Book Image

Get Your Hands Dirty on Clean Architecture

By : Tom Hombergs
Book Image

Get Your Hands Dirty on Clean Architecture

By: Tom Hombergs

Overview of this book

Building for maintainability is key to keeping development costs low and processes easy. The second edition of Get Your Hands Dirty on Clean Architecture is here to equip you with the essential skills and knowledge to build maintainable software. With this comprehensive guide, you’ll explore the drawbacks of conventional layered architecture and the advantages of domain-centric styles such as Robert C. Martin's Clean Architecture and Alistair Cockburn's Hexagonal Architecture. Then, you’ll dive into hands-on explanations on how to convert hexagonal architecture into actual code. You'll learn in detail about different mapping strategies between the layers of hexagonal architecture and discover how to assemble the architectural elements into an application. Additionally, you’ll understand how to enforce architecture boundaries, which shortcuts produce what types of technical debt, and how, sometimes, it is a good idea to willingly take on those debts. By the end of this second edition, you'll be armed with a deep understanding of the hexagonal architecture style and be ready to create maintainable web applications that save money and time.
Table of Contents (13 chapters)

Why Shortcuts Are Like Broken Windows

In 1969, psychologist Philip Zimbardo conducted an experiment to test a theory that later became known as the Broken Windows Theory (

He parked one car without license plates in a Bronx neighborhood and another in an allegedly "better" neighborhood in Palo Alto. Then he waited.

The car in the Bronx was picked clean of valuable parts within 24 hours and then passersby started to randomly destroy it.

The car in Palo Alto was not touched for a week, so Zimbardo smashed a window. From then on, the car had a similar fate to the car in the Bronx and was destroyed in the same short amount of time by people walking by.

The people taking part in looting and destroying the cars came from all social classes and included people who were otherwise law-abiding and well-behaved citizens.

This human behavior has become known as the Broken Windows Theory. In my own words:

As soon as something looks run...