Book Image

Domain-Driven Design with Java - A Practitioner's Guide

By : Premanand Chandrasekaran, Karthik Krishnan
Book Image

Domain-Driven Design with Java - A Practitioner's Guide

By: Premanand Chandrasekaran, Karthik Krishnan

Overview of this book

Domain-Driven Design (DDD) makes available a set of techniques and patterns that enable domain experts, architects, and developers to work together to decompose complex business problems into a set of well-factored, collaborating, and loosely coupled subsystems. This practical guide will help you as a developer and architect to put your knowledge to work in order to create elegant software designs that are enjoyable to work with and easy to reason about. You'll begin with an introduction to the concepts of domain-driven design and discover various ways to apply them in real-world scenarios. You'll also appreciate how DDD is extremely relevant when creating cloud native solutions that employ modern techniques such as event-driven microservices and fine-grained architectures. As you advance through the chapters, you'll get acquainted with core DDD’s strategic design concepts such as the ubiquitous language, context maps, bounded contexts, and tactical design elements like aggregates and domain models and events. You'll understand how to apply modern, lightweight modeling techniques such as business value canvas, Wardley mapping, domain storytelling, and event storming, while also learning how to test-drive the system to create solutions that exhibit high degrees of internal quality. By the end of this software design book, you'll be able to architect, design, and implement robust, resilient, and performant distributed software solutions.
Table of Contents (17 chapters)
Part 1: Foundations
Part 2: Real-World DDD
Part 3: Evolution Patterns

Chapter 4: Domain Analysis and Modeling

“He who asks a question remains a fool for 5 minutes. He who does not ask remains a fool forever.”

– Chinese proverb

As we saw in the previous chapter, misinterpreted requirements can cause a significant portion of software projects to fail. Arriving at a shared understanding and creating a useful domain model requires high degrees of collaboration between domain experts. In this chapter, we will introduce the sample application we will use throughout the book and explore modeling techniques, such as domain storytelling and EventStorming, to enhance our collective understanding of a problem in a reliable and structured manner.

The following topics will be covered in this chapter:

  • Introducing the example application (a letter of credit)
  • Enhancing shared understanding
  • Domain storytelling
  • EventStorming

This chapter will help developers and architects learn how to apply these techniques in...