sclass NowFuture<T> implements Future<T> {
  T result;
  *() {}
  *(T *result) {}

  public bool cancel(final boolean b) { false; }
  public bool isCancelled() { false; }
  public boolean isDone() { true; }
  public T get() { ret result; }
  public T get(long l, TimeUnit timeUnit) { ret result; }
}

Adapted from https://stackoverflow.com/questions/13866533/how-to-create-a-completed-future-in-java