CommandBus simple example

commandbus.php

<?php

class Adhesion
{
    private $firstname;
    private $createdAt;

    public function __construct(string $firstname, string $lastname)
    {
        $this->firstname = $firstname;
        $this->lastname = $lastname;
        $this->createdAt = new \DateTime();
    }

    public function getFirstname(): string
    {
        return $this->firstname;
    }

    public function getLastname(): string
    {
        return $this->lastname;
    }

    public function grtCreatedAt(): \DateTime
    {
        return $this->createAt;
    }
}

class CreateAdhesionCommand
{
    public $firstname;
    public $lastname;
}

class CreateAdhesionCommandHandler
{
    public function handle(CreateAdhesionCommand $command): Adhesion
    {
        $firstname = $command->firstname;
        $lastname = $command->lastname;

        if (!is_string($firstname) || !is_string($lastname)) {
            throw new \InvalidArgumentException('Firstname and lastname must not be null');
        }

        return new Adhesion($firstname, $lastname);
    }
}

class CommandBus
{
    private $commandHandlerMap;

    public function __construct(array $commandHandlerMap)
    {
        $this->commandHandlerMap = $commandHandlerMap;
    }

    public function handle($command)
    {
        $commandClass = get_class($command);
        if (!isset($this->commandHandlerMap[$commandClass])) {
            throw new \InvalidArgumentException('There is no handler defined for command '.$commandClass);
        }

        return $this->commandHandlerMap[$commandClass]->handle($command);
    }
}

$bus = new CommandBus([CreateAdhesionCommand::class => new CreateAdhesionCommandHandler()]);

$command = new CreateAdhesionCommand();
$command->firstname = 'Robin';
$command->lastname = 'Chalas';

$adhesion = $bus->handle($command);

var_dump($adhesion);
dump($adhesion);

Quelques ressources:

• http://williamdurand.fr/2013/08/07/ddd-with-symfony2-folder-structure-and-code-first/ (un peu vieux mais très bien)
• http://ocramius.github.io/doctrine-best-practices (plus avancé mais à voir quand t'attaque dans le dure avec doctrine)