function registerActions() {

    $registry = Registry::getInstance();
    $app = $registry->get('application');

    $app->registerAction('POST', __CLASS__, 'login');
    $app->registerAction('POST', __CLASS__, 'add');
    $app->registerAction('POST', __CLASS__, 'edit');
    $app->registerAction('POST', __CLASS__, 'delete');
    $app->registerAction('GET', __CLASS__, 'logout');

} // end of 'registerActions()'