/**
  * @param string                     $value         value to geocode
  * @param float                      $duration      geocoding duration
  * @param string                     $providerClass Geocoder provider class name
  * @param \SplObjectStorage|Geocoded $results
  */
 public function logRequest($value, $duration, $providerClass, $results)
 {
     if (null !== $this->logger) {
         $this->logger->info(sprintf("%s %0.2f ms (%s)", $value, $duration, $providerClass));
     }
     $data = array();
     if ($results instanceof \SplObjectStorage) {
         $data = array();
         foreach ($results as $result) {
             $data[] = $result->toArray();
         }
     } else {
         $data = $results->toArray();
     }
     $this->requests[] = array('value' => $value, 'duration' => $duration, 'providerClass' => $providerClass, 'result' => json_encode($data));
 }