protected final boolean wasInterrupted() {
    return mayInterruptIfRunning;
  }

  private void notifyAndClearListeners() {
    afterDone();
    // TODO(lukes): consider adding the StackOverflowError protection from the server version
    // TODO(cpovirk): consider clearing this.delegate
    for (Listener listener : listeners) {
      listener.execute();
    }
    listeners = null;
  }

  protected void afterDone() {}

  // * Future completion is defined by when #value becomes non-null/non SetFuture
  // * Future completion can be observed if the waiters field contains a TOMBSTONE

  // Timed Get
  // There are a few design constraints to consider
  // * We want to be responsive to small timeouts, unpark() has non trivial latency overheads (I
  //   have observed 12 micros on 64-bit linux systems to wake up a parked thread). So if the