/// <summary> /// Initializes the node manager. /// </summary> public ComDaClientNodeManager(IServerInternal server, string namespaceUri, ComDaClientConfiguration configuration, bool ownsTypeModel) : base(server, namespaceUri, ownsTypeModel) { SystemContext.SystemHandle = m_system = new ComDaClientManager(); SystemContext.NodeIdFactory = this; // save the configuration for the node manager. m_configuration = configuration; // set the alias root. AliasRoot = m_configuration.ServerName; if (String.IsNullOrEmpty(AliasRoot)) { AliasRoot = "DA"; } // set the default parser if none provided. if (configuration.ItemIdParser == null) { configuration.ItemIdParser = new ComItemIdParser(); } // create the list of subscriptions. m_subscriptionManagers = new Dictionary<string, SubscribeRequestManager>(); m_subscriptionManagers[String.Empty] = new SubscribeRequestManager(SystemContext, null, 1000); m_monitoredItems = new Dictionary<uint, SubscribeRequestManager>(); }
/// <summary> /// Initializes the next stage of browsing. /// </summary> private void NextStage() { ComDaClientManager system = (ComDaClientManager)this.SystemContext.SystemHandle; ComDaClient client = system.SelectClient((ServerSystemContext)SystemContext, false); // determine which stage is next based on the reference types requested. for (Stage next = m_stage + 1; next <= Stage.Done; next++) { if (next == Stage.Children) { if (IsRequired(ReferenceTypeIds.Organizes, false)) { m_stage = next; break; } } else if (next == Stage.Properties) { if (IsRequired(ReferenceTypeIds.HasProperty, false)) { m_stage = next; break; } } else if (next == Stage.Parents) { if (IsRequired(ReferenceTypeIds.Organizes, true)) { m_stage = next; break; } } else if (next == Stage.Done) { m_stage = next; break; } } m_position = 0; // start enumerating branches. if (m_stage == Stage.Children) { m_browser = client.CreateBrowser(m_itemId); return; } // start enumerating properties. if (m_stage == Stage.Properties) { m_properties = client.ReadAvailableProperties(m_itemId, true); m_position = 0; return; } // start enumerating parents. if (m_stage == Stage.Parents) { m_parentId = client.FindElementParentId(m_itemId); return; } // all done. }
/// <summary> /// Validates the nodes and reads the values from the underlying source. /// </summary> /// <param name="context">The context.</param> /// <param name="nodesToRead">The nodes to read.</param> /// <param name="values">The values.</param> /// <param name="errors">The errors.</param> /// <param name="nodesToValidate">The nodes to validate.</param> /// <param name="cache">The cache.</param> protected override void Read( ServerSystemContext context, IList <ReadValueId> nodesToRead, IList <DataValue> values, IList <ServiceResult> errors, List <NodeHandle> nodesToValidate, IDictionary <NodeId, NodeState> cache) { ComDaClientManager system = (ComDaClientManager)this.SystemContext.SystemHandle; ComDaClient client = system.SelectClient((ServerSystemContext)SystemContext, false); ReadRequestCollection requests = new ReadRequestCollection(); for (int ii = 0; ii < nodesToValidate.Count; ii++) { NodeHandle handle = nodesToValidate[ii]; lock (Lock) { NodeState source = ValidateNode(context, handle, cache); if (source == null) { continue; } DataValue value = values[handle.Index]; ReadValueId nodeToRead = nodesToRead[handle.Index]; // determine if request can be sent to the server. bool queued = false; errors[handle.Index] = requests.Add(source, nodeToRead, value, out queued); if (queued) { continue; } // read built-in metadata. errors[handle.Index] = source.ReadAttribute( context, nodeToRead.AttributeId, nodeToRead.ParsedIndexRange, nodeToRead.DataEncoding, value); } } // read the values from the server. client.Read(requests); // extract the values from the results. for (int ii = 0; ii < nodesToValidate.Count; ii++) { NodeHandle handle = nodesToValidate[ii]; DataValue value = values[handle.Index]; ReadValueId nodeToRead = nodesToRead[handle.Index]; lock (Lock) { if (!requests.HasResult(nodeToRead)) { continue; } errors[handle.Index] = requests.GetResult(context, handle.Node, nodeToRead, value, context.DiagnosticsMask); } } }
/// <summary> /// Returns the next child. /// </summary> private NodeStateReference NextChild(Stage stage) { ComDaClientManager system = (ComDaClientManager)this.SystemContext.SystemHandle; ComDaClient client = system.SelectClient((ServerSystemContext)SystemContext, false); DaElement element = null; if (stage == Stage.Children) { if (m_browser == null) { return(null); } element = m_browser.Next(); if (element == null) { return(null); } // construct the node. NodeState node = DaModelUtils.ConstructElement(SystemContext, element, m_namespaceIndex); // return the reference. return(new NodeStateReference(ReferenceTypeIds.Organizes, false, node)); } if (stage == Stage.Properties) { if (m_properties == null) { return(null); } for (int ii = m_position; ii < m_properties.Length; ii++) { if (m_properties[ii].PropertyId <= PropertyIds.TimeZone) { continue; } m_position = ii + 1; // construct the node. NodeState node = DaModelUtils.ConstructProperty(SystemContext, m_itemId, m_properties[ii], m_namespaceIndex); // return the reference. return(new NodeStateReference(ReferenceTypeIds.HasProperty, false, node)); } // all done. return(null); } if (stage == Stage.Parents) { if (m_parentId != null) { NodeId parentId = DaModelUtils.ConstructIdForDaElement(m_parentId, -1, m_namespaceIndex); m_parentId = null; return(new NodeStateReference(ReferenceTypeIds.Organizes, true, parentId)); } } return(null); }