WeakReference<Object> ref = new WeakReference<>(toBeGCed);
    final SettableFuture<@Nullable Void> settableFuture = SettableFuture.create();
    ListenableFuture<?> ignored =
        serializer.submitAsync(
            new AsyncCallable<@Nullable Void>() {
              @Override
              public ListenableFuture<@Nullable Void> call() {
                return settableFuture;
              }
            },
            directExecutor());

     * have completed - namely after oldFuture is done, and taskFuture has either completed or been
     * cancelled before the callable started execution.
     */
    SettableFuture<@Nullable Void> newFuture = SettableFuture.create();

    ListenableFuture<@Nullable Void> oldFuture = ref.getAndSet(newFuture);

    // Invoke our task once the previous future completes.

      assertTrue(Thread.currentThread().isInterrupted());
    } finally {
      Thread.interrupted();
    }
  }

  public void testGetUnchecked_cancelled() {
    SettableFuture<String> future = SettableFuture.create();
    future.cancel(true);
    try {
      getUnchecked(future);
      fail();
    } catch (CancellationException expected) {
    }
  }

   * internal, unbounded pool at the first call to {@code addListener} and holding it until the
   * future is {@linkplain Future#isDone() done}.
   *
   * <p>Prefer to create {@code ListenableFuture} instances with {@link SettableFuture}, {@link
   * MoreExecutors#listeningDecorator( java.util.concurrent.ExecutorService)}, {@link
   * ListenableFutureTask}, {@link AbstractFuture}, and other utilities over creating plain {@code

  }

  public void testLongAsyncRefresh() throws Exception {
    FakeTicker ticker = new FakeTicker();
    CountDownLatch reloadStarted = new CountDownLatch(1);
    SettableFuture<Thread> threadAboutToBlockForRefresh = SettableFuture.create();

    ListeningExecutorService refreshExecutor = listeningDecorator(newSingleThreadExecutor());
    try {
      CacheBuilder<Object, Object> builder =

  }

  public void testLongAsyncRefresh() throws Exception {
    FakeTicker ticker = new FakeTicker();
    CountDownLatch reloadStarted = new CountDownLatch(1);
    SettableFuture<Thread> threadAboutToBlockForRefresh = SettableFuture.create();

    ListeningExecutorService refreshExecutor = listeningDecorator(newSingleThreadExecutor());
    try {
      CacheBuilder<Object, Object> builder =

/**
 * An abstract implementation of {@link ListenableFuture}, intended for advanced users only. More
 * common ways to create a {@code ListenableFuture} include instantiating a {@link SettableFuture},
 * submitting a task to a {@link ListeningExecutorService}, and deriving a {@code Future} from an
 * existing one, typically using methods like {@link Futures#transform(ListenableFuture,

    volatile ValueReference<K, V> oldValue;

    // TODO(fry): rename get, then extend AbstractFuture instead of containing SettableFuture
    final SettableFuture<V> futureValue = SettableFuture.create();
    final Stopwatch stopwatch = Stopwatch.createUnstarted();

    public LoadingValueReference() {
      this(null);
    }

    volatile ValueReference<K, V> oldValue;

    // TODO(fry): rename get, then extend AbstractFuture instead of containing SettableFuture
    final SettableFuture<V> futureValue = SettableFuture.create();
    final Stopwatch stopwatch = Stopwatch.createUnstarted();

    public LoadingValueReference() {
      this(LocalCache.<K, V>unset());
    }

    /*