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)
1
Section 1: Architecture Fundamentals
7
Section 2: Using Hexagons to Create a Solid Foundation
12
Section 3: Becoming Cloud-Native

Summary

In this chapter, we revisited the fundamentals of JVM, assessing some of its features related to JIT compilation and AOT compilation. We learned that JIT improves runtime performance, whereas AOT helps boost application startup time, which proves to be an essential feature for frameworks targeting cloud environments, as in this case with Quarkus.

After getting acquainted with some JVM concepts, we moved forward to learn about Quarkus and some important features it offers. Finally, we integrated Quarkus into our already developed hexagonal system topology and inventory. In order to accomplish such an integration, we created a new bootstrap module to act as a bridge between the hexagonal system modules and the development framework. We now know what it takes to integrate Quarkus into a modularized hexagonal application.

In the next chapter, we dive deeper into the integration between Quarkus and hexagonal architecture. We will learn how to refactor use cases and ports from...