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

# Passing multiple parameters to a constructor with `build()`

`SendMoneyCommand`, our input model above, puts a lot of responsibility on its constructor. Since the class is immutable, the constructor's argument list contains a parameter for each attribute of the class. And since the constructor also validates the parameters, it's not possible to create an object with an invalid state. 

In our case, the constructor has only three parameters. What if we have more parameters? Couldn't we use the Builder pattern to make it more convenient to use? We could make the constructor with the long parameter list private and hide the call to it in the `build()` method of our builder. Then, instead of having to call a constructor with 20 parameters, we could build an object like this:

Learn how constructs can be a powerful tool that can help us write clean and maintainable software.


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

The Power of Constructors

Passing multiple parameters to a constructor with `build()`

Assessment

The Power of Constructors

Passing multiple parameters to a constructor with build()

Passing multiple parameters to a constructor with `build()`