}

    public static boolean isNestableDeferred(@Nullable Object value) {
        return value instanceof Callable
            || isKotlinFunction0Deferrable(value);
    }

    @Nullable
    public static Object unpackNestableDeferred(@Nullable Object deferred) {
        Object current = deferred;
        while (isNestableDeferred(current)) {
            if (current instanceof Callable) {

    final SettableFuture<@Nullable Void> settableFuture = SettableFuture.create();
    ArrayList<ListenableFuture<@Nullable Void>> results = new ArrayList<>(50_001);
    results.add(
        serializer.submitAsync(
            new AsyncCallable<@Nullable Void>() {
              @Override
              public ListenableFuture<@Nullable Void> call() {
                return settableFuture;

    final SettableFuture<@Nullable Void> settableFuture = SettableFuture.create();
    ArrayList<ListenableFuture<@Nullable Void>> results = new ArrayList<>(50_001);
    results.add(
        serializer.submitAsync(
            new AsyncCallable<@Nullable Void>() {
              @Override
              public ListenableFuture<@Nullable Void> call() {
                return settableFuture;

        return INSTANCE;
    }

    @Nullable
    public BuildOperationRef get() {
        return ref.get();
    }

    @Nullable
    public OperationIdentifier getId() {
        BuildOperationRef operationState = get();
        return operationState == null ? null : operationState.getId();
    }

    @Nullable
    public OperationIdentifier getParentId() {

    Callable<@Nullable Void> cancelRunnable =
        new Callable<@Nullable Void>() {
          @Override
          public @Nullable Void call() {
            cancellationSuccess.set(currentFuture.get().cancel(true));
            awaitUnchecked(barrier);
            return null;
          }
        };
    Callable<@Nullable Void> setFutureCompleteSuccessfullyRunnable =

    }

    /**
     * Calls the given callable converting any thrown exception to an unchecked exception via {@link UncheckedException#throwAsUncheckedException(Throwable)}
     *
     * @param callable The callable to call
     * @param <T> Callable's return type
     * @return The value returned by {@link Callable#call()}
     */
    @Nullable
    public static <T> T uncheckedCall(Callable<T> callable) {
        try {

    final CountDownLatch exitLatch = new CountDownLatch(1);
    final TrustedListenableFutureTask<@Nullable Void> task =
        TrustedListenableFutureTask.create(
            new Callable<@Nullable Void>() {
              @Override
              public @Nullable Void call() throws Exception {
                enterLatch.countDown();
                new CountDownLatch(1).await(); // wait forever

    Callable<@Nullable Void> cancelRunnable =
        new Callable<@Nullable Void>() {
          @Override
          public @Nullable Void call() {
            cancellationSuccess.set(currentFuture.get().cancel(true));
            awaitUnchecked(barrier);
            return null;
          }
        };
    Callable<@Nullable Void> setFutureCompleteSuccessfullyRunnable =

    /**
     * The date of the signature artifact.
     *
     * @see #getDate()
     */
    private Date date;

    private Callable<File> toSignGenerator;

    private Callable<String> classifierGenerator;

    @Nullable
    private Callable<String> nameGenerator;

    /**
     * Creates a signature artifact for the given public artifact.
     *

    final CountDownLatch exitLatch = new CountDownLatch(1);
    final TrustedListenableFutureTask<@Nullable Void> task =
        TrustedListenableFutureTask.create(
            new Callable<@Nullable Void>() {
              @Override
              public @Nullable Void call() throws Exception {
                enterLatch.countDown();
                new CountDownLatch(1).await(); // wait forever