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Designing Hexagonal Architecture with Java

Designing Hexagonal Architecture with Java

By : Davi Vieira
3.9 (10)
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Designing Hexagonal Architecture with Java

Designing Hexagonal Architecture with Java

3.9 (10)
By: Davi Vieira

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)
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1
Section 1: Architecture Fundamentals
7
Section 2: Using Hexagons to Create a Solid Foundation
12
Section 3: Becoming Cloud-Native

Testing Reactive input adapters

Our testing efforts started on the Domain hexagon by unit testing the core system components. Then, we moved on to the Application hexagon, where we could test the use cases using behavior driven design techniques. Now that we have implemented Reactive REST endpoints on the Framework hexagon, we need to find a way to test them.

Fortunately, Quarkus is well equipped when it comes to endpoint testing. To get started, we need the following dependency:

<dependencies>
  <dependency>
    <groupId>io.rest-assured</groupId>
    <artifactId>rest-assured</artifactId>
    <scope>test</scope>
  </dependency>
</dependencies>

The rest-assured dependency allows us to test HTTP endpoints. It provides an intuitive library that's very useful for making requests and extracting responses from HTTP calls.

To see how...

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