@Override
  public void addListener(PromiseListener<Tuple4<T1, T2, T3, T4>> listener) {
    _task.addListener(listener);
  }
@Override
  public void addListener(PromiseListener<Tuple4<T1, T2, T3, T4>> listener) {
    _task.addListener(listener);
  }
@ Override public void addListener ( PromiseListener < Tuple4 < T1 , T2 , T3 , T4 > > listener ) { _task . addListener ( listener ) ; }
{@inheritDoc}
{