*             additional data is needed.
 */
public record RequestTrace(@Nullable String context, @Nullable RequestTrace parent, @Nullable Object data) {

    public static final String CONTEXT_PLUGIN = "plugin";
    public static final String CONTEXT_PROJECT = "project";
    public static final String CONTEXT_BOOTSTRAP = "bootstrap";

    public RequestTrace(RequestTrace parent, Object data) {

                .artifacts(requireNonNull(artifacts, "artifacts cannot be null"))
                .build();
    }

    @NotThreadSafe
    class ArtifactInstallerRequestBuilder {
        Session session;
        RequestTrace trace;
        Collection<ProducedArtifact> artifacts = Collections.emptyList();

        ArtifactInstallerRequestBuilder() {}

        @Nonnull

    }

    @Test
    void testChainedTraces() {
        RequestTrace root = new RequestTrace("root", null, "root-data");
        RequestTrace level1 = new RequestTrace("level1", root, "level1-data");
        RequestTrace level2 = new RequestTrace("level2", level1, "level2-data");
        RequestTrace level3 = new RequestTrace(level2, "level3-data");

        // Verify the chain
        assertNull(root.parent());

@Experimental
abstract class BaseRequest<S extends ProtoSession> implements Request<S> {

    private final S session;
    private final RequestTrace trace;

    protected BaseRequest(@Nonnull S session) {
        this(session, null);
    }

    protected BaseRequest(@Nonnull S session, RequestTrace trace) {
        this.session = requireNonNull(session, "session cannot be null");
        this.trace = trace;
    }

    @Nonnull

        return new ArtifactFactoryRequestBuilder();
    }

    @NotThreadSafe
    class ArtifactFactoryRequestBuilder {
        private Session session;
        private RequestTrace trace;
        private String groupId;
        private String artifactId;
        private String version;
        private String classifier;
        private String extension;
        private String type;

        return new ArtifactFactoryRequestBuilder();
    }

    @NotThreadSafe
    class ArtifactFactoryRequestBuilder {
        private Session session;
        private RequestTrace trace;
        private String groupId;
        private String artifactId;
        private String version;
        private String classifier;
        private String extension;
        private String type;

        Session session;
        RequestTrace trace;
        ArtifactCoordinates artifactCoordinates;
        List<RemoteRepository> repositories;

        public VersionResolverRequestBuilder session(Session session) {
            this.session = session;
            return this;
        }

        public VersionResolverRequestBuilder trace(RequestTrace trace) {
            this.trace = trace;

        Session session;
        RequestTrace trace;
        ArtifactCoordinates artifactCoordinates;
        List<RemoteRepository> repositories;

        public VersionResolverRequestBuilder session(Session session) {
            this.session = session;
            return this;
        }

        public VersionResolverRequestBuilder trace(RequestTrace trace) {
            this.trace = trace;

                .artifacts(requireNonNull(artifacts, "artifacts cannot be null"))
                .build();
    }

    class ArtifactDeployerRequestBuilder {
        Session session;
        RequestTrace trace;
        RemoteRepository repository;
        Collection<ProducedArtifact> artifacts;
        int retryFailedDeploymentCount;

        ArtifactDeployerRequestBuilder() {}

        @Nonnull

                .repositories(repositories)
                .build();
    }

    @NotThreadSafe
    class ArtifactResolverRequestBuilder {
        Session session;
        RequestTrace trace;
        Collection<? extends ArtifactCoordinates> coordinates;
        List<RemoteRepository> repositories;

        ArtifactResolverRequestBuilder() {}

        @Nonnull