TagScope.php

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<?php
namespace Magento\Framework\Cache\Frontend\Decorator;

class TagScope extends \Magento\Framework\Cache\Frontend\Decorator\Bare
{
    private $_tag;

    public function __construct(\Magento\Framework\Cache\FrontendInterface $frontend, $tag)
    {
        parent::__construct($frontend);
        $this->_tag = $tag;
    }

    public function getTag()
    {
        return $this->_tag;
    }

    public function save($data, $identifier, array $tags = [], $lifeTime = null)
    {
        $tags[] = $this->getTag();
        return parent::save($data, $identifier, $tags, $lifeTime);
    }

    public function clean($mode = \Zend_Cache::CLEANING_MODE_ALL, array $tags = [])
    {
        if ($mode == \Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG) {
            $result = false;
            foreach ($tags as $tag) {
                if (parent::clean(\Zend_Cache::CLEANING_MODE_MATCHING_TAG, [$tag, $this->getTag()])) {
                    $result = true;
                }
            }
        } else {
            if ($mode == \Zend_Cache::CLEANING_MODE_ALL) {
                $mode = \Zend_Cache::CLEANING_MODE_MATCHING_TAG;
                $tags = [$this->getTag()];
            } else {
                $tags[] = $this->getTag();
            }
            $result = parent::clean($mode, $tags);
        }
        return $result;
    }
}