Book Image

Designing Hexagonal Architecture with Java

By : Davi Vieira
Book Image

Designing Hexagonal Architecture with Java

By: Davi Vieira

Overview of this book

Hexagonal architecture enhances developers' productivity by decoupling business code from technology code, making the software more change-tolerant, and allowing it to evolve and incorporate new technologies without the need for significant refactoring. By adhering to hexagonal principles, you can structure your software in a way that reduces the effort required to understand and maintain the code. This book starts with an in-depth analysis of hexagonal architecture's building blocks, such as entities, use cases, ports, and adapters. You'll learn how to assemble business code in the Domain hexagon, create features by using ports and use cases in the Application hexagon, and make your software compatible with different technologies by employing adapters in the Framework hexagon. Moving on, you'll get your hands dirty developing a system based on a real-world scenario applying all the hexagonal architecture's building blocks. By creating a hexagonal system, you'll also understand how you can use Java modules to reinforce dependency inversion and ensure the isolation of each hexagon in the architecture. Finally, you'll get to grips with using Quarkus to turn your hexagonal application into a cloud-native system. By the end of this hexagonal architecture book, you'll be able to bring order and sanity to the development of complex and long-lasting applications.
Table of Contents (21 chapters)
Section 1: Architecture Fundamentals
Section 2: Using Hexagons to Create a Solid Foundation
Section 3: Becoming Cloud-Native

Section 1: Architecture Fundamentals

In this section, you will gain a solid understanding of hexagonal architecture elements: domain entities, use cases, ports, and adapters. Starting with a discussion about why we would apply hexagonal architecture principles to our project, we progressively advance our exploration by learning how to organize problem domain code with Domain Driven Design techniques.

Then, we examine the important role use cases and ports play in expressing system behaviors. Moving ahead, we explore how adapters allow the hexagonal system to be compatible with different protocols and technologies. Finally, we close the section by discussing how driving and driven operations influence the behaviors of a hexagonal system.

This section comprises the following chapters:

  • Chapter 1, Why Hexagonal Architecture?
  • Chapter 2, Wrapping Business Rules inside Domain Hexagon
  • Chapter 3, Handling Behavior with Ports and Use Cases
  • Chapter 4, Creating Adapters...