Get Your Hands Dirty on Clean Architecture: Build 'clean' applications with code examples in Java, 2nd Edition

Gain insight into how Hexagonal Architecture can help to increase maintainability.
Key Features

Explore ways to make your software flexible, extensible, and adaptable
Learn new concepts that you can easily blend with your own software development style
Develop the mindset of making conscious architecture decisions

Book Description

Building for maintainability is key to keep development costs low (and developers happy). The second edition of "Get Your Hands Dirty on Clean Architecture" is here to equip you with the essential skills and knowledge to build maintainable software.

Building upon the success of the first edition, this comprehensive guide explores the drawbacks of conventional layered architecture and highlights the advantages of domain-centric styles such as Robert C. Martin's Clean Architecture and Alistair Cockburn's Hexagonal Architecture. Then, the book dives into hands-on chapters that show you how to manifest a Hexagonal Architecture in actual code. You'll learn in detail about different mapping strategies between the layers of a Hexagonal Architecture and see how to assemble the architecture elements into an application. The later chapters demonstrate how to enforce architecture boundaries, what shortcuts produce what types of technical debt, and how, sometimes, it is a good idea to willingly take on those debts.

By the end of this second edition, you'll be armed with a deep understanding of the Hexagonal Architecture style and be ready to create maintainable web applications that save money and time. Whether you're a seasoned developer or a newcomer to the field, "Get Your Hands Dirty on Clean Architecture" will empower you to take your software architecture skills to new heights and build applications that stand the test of time.
What you will learn

Identify potential shortcomings of using a layered architecture
Apply varied methods to enforce architectural boundaries
Discover how potential shortcuts can affect the software architecture
Produce arguments for using different styles of architecture
Structure your code according to the architecture
Run various tests to check each element of the architecture

Who this book is for

This book is for you if you care about the architecture of the software you are building. To get the most out of this book, you must have some experience with web development. The code examples in this book are in Java. If you are not a Java programmer but can read object-oriented code in other languages, you will be fine. In the few places where Java or framework specifics are needed, they are thoroughly explained.
Table of Contents

Maintainability
What's Wrong with Layers?
Inverting Dependencies
Organizing Code
Implementing a Use Case
Implementing a Web Adapter
Implementing a Persistence Adapter
Testing Architecture Elements
Mapping between Boundaries
Assembling the Application
Taking Shortcuts Consciously
Enforcing Architecture Boundaries
Managing Multiple Bounded Contexts
A Component-Based Approach to Software Architecture
Deciding on an Architecture Style