* acquire other locks, risking deadlocks.
   *
   * @param value the value to be used as the result
   * @return true if the attempt was accepted, completing the {@code Future}
   */
  @CanIgnoreReturnValue
  protected boolean set(@ParametricNullness V value) {
    Object valueToSet = value == null ? NULL : value;
    if (ATOMIC_HELPER.casValue(this, null, valueToSet)) {

    notifyAndClearListeners();
  }

  @CanIgnoreReturnValue
  protected boolean set(V value) {
    if (!state.permitsPublicUserToTransitionTo(State.VALUE)) {
      return false;
    }

    forceSet(value);
    return true;
  }

  private void forceSet(V value) {
    this.value = value;
    this.state = State.VALUE;
    notifyAndClearListeners();
  }

  @CanIgnoreReturnValue