C# Ua.MethodState類代碼示例

        /// <summary>
        /// Handles the generate values method.
        /// </summary>
        protected override ServiceResult OnGenerateValues(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            uint count)
        {
            TestDataSystem system = context.SystemHandle as TestDataSystem;

            if (system == null)
            {
                return StatusCodes.BadOutOfService;
            }

            GenerateValue(system, SByteValue);
            GenerateValue(system, ByteValue);
            GenerateValue(system, Int16Value);
            GenerateValue(system, UInt16Value);
            GenerateValue(system, Int32Value);
            GenerateValue(system, UInt32Value);
            GenerateValue(system, UInt32Value);
            GenerateValue(system, Int64Value);
            GenerateValue(system, UInt64Value);
            GenerateValue(system, FloatValue);
            GenerateValue(system, DoubleValue);
            GenerateValue(system, NumberValue);
            GenerateValue(system, IntegerValue);
            GenerateValue(system, UIntegerValue);

            return base.OnGenerateValues(context, method, objectId, count);
        }  

        public override void CreateAddressSpace(IDictionary<NodeId, IList<IReference>> externalReferences)
        {
            base.CreateAddressSpace(externalReferences);
            
            // hard code  a sample branch that has the method added.
            NodeId branchId = DaModelUtils.ConstructIdForDaElement("Static/Simple Types", -1, NamespaceIndex);

            // create the method.
            MethodState method = new MethodState(null);

            method.NodeId = GenerateNodeId();
            method.BrowseName = new QualifiedName("GenerateRandomValues", NamespaceIndex);
            method.DisplayName = method.BrowseName.Name;
            method.Executable = true;
            method.UserExecutable = true;
            method.ReferenceTypeId = ReferenceTypeIds.HasComponent;
            method.Handle = "Static/Simple Types";
            
            method.AddReference(ReferenceTypeIds.HasComponent, true, branchId);
            m_references[branchId] = new IReference[] { new NodeStateReference(ReferenceTypeIds.HasComponent, false, method) };
            
            // save the node for later lookup (all tightly coupled children are added with this call).
            AddPredefinedNode(SystemContext, method);
            
            // register handler.
            method.OnCallMethod = new GenericMethodCalledEventHandler(DoGenerateRandomValues);
        }

        /// <summary>
        /// Handles the generate values method.
        /// </summary>
        protected override ServiceResult OnGenerateValues(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            uint count)
        {
            TestDataSystem system = context.SystemHandle as TestDataSystem;

            if (system == null)
            {
                return StatusCodes.BadOutOfService;
            }

            GenerateValue(system, BooleanValue);
            GenerateValue(system, SByteValue);
            GenerateValue(system, ByteValue);
            GenerateValue(system, Int16Value);
            GenerateValue(system, UInt16Value);
            GenerateValue(system, Int32Value);
            GenerateValue(system, UInt32Value);
            GenerateValue(system, UInt32Value);
            GenerateValue(system, Int64Value);
            GenerateValue(system, UInt64Value);
            GenerateValue(system, FloatValue);
            GenerateValue(system, DoubleValue);
            GenerateValue(system, StringValue);
            GenerateValue(system, DateTimeValue);
            GenerateValue(system, GuidValue);
            GenerateValue(system, ByteStringValue);
            GenerateValue(system, XmlElementValue);
            GenerateValue(system, NodeIdValue);
            GenerateValue(system, ExpandedNodeIdValue);
            GenerateValue(system, QualifiedNameValue);
            GenerateValue(system, LocalizedTextValue);
            GenerateValue(system, StatusCodeValue);
            GenerateValue(system, VariantValue);
            GenerateValue(system, EnumerationValue);
            GenerateValue(system, StructureValue);
            GenerateValue(system, NumberValue);
            GenerateValue(system, IntegerValue);
            GenerateValue(system, UIntegerValue);

            return base.OnGenerateValues(context, method, objectId, count);
        }    

        private ServiceResult OnScalarValue1(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            bool booleanIn,
            sbyte sByteIn,
            byte byteIn,
            short int16In,
            ushort uInt16In,
            int int32In,
            uint uInt32In,
            long int64In,
            ulong uInt64In,
            float floatIn,
            double doubleIn,
            ref bool booleanOut,
            ref sbyte sByteOut,
            ref byte byteOut,
            ref short int16Out,
            ref ushort uInt16Out,
            ref int int32Out,
            ref uint uInt32Out,
            ref long int64Out,
            ref ulong uInt64Out,
            ref float floatOut,
            ref double doubleOut)
        {
            booleanOut = booleanIn;
            sByteOut = sByteIn;
            byteOut = byteIn;
            int16Out = int16In;
            uInt16Out = uInt16In;
            int32Out = int32In;
            uInt32Out = uInt32In;
            int64Out = int64In;
            uInt64Out = uInt64In;
            floatOut = floatIn;
            doubleOut = doubleIn;

            return ServiceResult.Good;
        }

        private ServiceResult OnArrayValue3(       
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            Variant[] variantIn,
            int[] enumerationIn,
            ExtensionObject[] structureIn,
            ref Variant[] variantOut,
            ref int[] enumerationOut,
            ref ExtensionObject[] structureOut)
        {
            variantOut = variantIn;
            enumerationOut = enumerationIn;
            structureOut = structureIn;

            return ServiceResult.Good;
        }        

        /// <summary>
        /// Handles the TimedShelve method.
        /// </summary>
        protected virtual ServiceResult OnTimedShelve(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            double shelvingTime)
        {
            ServiceResult error = null;

            try
            {
                if (!this.EnabledState.Id.Value)
                {
                    return error = StatusCodes.BadConditionDisabled;
                }

                if (shelvingTime <= 0 || (this.MaxTimeShelved != null && shelvingTime > this.MaxTimeShelved.Value))
                {
                    return error = StatusCodes.BadShelvingTimeOutOfRange;
                }

                if (!this.ShelvingState.IsCausePermitted(context, Methods.ShelvedStateMachineType_TimedShelve, false))
                {
                    return error = StatusCodes.BadConditionAlreadyShelved;
                }

                if (OnShelve == null)
                {
                    return error = StatusCodes.BadNotSupported;
                }

                error = OnShelve(context, this, true, false, shelvingTime);

                // report a state change event.
                if (ServiceResult.IsGood(error))
                {
                    ReportStateChange(context, false);
                }
            }
            finally
            {
                if (this.AreEventsMonitored)
                {
                    AuditConditionShelvingEventState e = new AuditConditionShelvingEventState(null);

                    TranslationInfo info = new TranslationInfo(
                        "AuditConditionTimedShelve",
                        "en-US",
                        "The TimedShelve method was called.");

                    e.Initialize(
                        context,
                        this,
                        EventSeverity.Low,
                        new LocalizedText(info),
                        ServiceResult.IsGood(error),
                        DateTime.UtcNow);

                    e.SourceName.Value = "Attribute/Call";

                    e.MethodId = new PropertyState<NodeId>(e);
                    e.MethodId.Value = method.NodeId;

                    e.InputArguments = new PropertyState<object[]>(e);
                    e.InputArguments.Value = new object[] { shelvingTime };

                    ReportEvent(context, e);
                }
            }

            return error;
        }

        /// <summary>
        /// Handles the Unshelve method.
        /// </summary>
        protected virtual ServiceResult OnUnshelve(
            ISystemContext context,
            MethodState method,
            IList<object> inputArguments,
            IList<object> outputArguments)
        {
            ServiceResult error = null;

            try
            {
                if (!this.EnabledState.Id.Value)
                {
                    return error = StatusCodes.BadConditionDisabled;
                }

                if (!this.ShelvingState.IsCausePermitted(context, Methods.ShelvedStateMachineType_Unshelve, false))
                {
                    return error = StatusCodes.BadConditionNotShelved;
                }

                if (OnShelve == null)
                {
                    return error = StatusCodes.BadNotSupported;
                }

                error = OnShelve(context, this, false, false, 0);

                // report a state change event.
                if (ServiceResult.IsGood(error))
                {
                    ReportStateChange(context, false);
                }
            }
            finally
            {
                // raise the audit event.
                if (this.AreEventsMonitored)
                {
                    AuditConditionShelvingEventState e = new AuditConditionShelvingEventState(null);

                    TranslationInfo info = new TranslationInfo(
                        "AuditConditionUnshelve",
                        "en-US",
                        "The Unshelve method was called.");

                    e.Initialize(
                        context,
                        this,
                        EventSeverity.Low,
                        new LocalizedText(info),
                        ServiceResult.IsGood(error),
                        DateTime.UtcNow);

                    e.SourceName.Value = "Attribute/Call";

                    e.MethodId = new PropertyState<NodeId>(e);
                    e.MethodId.Value = method.NodeId;

                    ReportEvent(context, e);
                }
            }

            return error;
        }

        /// <summary>
        /// Creates a new controller file.
        /// </summary>
        private ServiceResult OnCreateController(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            string name,
            ref NodeId nodeId)
        {
            nodeId = null;

            // get the system to use.
            FileSystemMonitor system = context.SystemHandle as FileSystemMonitor;

            if (system == null)
            {
                return StatusCodes.BadOutOfService;
            }

            // get the current dierctory.
            DirectoryInfo directory = GetDirectory(context, this.NodeId);

            if (directory == null || !directory.Exists)
            {
                return StatusCodes.BadOutOfService;
            }

            // build the file path.
            StringBuilder filePath = new StringBuilder();

            filePath.Append(directory.FullName);
            filePath.Append('\\');
            filePath.Append(name);
            filePath.Append(".csv");

            if (File.Exists(filePath.ToString()))
            {
                return StatusCodes.BadNodeIdExists;
            }

            // write a dummy configuration file.
            try
            {
                using (StreamWriter writer = new StreamWriter(filePath.ToString()))
                {
                    writer.WriteLine("Temperature, Double, 15");
                    writer.WriteLine("TemperatureSetPoint, Double, 15");
                }
            }
            catch (Exception e)
            {
                return new ServiceResult(e, StatusCodes.BadUnexpectedError);
            }

            // return the node id.
            nodeId = system.CreateNodeIdFromFilePath(ObjectTypes.ControllerType, filePath.ToString());
            
            return ServiceResult.Good;
        }

        /// <summary>
        /// Calls a method on an object.
        /// </summary>
        protected virtual ServiceResult Call(
            ISystemContext context,
            CallMethodRequest methodToCall,
            MethodState method,
            CallMethodResult result)
        {
            ServerSystemContext systemContext = context as ServerSystemContext;
            List<ServiceResult> argumentErrors = new List<ServiceResult>();
            VariantCollection outputArguments = new VariantCollection();

            ServiceResult error = method.Call(
                context,
                methodToCall.ObjectId,
                methodToCall.InputArguments,
                argumentErrors,
                outputArguments);

            if (ServiceResult.IsBad(error))
            {
                return error;
            }

            // check for argument errors.
            bool argumentsValid = true;

            for (int jj = 0; jj < argumentErrors.Count; jj++)
            {
                ServiceResult argumentError = argumentErrors[jj];

                if (argumentError != null)
                {
                    result.InputArgumentResults.Add(argumentError.StatusCode);

                    if (ServiceResult.IsBad(argumentError))
                    {
                        argumentsValid = false;
                    }
                }
                else
                {
                    result.InputArgumentResults.Add(StatusCodes.Good);
                }

                // only fill in diagnostic info if it is requested.
                if (systemContext.OperationContext != null)
                {
                    if ((systemContext.OperationContext.DiagnosticsMask & DiagnosticsMasks.OperationAll) != 0)
                    {
                        if (ServiceResult.IsBad(argumentError))
                        {
                            argumentsValid = false;
                            result.InputArgumentDiagnosticInfos.Add(new DiagnosticInfo(argumentError, systemContext.OperationContext.DiagnosticsMask, false, systemContext.OperationContext.StringTable));
                        }
                        else
                        {
                            result.InputArgumentDiagnosticInfos.Add(null);
                        }
                    }
                }
            }

            // check for validation errors.
            if (!argumentsValid)
            {
                result.StatusCode = StatusCodes.BadInvalidArgument;
                return result.StatusCode;
            }

            // do not return diagnostics if there are no errors.
            result.InputArgumentDiagnosticInfos.Clear();

            // return output arguments.
            result.OutputArguments = outputArguments;

            return ServiceResult.Good;
        }

        private ServiceResult OnUserArrayValue2(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            DateTime[] dateTimeIn,
            Uuid[] guidIn,
            byte[][] byteStringIn,
            XmlElement[] xmlElementIn,
            NodeId[] nodeIdIn,
            ExpandedNodeId[] expandedNodeIdIn,
            QualifiedName[] qualifiedNameIn,
            LocalizedText[] localizedTextIn,
            StatusCode[] statusCodeIn,
            Variant[] variantIn,
            ref DateTime[] dateTimeOut,
            ref Uuid[] guidOut,
            ref byte[][] byteStringOut,
            ref XmlElement[] xmlElementOut,
            ref NodeId[] nodeIdOut,
            ref ExpandedNodeId[] expandedNodeIdOut,
            ref QualifiedName[] qualifiedNameOut,
            ref LocalizedText[] localizedTextOut,
            ref StatusCode[] statusCodeOut,
            ref Variant[] variantOut)
        {
            dateTimeOut = dateTimeIn;
            guidOut = guidIn;
            byteStringOut = byteStringIn;
            xmlElementOut = xmlElementIn;
            nodeIdOut = nodeIdIn;
            expandedNodeIdOut = expandedNodeIdIn;
            qualifiedNameOut = qualifiedNameIn;
            localizedTextOut = localizedTextIn;
            statusCodeOut = statusCodeIn;
            variantOut = variantIn;

            return ServiceResult.Good;
        }

//.........這裏部分代碼省略.........
                            }
                        }
                    }

                    instance = LockState;
                    break;
                }

                case DsatsDemo.BrowseNames.LockStateAsString:
                {
                    if (createOrReplace)
                    {
                        if (LockStateAsString == null)
                        {
                            if (replacement == null)
                            {
                                LockStateAsString = new PropertyState<string>(this);
                            }
                            else
                            {
                                LockStateAsString = (PropertyState<string>)replacement;
                            }
                        }
                    }

                    instance = LockStateAsString;
                    break;
                }

                case DsatsDemo.BrowseNames.Request:
                {
                    if (createOrReplace)
                    {
                        if (Request == null)
                        {
                            if (replacement == null)
                            {
                                Request = new MethodState(this);
                            }
                            else
                            {
                                Request = (MethodState)replacement;
                            }
                        }
                    }

                    instance = Request;
                    break;
                }

                case DsatsDemo.BrowseNames.Release:
                {
                    if (createOrReplace)
                    {
                        if (Release == null)
                        {
                            if (replacement == null)
                            {
                                Release = new MethodState(this);
                            }
                            else
                            {
                                Release = (MethodState)replacement;
                            }
                        }
                    }

                    instance = Release;
                    break;
                }

                case DsatsDemo.BrowseNames.Approve:
                {
                    if (createOrReplace)
                    {
                        if (Approve == null)
                        {
                            if (replacement == null)
                            {
                                Approve = new MethodState(this);
                            }
                            else
                            {
                                Approve = (MethodState)replacement;
                            }
                        }
                    }

                    instance = Approve;
                    break;
                }
            }

            if (instance != null)
            {
                return instance;
            }

            return base.FindChild(context, browseName, createOrReplace, replacement);
        }

        /// <summary>
        /// Called when the Confirm method is called.
        /// </summary>
        /// <param name="context">The system context.</param>
        /// <param name="method">The method being called.</param>
        /// <param name="objectId">The id of the object.</param>
        /// <param name="eventId">The identifier for the event which is the target for the comment.</param>
        /// <param name="comment">The comment.</param>
        /// <returns>Any error.</returns>
        protected virtual ServiceResult OnConfirmCalled(
            ISystemContext context,
            MethodState method,
            NodeId objectId,
            byte[] eventId,
            LocalizedText comment)
        {
            ServiceResult error = ProcessBeforeConfirm(context, eventId, comment);

            if (ServiceResult.IsGood(error))
            {
                SetConfirmedState(context, true);
                SetComment(context, comment, GetCurrentUserId(context));
            }

            if (this.AreEventsMonitored)
            {
                // report a state change event.
                if (ServiceResult.IsGood(error))
                {
                    ReportStateChange(context, false);
                }

                // raise the audit event.
                AuditConditionConfirmEventState e = new AuditConditionConfirmEventState(null);

                TranslationInfo info = new TranslationInfo(
                    "AuditConditionConfirm",
                    "en-US",
                    "The Confirm method was called.");

                e.Initialize(
                    context,
                    this,
                    EventSeverity.Low,
                    new LocalizedText(info),
                    ServiceResult.IsGood(error),
                    DateTime.UtcNow);

                e.SourceName.Value = "Attribute/Call";

                e.MethodId = new PropertyState<NodeId>(e);
                e.MethodId.Value = method.NodeId;

                e.InputArguments = new PropertyState<object[]>(e);
                e.InputArguments.Value = new object[] { eventId, comment };

                ReportEvent(context, e);
            }

            return error;
        }

 /// <summary>
 /// Creates an instance of an audit event.
 /// </summary>
 protected override AuditUpdateStateEventState CreateAuditEvent(
     ISystemContext context,
     MethodState causeMethod,
     uint causeId)
 {
     return new ProgramTransitionAuditEventState(null);
 }

//.........這裏部分代碼省略.........
                        break;
                    }

                    case NodeClass.VariableType:
                    {
                        BaseVariableTypeState value = new BaseDataVariableTypeState();
                        value.IsAbstract = ((IVariableType)node).IsAbstract;
                        value.Value = m_mapper.ToLocalValue(((IVariableType)node).Value);
                        value.DataType = m_mapper.ToLocalId(((IVariableType)node).DataType);
                        value.ValueRank = ((IVariableType)node).ValueRank;
                        value.ArrayDimensions = new ReadOnlyList<uint>(((IVariableType)node).ArrayDimensions);
                        target = value;
                        break;
                    }

                    case NodeClass.DataType:
                    {
                        DataTypeState value = new DataTypeState();
                        value.IsAbstract = ((IDataType)node).IsAbstract;
                        target = value;
                        break;
                    }

                    case NodeClass.ReferenceType:
                    {
                        ReferenceTypeState value = new ReferenceTypeState();
                        value.IsAbstract = ((IReferenceType)node).IsAbstract;
                        value.InverseName = ((IReferenceType)node).InverseName;
                        value.Symmetric = ((IReferenceType)node).Symmetric;
                        target = value;
                        break;
                    }

                    case NodeClass.Object:
                    {
                        BaseObjectState value = new BaseObjectState(null);
                        value.EventNotifier = ((IObject)node).EventNotifier;
                        target = value;
                        break;
                    }

                    case NodeClass.Variable:
                    {
                        BaseDataVariableState value = new BaseDataVariableState(null);
                        value.Value = m_mapper.ToLocalValue(((IVariable)node).Value);
                        value.DataType = m_mapper.ToLocalId(((IVariable)node).DataType);
                        value.ValueRank = ((IVariable)node).ValueRank;
                        value.ArrayDimensions = new ReadOnlyList<uint>(((IVariable)node).ArrayDimensions);
                        value.AccessLevel = ((IVariable)node).AccessLevel;
                        value.UserAccessLevel = ((IVariable)node).UserAccessLevel;
                        value.Historizing = ((IVariable)node).Historizing;
                        value.MinimumSamplingInterval = ((IVariable)node).MinimumSamplingInterval;
                        target = value;
                        break;
                    }

                    case NodeClass.Method:
                    {
                        MethodState value = new MethodState(null);
                        value.Executable = ((IMethod)node).Executable;
                        value.UserExecutable = ((IMethod)node).UserExecutable;
                        target = value;
                        break;
                    }

                    case NodeClass.View:
                    {
                        ViewState value = new ViewState();
                        value.ContainsNoLoops = ((IView)node).ContainsNoLoops;
                        target = value;
                        break;
                    }
                }

                target.NodeId = handle.NodeId;
                target.BrowseName = m_mapper.ToLocalName(node.BrowseName);
                target.DisplayName = node.DisplayName;
                target.Description = node.Description;
                target.WriteMask = node.WriteMask;
                target.UserWriteMask = node.UserWriteMask;
                target.Handle = node;
                target.OnCreateBrowser = OnCreateBrowser;
            }

            // ignore errors.
            catch
            {
                return null;
            }

            // put root into operation cache.
            if (cache != null)
            {
                cache[handle.NodeId] = target;
            }

            handle.Node = target;
            handle.Validated = true;
            return handle.Node;
        }

        /// <summary>
        /// Invokes the specified cause.
        /// </summary>
        public virtual ServiceResult DoCause(
            ISystemContext context, 
            MethodState causeMethod, 
            uint causeId,
            IList<object> inputArguments,
            IList<object> outputArguments)
        {
            ServiceResult result = null;

            try
            {
                // get the transition.
                uint transitionId = GetTransitionForCause(context, causeId);

                if (transitionId == 0)
                {
                    return StatusCodes.BadNotSupported;
                }

                // check access rights.
                result = InvokeCallback(
                    OnCheckUserPermission,
                    context, 
                    this, 
                    transitionId, 
                    causeId,
                    inputArguments,
                    outputArguments);

                if (ServiceResult.IsBad(result))
                {
                    return result;
                }

                // do the transition.
                result = DoTransition(context, transitionId, causeId, inputArguments, outputArguments);

                if (ServiceResult.IsBad(result))
                {
                    return result;
                }

                // report any changes to state machine.
                ClearChangeMasks(context, true);
            }
            finally
            {
                // report the event.
                if (this.AreEventsMonitored)
                {
                    AuditUpdateStateEventState e = CreateAuditEvent(context, causeMethod, causeId);
                    UpdateAuditEvent(context, causeMethod, causeId, e, result);
                    ReportEvent(context, e);
                }
            }        

            return result;    
        }