protected void notify(NotifyEvent event, List<Node> nodes, NotifyListener listener) {
        if (event == null) {
            throw new IllegalArgumentException("notify event == null");
        }
        if (listener == null) {
            throw new IllegalArgumentException("notify listener == null");
        }
        if (CollectionUtils.isEmpty(nodes)) {
            LOGGER.warn("Ignore empty notify nodes for subscribe node " + getNode());
            return;
        }

        listener.notify(event, nodes);
    }
@author Robert HG (254963746@qq.com) on 5/17/15.
lts-core/src/main/java/com/github/ltsopensource/core/registry/AbstractRegistry.java