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 Designing Hexagonal Architecture with Java
 Designing Hexagonal Architecture with Java

Designing Hexagonal Architecture with Java: Build maintainable and long-lasting applications with Java and Quarkus , Second Edition

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Designing Hexagonal Architecture with Java

Why Hexagonal Architecture?

Software that’s not well organized and lacks sound software architecture principles may work just fine but develop technical debt over time. As new features are added, the software may become more complex to maintain because there is no common ground to guide code changes. Based on that problem, this chapter explains how hexagonal architecture helps to build software prepared to accommodate changes from unexpected requirements and, by doing so, allows us to increase software maintainability and keep technical debt under control.

We tackle the technical debt problem that arises when shortcuts are taken to overcome the difficulty of introducing changes caused by an inflexible software architecture. We will see how hexagonal architecture helps us improve maintainability by providing the principles to decouple the business logic (code that should purely represent a business problem) from the technology code (code that integrates the system with different technologies such as databases, messaging queues, and external APIs to support the business logic).

I have seen systems developed with business logic closely related to the technology code. Some of those systems would rarely change, so the coupling between business logic and technology code would never be a problem. However, significant refactorings would be necessary for other systems where the requirements would change often and substantially. That was because the business logic was so tightly coupled with the technology code that rewriting the business logic was the only plausible solution.

Using hexagonal architecture may help you to save time and effort due to the software rewrites caused by such scenarios where requirements change often and significantly.

In this chapter, we will cover the following topics:

  • Reviewing software architecture
  • Understanding hexagonal architecture

By the end of this chapter, you will have learned about the main concepts of hexagonal architecture: entities, use cases, ports, and adapters. Also, you’ll know the basic techniques to start applying hexagonal principles in your projects.

Technical requirements

To compile and run the code examples presented in this chapter, you need the latest Java SE Development Kit and Maven 3.8 installed on your computer. They are both available for Linux, macOS, and Windows operating systems.

You can find the code files for this chapter on GitHub at https://github.com/PacktPublishing/-Designing-Hexagonal-Architecture-with-Java---Second-Edition/tree/main/Chapter01.

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Key benefits

  • Use hexagonal architecture to increase maintainability and reduce technical debt
  • Learn how to build systems that are easy to change and understand
  • Leverage Quarkus to create modern cloud-native applications
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

We live in a fast-evolving world with new technologies emerging every day, where enterprises are constantly changing in an unending quest to be more profitable. So, the question arises — how to develop software capable of handling a high level of unpredictability. With this question in mind, this book explores how the hexagonal architecture can help build robust, change-tolerable, maintainable, and cloud-native applications that can meet the needs of enterprises seeking to increase their profits while dealing with uncertainties. This book starts by uncovering the secrets of the 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 with ports and use cases in the application hexagon, and make your software compatible with different technologies by employing adapters in the framework hexagon. In this new edition, you’ll learn about the differences between a hexagonal and layered architecture and how to apply SOLID principles while developing a hexagonal system based on a real-world scenario. Finally, you’ll get to grips with using Quarkus to turn your hexagonal application into a cloud-native system. By the end of this book, you’ll be able to develop robust, flexible, and maintainable systems that will stand the test of time.

Who is this book for?

This book is for software architects and Java developers looking to improve code maintainability and enhance productivity with an architecture that allows changes in technology without compromising business logic. Intermediate knowledge of the Java programming language and familiarity with Jakarta EE will help you to get the most out of this book.

What you will learn

  • Apply SOLID principles to the hexagonal architecture
  • Assemble business rules algorithms using the specified design pattern
  • Combine domain-driven design techniques with hexagonal principles to create powerful domain models
  • Employ adapters to enable system compatibility with various protocols such as REST, gRPC, and WebSocket
  • Create a module and package structure based on hexagonal principles
  • Use Java modules to enforce dependency inversion and ensure software component isolation
  • Implement Quarkus DI to manage the life cycle of input and output ports

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 29, 2023
Length: 438 pages
Edition : 2nd
Language : English
ISBN-13 : 9781837630714
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Product Details

Publication date : Sep 29, 2023
Length: 438 pages
Edition : 2nd
Language : English
ISBN-13 : 9781837630714
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Table of Contents

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

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(4 Ratings)
5 star 25%
4 star 50%
3 star 0%
2 star 25%
1 star 0%
arsalan Oct 04, 2023
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book takes you on a journey through the intricacies of hexagonal architecture. One of the book's standout features is its clear explanation of the hexagonal architecture's fundamental elements, such as entities, use cases, ports, and adapters. The author walks you through each component, demonstrating how to structure your code to achieve maximum maintainability and flexibility. The real-world scenario examples are a valuable addition, offering practical insights into applying SOLID principles within a hexagonal context.
Amazon Verified review Amazon
POE Oct 20, 2023
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This book covers the ports and adapters pattern, also referred to as hexagonal architecture, using Java and Quarkus. The book provides a clear and detailed introduction into this architecture. There are sufficient examples throughout the book to help us understand how to use hexagon applications and how to build the hexagon framework. There is a section that covers how to use Quarkus for a modernized approach. Overall, a great read!
Amazon Verified review Amazon
Tans Oct 04, 2023
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
It is a comprehensive and enlightening journey into the world of hexagonal architecture and Quarkus, tailored to Java developers and software architects. From the outset, it emphasizes the importance of building robust, resilient, and cloud-native applications capable of withstanding unpredictability – a vital requirement in the modern software industry. It is a must-read for software architects and Java developers seeking to enhance code maintainability and adaptability. It provides a solid foundation in hexagonal architecture, offers practical insights into its implementation, and shows how to harness the power of Quarkus for cloud-native applications.
Amazon Verified review Amazon
mgustav Dec 10, 2023
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Why, on earth, in this book input ports implement use cases, not the other way around?I highly recommend another book on this topic: "Get Your Hands Dirty on Clean Architecture, Java, 2nd Edition". That one is up to the point with many practical insights. Or just read some articles by the creator of Hexagonal Architecture.I got nothing from the superficial rendering of many subjects (DDD, Hexagonal, Quarkus) in this book.
Amazon Verified review Amazon
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