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

# The web adapter

What does a web adapter actually do? Let's say we want to provide a #key# REST: Representational State Transfer #key# #key# API: Application Programming Interface  #key# for our BuckPal application. Where do the responsibilities of the web adapter start and where do they end?

A web adapter usually does these things:



1. Maps #key# HTTP: Hypertext Transfer Protocol #key# request to Java objects
2. Performs authorization checks
3. Validates input
4. Maps input to the input model of the use case
5. Calls the use case
6. Maps output of the use case back to #key# HTTP: Hypertext Transfer Protocol #key#
7. Returns #key# HTTP: Hypertext Transfer Protocol #key#  response 

Learn about web adapter's responsibilities.


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

Responsibilities of a Web Adapter

The web adapter