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?

If you have built layered architectures in the past, you can probably relate to some of the disadvantages discussed in this chapter, and you could maybe even add some more.

If done correctly, and if some additional rules are imposed on it, a layered architecture can be very maintainable, and changing or adding to the codebase can be quite easy.

# How does this help me build maintainable software?

If you have built layered architectures in the past, you can probably relate to some of the disadvantages discussed in this chapter, and you could maybe even add some more.

If done correctly, and if some additional rules are imposed on it, a layered architecture can be very maintainable, and changing or adding to the codebase can be quite easy.

Let's recap the drawbacks of using layers in software architecture.

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: What's Wrong with Layers?

How does this help me build maintainable software?