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Designing Hexagonal Architecture with Java

You're reading from   Designing Hexagonal Architecture with Java An architect's guide to building maintainable and change-tolerant applications with Java and Quarkus

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Product type Paperback
Published in Jan 2022
Publisher Packt
ISBN-13 9781801816489
Length 460 pages
Edition 1st Edition
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Author (1):
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Davi Vieira Davi Vieira
Author Profile Icon Davi Vieira
Davi Vieira
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Table of Contents (21) Chapters Close

Preface 1. Section 1: Architecture Fundamentals
2. Chapter 1: Why Hexagonal Architecture? FREE CHAPTER 3. Chapter 2: Wrapping Business Rules inside Domain Hexagon 4. Chapter 3: Handling Behavior with Ports and Use Cases 5. Chapter 4: Creating Adapters to Interact with the Outside World 6. Chapter 5: Exploring the Nature of Driving and Driven Operations 7. Section 2: Using Hexagons to Create a Solid Foundation
8. Chapter 6: Building the Domain Hexagon 9. Chapter 7: Building the Application Hexagon 10. Chapter 8: Building the Framework Hexagon 11. Chapter 9: Applying Dependency Inversion with Java Modules 12. Section 3: Becoming Cloud-Native
13. Chapter 10: Adding Quarkus to a Modularized Hexagonal Application 14. Chapter 11: Leveraging CDI Beans to Manage Ports and Use Cases 15. Chapter 12: Using RESTEasy Reactive to Implement Input Adapters 16. Chapter 13: Persisting Data with Output Adapters and Hibernate Reactive 17. Chapter 14: Setting Up Dockerfile and Kubernetes Objects for Cloud Deployment 18. Chapter 15: Good Design Practices for Your Hexagonal Application 19. Assessments 20. Other Books You May Enjoy

Enabling reactive behavior on output adapters

One of the most important benefits of using hexagonal architecture is the improved flexibility to change technologies without significant refactoring. The hexagonal system is designed in such a way that its domain logic and business rules are oblivious about the technologies utilized to execute them.

There is no free lunch – when we decide to use the hexagonal architecture, we have to pay the price for the benefits that such architecture can provide. (By price, I mean a considerable increase in the effort and complexity required to structure the system code by following the hexagonal principles.)

If you're concerned about code reuse, you may find some practices awkward to decouple code from specific technologies. For example, consider a scenario where we have a domain entity class and a database entity class. One can argue by saying, why not have just one class that serves both purposes? Well, in the end, it's all...

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