function boot()
{
if (!defined('APP_ROOT')) {
define('APP_ROOT', dirname(dirname(__FILE__)));
}
self::$tmp_path = APP_ROOT . '/tmp';
// initialize preference system
include APP_ROOT . '/framework/lib/preferences.php';
self::$prefs = new PreferenceCollection(array(self::$tmp_path));
self::$prefs->read('cache', true, self::$tmp_path);
Timer::start();
}
