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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

Assuring consistency with aggregates

We've so far seen how valuable entities are to represent things in a problem domain. Also, we saw how value objects are essential to enhance the descriptiveness of the model we are modeling. But how to proceed when we have a group of related entities and value objects that express a whole concept when put together? For such a scenario, we should employ the use of aggregates. The idea is that objects inside an aggregate operate in a consistent and isolated manner. To achieve such consistency, we must ensure that any change on any aggregate object is conditioned to the variants imposed by such an aggregate.

Aggregates are like an orchestrator that orchestrates data and behavior on the objects it controls. For this approach to work, we need to define an entry point to interact with the aggregate realm. This entry point is also known as the aggregate root, which keeps references to the entities and value objects that are part of the aggregate...

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