UpdateHandler.php

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<?php
namespace Magento\Downloadable\Model\Link;

use Magento\Downloadable\Api\LinkRepositoryInterface as LinkRepository;
use Magento\Downloadable\Model\Product\Type;
use Magento\Framework\EntityManager\Operation\ExtensionInterface;

class UpdateHandler implements ExtensionInterface
{
    protected $linkRepository;

    public function __construct(LinkRepository $linkRepository)
    {
        $this->linkRepository = $linkRepository;
    }

    public function execute($entity, $arguments = [])
    {
        if ($entity->getTypeId() != Type::TYPE_DOWNLOADABLE) {
            return $entity;
        }

        $links = $entity->getExtensionAttributes()->getDownloadableProductLinks() ?: [];
        $updatedLinks = [];
        $oldLinks = $this->linkRepository->getList($entity->getSku());
        foreach ($links as $link) {
            if ($link->getId()) {
                $updatedLinks[$link->getId()] = true;
            }
            $this->linkRepository->save($entity->getSku(), $link, !(bool)$entity->getStoreId());
        }
        foreach ($oldLinks as $link) {
            if (!isset($updatedLinks[$link->getId()])) {
                $this->linkRepository->delete($link->getId());
            }
        }

        return $entity;
    }
}