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namespace Acme\TestBundle\Slot;
 
use eZ\Publish\Core\SignalSlot\Slot as BaseSlot;
use eZ\Publish\APICore\RepositorySignalSlot\RepositorySignal;
use eZ\Publish\SignalSlotAPI\SignalRepository\ContentService;
 
class OnPublishSlot extends BaseSlot
{
    /**
     * @var \eZ\Publish\API\Repository\ContentService
     */
    private $contentService;

    public function __construct( ContentService $contentService )
    {
        $this->contentService = $contentService;
    }
 
    public function receive( Signal $signal )
    {
        if ( !$signal instanceof Signal\ContentService\PublishVersionSignal )
        {
            return;
        }

        // Load published content
        $content = $this->contentService->loadContent( $signal->contentId, null, $signal->versionNo );
        // Do stuff with it...
    }
}