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


Over a period of time, there will be a need to realign context boundaries, domain events, APIs, and so on. There tends to be a stigma associated with things not working perfectly the first time and justifying the need for refactoring at the inter-component scale. However, this may be required for multiple reasons outside our control, ranging from competitor ecosystem changes, evolving/misunderstood requirements, inability to meet non-functional requirements, organizational and team responsibility changes, and so on. Hence, refactoring is a core discipline that software teams will need to embrace as a first-class practice.


We are covering only the strategic (inter-component) aspects of refactoring in this chapter. There are several great works on the tactical (intra-component) aspects of refactoring, such as Martin Fowler’s Refactoring ( book and Michael Feathers’ Working Effectively with Legacy Code, among others.