Book Image

Domain-Driven Design with Golang

By : Matthew Boyle
4 (2)
Book Image

Domain-Driven Design with Golang

4 (2)
By: Matthew Boyle

Overview of this book

Domain-driven design (DDD) is one of the most sought-after skills in the industry. This book provides you with step-by-step explanations of essential concepts and practical examples that will see you introducing DDD in your Go projects in no time. Domain-Driven Design with Golang starts by helping you gain a basic understanding of DDD, and then covers all the important patterns, such as bounded context, ubiquitous language, and aggregates. The latter half of the book deals with the real-world implementation of DDD patterns and teaches you how to build two systems while applying DDD principles, which will be a valuable addition to your portfolio. Finally, you’ll find out how to build a microservice, along with learning how DDD-based microservices can be part of a greater distributed system. Although the focus of this book is Golang, by the end of this book you’ll be able to confidently use DDD patterns outside of Go and apply them to other languages and even distributed systems.
Table of Contents (13 chapters)
Part 1: Introduction to Domain-Driven Design
Part 2: Real -World Domain-Driven Design with Golang

The aggregate pattern

Aggregates are probably one of the hardest patterns of domain-driven design and are, therefore, often implemented incorrectly. This isn’t necessarily bad if it helps you organize your code, but in the worst case, it may hinder your development speed and cause inconsistencies.

In domain-driven design, the aggregate pattern refers to a group of domain objects that can be treated as one for some behaviors. Some examples of aggregate patterns are:

  • An order: Typically, an order consists of individual items, but it is helpful to treat them as a single thing (an order) for some purposes within our system.
  • A team: A team consists of many employees. In our system, we would likely have a domain object for employees, but grouping them and applying behaviors to them as a team would be helpful in situations such as organizing departments.
  • A wallet: Typically, a wallet (even a virtual one) contains many cards and potential currencies for many countries...