registry.mutate(ModelReference.of(path, modelMapType), action)
    }

    void realize() {
        registry.realizeNode(path)
    }

    void selfClose() {
        registry.atState(path, ModelNode.State.SelfClosed)
    }

    ModelMap<T> realizeAsModelMap() {
        registry.realize(path, modelMapType)
    }

    T realizeChild(String name) {
        registry.realize(path.child(name), itemType)
    }

    Mutate(ModelNode.State.Mutated, true), // Customisations
    Finalize(ModelNode.State.Finalized, true), // Post customisation default values
    Validate(ModelNode.State.SelfClosed, true); // Post mutation validations

    private final ModelNode.State target;
    private final boolean subjectViewAvailable;

    ModelActionRole(ModelNode.State target, boolean subjectViewAvailable) {

        // This guard is purely an optimisation.
        if (modelNode != null && realized.compareAndSet(false, true)) {
            modelNode.ensureAtLeast(ModelNode.State.SelfClosed);
            for (MutableModelNode node : modelNode.getLinks(ModelType.of(type))) {
                node.ensureAtLeast(ModelNode.State.GraphClosed);
            }
        }
        for (T t : this) {

        DefaultsApplied(true), // Default values have been applied
        Initialized(true),
        Mutated(true),
        Finalized(false),
        SelfClosed(false),
        GraphClosed(false);

        public final boolean mutable;

        State(boolean mutable) {
            this.mutable = mutable;
        }

        public State previous() {

import static org.gradle.model.internal.core.ModelNode.State.GraphClosed;
import static org.gradle.model.internal.core.ModelNode.State.Registered;
import static org.gradle.model.internal.core.ModelNode.State.SelfClosed;

@NotThreadSafe
public class DefaultModelRegistry implements ModelRegistryInternal {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultModelRegistry.class);

    private final String projectPath;

            }
        '''

        then:
        succeeds "t1"

        and:
        output.contains "task container node state when task graph ready: ${ModelNode.State.SelfClosed}"
        output.contains "task container node state after graph closing: ${ModelNode.State.GraphClosed}"
    }

    def "tasks added via task container and not explicitly required but executed are self closed"() {

        ModelNode.State.Mutated         | ModelActionRole.Mutate.name()
        ModelNode.State.Finalized       | ModelActionRole.Finalize.name()
        ModelNode.State.SelfClosed      | ModelActionRole.Validate.name()
        ModelNode.State.GraphClosed     | ModelActionRole.Validate.name()
    }


    def "can get node at state Known"() {

    @Override
    public void discoverTasks() {
        project.fireDeferredConfiguration();
        if (modelNode != null) {
            project.getModelRegistry().atStateOrLater(modelNode.getPath(), ModelNode.State.SelfClosed);
        }
    }

    @Override
    public void prepareForExecution(Task task) {
        assert task.getProject() == project;
        if (modelNode != null && modelNode.hasLink(task.getName())) {