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 Plain Code

There are several ways to implement a configuration component responsible for assembling the application. If we are building an application without the support of a dependency injection framework, we can create such a component with plain code:

package copyeditor.configuration;

class Application {

  public static void main(String[] args) {


    AccountRepository accountRepository = new AccountRepository();

    ActivityRepository activityRepository = new ActivityRepository();

    AccountPersistenceAdapter accountPersistenceAdapter =

        new AccountPersistenceAdapter(accountRepository, activityRepository);

    SendMoneyUseCase sendMoneyUseCase =

        new SendMoneyUseService(

            accountPersistenceAdapter, ...