/// <summary>
/// Creates a new area.
/// </summary>
private BaseObjectState CreateArea(SystemContext context, BaseObjectState platforms, string areaName)
{
FolderState area = new FolderState(null);
area.NodeId = new NodeId(areaName, NamespaceIndex);
area.BrowseName = new QualifiedName(areaName, NamespaceIndex);
area.DisplayName = area.BrowseName.Name;
area.EventNotifier = EventNotifiers.SubscribeToEvents | EventNotifiers.HistoryRead | EventNotifiers.HistoryWrite;
area.TypeDefinitionId = Opc.Ua.ObjectTypeIds.FolderType;
platforms.AddNotifier(SystemContext, Opc.Ua.ReferenceTypeIds.HasNotifier, false, area);
area.AddNotifier(SystemContext, Opc.Ua.ReferenceTypeIds.HasNotifier, true, platforms);
AddPredefinedNode(SystemContext, area);
return(area);
}
/// <summary>
/// Does any initialization required before the address space can be used.
/// </summary>
/// <remarks>
/// The externalReferences is an out parameter that allows the node manager to link to nodes
/// in other node managers. For example, the 'Objects' node is managed by the CoreNodeManager and
/// should have a reference to the root folder node(s) exposed by this node manager.
/// </remarks>
public override void CreateAddressSpace(IDictionary <NodeId, IList <IReference> > externalReferences)
{
lock (Lock)
{
base.CreateAddressSpace(externalReferences);
#region Task #A1 - Create Root Folder
// create the root folder.
FolderState root = new FolderState(null);
root.NodeId = GenerateNodeId();
root.BrowseName = new QualifiedName("Root", NamespaceIndex);
root.DisplayName = root.BrowseName.Name;
root.TypeDefinitionId = ObjectTypeIds.FolderType;
// ensure root can be found via the server object.
IList <IReference> references = null;
if (!externalReferences.TryGetValue(ObjectIds.ObjectsFolder, out references))
{
externalReferences[ObjectIds.ObjectsFolder] = references = new List <IReference>();
}
root.AddReference(ReferenceTypeIds.Organizes, true, ObjectIds.ObjectsFolder);
references.Add(new NodeStateReference(ReferenceTypeIds.Organizes, false, root.NodeId));
// save the node for later lookup.
AddPredefinedNode(SystemContext, root);
#endregion
#region Task #A2 - Create Object Instance with a Property
// create the folder object.
BaseObjectState instance = new BaseObjectState(null);
instance.NodeId = GenerateNodeId();
instance.BrowseName = new QualifiedName("Object", NamespaceIndex);
instance.DisplayName = instance.BrowseName.Name;
instance.TypeDefinitionId = ObjectTypeIds.BaseObjectType;
// create a losely coupled relationship with the root object.
root.AddReference(ReferenceTypeIds.Organizes, false, instance.NodeId);
instance.AddReference(ReferenceTypeIds.Organizes, true, root.NodeId);
// create a property.
PropertyState <int> property = new PropertyState <int>(instance);
property.NodeId = GenerateNodeId();
property.BrowseName = new QualifiedName("Property", NamespaceIndex);
property.DisplayName = property.BrowseName.Name;
property.TypeDefinitionId = VariableTypeIds.PropertyType;
property.DataType = DataTypeIds.Int32;
property.ValueRank = ValueRanks.Scalar;
property.MinimumSamplingInterval = MinimumSamplingIntervals.Continuous;
property.AccessLevel = AccessLevels.CurrentReadOrWrite;
property.UserAccessLevel = AccessLevels.CurrentReadOrWrite;
property.Historizing = false;
property.ReferenceTypeId = ReferenceTypeIds.HasProperty;
// create a property that is tightly coupled.
instance.AddChild(property);
// save the node for later lookup (all tightly coupled children are added with this call).
AddPredefinedNode(SystemContext, instance);
#endregion
#region Task #A3 - Create a Variable using the Built-in Type Model
// create the variable.
AnalogItemState <double> variable = new AnalogItemState <double>(instance);
// add optional properties.
variable.InstrumentRange = new PropertyState <Range>(variable);
// instantiate based on the type model. assigns ids automatically using SystemContext.NodeIdFactory
variable.Create(
SystemContext,
GenerateNodeId(),
new QualifiedName("Variable", NamespaceIndex),
null,
true);
// set default values.
variable.EURange.Value = new Range(90, 10);
variable.InstrumentRange.Value = new Range(100, 0);
// tightly coupled.
instance.AddChild(variable);
// need to add it manually since its parent was already added.
AddPredefinedNode(SystemContext, variable);
#endregion
#region Task #A4 - Add Dynamic Behavoir by Updating In-Memory Nodes
m_property = property;
m_simulationTimer = new Timer(DoSimulation, null, 1000, 1000);
#endregion
#region Task #A5 - Add Support for External Nodes
// External nodes are nodes that reference an entity which stored elsewhere.
// These nodes use no memory in the server unless they are accessed.
// The NodeId is a string that is used to create the external node on demand.
root.AddReference(ReferenceTypeIds.Organizes, false, CreateNodeId("Alpha"));
root.AddReference(ReferenceTypeIds.Organizes, false, CreateNodeId("Omega"));
#endregion
#region Task #A7 - Add Support for Method
MethodState method = new MethodState(instance);
method.NodeId = GenerateNodeId();
method.BrowseName = new QualifiedName("Method", NamespaceIndex);
method.DisplayName = method.BrowseName.Name;
method.Executable = true;
method.UserExecutable = true;
method.ReferenceTypeId = ReferenceTypeIds.HasComponent;
instance.AddChild(method);
// create the input arguments.
PropertyState <Argument[]> inputArguments = new PropertyState <Argument[]>(method);
inputArguments.NodeId = GenerateNodeId();
inputArguments.BrowseName = new QualifiedName(BrowseNames.InputArguments);
inputArguments.DisplayName = inputArguments.BrowseName.Name;
inputArguments.TypeDefinitionId = VariableTypeIds.PropertyType;
inputArguments.DataType = DataTypeIds.Argument;
inputArguments.ValueRank = ValueRanks.OneDimension;
inputArguments.MinimumSamplingInterval = MinimumSamplingIntervals.Continuous;
inputArguments.AccessLevel = AccessLevels.CurrentRead;
inputArguments.UserAccessLevel = AccessLevels.CurrentRead;
inputArguments.Historizing = false;
inputArguments.ReferenceTypeId = ReferenceTypeIds.HasProperty;
inputArguments.Value = new Argument[]
{
new Argument()
{
Name = "CurrentCount", Description = "The current count.", DataType = DataTypeIds.Int32, ValueRank = ValueRanks.Scalar
}
};
method.InputArguments = inputArguments;
// create the output arguments.
PropertyState <Argument[]> outputArguments = new PropertyState <Argument[]>(method);
outputArguments.NodeId = GenerateNodeId();
outputArguments.BrowseName = new QualifiedName(BrowseNames.OutputArguments);
outputArguments.DisplayName = outputArguments.BrowseName.Name;
outputArguments.TypeDefinitionId = VariableTypeIds.PropertyType;
outputArguments.DataType = DataTypeIds.Argument;
outputArguments.ValueRank = ValueRanks.OneDimension;
outputArguments.MinimumSamplingInterval = MinimumSamplingIntervals.Continuous;
outputArguments.AccessLevel = AccessLevels.CurrentRead;
outputArguments.UserAccessLevel = AccessLevels.CurrentRead;
outputArguments.Historizing = false;
outputArguments.ReferenceTypeId = ReferenceTypeIds.HasProperty;
outputArguments.Value = new Argument[]
{
new Argument()
{
Name = "NewCount", Description = "The new count.", DataType = DataTypeIds.Int32, ValueRank = ValueRanks.Scalar
}
};
method.OutputArguments = outputArguments;
// save the node for later lookup (all tightly coupled children are added with this call).
AddPredefinedNode(SystemContext, instance);
// register handler.
method.OnCallMethod = new GenericMethodCalledEventHandler(DoMethodCall);
#endregion
#region Task #D6 - Add Support for Notifiers
// enable subscriptions.
root.EventNotifier = EventNotifiers.SubscribeToEvents;
// creating notifier ensures events propogate up the hierarchy when the are produced.
AddRootNotifier(root);
// add link to server object.
if (!externalReferences.TryGetValue(ObjectIds.Server, out references))
{
externalReferences[ObjectIds.Server] = references = new List <IReference>();
}
references.Add(new NodeStateReference(ReferenceTypeIds.HasNotifier, false, root.NodeId));
// add sub-notifiers.
instance.EventNotifier = EventNotifiers.SubscribeToEvents;
instance.AddNotifier(SystemContext, ReferenceTypeIds.HasNotifier, true, root);
root.AddNotifier(SystemContext, ReferenceTypeIds.HasNotifier, false, instance);
#endregion
}
}