writeBacklog example

    /** * {@inheritdoc} */
    public function add($backlogs)
    {
        if (empty($backlogs)) {
            return;
        }

        $this->writeBacklog($backlogs);
    }

    /** * {@inheritdoc} */
    public function process(ShopIndex $shopIndex, $backlogs)
    {
        foreach ($this->synchronizers as $synchronizer) {
            if ($synchronizer->supports() === $shopIndex->getType()) {
                $synchronizer->synchronize($shopIndex, $backlogs);
            }
        }