public function onInstalledConfigureShmop(InstalledEvent $event)
    {
        // use Shmop as driver for Cache Time Keeper
        if ($event->getPackage()->getName() == self::PACKAGE_SHMOP) {
            $this->parameters->set('cache_time_keeper.driver', 'cache_time_keeper.driver.multi');
            $this->parameters->set('cache_time_keeper.driver.multi.fast', 'cache_time_keeper.driver.shmop');
        }
    }