Solve complex business problems by understanding users better, finding the right problem to solve, and building lean event-driven systems to give your customers what they really want

Key Features

• Apply DDD principles using modern tools such as EventStorming, Event Sourcing, and CQRS
• Learn how DDD applies directly to various architectural styles such as REST, reactive systems, and microservices
• Empower teams to work flexibly with improved services and decoupled interactions

Book DescriptionDevelopers across the world are rapidly adopting DDD principles to deliver powerful results when writing software that deals with complex business requirements. This book will guide you in involving business stakeholders when choosing the software you are planning to build for them. By figuring out the temporal nature of behavior-driven domain models, you will be able to build leaner, more agile, and modular systems.

You'll begin by uncovering domain complexity and learn how to capture the behavioral aspects of the domain language. You will then learn about EventStorming and advance to creating a new project in .NET Core 3.1; you'll also and write some code to transfer your events from sticky notes to C#. The book will show you how to use aggregates to handle commands and produce events. As you progress, you'll get to grips with Bounded Contexts, Context Map, Event Sourcing, and CQRS. After translating domain models into executable C# code, you learn some useful front-end related patterns with a sample application using Vue.js. In addition to this, you'll learn how to refactor your code and cover event versioning and migration essentials.

By the end of this DDD book, you will have gained the confidence to implement the DDD approach in your organization and be able to explore new techniques that complement what you've learned from the book.

What you will learn

• Discover and resolve domain complexity together with business stakeholders
• Avoid common pitfalls when creating the domain model
• Study the concept of Bounded Context and aggregate
• Design and build temporal models based on behavior and not only data
• Explore benefits and drawbacks of Event Sourcing
• Get acquainted with CQRS and to-the-point read models with projections
• Understand how a task-based UI conforms to DDD principles

Who this book is forThis book is for .NET developers who have an intermediate level understanding of C#, and for those who seek to deliver value, not just write code. Intermediate level of competence in JavaScript will be helpful to follow the UI examples. First chapters of the book are mostly language-agnostic and can benefit anyone who wants to learn more about DDD and event sourcing.

Table of Contents

1. Why Domain-Driven Design
2. Language and Context
3. EventStorming
4. Designing the Model
5. Implementing the Model
6. Acting with Commands
7. Consistency Boundary
8. Aggregate persistence
9. CQRS: The read-side
10. Event Sourcing
11. Projections
12. Bounded Context
13. Splitting the System

About the Author

Alexey Zimarev is a software architect with a present focus on domain models, Domain-Driven Design (DDD), event sourcing, message-driven systems and microservices, coaching, and mentoring. Alexey is also a contributor to several open source projects, such as RestSharp and MassTransit, and is the organizer of the DDD Norway meetup.