projectId,
                        conflictingProject.getFile(),
                        project.getFile(),
                        "Project '" + projectId + "' is duplicated in the reactor");
            }

            String projectKey = ArtifactUtils.versionlessKey(project.getGroupId(), project.getArtifactId());

     * @return an {@link Optional} containing the project name to resume from, or empty if not specified
     */
    @Nonnull
    Optional<String> resumeFrom();

    /**
     * Returns the list of specified reactor projects to build instead of all projects.
     *
     * @return an {@link Optional} containing the list of project names to build, or empty if not specified
     */
    @Nonnull
    Optional<List<String>> projects();

import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.repository.Proxy;

/**
 * Abstraction of an artifact repository. Artifact repositories can be remote, local, or even build reactor or
 * IDE workspace.
 */
// TODO completely separate local and remote artifact repositories
public class MavenArtifactRepository implements ArtifactRepository {
    private static final String LS = System.lineSeparator();

        List<ArtifactRepository> pomRepositories = null;

        Artifact pomArtifact;

        Artifact relocatedArtifact = null;

        // TODO hack: don't rebuild model if it was already loaded during reactor resolution
        RepositorySystemSession repositorySession = legacySupport.getRepositorySession();
        final WorkspaceReader workspace = repositorySession.getWorkspaceReader();
        Model model;

                throw new ArtifactDescriptorException(result);
            }

            Model model;

            // TODO hack: don't rebuild model if it was already loaded during reactor resolution
            final WorkspaceReader workspace = session.getWorkspaceReader();
            if (workspace instanceof MavenWorkspaceReader mavenWorkspaceReader) {

     */
    @Nonnull
    default String getId() {
        return getModel().getId();
    }

    /**
     * Returns a boolean indicating if the project is the top level project for
     * this reactor build.  The top level project may be different from the
     * {@code rootDirectory}, especially if a subtree of the project is being
     * built, either because Maven has been launched in a subdirectory or using

    /**
     * The full set of projects before any potential constraining by --projects. Useful in the case where you want to
     * build a smaller set of projects but perform other operations in the context of your reactor.
     */
    private List<MavenProject> allProjects;

    private MavenProject topLevelProject;

    private ProjectDependencyGraph projectDependencyGraph;

    private boolean parallel;

    /**

                String msg = str + " aggregator mojo is already being executed "
                        + "in this parallel build, those kind of mojos require exclusive access to "
                        + "reactor to prevent race conditions. This mojo execution will be blocked "
                        + "until the aggregator mojo is done.";
                warn(msg);
                acquiredAggregatorLock.lock();
            }

     *   where multiple modules in the reactor have the same artifactId.
     * <p>
     * {@code -rf :artifactId} will pick up the first module which matches, but when multiple modules in the reactor
     *   have the same artifactId, effective failed module might be later in build reactor.

                    throw new ProjectBuildingException(
                            null,
                            "The projects in the reactor contain a cyclic reference: " + cycle.getMessage(),
                            null,
                            cde);
                }

                throw new ProjectBuildingException(results);
            }