: Event-based integration
-
Chapter 8: Aggregates
- Transactions
- Structure and access
- Concurrency
- Design considerations
- Eventual Consistency
- Sample Application: Aggregates
-
Chapter 9: Repositories
- Domain Model emphasis
- Design and implementation
- Optimistic Concurrency
- Interaction with Domain Events
- Sample Application: Repositories and event publishing
-
Chapter 10: Application Services
- Service design
- Use case scenarios
- Transactions and Processes
- Cross-cutting concerns
- Authentication and Authorization
- Sample Application: Application Services
-
Chapter 11: Command Query Responsibility Segregation
- Architectural overview
- Write and Read Model
- Read Model synchronization
- Commands and Queries
- Command and Query Handlers
- Sample Application: CQRS
-
Chapter 12: Event Sourcing
- Architectural overview
- Event-sourced Write Model
- Event Store
- Read Model Projection
- Domain Event publishing
- Sample Application: Event Sourcing
-
Chapter 13: Separate executable programs
- Program layouts
- Context-level communication
- Remote use case execution
- Remote event distribution
- Sample Application: Separate executable programs
-
Chapter 14: User Interface
- HTTP file server
- Task-based UI
- Optimistic UI
- Reactive Read Models
- Components and composition
- Sample Application: User Interface
-
Conclusion
- Apply what makes sense
- Going into production
- Exemplary technology stack
- Bibliography
Authors have earned$9,883,643writing, 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
C++ Best Practices
Jason TurnerLevel up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
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.
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.
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.
I am a Software Engineer and I am in Charge
Alexis Monville and Michael DoyleI am a Software Engineer and I am in Charge is a real-world, practical book that helps you increase your impact and satisfaction at work no matter who you work with.
In the book, we will follow Sandrine, a fictional character who learns to think in a new way enabling her to take a different course of action.
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!
Invest In Digital Health - The Medical Futurist's Guide
Dr. Bertalan MeskoArtificial Intelligence and Digital Health are booming. In this book, we explain why now it's a good time to invest in Digital Health and give recommendations on where to invest by looking at the top 24 technological trends we find the most promising.
The Hundred-Page Machine Learning Book
Andriy BurkovEverything you really need to know in Machine Learning in a hundred pages.
Mastering STM32
Carmine NovielloWith more than 600 microcontrollers, STM32 is probably the most complete ARM Cortex-M platform on the market. This book aims to be the first guide around that introduces the reader to this exciting MCU portfolio from ST Microelectronics and its official CubeHAL.
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... - #2
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #3
The Future of Digital Health
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 and how technology giants such as Amazon or Google want to conquer... - #4
Cisco CCNA 200-301 Complet
4 Books
Ce lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301. - #5
CCDE Practical Studies (All labs)
3 Books
CCDE lab - #6
"The C++ Standard Library" and "Concurrency with Modern C++"
2 Books
Get my books "The C++ Standard Library" and "Concurrency with Modern C++" in a bundle. The first book gives you the details you should know about the C++ standard library; the second one dives deeper into concurrency with modern C++. In sum, you get more than 600 pages full of modern C++ and about 250 source files presenting the standard library... - #7
Modern Management Made Easy
3 Books
Read all three Modern Management Made Easy books. Learn to manage yourself, lead and serve others, and lead the organization. - #8
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... - #9
Programming with Ease
3 Books
Alle drei Bände der Serie Programming with Ease in einem Paket. Darin findest du alles, was ich dir zu den wichtigsten Phasen der Softwareentwicklung im Hinblick auf Clean Code Development für langfristig hohe Produktivität sagen kann.Im Band Slicing findest du die Anforderungsanalyse im Rahmen eines iterativ-inkrementellen Vorgehensmodells aus... - #10
Vagrant Ansible
2 Books
Unveil the power of Ansible and Vagrant with this bundle at a special price. You'll have everything you need to get started with Vagrant - learn the basics and how to create your virtual development environments, using Ansible as provisioner! About Vagrant Cookbook Vagrant Cookbook is a complete guide to get started with Vagrant and create your...