CacheService.php

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

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)) {
                $pageIdsToClear = array((int)$pageIdsToClear);
            }
            foreach ($pageIdsToClear as $pageId) {
                $this->cacheManager->flushCachesInGroupByTag('pages', 'pageId_' . $pageId);
            }
        }
    }

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