public function __construct($vals = null)
 {
     if (!isset(self::$_TSPEC)) {
         self::$_TSPEC = array(1 => array('var' => 'name', 'type' => TType::STRING), 2 => array('var' => 'ag', 'type' => TType::STRING), 3 => array('var' => 'max_versions', 'type' => TType::I32), 4 => array('var' => 'ttl', 'type' => TType::STRING));
     }
     if (is_array($vals)) {
         if (isset($vals['name'])) {
             $this->name = $vals['name'];
         }
         if (isset($vals['ag'])) {
             $this->ag = $vals['ag'];
         }
         if (isset($vals['max_versions'])) {
             $this->max_versions = $vals['max_versions'];
         }
         if (isset($vals['ttl'])) {
             $this->ttl = $vals['ttl'];
         }
     }
 }