Zend.php

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

class Zend implements \Magento\Framework\Cache\FrontendInterface
{
    protected $_frontend;

    private $frontendFactory;

    private $pid;

    public function __construct(\Closure $frontendFactory)
    {
        $this->frontendFactory = $frontendFactory;
        $this->_frontend = $frontendFactory();
        $this->pid = getmypid();
    }

    public function test($identifier)
    {
        return $this->getFrontEnd()->test($this->_unifyId($identifier));
    }

    public function load($identifier)
    {
        return $this->getFrontEnd()->load($this->_unifyId($identifier));
    }

    public function save($data, $identifier, array $tags = [], $lifeTime = null)
    {
        return $this->getFrontEnd()->save($data, $this->_unifyId($identifier), $this->_unifyIds($tags), $lifeTime);
    }

    public function remove($identifier)
    {
        return $this->getFrontEnd()->remove($this->_unifyId($identifier));
    }

    public function clean($mode = \Zend_Cache::CLEANING_MODE_ALL, array $tags = [])
    {
        // Cleaning modes 'old' and 'notMatchingTag' are prohibited as a trade off for decoration reliability
        if (!in_array(
            $mode,
            [
                \Zend_Cache::CLEANING_MODE_ALL,
                \Zend_Cache::CLEANING_MODE_MATCHING_TAG,
                \Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG
            ]
        )
        ) {
            throw new \InvalidArgumentException(
                "Magento cache frontend does not support the cleaning mode '{$mode}'."
            );
        }
        return $this->getFrontEnd()->clean($mode, $this->_unifyIds($tags));
    }

    public function getBackend()
    {
        return $this->getFrontEnd()->getBackend();
    }

    public function getLowLevelFrontend()
    {
        return $this->getFrontEnd();
    }

    protected function _unifyId($identifier)
    {
        return strtoupper($identifier);
    }

    protected function _unifyIds(array $ids)
    {
        foreach ($ids as $key => $value) {
            $ids[$key] = $this->_unifyId($value);
        }
        return $ids;
    }

    private function getFrontEnd()
    {
        if (getmypid() === $this->pid) {
            return $this->_frontend;
        }
        $frontendFactory = $this->frontendFactory;
        $this->_frontend = $frontendFactory();
        $this->pid = getmypid();
        return $this->_frontend;
    }
}