/**
  * Handler for the running upgrade actions
  */
 function maybe_handle_action()
 {
     if (!isset($_GET['page']) || sanitize_key($_GET['page']) !== $this->as3cf->get_plugin_slug() || !isset($_GET['action'])) {
         // input var okay
         return;
     }
     $method_name = 'action_' . sanitize_key($_GET['action']);
     // input var okay
     if (method_exists($this, $method_name)) {
         call_user_func(array($this, $method_name));
     }
 }