});
        }
    }

    private ExponentialBackoff<AwaitableFileLockReleasedSignal> newExponentialBackoff(int shortTimeoutMs) {
        return ExponentialBackoff.of(shortTimeoutMs, MILLISECONDS, new AwaitableFileLockReleasedSignal());
    }

    @VisibleForTesting
    static class AwaitableFileLockReleasedSignal implements FileLockReleasedSignal, ExponentialBackoff.Signal {