gistfile1.php

<?php

class RusyaEventSubscriber implements EventSubscriberInterface
{
    /**
     * @param MessageParser
     */
    protected $parser;

    /**
     * @param EventDispatcher
     */
    protected $dispatcher;

    /**
     * @param MessageParser   $parser
     * @param EventDispatcher $dispatcher
     */
    public function __construct(MessageParser $parser, EventDispatcher $dispatcher)
    {
        $this->parser = $parser;
        $this->dispatcher = $dispatcher;
    }

    /**
     * {@inheritdoc}
     */
    public function getSubscribedEvents()
    {
        return [
            'driver_message' => 'onDriverMessage',
        ];
    }

    /**
     * @param DriverMessageEvent $event
     */
    public function onDriverMessage(DriverMessageEvent $event)
    {
        $message = $event->getMessage();
        $parsedMessage = $this->parser->parse($message);

        foreach ($parsedMessage->extractEvents() as $event) {
            $this->dispatcher->dispatch($event);
        }
    }
}

class CarEventSubscriber implements EventSubscriberInterface
{
    /**
     * @var Car
     */
    protected $car;

    /**
     * @param Car $car
     */
    public function __construct(Car $car)
    {
        $this->car = $car;
    }

    /**
     * {@inheritdoc}
     */
    public function getSubscribedEvents()
    {
        return [
            'rotate_direction_request' => 'onRotateDirectionRequest',
        ];
    }

    /**
     * @param RotateDirectionEvent $event
     */
    public function onRotateDirectionRequest(RotateDirectionEvent $event)
    {
        $degree = $event->getDegree();
        $engine = $this->car->getEngine();

        if ($engine->canRotateDirection()) {
            $engine->rotateDirection($degree);
        }
    }
}