public void OnCampaignListener_OnCampaignVisibilityChanged(string param)
        {
            string[] callbackData = Regex.Split(param, DELIMITER);

            if (callbackData.Length == 2)
            {
                string adspaceName = callbackData[0];
                bool   show        = callbackData[1] == "true"?true:false;

                if (listener != null)
                {
                    listener.OnCampaignVisibilityChanged(adspaceName, show);
                }
            }
        }