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)

Assembling via Spring's Java Config

While classpath scanning is the cudgel of application assembly, Spring's Java Config is the scalpel. This approach is similar to the plain code approach introduced earlier in this chapter, but it's less messy and provides us with a framework so that we don't have to code everything by hand.

In this approach, we create configuration classes, each responsible for constructing a set of beans that are to be added to the application context.

For example, we could create a configuration class that is responsible for instantiating all of our persistence adapters:



class PersistenceAdapterConfiguration {



  AccountPersistenceAdapter accountPersistenceAdapter(

        AccountRepository accountRepository,

        ActivityRepository activityRepository,