}

    private Map<String, NamedLockFactory> namedLockFactories;

    public final Map<String, NamedLockFactory> getNamedLockFactories() {
        checkClosed();
        if (namedLockFactories == null) {
            namedLockFactories = createNamedLockFactories();
        }
        return namedLockFactories;
    }

    protected Map<String, NamedLockFactory> createNamedLockFactories() {