*
     * @return true if any tasks were scheduled, false if not.
     */
    boolean scheduleQueuedTasks();

    /**
     * Prepares the work graph, once all tasks have been scheduled.
     */
    void finalizeWorkGraph();

    /**
     * Must call {@link #scheduleQueuedTasks()} and {@link #finalizeWorkGraph()} prior to calling this method.
     */

        while (tasksDiscovered) {
            tasksDiscovered = false;
            for (BuildController buildController : ImmutableList.copyOf(controllers.values())) {
                if (buildController.scheduleQueuedTasks()) {
                    tasksDiscovered = true;
                }
            }
        }
        for (BuildController buildController : controllers.values()) {
            buildController.finalizeWorkGraph();

        assertInState(State.DiscoveringTasks);
        workGraph.addFinalization(finalization);
    }

    @Override
    public boolean scheduleQueuedTasks() {
        assertInState(State.DiscoveringTasks);

        queuedForExecution.removeAll(scheduled);
        if (queuedForExecution.isEmpty()) {
            return false;
        }