private static function init()
 {
     SimpleDbPersister::$CONFIG_FILE = ROOT_DIRECTORY . "/config/prod/simpledb-config.json";
     $json = file_get_contents(SimpleDbPersister::$CONFIG_FILE);
     $json = json_decode($json, TRUE);
     SimpleDbPersister::$AWS_KEY = $json["aws_access_key"];
     SimpleDbPersister::$AWS_SECRET_KEY = $json["aws_secret_key"];
 }