Lesson 5: Adding Support for Events

Adding Event support to Server

Added Event Type ControllerEventType with UaModeler Implement Event generation

Figure 5.1:

Get state change events from system

        public override void Startup()
        {
            try
            {
                Console.WriteLine("Starting Lesson5aNodeManager.");

                base.Startup();

                // save the namespaces used by this node manager.
                InstanceNamespaceIndex = AddNamespaceUri("http://yourcompany.com/lesson04a/");
                TypeNamespaceIndex = AddNamespaceUri(yourorganisation.BA.Namespaces.BA);

                // load the model.
                Console.WriteLine("Loading the Controller Model.");
                ImportUaNodeset(Assembly.GetEntryAssembly(), "buildingautomation.xml");

                // initialize the underlying system.
                m_system.Initialize();

                // subscribe to state changed events.
                m_system.BlockStateChanged += new BlockStateChangedEventHandler(UnderlyingSystem_BlockStateChanged);

Register event handler with underlying system

Create Notifier Hierarchy

Server → Controller Folder

                // Create a Folder for Controllers
                CreateObjectSettings settings = new CreateObjectSettings()
                {
                    ParentNodeId = ObjectIds.ObjectsFolder,
                    ReferenceTypeId = ReferenceTypeIds.Organizes,
                    RequestedNodeId = new NodeId("Controllers", InstanceNamespaceIndex),
                    BrowseName = new QualifiedName("Controllers", InstanceNamespaceIndex),
                    TypeDefinitionId = ObjectTypeIds.FolderType,

                    // need to create a notifier hierarchy for events to propagate.
                    NotifierParent = ObjectIds.Server
                };
                CreateObject(Server.DefaultRequestContext, settings);

Controller Folder → Controller (event source)

                    // create object.
                    settings = new CreateObjectSettings()
                    {
                        ParentNodeId = new NodeId("Controllers", InstanceNamespaceIndex),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNodeId = new NodeId(block.Name, InstanceNamespaceIndex),
                        BrowseName = new QualifiedName(block.Name, TypeNamespaceIndex),
                        TypeDefinitionId = typeDefinitionId,

                        // need to create a notifier hierarchy for events to propagate.
                        NotifierParent = new NodeId("Controllers", InstanceNamespaceIndex)
                    };
                    CreateObject(Server.DefaultRequestContext, settings);

Report the event

        private void UnderlyingSystem_BlockStateChanged(int blockAddress, string blockName, int state)
        {
            // create the event.
            GenericEvent e = new GenericEvent(Server.FilterManager);

            // initializ base event type fields
            e.Initialize(
                null, // EventId created by SDK if null
                new NodeId(yourorganisation.BA.ObjectTypes.ControllerEventType, TypeNamespaceIndex), // EventType
                new NodeId(blockName, InstanceNamespaceIndex), // SourceNode
                blockName, // SourceName
                EventSeverity.Medium, // Severity
                "A controller state changed."); // Message

            // set additional event field State
            e.Set(e.ToPath(new QualifiedName(yourorganisation.BA.BrowseNames.State, TypeNamespaceIndex)), state);

            // report the event.
            ReportEvent(e.SourceNode, e);
        }

Figure 5.2:

• Document → Add…
• Select Document “Event View”
• Drag & Drop Server object to Event View
• Call Methods Stop and Start on controller objects