Discover Hexagonal Architecture to create web applications with isolated, testable layers. Gain insights into designing clean, maintainable modules and advocating for suitable techniques for your application.

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This course will teach you all about creating a web application in the Hexagonal Architecture style. Hexagonal Architecture promotes the separation of concerns by encapsulating logic in different layers of the application. This enables a higher level of isolation, testability, and control over your business specific code. 

You will learn how to design software modules and complete applications in a clean and maintainable manner, while also learning how to advocate for a certain technique given your application and constraints.

By the end of this course, you will have a greater understanding of how to implement software architecture, a key skill for any senior developer.

Hexagonal Software Architecture for Web Applications

# How does this help me build maintainable software?

Software architecture is basically all about managing dependencies between architecture elements. If the dependencies become a big ball of mud, the architecture becomes a big ball of mud.

So, to preserve the architecture over time, we need to continually make sure that dependencies point in the right direction.

When producing new code or refactoring existing code, we should keep the package structure in mind and use package-private visibility when possible to avoid dependencies to classes that should not be accessed from outside the package.

If we need to enforce architecture boundaries within a single build module, and the package-private modifier doesn't work because the package structure won't allow it, we can make use of post-compile
tools like ArchUnit.

And anytime we feel that the architecture is stable enough, we should extract architecture elements into their own build modules because this gives us explicit control over the dependencies.


This lesson recaps the importance of enforcing architecture boundaries and how it can help write maintainable software.

Before We Begin

What's Wrong with Layers?

Inverting Dependencies

Organizing Code

Implementing a Use Case

Implementing a Web Adapter

Implementing a Persistence Adapter

Testing Architecture Elements

Mapping Between Boundaries

Assembling the Application

Enforcing Architecture Boundaries

Taking Shortcuts Consciously

Assessment

Conclusion

Appendix

Conclusion: Enforcing Architecture Boundaries

How does this help me build maintainable software?