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

Managing Transactions


The Domain Model isn't the place to manage transactions. The operations applied over the Domain Model should be agnostic to the persistence mechanism. A common approach to solving this problem is placing a Facade in the Application layer, thereby grouping related use cases together. When a method of the Facade is invoked from the UI layer, the business method begins a transaction. Once complete, the Facade ends the interaction by committing the transaction. If anything goes wrong, the transaction is rolled back:

use Doctrine\ORM\EntityManager;

class SomeApplicationServiceFacade
{
    private $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function doSomeUseCaseTask()
    {
        try {
            $this->em->getConnection()->beginTransaction();
            // Use domain model

            $this->em->getConnection()->commit();
        } catch (Exception $e) {
             $this->em-&gt...