如何訪問由Eclipse Milo服務器端的NodeFactory構建的節點實例？

Question

關於服務器端的實現：哪種是訪問（和修改）由NodeFactory生成的特定節點實例的最佳方法？ 例如，在NameSpaceExample中，有一個自定義對象類型MyObjectType，其組件為“ foo”和“ bar”。

// Define a new ObjectType called "MyObjectType".
    UaObjectTypeNode objectTypeNode = UaObjectTypeNode.builder(server.getNodeMap())
        .setNodeId(new NodeId(namespaceIndex, "ObjectTypes/MyObjectType"))
        .setBrowseName(new QualifiedName(namespaceIndex, "MyObjectType"))
        .setDisplayName(LocalizedText.english("MyObjectType"))
        .setIsAbstract(false)
        .build();

    // "Foo" and "Bar" are members. These nodes are what are called "instance declarations" by the spec.
    UaVariableNode foo = UaVariableNode.builder(server.getNodeMap())
        .setNodeId(new NodeId(namespaceIndex, "ObjectTypes/MyObjectType.Foo"))
        .setAccessLevel(ubyte(AccessLevel.getMask(AccessLevel.READ_WRITE)))
        .setBrowseName(new QualifiedName(namespaceIndex, "Foo"))
        .setDisplayName(LocalizedText.english("Foo"))
        .setDataType(Identifiers.Int16)
        .setTypeDefinition(Identifiers.BaseDataVariableType)
        .build();

    foo.setValue(new DataValue(new Variant(0)));
    objectTypeNode.addComponent(foo);

    UaVariableNode bar = UaVariableNode.builder(server.getNodeMap())
        .setNodeId(new NodeId(namespaceIndex, "ObjectTypes/MyObjectType.Bar"))
        .setAccessLevel(ubyte(AccessLevel.getMask(AccessLevel.READ_WRITE)))
        .setBrowseName(new QualifiedName(namespaceIndex, "Bar"))
        .setDisplayName(LocalizedText.english("Bar"))
        .setDataType(Identifiers.String)
        .setTypeDefinition(Identifiers.BaseDataVariableType)
        .build();

    bar.setValue(new DataValue(new Variant("bar")));
    bar.addReference(new Reference(bar.getNodeId(), Identifiers.HasModellingRule, Identifiers.ModellingRule_MandatoryPlaceholder.expanded(), NodeClass.ObjectType, true));
    objectTypeNode.addComponent(bar);


    // Tell the ObjectTypeManager about our new type.
    // This let's us use NodeFactory to instantiate instances of the type.
    server.getObjectTypeManager().registerObjectType(
        objectTypeNode.getNodeId(),
        UaObjectNode.class,
        UaObjectNode::new
    );

    // Add our ObjectTypeNode as a subtype of BaseObjectType.
    server.getUaNamespace().addReference(
        Identifiers.BaseObjectType,
        Identifiers.HasSubtype,
        true,
        objectTypeNode.getNodeId().expanded(),
        NodeClass.ObjectType
    );

    // Add the inverse SubtypeOf relationship.
    objectTypeNode.addReference(new Reference(
        objectTypeNode.getNodeId(),
        Identifiers.HasSubtype,
        Identifiers.BaseObjectType.expanded(),
        NodeClass.ObjectType,
        false
    ));

    // Add it into the address space.
    server.getNodeMap().addNode(objectTypeNode);

    // Use NodeFactory to create instance of MyObjectType called "MyObject".
    // NodeFactory takes care of recursively instantiating MyObject member nodes
    // as well as adding all nodes to the address space.
    UaObjectNode myObject = nodeFactory.createObject(
        new NodeId(namespaceIndex, "HelloWorld/MyObject"),
        new QualifiedName(namespaceIndex, "MyObject"),
        LocalizedText.english("MyObject"),
        objectTypeNode.getNodeId()
    );



    // Add forward and inverse references from the root folder.
    rootFolder.addOrganizes(myObject);

    myObject.addReference(new Reference(
        myObject.getNodeId(),
        Identifiers.Organizes,
        rootFolder.getNodeId().expanded(),
        rootFolder.getNodeClass(),
        false
    ));

使用節點工廠，將創建MyObjectType的實例MyObject，該實例具有（由於類型定義）組件“ foo”和“ bar”。 哪種是最好的訪問方式？ 在客戶端，它會像

VariableNode node = client.getAddressSpace().createVariableNode(new NodeId(namespaceIndex, "HelloWorld/MyObject"));

我知道可以獲取MyObject的引用並遵循它們，但是必須有更好的方法。

任何輸入，不勝感激！

Answer 1

您現在必須通過瀏覽引用或推斷NodeId來獲取它們。

新的NodeFactory工作已經完成，並在PR中等待0.3分支，因此希望在您可以使用NodeFactory實現之前不會太久。