}
    }

    @Override
    public <T> T withFileLock(Supplier<T> factory) {
        incrementLockCount();
        try {
            return factory.get();
        } finally {
            decrementLockCount();
        }
    }

    private void incrementLockCount() {
        stateLock.lock();
        try {
            if (fileLock == null) {
                if (lockCount != 0) {