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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

Dealing with multiple adapter categories

In the context of the hexagonal architecture, adapters help us to increase the hexagonal system's compatibility with different protocols and technology. In the Framework hexagon, we finally decide how the system will expose its features through input adapters and how it will communicate with external systems through output adapters.

In a similar way to what happens in the Application and Domain hexagons, the Framework hexagon is encapsulated in its own Java module. This module approach helps us enforce the boundaries between each system hexagon. From the Framework hexagon's perspective, it's good to group all input and output adapters within the same module. Although modularization can help us delimit boundaries, it is not enough to prevent the maintainability challenges we may face when dealing with multiple adapter categories.

What I mean by adapter category is a classification to group adapters that enable the integration...

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