public <T> List<Future<T>> invokeAll(
     Collection<? extends Callable<T>> callable, long timeout, TimeUnit unit)
     throws InterruptedException {
   return executorService_.invokeAll(callable, timeout, unit);
 }
 public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> callable)
     throws InterruptedException {
   return executorService_.invokeAll(callable);
 }