Value.php

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<?php
namespace Magento\Framework\App\Config;

class Value extends \Magento\Framework\Model\AbstractModel implements \Magento\Framework\App\Config\ValueInterface
{
    protected $_eventPrefix = 'config_data';

    protected $_eventObject = 'config_data';

    protected $_config;

    protected $cacheTypeList;

    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\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_config = $config;
        $this->cacheTypeList = $cacheTypeList;
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

    public function isValueChanged()
    {
        return $this->getValue() != $this->getOldValue();
    }

    public function getOldValue()
    {
        return (string)$this->_config->getValue(
            $this->getPath(),
            $this->getScope() ?: ScopeConfigInterface::SCOPE_TYPE_DEFAULT,
            $this->getScopeCode()
        );
    }

    public function getFieldsetDataValue($key)
    {
        $data = $this->_getData('fieldset_data');
        return is_array($data) && isset($data[$key]) ? $data[$key] : null;
    }

    public function afterSave()
    {
        if ($this->isValueChanged()) {
            $this->cacheTypeList->invalidate(\Magento\Framework\App\Cache\Type\Config::TYPE_IDENTIFIER);
        }

        return parent::afterSave();
    }

    public function afterDelete()
    {
        $this->cacheTypeList->invalidate(\Magento\Framework\App\Cache\Type\Config::TYPE_IDENTIFIER);

        return parent::afterDelete();
    }
}