code: public function purgePageCache()
  	{
  		$strCacheDir = StringUtil::stripRootDir(System::getContainer()->getParameter('kernel.cache_dir'));
  
  		$objFolder = new Folder($strCacheDir . '/http_cache');
  		$objFolder->purge();
  
  		// Add a log entry
  		$this->log('Purged the page cache', __METHOD__, TL_CRON);
  	}
docs: Purge the page cache
  
  @todo Replace this with a more sophisticated invalidation routine