private static function _getMemcachePrefix()
{
if (!isset(self::$namespace)) {
$mc = self::getMemcache();
//namespace is incremented in Kwf_Util_ClearCache
//use memcache directly as Zend would not save the integer directly and we can't increment it then
$v = $mc->get(self::$uniquePrefix . 'cache_namespace');
if (!$v) {
$v = time();
$mc->set(self::$uniquePrefix . 'cache_namespace', $v);
}
self::$namespace = self::$uniquePrefix . '-' . $v;
}
return self::$namespace;
}