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Designing Hexagonal Architecture with Java

Designing Hexagonal Architecture with Java

By : Davi Vieira
3.9 (10)
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Designing Hexagonal Architecture with Java

Designing Hexagonal Architecture with Java

3.9 (10)
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)
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1
Section 1: Architecture Fundamentals
7
Section 2: Using Hexagons to Create a Solid Foundation
12
Section 3: Becoming Cloud-Native

Chapter 12: Using RESTEasy Reactive to Implement Input Adapters

An input adapter is like a front door that exposes all the features provided by a hexagonal system. Whenever a user or other application wants to communicate with a hexagonal system, they reach one of the available input adapters. With such adapters, we can provide different ways to access the same functionality within the hexagonal system. If a client does not support HTTP communication, we can implement an adapter using a different protocol. The significant advantage here is that removing or adding new adapters does not influence the domain logic.

Due to the hexagonal architecture's decoupling and well-encapsulating nature, we can change technologies without major changes, or indeed any changes, occurring in the system domain logic.

In this chapter, we'll continue our journey in exploring the exciting features of Quarkus. One feature that fits quite well with implementing input adapters is the RESTEasy...

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