}

    @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;

        assertTrue(toString.contains("repositories="));
    }

    @Test
    void testRequestTraceIntegration() {
        Session session = mock(Session.class);
        RequestTrace trace = new RequestTrace("test-context", null, "test-data");

        ArtifactInstallerRequest request =
                ArtifactInstallerRequest.builder().session(session).trace(trace).build();

        return new DependencyCoordinatesFactoryRequestBuilder();
    }

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

import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.RequestTrace;
import org.eclipse.aether.deployment.DeployRequest;
import org.eclipse.aether.deployment.DeployResult;
import org.eclipse.aether.deployment.DeploymentException;
import org.eclipse.aether.metadata.MergeableMetadata;

import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.RequestTrace;
import org.eclipse.aether.installation.InstallRequest;
import org.eclipse.aether.installation.InstallationException;
import org.eclipse.aether.util.artifact.SubArtifact;

/**
 */
@Named
@Singleton

     * This builder provides a fluent API for setting the various properties of a request.
     */
    @NotThreadSafe
    class ProjectBuilderRequestBuilder {
        Session session;
        RequestTrace trace;
        Path path;
        Source source;
        boolean allowStubModel;
        boolean recursive;
        boolean processPlugins = true;
        List<RemoteRepository> repositories;

        return new ModelBuilderRequestBuilder(request);
    }

    @NotThreadSafe
    class ModelBuilderRequestBuilder {
        Session session;
        RequestTrace trace;
        RequestType requestType;
        boolean locationTracking;
        boolean recursive;
        ModelSource source;
        Collection<Profile> profiles;
        List<String> activeProfileIds;