code: @Override
    public void shutdown(ShutdownModeAmp mode)
    {
      for (WorkerDeliver<M> worker : _workers) {
        worker.shutdown(mode);
      }
    }
docs: /*
  @Override
  public void onActive()
  {
  for (WorkerOutbox<M> worker : _workers) {
  worker.onActive();
  }
  }
  
  @Override
  public void onInit()
  {
  for (WorkerOutbox<M> worker : _workers) {
  worker.onInit();
  }
  }