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.

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

Let's try to address some of the issues of the "organize by layer" approach.

# Project structure

The next approach is to organize our code by feature:

```text
buckpal
└── account
    ├── Account
    ├── AccountController
    ├── AccountRepository
    ├── AccountRepositoryImpl
    └── SendMoneyService
```

# Explanation


In essence, we have put all the code related to accounts into the high-level package `account`. We have also removed the layer packages.

Each new group of features will get a new high-level package next to `account`. We can enforce package boundaries between the features by using package-private visibility for the classes that should not be accessed from the outside.

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

Organizing by Feature

Project structure

Explanation