controller.php

<?php

$response = new \Response();

try {
    $client->buy('sofa');
} catch (\Exception $e) {
    foreach ($this->exceptionHandlers as $handler) {
        if ($handler->accepts($e)) {
            $response = $handler->handle($e, $response);
        }
    }
}

return $response;

some_handler.php

<?php

class NoProductsLeftHandler implements ExceptionHandler
{
    public function accepts(\Exception $e)
    {
        return $e instanceof NoProductsLeft;
    }
    
    public function handle(\Exception $e, Response $response)
    {
        return new RedirectResponse('back');
    }
}