Designing Hexagonal Architecture with Java by Davi Vieira

Author:Davi Vieira
Language: eng
Format: epub
Publisher: Packt Publishing Limited
Published: 2023-09-27T00:00:00+00:00

In this chapter, on top of the Domain hexagon, we built the Application hexagon with use cases and ports. For use cases, we heavily relied on a behavior-driven development tool called Cucumber. With Cucumber, we can express use cases supported by the system not only in code terms but also in written text.

We started by creating Cucumber feature files containing the use case written descriptions, and then we used them as a reference to create use case interfaces. These interfaces were then implemented by input ports that provided a concrete way to achieve the use case goals. Finally, we built use case tests, based again on the written description provided by Cucumber.

By implementing and testing the Application hexagon in this way, we leveraged the special capabilities of Cucumber to express the system’s behavior in a declarative and straightforward form, and we used these same capabilities to implement and test the entire Application hexagon.

On top of the Application hexagon and the features it provides, we need to decide how such features will be exposed. Also, some of these require access to external data sources. We’ll address all these concerns by developing the Framework hexagon in the next chapter.

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