/** {@inheritDoc} */
  @Override
  public boolean compareAndSet(T expVal, T newVal, S expStamp, S newStamp) throws GridException {
    checkRemoved();

    return CU.outTx(
        internalCompareAndSet(
            F0.equalTo(expVal),
            wrapperClosure(newVal),
            F0.equalTo(expStamp),
            wrapperClosure(newStamp)),
        ctx);
  }