class EarlyRenderingTestController

class EarlyRenderingTestController extends ControllerBase {
    
    /**
     * The renderer.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * Constructs an EarlyRenderingTestController.
     *
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer.
     */
    public function __construct(RendererInterface $renderer) {
        $this->renderer = $renderer;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('renderer'));
    }
    protected function earlyRenderContent() {
        return [
            '#markup' => 'Hello world!',
            '#cache' => [
                'tags' => [
                    'foo',
                ],
            ],
        ];
    }
    public function renderArray() {
        return [
            '#pre_render' => [
                function () {
                    $elements = $this->earlyRenderContent();
                    return $elements;
                },
            ],
        ];
    }
    public function renderArrayEarly() {
        $render_array = $this->earlyRenderContent();
        return [
            '#markup' => $this->renderer
                ->render($render_array),
        ];
    }
    public function ajaxResponse() {
        $response = new AjaxResponse();
        $response->addCommand(new InsertCommand(NULL, $this->renderArray()));
        return $response;
    }
    public function ajaxResponseEarly() {
        $response = new AjaxResponse();
        $response->addCommand(new InsertCommand(NULL, $this->renderArrayEarly()));
        return $response;
    }
    public function response() {
        return new Response('Hello world!');
    }
    public function responseEarly() {
        $render_array = $this->earlyRenderContent();
        return new Response((string) $this->renderer
            ->render($render_array));
    }
    public function responseWithAttachments() {
        return new AttachmentsTestResponse('Hello world!');
    }
    public function responseWithAttachmentsEarly() {
        $render_array = $this->earlyRenderContent();
        return new AttachmentsTestResponse((string) $this->renderer
            ->render($render_array));
    }
    public function cacheableResponse() {
        return new CacheableTestResponse('Hello world!');
    }
    public function cacheableResponseEarly() {
        $render_array = $this->earlyRenderContent();
        return new CacheableTestResponse((string) $this->renderer
            ->render($render_array));
    }
    public function domainObject() {
        return new TestDomainObject();
    }
    public function domainObjectEarly() {
        $render_array = $this->earlyRenderContent();
        $this->renderer
            ->render($render_array);
        return new TestDomainObject();
    }
    public function domainObjectWithAttachments() {
        return new AttachmentsTestDomainObject();
    }
    public function domainObjectWithAttachmentsEarly() {
        $render_array = $this->earlyRenderContent();
        $this->renderer
            ->render($render_array);
        return new AttachmentsTestDomainObject();
    }
    public function cacheableDomainObject() {
        return new CacheableTestDomainObject();
    }
    public function cacheableDomainObjectEarly() {
        $render_array = $this->earlyRenderContent();
        $this->renderer
            ->render($render_array);
        return new CacheableTestDomainObject();
    }

}