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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

Summary

We started the Framework hexagon construction by implementing first the output adapters to enable the topology and inventory system to use as its primary data source an H2 in-memory database.

Then, we created three input adapters: one for router operations, another one for switch operations, and the last one for network-related operations. To conclude, we implemented tests to ensure that the adapters and the whole hexagonal system work as expected. By completing the development of the Framework hexagon, we finished the development of our overall hexagonal system.

We can improve the hexagonal system we have created by exploring the possibilities offered by the Java Platform Module System (JPMS). For example, we can leverage the hexagonal modular structure to apply the Dependency Inversion Principle (DIP). By doing so, we can make the hexagonal system more loosely coupled. We shall examine the DIP and other exciting features in the next chapter.

Questions

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Designing Hexagonal Architecture with Java
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