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

Factory on Service


Decoupling creation logic also comes in handy in our Services.

Building Specifications

Using Specifications in our Services might be the best example to illustrate how to use Factories within our Services.

Consider the following Service example. Given a request from the outside world, we want to build a feed based on the latest Posts added to the system:

namespace Application\Service;

use Domain\Model\Post;
use Domain\Model\PostRepository;

class LatestPostsFeedService 
{
    private $postRepository;

    public function __construct(PostRepository $postRepository) 
    {
        $this->postRepository = $postRepository;
    }

    /**
     * @param LatestPostsFeedRequest $request
     */
    public function execute($request) 
    {
        $posts = $this->postRepository->latestPosts($request->since);

        return array_map(function(Post $post) {
            return [
                'id' => $post->id()->id(),
                'content' => $post-&gt...