private void updateCancellationToken() {
        cancellationToken = new DefaultBuildCancellationToken();
        cancellationToken.addCallback(onCancelCommand);
    }

    @Override
    public void requestCancel() {
        lock.lock();
        try {
            if (state == State.Busy) {
                setState(State.Canceled);
            } else if (state == State.StopRequested) {