Opc.Ua.Server.DiagnosticsNodeManager.UpdateServerDiagnosticsSummary C# (CSharp) Method

        private bool UpdateServerDiagnosticsSummary()
        { 
            // get the latest snapshot.
            object value = null;
            
            ServiceResult result = m_serverDiagnosticsCallback(
                SystemContext, 
                m_serverDiagnostics.Variable, 
                ref value);

            ServerDiagnosticsSummaryDataType newValue = value as ServerDiagnosticsSummaryDataType;

            // check for changes.
            if (Utils.IsEqual(newValue, m_serverDiagnostics.Value))
            {
                return false;
            }
            
            m_serverDiagnostics.Error = null;
            
            // check for bad value.
            if (ServiceResult.IsNotBad(result) && newValue == null)
            {
                result = StatusCodes.BadOutOfService;
            }

            // check for bad result.
            if (ServiceResult.IsBad(result))
            {
                m_serverDiagnostics.Error = result;
                newValue = null;
            }
            
            // update the value.
            m_serverDiagnostics.Value = newValue;
            m_serverDiagnostics.Timestamp = DateTime.UtcNow;

            // notify any monitored items.
            m_serverDiagnostics.ChangesComplete(SystemContext);
            

            return true;
        }