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

# Introduction

Most applications today have some kind of web interface --- either a #key# UI: User Interface #key# that we can interact with via web browser or an #key# HTTP: Hypertext Transfer Protocol #key# #key# API: Application Programming Interface  #key# that other systems can call to interact with our application. 

In our target architecture, all communication with the outside world goes through adapters. Let's discuss how we can implement an adapter that provides such a web interface. 

The figure below gives a detailed view of the architecture elements that are relevant to our discussion of a web adapter --- the adapter itself and the ports through which it interacts with our application core.

# Web adapter with ports

Learn how to implement dependency inversion with a web adapter.

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

Dependency Inversion with a Web Adapter

Introduction