TransferEvent transferInitiatedEvent = event(session, resource, TransferEvent.EventType.INITIATED);
            TransferEvent transferStartedEvent = event(session, resource, TransferEvent.EventType.STARTED);
            TransferEvent transferProgressedEvent = event(session, resource, TransferEvent.EventType.PROGRESSED);
            TransferEvent transferSucceededEvent = event(session, resource, TransferEvent.EventType.SUCCEEDED);

                .setLocalRepository(session.getLocalRepository())
                .setOffline(session.isOffline())
                .setForceUpdate(session.getRequest().isUpdateSnapshots());
        request.setServers(session.getRequest().getServers());
        request.setMirrors(session.getRequest().getMirrors());
        request.setProxies(session.getRequest().getProxies());

        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession(h -> false); // no close handle
        MavenSessionBuilderSupplier builder = new MavenSessionBuilderSupplier();
        session.setDependencyTraverser(builder.getDependencyTraverser());
        session.setDependencyManager(new ClassicDependencyManager()); // Maven 3 behavior
        session.setDependencySelector(builder.getDependencySelector());

     * @throws SettingsBuilderException if the effective settings could not be built
     */
    @Nonnull
    default SettingsBuilderResult build(
            @Nonnull Session session, @Nonnull Source installationSettingsSource, @Nonnull Source userSettingsSource) {
        return build(session, installationSettingsSource, null, userSettingsSource);
    }

    /**
     * Builds the effective settings of the specified settings paths.
     *

     *            null}.
     * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
     * @return The plugin descriptor, never {@code null}.
     */
    PluginDescriptor getPluginDescriptor(
            Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session)

        @Override
        public void afterSessionStart(MavenSession session) {
            session.getUserProperties().setProperty("injected", "bar");
        }
    }

    public static class InjectReactorDependency extends AbstractMavenLifecycleParticipant {
        @Override
        public void afterProjectsRead(MavenSession session) {
            injectReactorDependency(session.getProjects(), "module-a", "module-b");
        }

            }
            this.session = session;
            this.modelBuilderSession = modelBuilder.newSession();
            // Save the ModelBuilderSession for later retrieval by the DefaultConsumerPomBuilder.
            // Use replace(key, null, value) to make sure the *main* session, i.e. the one used
            // to load the projects, is stored. This is to avoid the session being overwritten

    InstallRequest remapInstallArtifacts(RepositorySystemSession session, InstallRequest request);

    DeployRequest remapDeployArtifacts(RepositorySystemSession session, DeployRequest request);

    void injectTransformedArtifacts(RepositorySystemSession session, MavenProject currentProject) throws IOException;

    void transform(MavenProject project, RepositorySystemSession session, ModelSource src, Path tgt)

        return null;
    }

    @Override
    public MojoDescriptor getMojoDescriptor(
            Plugin plugin, String goal, List<RemoteRepository> repositories, RepositorySystemSession session) {
        return MojoExecutorStub.createMojoDescriptor(plugin);
    }

    @Override
    public ClassRealm getPluginRealm(MavenSession session, PluginDescriptor pluginDescriptor) {

    /**
     * Gets the currently active session.
     *
     * @return The currently active session or {@code null} if none.
     */
    MavenSession getSession();

    /**
     * Gets the currently active repository session.
     *
     * @return The currently active repository session or {@code null} if none.
     */
    RepositorySystemSession getRepositorySession();