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

        public void CreateServerDiagnostics(
            ServerSystemContext systemContext, 
            ServerDiagnosticsSummaryDataType diagnostics,
            NodeValueSimpleEventHandler updateCallback)
        {
            lock (Lock)
            {
                // get the node.
                ServerDiagnosticsSummaryState diagnosticsNode = (ServerDiagnosticsSummaryState)FindPredefinedNode(
                    VariableIds.Server_ServerDiagnostics_ServerDiagnosticsSummary,
                    typeof(ServerDiagnosticsSummaryState));
                                
                // wrap diagnostics in a thread safe object.
                ServerDiagnosticsSummaryValue diagnosticsValue = new ServerDiagnosticsSummaryValue(
                    diagnosticsNode, 
                    diagnostics, 
                    Lock);
                
                // must ensure the first update gets sent.
                diagnosticsValue.Value = null;
                diagnosticsValue.Error = StatusCodes.BadWaitingForInitialData;
                diagnosticsValue.CopyPolicy = Opc.Ua.VariableCopyPolicy.Never;
                diagnosticsValue.OnBeforeRead = OnBeforeReadDiagnostics;
                
                m_serverDiagnostics = diagnosticsValue;
                m_serverDiagnosticsCallback = updateCallback;
                
                // set up handler for session diagnostics array.
                SessionDiagnosticsArrayState array1 = (SessionDiagnosticsArrayState)FindPredefinedNode(
                    VariableIds.Server_ServerDiagnostics_SessionsDiagnosticsSummary_SessionDiagnosticsArray,
                    typeof(SessionDiagnosticsArrayState));
                                            
                if (array1 != null)
                {
                    array1.OnSimpleReadValue = OnReadDiagnosticsArray;
                }
                
                // set up handler for session security diagnostics array.
                SessionSecurityDiagnosticsArrayState array2 = (SessionSecurityDiagnosticsArrayState)FindPredefinedNode(
                    VariableIds.Server_ServerDiagnostics_SessionsDiagnosticsSummary_SessionSecurityDiagnosticsArray,
                    typeof(SessionSecurityDiagnosticsArrayState));
                                            
                if (array2 != null)
                {
                    array2.OnSimpleReadValue = OnReadDiagnosticsArray;
                }
                
                // set up handler for subscription security diagnostics array.
                SubscriptionDiagnosticsArrayState array3 = (SubscriptionDiagnosticsArrayState)FindPredefinedNode(
                    VariableIds.Server_ServerDiagnostics_SubscriptionDiagnosticsArray,
                    typeof(SubscriptionDiagnosticsArrayState));
                                            
                if (array3 != null)
                {
                    array3.OnSimpleReadValue = OnReadDiagnosticsArray;
                }

                // send initial update.
                DoScan(true);
            }
        }