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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

Revisiting the JVM

The Virtual Machine (VM) concept wasn't something new when Java arrived back in 1995. Before that time, many other languages used VMs, though they weren't so popular among developers. Java architects decided to use VMs because they wanted a mechanism to create platform independence to improve developer productivity.

Before elaborating on the VM concept, let's first check what we can run inside a VM for Java. In languages such as C or C++, we compile source code into a native code tailored for a specific operating system and CPU architecture. When programming in Java, we compile the source code into bytecode. The JVM understands the instructions contained in bytecode.

The VM idea comes from a concept where it is possible to run programs in an intermediate or virtual environment sitting atop the real machine. In such an arrangement, the program does not need to communicate directly with the underlying operating system—the program deals only...

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