/// <summary>
/// 通知节点发生变化。
/// </summary>
/// <param name="watchedEvent">zookeeper sdk监听事件参数。</param>
/// <param name="isFirstConnection">是否是zk第一次连接上服务器。</param>
internal async Task OnChange(WatchedEvent watchedEvent, bool isFirstConnection)
{
//得到节点路径（如果只是状态发送变化则路径为null）
var path = watchedEvent.getPath();
//是否是zk连接状态变更
var stateChanged = path == null;
//如果只是状态变更则进行状态变更处理
if (stateChanged)
{
await OnStatusChangeHandle(watchedEvent, isFirstConnection);
}
else if (path == Path) //如果变化的节点属于自己
{
var eventType = watchedEvent.get_Type();
//是否属于数据变更
var dataChanged = new[]
{
Watcher.Event.EventType.NodeCreated,
Watcher.Event.EventType.NodeDataChanged,
Watcher.Event.EventType.NodeDeleted
}.Contains(eventType);
if (dataChanged)
{
//如果子节点刚刚被创建并且该节点有注册子节点变更监听，则通知zk进行子节点监听（延迟监听）
if (eventType == Watcher.Event.EventType.NodeCreated && HasChildrenChangeHandler)
{
await _client.RetryUntilConnected(() => GetChildrenAsync(true));
}
//进行数据变更处理
await OnDataChangeHandle(watchedEvent);
}
else
{
//进行子节点变更处理
await OnChildrenChangeHandle(watchedEvent);
}
}
}