Designing Hexagonal Architecture with Java and Quarkus by Davi Vieira

Author:Davi Vieira [Vieira, Davi]
Language: eng
Format: epub
Tags: Quarkus Java, Decoupling, Software development, Java 16, Quarkus, Kubernets, Cloud-Native Application, Technical Debt, Clean Architecture
Publisher: Packt Publishing
Published: 2022-01-07T00:00:00+00:00

Summary

In this chapter, we had the opportunity to dive deep into the nature of driving and driven operations. Although, we had already dealt with them in previous chapters, here we examined these operations in more depth.

Starting with driving operations, we learned that they drive the hexagonal application behavior by calling its input adapters. To exemplify driving operations, we first created a front-end application to play the role of a primary actor requesting data through the input adapters provided by the topology and inventory hexagonal application. Then, to explore testing tools as driving operations, we created a Postman collection with tests based on API endpoints exposed by the hexagonal application.

On the driven operations side, we saw how to enable the hexagonal application to work with message-based systems like Kafka. To better understand the implications of message-based systems on the hexagonal application, we created ports and adapters that enabled the application to send and consume messages from Kafka. Also, we made a WebSocket server to let the front-end application retrieve the events generated by the hexagonal system in real-time.

By handling different kinds of driving and driven operations, we can now better comprehend the internals of a hexagonal system, its surroundings, and how they influence the hexagonal application.

The fundamentals acquired from this chapter and the previous ones provide all the building blocks to start developing robust change-tolerant systems with hexagonal architecture instruments.

In the next chapter, we'll apply the things we learned to initiate the construction of a production-grade hexagonal system that will incorporate features from the Java module system and Quarkus framework.

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