// config/bundles.php

return [
    // ...
    Nucleos\DompdfBundle\NucleosDompdfBundle::class => ['all' => true],
];

use Nucleos\DompdfBundle\Factory\DompdfFactoryInterface;
use Nucleos\DompdfBundle\Wrapper\DompdfWrapperInterface;

final class MyService
{
    public function __construct(DompdfFactoryInterface $factory)
    {
        $this->factory = $factory;
    }

    public function render()
    {
        // ...
        /** @var Dompdf\Dompdf $dompdf */
        $dompdf = $this->factory->create();
        // Or pass an array of options:
        $dompdf = $this->factory->create(['chroot' => '/home']);
        // ...
    }
}

final class MyOtherService
{
    public function __construct(DompdfWrapperInterface $wrapper)
    {
        $this->wrapper = $wrapper;
    }

    public function stream()
    {
        // ...
        $html = '<h1>Sample Title</h1><p>Lorem Ipsum</p>';

        /** @var Symfony\Component\HttpFoundation\StreamedResponse $response */
        $response = $this->wrapper->getStreamResponse($html, "document.pdf");
        $response->send();
        // ...
    }

    public function binaryContent()
    {
        // ...
        return $this->wrapper->getPdf($html);
        // ...
    }
}

$html = $this->renderView('my_pdf.html.twig', array(
    // ...
));
$this->wrapper->getStreamResponse($html, 'document.pdf');