FluentFuture<?> f =
        FluentFuture.from(immediateFailedFuture(new CustomRuntimeException()))
            .catching(
                Throwable.class,
                new Function<Throwable, Class<?>>() {
                  @Override
                  public Class<?> apply(Throwable input) {
                    return input.getClass();
                  }
                },
                directExecutor());

      return weakSetValidator();
    }
  }

  // TODO(cpovirk): change parameter order to match other helper methods (Class, Throwable)?
  private static <X extends Exception> void wrapAndThrowExceptionOrError(
      Throwable cause, Class<X> exceptionClass) throws X {
    if (cause instanceof Error) {
      throw new ExecutionError((Error) cause);
    }

    public void fatal(final String message, final Throwable t) {
        logger.fatal(message, t);
    }

    @Override
    public boolean isErrorEnabled() {
        return logger.isErrorEnabled();
    }

    @Override
    public void error(final String message) {
        logger.error(message);
    }

    @Override
    public void error(final String message, final Throwable t) {
        logger.error(message, t);
    }

    protected boolean setException(Throwable throwable) {
      boolean result = sync.setException(checkNotNull(throwable));
      if (result) {
        executionList.execute();
      }
      return result;
    }

    /**
     * Following the contract of {@link AbstractQueuedSynchronizer} we create a private subclass to
     * hold the synchronizer. This synchronizer is used to implement the blocking and waiting calls

    }

    @Override
    public void fatal(final String message) {
        logger.logp(Level.SEVERE, sourceClass, null, message);
    }

    @Override
    public void fatal(final String message, final Throwable t) {
        logger.logp(Level.SEVERE, sourceClass, null, message, t);
    }

    @Override
    public boolean isErrorEnabled() {
        return logger.isLoggable(Level.SEVERE);
    }

    @Override

   * returns the expected data.
   *
   * @throws Throwable if the listener isn't called or if it resulted in a throwable or if the
   *     result doesn't match the expected value.
   */
  public void assertSuccess(Object expectedData) throws Throwable {
    // Verify that the listener executed in a reasonable amount of time.
    Assert.assertTrue(countDownLatch.await(1L, SECONDS));

        Throwable a, Throwable b, Throwable c, Throwable d, Throwable e) {}

    public ExceptionWithManyConstructors(
        Throwable a, Throwable b, Throwable c, Throwable d, Throwable e, String s, Integer i) {}
  }

  public static final class ExceptionWithoutThrowableConstructor extends Exception {
    public ExceptionWithoutThrowableConstructor(String s) {
      super(s);
    }
  }

   */
  data class ConnectResult(
    val plan: Plan,
    val nextPlan: Plan? = null,
    val throwable: Throwable? = null,
  ) {
    val isSuccess: Boolean
      get() = nextPlan == null && throwable == null
  }

abstract class InterruptibleTask<T extends @Nullable Object> implements Runnable {

  @Override
  public void run() {
    T result = null;
    Throwable error = null;
    if (isDone()) {
      return;
    }
    try {
      result = runInterruptibly();
    } catch (Throwable t) {
      error = t;
    }
    if (error == null) {
      // The cast is safe because of the `run` and `error` checks.

  // & this future completes. Released when the future releases the reference to the running state
  private @Nullable Set<Throwable> seenExceptions = null;
  private int remaining;

  AggregateFutureState(int remainingFutures) {
    this.remaining = remainingFutures;
  }

  final Set<Throwable> getOrInitSeenExceptions() {
    if (seenExceptions == null) {
      seenExceptions = newHashSet();