newsupernova/vendor/magento/module-paypal/Model/System/Config/Backend/Cron.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Paypal\Model\System\Config\Backend;

class Cron extends \Magento\Framework\App\Config\Value
{
    const CRON_STRING_PATH = 'crontab/default/jobs/paypal_fetch_settlement_reports/schedule/cron_expr';

    const CRON_MODEL_PATH_INTERVAL = 'paypal/fetch_reports/schedule';

    /**
     * @var \Magento\Framework\App\Config\ValueFactory
     */
    protected $_configValueFactory;

    /**
     * @param \Magento\Framework\Model\Context $context
     * @param \Magento\Framework\Registry $registry
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $config
     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
     * @param \Magento\Framework\App\Config\ValueFactory $configValueFactory
     * @param \Magento\Framework\Model\ResourceModel\AbstractResource $resource
     * @param \Magento\Framework\Data\Collection\AbstractDb $resourceCollection
     * @param array $data
     */
    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\App\Config\ValueFactory $configValueFactory,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_configValueFactory = $configValueFactory;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    /**
     * Cron settings after save
     *
     * @return $this
     */
    public function afterSave()
    {
        $cronExprString = '';
        $time = explode(
            ',',
            $this->_configValueFactory->create()->load('paypal/fetch_reports/time', 'path')->getValue()
        );

        if ($this->_configValueFactory->create()->load('paypal/fetch_reports/active', 'path')->getValue()) {
            $interval = $this->_configValueFactory->create()->load(self::CRON_MODEL_PATH_INTERVAL, 'path')->getValue();
            $cronExprString = "{$time[1]} {$time[0]} */{$interval} * *";
        }

        $this->_configValueFactory->create()->load(
            self::CRON_STRING_PATH,
            'path'
        )->setValue(
            $cronExprString
        )->setPath(
            self::CRON_STRING_PATH
        )->save();

        return parent::afterSave();
    }
}