CacheService.php

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<?php
namespace TYPO3\CMS\Extbase\Service;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class CacheService implements \TYPO3\CMS\Core\SingletonInterface
{
    protected $pageIdStack;

    protected $cacheManager;

    public function injectCacheManager(\TYPO3\CMS\Core\Cache\CacheManager $cacheManager)
    {
        $this->cacheManager = $cacheManager;
    }

    public function __construct()
    {
        $this->pageIdStack = new \SplStack;
    }

    public function getPageIdStack()
    {
        return $this->pageIdStack;
    }

    public function clearPageCache($pageIdsToClear = null)
    {
        if ($pageIdsToClear === null) {
            $this->cacheManager->flushCachesInGroup('pages');
        } else {
            if (!is_array($pageIdsToClear)) {
                $pageIdsToClear = [(int)$pageIdsToClear];
            }
            foreach ($pageIdsToClear as $pageId) {
                $this->cacheManager->flushCachesInGroupByTag('pages', 'pageId_' . $pageId);
            }
        }
    }

    public function clearCachesOfRegisteredPageIds()
    {
        if (!$this->pageIdStack->isEmpty()) {
            $pageIds = [];
            while (!$this->pageIdStack->isEmpty()) {
                $pageIds[] = (int)$this->pageIdStack->pop();
            }
            $pageIds = array_values(array_unique($pageIds));
            $this->clearPageCache($pageIds);
        }
    }
}