pdoSitemap кеширование

<?php
/** @var modX $modx */
switch ($modx->event->name) {
    case 'OnHandleRequest':
        $host = $_SERVER['HTTP_HOST'];

        /** @var city $cityService */
        $cityService = $modx->getService('city', 'city', MODX_CORE_PATH . 'components/city/model/', array());
        if (!$cityService) {$modx->log(xPDO::LOG_LEVEL_ERROR, 'Could not load city class!');return;}

        $city = $cityService->getCity($host);
        if (empty($city)) {return;}

        $server_protocol = $modx->getOption('server_protocol', array(), 'http');

        if (!$city['active']) {$modx->sendErrorPage();return;}

        foreach ($city as $key => $value) {
            if (in_array($key, $cityService::EXCLUDE_FIELDS) || empty($value)) {continue;}
            else if ($key == 'key') {
                $cityService->setSettings('http_host', $value);
                $cityService->setSettings('site_url', $server_protocol . '://' . $value . '/');
            }
            else if ($key == 'name_site') {
                $cityService->setSettings('site_name', $value);
            }
            else if ($key == 'name') {
                $cityService->setSettings('city', $value);
            }
            else {
                $cityService->setSettings($key, $value);
            }
        }
        break;
}

$cityService->setSettings('http_host', $value);
$cityService->setSettings('site_url', $server_protocol . '://' . $value . '/');