SaveProcessor.php

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<?php
namespace Magento\Config\Model\Config\Importer;

use Magento\Config\Model\PreparedValueFactory;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\Config\Value;
use Magento\Framework\Stdlib\ArrayUtils;

class SaveProcessor
{
    private $valueFactory;

    private $arrayUtils;

    private $scopeConfig;

    public function __construct(
        ArrayUtils $arrayUtils,
        PreparedValueFactory $valueBuilder,
        ScopeConfigInterface $scopeConfig
    ) {
        $this->arrayUtils = $arrayUtils;
        $this->valueFactory = $valueBuilder;
        $this->scopeConfig = $scopeConfig;
    }

    public function process(array $data)
    {
        foreach ($data as $scope => $scopeData) {
            if ($scope === ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
                $this->invokeSave($scopeData, $scope);
            } else {
                foreach ($scopeData as $scopeCode => $scopeCodeData) {
                    $this->invokeSave($scopeCodeData, $scope, $scopeCode);
                }
            }
        }
    }

    private function invokeSave(array $scopeData, $scope, $scopeCode = null)
    {
        $scopeData = array_keys($this->arrayUtils->flatten($scopeData));

        foreach ($scopeData as $path) {
            $value = $this->scopeConfig->getValue($path, $scope, $scopeCode);
            $backendModel = $this->valueFactory->create($path, $value, $scope, $scopeCode);

            if ($backendModel instanceof Value) {
                $backendModel->beforeSave();
                $backendModel->afterSave();
            }
        }
    }
}