Get Your Hands Dirty on Clean Architecture by Tom Hombergs.png

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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

We have talked a lot about architecture in the previous chapters and it feels good to have a target architecture to guide us in our decisions on how to craft code and where to put it.

In every above-playsize software project, however, architecture tends to erode over time. Boundaries between layers weaken, code becomes harder to test, and we generally need more and more time to implement new features.

In this chapter, we’ll discuss some measures that we can take to enforce the boundaries within our architecture and consequently fight architecture erosion.

# Introduction

We have talked a lot about architecture in the previous chapters and it feels good to have a target architecture to guide us in our decisions on how to craft code and where to put it.

In every above-playsize software project, however, architecture tends to erode over time. Boundaries between layers weaken, code becomes harder to test, and we generally need more and more time to implement new features.

In this chapter, we’ll discuss some measures that we can take to enforce the boundaries within our architecture and consequently fight architecture erosion.

Learn where boundaries lie within our architecture and what "enforcing a boundary" actually means.

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

Boundaries and Dependencies

Introduction