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