Book Image

Domain-Driven Design in PHP

By : Keyvan Akbary, Carlos Buenosvinos, Christian Soronellas
Book Image

Domain-Driven Design in PHP

By: Keyvan Akbary, Carlos Buenosvinos, Christian Soronellas

Overview of this book

Domain-Driven Design (DDD) has arrived in the PHP community, but for all the talk, there is very little real code. Without being in a training session and with no PHP real examples, learning DDD can be challenging. This book changes all that. It details how to implement tactical DDD patterns and gives full examples of topics such as integrating Bounded Contexts with REST, and DDD messaging strategies. In this book, the authors show you, with tons of details and examples, how to properly design Entities, Value Objects, Services, Domain Events, Aggregates, Factories, Repositories, Services, and Application Services with PHP. They show how to apply Hexagonal Architecture within your application whether you use an open source framework or your own.
Table of Contents (24 chapters)
Title Page
Credits
Foreword
About the Authors
Acknowledgments
www.PacktPub.com
Customer Feedback
Dedication
Preface
14
Bibliography
15
The End

Entities and Domain Events


We'll explore Chapter 6Domain-Events in future chapters; however, it's important to highlight that operations performed on Entities can fire Domain Events. This approach is used to communicate the Domain change to other parts of the Application, or even to other Applications, as you'll see in Chapter 12Integrating Bounded Contexts:

class Post
{
   // ...

    public function publish()
    {
        $this->setStatus(
            Status::published()
        );

        $this->publishedAt(new DateTimeImmutable());

        DomainEventPublisher::instance()->publish(
            new PostPublished($this->id)
        );
    }

    public function unpublish()
    {
        $this->setStatus(
            Status::draft()
        );

        $this-> publishedAt = null;

        DomainEventPublisher::instance()->publish(
            new PostUnpublished($this->id)
        );
    }

    // ...
}

Domain Events can even be fired when a new instance of...