TaskSegment segment = createTaskSegment();
        projectBuilds.add(createProjectBuild(A, session, segment));
        projectBuilds.add(createProjectBuild(B, session, segment));
        projectBuilds.add(createProjectBuild(C, session, segment));
        projectBuilds.add(createProjectBuild(X, session, segment));
        projectBuilds.add(createProjectBuild(Y, session, segment));

        // default does nothing
    }

    public void projectSucceeded(ExecutionEvent event) {
        // default does nothing
    }

    public void projectFailed(ExecutionEvent event) {
        // default does nothing
    }

    public void forkStarted(ExecutionEvent event) {
        // default does nothing
    }

    public void forkSucceeded(ExecutionEvent event) {

                assertNotNull(event.getSession());
                assertNotNull(event.getProject());
                assertNotNull(event.getExecution());
                assertNotNull(event.getMojo());
                assertNull(event.getCause());

                log.add("beforeMojoExecution " + event.getProject().getArtifactId() + ":"

        }
    }

    @Override
    public void afterProjectExecutionSuccess(ProjectExecutionEvent event) throws LifecycleExecutionException {
        for (ProjectExecutionListener listener : listeners) {
            listener.afterProjectExecutionSuccess(event);
        }
    }

    @Override
    public void afterProjectExecutionFailure(ProjectExecutionEvent event) {

    @Override
    public void buildExtensionsAssembled(ModelBuildingEvent event) {
        Model model = new Model(event.model());

        try {
            pluginRepositories = projectBuildingHelper.createArtifactRepositories(
                    model.getPluginRepositories(), pluginRepositories, projectBuildingRequest);
        } catch (Exception e) {
            event.problems()
                    .add(

        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_DESCRIPTOR_MISSING);
        event.setTrace(trace);
        event.setArtifact(artifact);
        event.setException(exception);

        repositoryEventDispatcher.dispatch(event.build());
    }

    private void invalidDescriptor(

    void beforeProjectExecution(ProjectExecutionEvent event) throws LifecycleExecutionException;

    void beforeProjectLifecycleExecution(ProjectExecutionEvent event) throws LifecycleExecutionException;

    void afterProjectExecutionSuccess(ProjectExecutionEvent event) throws LifecycleExecutionException;

    void afterProjectExecutionFailure(ProjectExecutionEvent event);

            Collection<Listener> listeners = session.getListeners();
            if (!listeners.isEmpty()) {
                Event event = new DefaultEvent(session, ee);
                for (Listener listener : listeners) {
                    listener.onEvent(event);
                }
            }
        }
    }

    @Override
    public void close() throws Exception {}

        boolean parallel = nThreads > 1;
        // Propagate the parallel flag to the root session and all of the cloned sessions in each project segment
        session.setParallel(parallel);
        for (ProjectSegment segment : projectBuilds) {
            segment.getSession().setParallel(parallel);
        }
        ExecutorService executor = Executors.newFixedThreadPool(nThreads, new BuildThreadFactory());

    /**
     * Returns aProjectBuildList that contains only items for the specified taskSegment
     * @param taskSegment the requested task segment
     * @return a project build list for the supplied task segment
     */
    public ProjectBuildList getByTaskSegment(TaskSegment taskSegment) {
        return new ProjectBuildList(