public function __wakeup()
{
if (!isset(self::$_safeMapShare[$this->getSafeMapShareId()])) {
$this->initSafeMap();
self::$_safeMapShare[$this->getSafeMapShareId()] = $this->_safeMap;
} else {
$this->_safeMap = self::$_safeMapShare[$this->getSafeMapShareId()];
}
}