public static function _read_unbounce_domain_info($options_getter, $options_setter, $fetch_proxyable_url_set, $domain, $expire_now = false)
 {
     $proxyable_url_set = null;
     $cache_max_time_default = 10;
     $ps_domain = $options_getter(UBConfig::UB_PAGE_SERVER_DOMAIN_KEY);
     $domains_info = $options_getter(UBConfig::UB_ROUTES_CACHE_KEY);
     $domain_info = UBUtil::array_fetch($domains_info, $domain, array());
     $proxyable_url_set = UBUtil::array_fetch($domain_info, 'proxyable_url_set');
     $proxyable_url_set_fetched_at = UBUtil::array_fetch($domain_info, 'proxyable_url_set_fetched_at');
     $proxyable_url_set_cache_timeout = UBUtil::array_fetch($domain_info, 'proxyable_url_set_cache_timeout');
     $proxyable_url_set_etag = UBUtil::array_fetch($domain_info, 'proxyable_url_set_etag');
     $cache_max_time = is_null($proxyable_url_set_cache_timeout) ? $cache_max_time_default : $proxyable_url_set_cache_timeout;
     $current_time = time();
     if ($expire_now || is_null($proxyable_url_set) || $current_time - $proxyable_url_set_fetched_at > $cache_max_time) {
         try {
             $can_fetch = UBUtil::get_lock();
             UBLogger::debug('Locking: ' . $can_fetch);
             if ($can_fetch) {
                 $result_array = call_user_func($fetch_proxyable_url_set, $domain, $proxyable_url_set_etag, $ps_domain);
                 list($routes_status, $etag, $max_age, $proxyable_url_set_new) = $result_array;
                 if ($routes_status['status'] == 'NEW') {
                     $domain_info['proxyable_url_set'] = $proxyable_url_set_new;
                     $domain_info['proxyable_url_set_etag'] = $etag;
                     $domain_info['proxyable_url_set_cache_timeout'] = $max_age;
                 } elseif ($routes_status['status'] == 'SAME') {
                     // Just extend the cache
                     $domain_info['proxyable_url_set_cache_timeout'] = $max_age;
                 } elseif ($routes_status['status'] == 'NONE') {
                     $domain_info['proxyable_url_set'] = array();
                     $domain_info['proxyable_url_set_etag'] = null;
                 } elseif ($routes_status['status'] == 'FAILURE') {
                     UBLogger::warning('Route fetching failed');
                 } else {
                     UBLogger::warning("Unknown response from route fetcher: '{$routes_status}'");
                 }
                 // Creation of domain_info entry
                 $domain_info['proxyable_url_set_fetched_at'] = $current_time;
                 $domain_info['last_status'] = $routes_status['status'];
                 if ($routes_status['status'] == 'FAILURE') {
                     $domain_info['failure_message'] = $routes_status['failure_message'];
                 }
                 $domains_info[$domain] = $domain_info;
                 // set autoload to false so that options are always loaded from DB
                 $options_setter(UBConfig::UB_ROUTES_CACHE_KEY, $domains_info, false);
             }
         } catch (Exception $e) {
             UBLogger::warning('Could not update sitemap: ' . $e);
         }
         $release_result = UBUtil::release_lock();
         UBLogger::debug('Unlocking: ' . $release_result);
     }
     return UBUtil::array_select_by_key($domain_info, array('proxyable_url_set', 'proxyable_url_set_fetched_at', 'failure_message', 'last_status'));
 }