class AbstractClusterInvoker implements ClusterInvoker<T> {

    protected List<Invoker<T>> list(Invocation invocation) throws RpcException {
        return directory.list(invocation);
    }

    public  AbstractClusterInvoker();
    public  AbstractClusterInvoker(Directory<T> directory);
    public  AbstractClusterInvoker(Directory<T> directory, URL url);

}