Opc.Ua.Server.MasterNodeManager.Call C# (CSharp) Method

        public virtual void Call(
            OperationContext               context, 
            CallMethodRequestCollection    methodsToCall,
            out CallMethodResultCollection results,
            out DiagnosticInfoCollection   diagnosticInfos)
        {
            if (context == null)       throw new ArgumentNullException("context");
            if (methodsToCall == null) throw new ArgumentNullException("methodsToCall");
            
            bool diagnosticsExist = false;
            results = new CallMethodResultCollection(methodsToCall.Count);
            diagnosticInfos = new DiagnosticInfoCollection(methodsToCall.Count);
            List<ServiceResult> errors = new List<ServiceResult>(methodsToCall.Count);

            // add placeholder for each result.
            bool validItems = false;

            for (int ii = 0; ii < methodsToCall.Count; ii++)
            {
                results.Add(null);
                errors.Add(null);

                if ((context.DiagnosticsMask & DiagnosticsMasks.OperationAll) != 0)
                {
                    diagnosticInfos.Add(null);
                }

                // validate request paramaters.
                errors[ii] = ValidateCallRequestItem(methodsToCall[ii]);

                if (ServiceResult.IsBad(errors[ii]))
                {
                    methodsToCall[ii].Processed = true;

                    // add diagnostics if requested.
                    if ((context.DiagnosticsMask & DiagnosticsMasks.OperationAll) != 0)
                    {
                        diagnosticInfos[ii] = ServerUtils.CreateDiagnosticInfo(m_server, context, errors[ii]);
                        diagnosticsExist = true;
                    }

                    continue;
                }                

                // found at least one valid item.
                validItems = true;
                methodsToCall[ii].Processed = false;
            }
            
            // call each node manager.
            if (validItems)
            {
                foreach (INodeManager nodeManager in m_nodeManagers)
                {
                    nodeManager.Call(
                        context,
                        methodsToCall,
                        results,
                        errors);
                }
            }
                            
            for (int ii = 0; ii < methodsToCall.Count; ii++)
            {
                // set an error code for calls that were not handled by any node manager.
                if (!methodsToCall[ii].Processed)
                {
                    results[ii] = new CallMethodResult();
                    errors[ii] = StatusCodes.BadNodeIdUnknown;
                }

                // update the diagnostic info and ensure the status code in the result is the same as the error code.
                if (errors[ii] != null && errors[ii].Code != StatusCodes.Good)
                {
                    if (results[ii] == null)
                    {
                        results[ii] = new CallMethodResult();
                    }

                    results[ii].StatusCode = errors[ii].Code;
                    
                    // add diagnostics if requested.
                    if ((context.DiagnosticsMask & DiagnosticsMasks.OperationAll) != 0)
                    {
                        diagnosticInfos[ii] = ServerUtils.CreateDiagnosticInfo(m_server, context, errors[ii]);
                        diagnosticsExist = true;
                    }
                }
            }

            // clear the diagnostics array if no diagnostics requested or no errors occurred.
            UpdateDiagnostics(context, diagnosticsExist, ref diagnosticInfos);
        }