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C# 连接使用Zookeeper C#怎样连接使用Zookeeper

没有星星的夏季   2021-06-24 我要评论
想了解C#怎样连接使用Zookeeper的相关内容吗没有星星的夏季在本文为您仔细讲解C# 连接使用Zookeeper的相关知识和一些Code实例欢迎阅读和指正我们先划重点:C#,连接Zookeeper,C#,使用Zookeeper下面大家一起来学习吧

  Zookeeper作为分布式的服务框架虽然是java写的但是强大的C#也可以连接使用

  C#要连接使用Zookeeper需要借助第三方插件而现在主要有两个插件可供使用分别是ZooKeeperNetEx和Zookeeper.Net
  Zookeeper.Net好像是是Apache官方提供的但是5年没更新了也就是说他依赖于.net framework因此无法在.net core项目中使用

  ZooKeeperNetEx是从java改过来的因此里面的一些习惯是java风格的但是好像有人在提供更新维护支持最新的Zookeeper特性而且摆脱了对.net framework的依赖所以个人推荐使用ZooKeeperNetEx做开发本文也已介绍ZooKeeperNetEx为主  

  新建一个控制台项目在nuget中搜索ZooKeeperNetEx并安装最新版

   在Program的Main方法:  

using org.apache.zookeeper;
using org.apache.zookeeper.data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace AspNetCore.ZookeeperConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            //Zookeeper连接字符串采用host:port格式多个地址之间使用逗号(,)隔开
            string connectionString = "192.168.209.133:2181,192.168.209.133:2181,192.168.209.133:2181";
            //会话超时时间,单位毫秒
            int sessionTimeOut = 10000;
            //异步监听
            var watcher = new MyWatcher("ConnectWatcher");
            //连接
            ZooKeeper zooKeeper = new ZooKeeper(connectionString, sessionTimeOut, watcher);
            Thread.Sleep(1000);//停一秒等待连接完成
            while (zooKeeper.getState() == ZooKeeper.States.CONNECTING)
            {
                Console.WriteLine("等待连接完成...");
                Thread.Sleep(1000);
            }

            var state = zooKeeper.getState();
            if (state != ZooKeeper.States.CONNECTED && state != ZooKeeper.States.CONNECTEDREADONLY)
            {
                Console.WriteLine("连接失败:" + state);
                Console.ReadKey();
                return;
            }

            //创建znode节点
            {
                var data = Encoding.UTF8.GetBytes("hello world");
                List<ACL> acl = ZooDefs.Ids.OPEN_ACL_UNSAFE;//创建节点时的acl权限也可以使用下面的自定义权限
                //List<ACL> acl = new List<ACL>() {
                //    new ACL((int)ZooDefs.Perms.READ, new Id("ip", "127.0.0.1")),
                //    new ACL((int)(ZooDefs.Perms.READ | ZooDefs.Perms.WRITE), new Id("auth", "id:pass"))
                //};
                CreateMode createMode = CreateMode.PERSISTENT;
                zooKeeper.createAsync("/mynode", data, acl, createMode).Wait();
                Console.WriteLine("完成创建节点");
            }

            //节点是否存在
            {
                var exists = zooKeeper.existsAsync("/mynode", new MyWatcher("ExistsWatcher")).GetAwaiter().GetResult();
                Console.WriteLine("节点是否存在:" + exists);
            }

            //获取节点数据
            {
                var dataResult = zooKeeper.getDataAsync("/mynode", new MyWatcher("GetWatcher")).GetAwaiter().GetResult();
                var value = Encoding.UTF8.GetString(dataResult.Data);
                Console.WriteLine("完成读取节点:" + value);
            }

            //设置节点数据
            {
                var data = Encoding.UTF8.GetBytes("hello world again");
                zooKeeper.setDataAsync("/mynode", data);
                Console.WriteLine("设置节点数据");
            }

            //重新获取节点数据
            {
                var dataResult = zooKeeper.getDataAsync("/mynode", new MyWatcher("GetWatcher")).GetAwaiter().GetResult();
                var value = Encoding.UTF8.GetString(dataResult.Data);
                Console.WriteLine("重新获取节点数据:" + value);
            }

            //移除节点
            {
                zooKeeper.deleteAsync("/mynode").Wait();
                Console.WriteLine("移除节点");
            }

            Console.WriteLine("完成");
            Console.ReadKey();
        }
    }

    class MyWatcher : Watcher
    {
        public string Name { get; private set; }

        public MyWatcher(string name)
        {
            this.Name = name;
        }

        public override Task process(WatchedEvent @event)
        {
            var path = @event.getPath();
            var state = @event.getState();

            Console.WriteLine($"{Name} recieve: Path-{path}     State-{@event.getState()}    Type-{@event.get_Type()}");
            return Task.FromResult(0);
        }
    }
}

  运行后显示结果:

    这个简单的例子是使用ZooKeeperNetEx操作的简单例子下面具体介绍

  ZooKeeperNetEx连接Zookeeper只需要实例化ZooKeeper对象即可  

   //Zookeeper连接字符串采用host:port格式多个地址之间使用逗号(,)隔开
   string connectionString = "192.168.209.133:2181,192.168.209.133:2181,192.168.209.133:2181";
   //会话超时时间,单位毫秒
   int sessionTimeOut = 10000;
   //异步监听
   var watcher = new MyWatcher("ConnectWatcher");
   //连接
   ZooKeeper zooKeeper = new ZooKeeper(connectionString, sessionTimeOut, watcher);

  实例化过程中至少需要三个参数

  连接字符串(connectstring):host:port形式多个地址之间使用英文逗号隔开

  会话超时时间(sessionTimeout):当会话中Zookeeper超过此时间未响应则表示会话超时

  监听器(watcher):这个连接过程中可以注册一个监听器当连接过程中出现状态改变时会通知到监听器

  ZooKeeper对象实例化过程中会异步的去连接Zookeeper所以例子中才有一个while循环来判断状态  

   Thread.Sleep(1000);//停一秒等待连接完成
   while (zooKeeper.getState() == ZooKeeper.States.CONNECTING)
   {
       Console.WriteLine("等待连接完成...");
       Thread.Sleep(1000);
   }

   而Zookeeper的连接状态有6种:  

  //ZooKeeper.States的枚举
  CONNECTING = 0,  //连接中
  CONNECTED = 1,   //已连接
  CONNECTEDREADONLY = 2,  //已连接但是只能只读访问
  CLOSED = 3,    //已关闭连接
  AUTH_FAILED = 4,    //认证失败
  NOT_CONNECTED = 5  //未连接

  当应用连接到Zookeeper时一般都是读取数据所以主需要只读连接就可以满足的不过具体还是要看需求

  当在指定的会话时间内未成功连接时则会导致连接超时因为这个过程是异步的所以需要一个监听器来接收

  监听器其实是org.apache.zookeeper.Watcher的一个子类这个需要开发者去继承实现它的process方法比如上面的例子中我们就简单的实现

    class MyWatcher : Watcher
    {
        public string Name { get; private set; }

        public MyWatcher(string name)
        {
            this.Name = name;
        }

        public override Task process(WatchedEvent @event)
        {
            var path = @event.getPath();
            var state = @event.getState();

            Console.WriteLine($"{Name} recieve: Path-{path}     State-{@event.getState()}    Type-{@event.get_Type()}");
            return Task.FromResult(0);
        }
    }

  这里仅仅只是简单的输出节点路径、监听事件响应状态和监听事件类型  

  //监听事件响应状态Watcher.Event.KeeperState的枚举
  Expired = -112,    //连接超时
  Disconnected = 0,    //连接断开
  SyncConnected = 3,    //已同步连接
  AuthFailed = 4,    //认证失败
  ConnectedReadOnly = 5    //只读连接  //监听事件类型Watcher.Event.EventType的枚举  None = -1,    //非节点操作事件
  NodeCreated = 1,    //创建节点事件
  NodeDeleted = 2,    //删除节点事件
  NodeDataChanged = 3,    //节点数据改变
  NodeChildrenChanged = 4    //子节点发生改变

  为什么要有监听器?监听器就类似一个回调当发生某个事件时我们的应用可能需要进行相应的处理如当连接断开时由于监听器的存在我们可以让我们的应用程序重新与Zookeeper建立连接

  ZooKeeperNetEx创建znode节点使用的是createAsync异步方法传入4个参数分别是

  节点路径(path)::创建的节点路径

  节点数据(data):节点数据它是一个字节数组可以通过编码将字符串转化为字符数组

  ACL权限(acl):ACL权限可以使用已定义好的也可以使用自定义如:  

  //已经定义好的ZooDefs.Ids的枚举    
  OPEN_ACL_UNSAFE:完全开放
  CREATOR_ALL_ACL:创建该znode的连接拥有所有权限
  READ_ACL_UNSAFE:所有的客户端都可读

  自定义方式如:  

    List<ACL> acl = new List<ACL>() {
      new ACL((int)ZooDefs.Perms.READ, new Id("ip", "127.0.0.1")),
      new ACL((int)(ZooDefs.Perms.READ | ZooDefs.Perms.WRITE), new Id("auth", "id:pass"))
    };

  节点类型(createMode):节点类型有4种分别是CreateMode类的4个静态字段  

    PERSISTENT:持久化节点
    PERSISTENT_SEQUENTIAL:持久化有序节点
    EPHEMERAL:临时节点(连接断开自动删除)
    EPHEMERAL_SEQUENTIAL:临时有序节点(连接断开自动删除)

  createAsync异步方法会返回实际创建的znode路径貌似没什么用(在创建顺序节点时会用到当一个新的znode被创建为一个顺序节点时ZooKeeper通过将10位的序列号附加到原始名称来设置znode的路径)

  上面这个是ZooKeeperNetEx创建znode节点的方法而对znode的其他操作的参数就很简单了这里就不在重述需要具体操作才能理解一个简单的介绍如下: 

    //删除znode节点
    public Task deleteAsync(string path, int version = -1);
    //指定的znode节点是否存在
    public Task<Stat> existsAsync(string path, Watcher watcher);
    public Task<Stat> existsAsync(string path, bool watch = false);
    //获取znode节点数据
    public Task<DataResult> getDataAsync(string path, bool watch = false);
    public Task<DataResult> getDataAsync(string path, Watcher watcher);
    //设置指定znode节点的数据
    public Task<Stat> setDataAsync(string path, byte[] data, int version = -1);
    //获取指定znode节点的子节点注意监听器是注册给当前节点的而非子节点
    public Task<ChildrenResult> getChildrenAsync(string path, Watcher watcher);
    public Task<ChildrenResult> getChildrenAsync(string path, bool watch = false);

  可以比较一下上一节介绍的zkCli对znode节点的操作就很容易理解了

  另外需要注意的是existsAsync方法、getDataAsync方法和getChildrenAsync方法可以在指定的znode注册一个监听器setDataAsync方法却没有这个注册功能这个是因为Zookeeper注册的监听器只会响应一次当需要再次响应时需要重新注册这时就可以调用existsAsync方法或者getDataAsync方法或者getChildrenAsync方法进行重新注册了!

  上一节说到ACL权限不仅可以在创建是给予在创建后也可以修改ZookeeperNetEx操作znode的ACL权限使用的方法如下:  

    //获取ACL权限
    public Task<ACLResult> getACLAsync(string path);
    //设置ACL权限
    public Task<Stat> setACLAsync(string path, List<ACL> acl, int aclVersion = -1);

  说到ACL自然就会认证存在ZookeeperNetEx添加认证使用的是addAuthInfo方法  

    public void addAuthInfo(string scheme, byte[] auth);

  其中scheme就是我们上一节介绍的那几种: 

   world:默认模式所有客户端都拥有指定的权限world下只有一个id选项就是anyone通常组合写法为world:anyone:[permissons];
   auth:只有经过认证的用户才拥有指定的权限通常组合写法为auth:user:password:[permissons]使用这种模式时你需要先进行登录之后采用auth模式设置权限时user和password都将使用登录的用户名和密码;比如:
   digest:只有经过认证的用户才拥有指定的权限通常组合写法为digest:user:BASE64(SHA1(password)):[permissons]这种形式下的密码必须通过SHA1和BASE64进行双重加密;
   ip:限制只有特定IP的客户端才拥有指定的权限通常组成写法为ip:182.168.0.168:[permissions];
   super:代表超级管理员拥有所有的权限需要修改Zookeeper启动脚本进行配置

  auth是认证数据如果没有则可以是空的字节数组如:

    //world模式认证
    zk.addAuthInfo("world",new byte[0]);
    //auth模式认证
    byte[] auth=Encoding.UTF8.GetBytes("id:pass")
    zk.addAuthInfo("auth",new byte[0]);
    //digest模式认证
    byte[] auth=Encoding.UTF8.GetBytes("加密后的字符串")
    zk.addAuthInfo("digest",new byte[0]);

  ZookeeperNetEx关闭会话使用的是closeAsync方法调用这个方法之后当前连接对象ZooKeeper就不能再访问了

    public Task closeAsync();

  其他常用方法就不介绍了一般时候基本上也用不上

  简单封装

  真实项目中我们连接Zookeeper多数只是为了创建znode节点读取数据等等操作一般不会去设置ACL等权限甚至连认证都可能不会用到为了更好使用ZookeeperNetEx我做了一层简单的封装用以满足常见的CRUD操作同时也让它更符合我们.net开发的一些习惯

using org.apache.zookeeper;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Collections.Concurrent;
using System.Threading;
using System.Text;
using org.apache.zookeeper.data;
using org.apache.utils;
using System.Diagnostics;

namespace AspNetCore.ZookeeperConsole
{

    /// <summary>
    /// Zookeeper辅助类
    /// </summary>
    public class ZookeeperHelper : Watcher, IDisposable
    {
        /// <summary>
        /// Zookeeper路径分隔符
        /// </summary>
        string sep = "/";
        /// <summary>
        /// Zookeeper访问对象
        /// </summary>
        ZooKeeper zookeeper;
        /// <summary>
        /// Zookeeper集群地址
        /// </summary>
        string[] address;
        /// <summary>
        /// 路径监控节点列表
        /// </summary>
        ConcurrentDictionary<string, NodeWatcher> nodeWatchers = new ConcurrentDictionary<string, NodeWatcher>();
        /// <summary>
        /// 节点的默认权限
        /// </summary>
        List<ACL> defaultACL = ZooDefs.Ids.OPEN_ACL_UNSAFE;
        /// <summary>
        /// 默认的监听器
        /// </summary>
        DefaultWatcher defaultWatcher;
        /// <summary>
        /// 监控定时器
        /// </summary>
        System.Timers.Timer timer;
        /// <summary>
        /// 同步锁
        /// </summary>
        AutoResetEvent are = new AutoResetEvent(false);
        /// <summary>
        /// 是否正常关闭
        /// </summary>
        bool isClose = false;


        /// <summary>
        /// 回话超时时间
        /// </summary>
        public int SessionTimeout { get; set; } = 10000;
        /// <summary>
        /// 当前路径
        /// </summary>
        public string CurrentPath { get; private set; }
        /// <summary>
        /// 是否已连接Zookeeper
        /// </summary>
        public bool Connected { get { return zookeeper != null && (zookeeper.getState() == ZooKeeper.States.CONNECTED || zookeeper.getState() == ZooKeeper.States.CONNECTEDREADONLY); } }
        /// <summary>
        /// Zookeeper是否有写的权限
        /// </summary>
        public bool CanWrite { get { return zookeeper != null && zookeeper.getState() == ZooKeeper.States.CONNECTED; } }
        /// <summary>
        /// 数据编码
        /// </summary>
        public Encoding Encoding { get; set; } = Encoding.Default;
        /// <summary>
        /// 释放时发生
        /// </summary>
        public event Action OnDisposing;
        /// <summary>
        /// 在重新连接时发生
        /// </summary>
        public event Action OnConnected;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="address">集群地址(host:prot)</param>
        public ZookeeperHelper(params string[] address) : this(address, "")
        {
        }
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="address">集群地址(host:prot)</param>
        /// <param name="root">初始化根路经</param>
        public ZookeeperHelper(string[] address, string root)
        {
            this.address = address.ToArray();
            CurrentPath = string.IsNullOrWhiteSpace(root) ? sep : root;

            SetLogger(new ZookeeperLogger());

            timer = new System.Timers.Timer();
            timer.Interval = 5000;
            timer.Elapsed += Timer_Elapsed;
        }

        /// <summary>
        /// Zookeeper的日志设置
        /// </summary>
        /// <param name="log"></param>
        public static void SetLogger(ZookeeperLogger log)
        {
            ZooKeeper.LogLevel = log.LogLevel;
            ZooKeeper.LogToFile = log.LogToFile;
            ZooKeeper.LogToTrace = log.LogToTrace;
            ZooKeeper.CustomLogConsumer = log;
        }

        #region 私有方法
        /// <summary>
        /// 定时器
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            timer.Enabled = false;

            if (Monitor.TryEnter(timer))//每次只能一个线程进去
            {
                if (!isClose)
                {
                    //Thread.Sleep(SessionTimeout);
                    if (!Connected)
                    {
                        try
                        {
                            zookeeper?.closeAsync();
                            are.Reset();
                            zookeeper = new ZooKeeper(string.Join(",", address), SessionTimeout, defaultWatcher);
                            if (are.WaitOne(SessionTimeout) && Connected)//会话未超时表示成功连接
                            {
                                //挂载监听器
                                foreach (var key in nodeWatchers.Keys)
                                {
                                    NodeWatcher watcher;
                                    if (nodeWatchers.TryGetValue(key, out watcher))
                                    {
                                        WatchAsync(key, watcher, true).Wait();
                                    }
                                }
                                OnConnected?.Invoke();
                                Monitor.Exit(timer);
                                return;
                            }
                        }
                        catch { }
                        timer.Enabled = true;
                    }
                }

                Monitor.Exit(timer);
            }
        }
        /// <summary>
        /// 检查连接是否正常
        /// </summary>
        private void CheckConnection()
        {
            if (!Connected)
            {
                throw new Exception("fail to connect to the server:" + string.Join(",", address));
            }
        }
        /// <summary>
        /// 检查是否具有写的权限
        /// </summary>
        private void CheckWriten()
        {
            if (!CanWrite)
            {
                throw new Exception("this connection is in readonly mode");
            }
        }
        /// <summary>
        /// 连接数据成Zookeeper的路径格式
        /// </summary>
        /// <param name="paths">路径</param>
        /// <returns>连接后的路径</returns>
        private string Combine(params string[] paths)
        {
            List<string> list = new List<string>();
            foreach (var path in paths)
            {
                var ps = path.Split(new string[] { "/", "\\" }, StringSplitOptions.RemoveEmptyEntries);
                foreach (var p in ps)
                {
                    if (p == ".")//当前路径
                    {
                        continue;
                    }
                    else if (p == "..")//回退
                    {
                        if (list.Count == 0)
                        {
                            throw new ArgumentOutOfRangeException("path is out of range");
                        }

                        list.RemoveAt(list.Count - 1);
                    }
                    else
                    {
                        list.Add(p);
                    }
                }
            }

            return sep + string.Join(sep, list.ToArray());
        }
        /// <summary>
        /// 使用指定的分隔符连接路径
        /// </summary>
        /// <param name="sep">分隔符</param>
        /// <param name="paths">路径</param>
        /// <returns>连接后的路径</returns>
        private string MakePathName(string sep, params string[] paths)
        {
            List<string> list = new List<string>();
            foreach (var path in paths)
            {
                var ps = path.Split(new string[] { "/", "\\" }, StringSplitOptions.RemoveEmptyEntries);
                list.AddRange(ps);
            }

            return string.Join(sep, list.ToArray());
        }
        /// <summary>
        /// 获取绝对路径
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="isAbsolute">路径是否是绝对路径</param>
        /// <returns>绝对路径</returns>
        private string GetAbsolutePath(string path, bool isAbsolute)
        {
            if (!isAbsolute)
            {
                path = Combine(CurrentPath, path);
            }
            else
            {
                path = Combine(path);
            }
            return path;
        }
        #endregion

        /// <summary>
        /// 连接Zookeeper
        /// </summary>
        /// <returns>成功连接返回true,否则返回false</returns>
        public bool Connect()
        {
            if (Connected)
            {
                return true;
            }
            if (zookeeper == null)
            {
                lock (this)
                {
                    defaultWatcher = defaultWatcher ?? new DefaultWatcher(this, are);
                    are.Reset();
                    zookeeper = new ZooKeeper(string.Join(",", address), SessionTimeout, defaultWatcher);
                    are.WaitOne(SessionTimeout);
                }
            }
            if (!Connected)
            {
                return false;
            }
            OnConnected?.Invoke();

            return true;
        }
        /// <summary>
        /// 关闭连接
        /// </summary>
        public void Close()
        {
            isClose = true;
            if (Connected)
            {
                zookeeper.closeAsync().Wait();
            }

        }
        /// <summary>
        /// 监控回调
        /// </summary>
        /// <param name="event">回调事件</param>
        /// <returns>异步</returns>
        public async override Task process(WatchedEvent @event)
        {
            ZookeeperEvent ze = new ZookeeperEvent(@event);

            if (!string.IsNullOrEmpty(ze.Path))
            {
                NodeWatcher watcher;
                if (nodeWatchers.TryGetValue(ze.Path, out watcher))
                {
                    if (watcher != null)
                    {
                        try
                        {
                            watcher.Process(ze);
                        }
                        catch { }
                        await WatchAsync(ze.Path, watcher, true);//重新监控
                    }
                }
            }
        }
        /// <summary>
        /// 修改当前目录地址
        /// </summary>
        /// <param name="path"></param>
        public void ChangeDirectory(string path)
        {
            this.CurrentPath = Combine(path);
        }
        /// <summary>
        /// 切换到相对目录下
        /// </summary>
        /// <param name="path"></param>
        public void Goto(string path)
        {
            this.CurrentPath = Combine(this.CurrentPath, path);
        }
        /// <summary>
        /// 使用认证
        /// </summary>
        /// <param name="scheme">认证类型</param>
        /// <param name="auth">认证数据</param>
        public void Authorize(AuthScheme scheme, string auth = "")
        {
            CheckConnection();
            zookeeper.addAuthInfo(scheme.ToString().ToLower(), Encoding.GetBytes(auth));
        }
        #region 监听与取消
        /// <summary>
        /// 对当前路径添加监控
        /// </summary>
        /// <param name="delegate">监控</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAsync(WatcherEvent @delegate)
        {
            return await WatchAsync(CurrentPath, @delegate, true);
        }
        /// <summary>
        /// 对当前路径添加监控
        /// </summary>
        /// <param name="watcher">监控</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAsync(NodeWatcher watcher)
        {
            return await WatchAsync(CurrentPath, watcher, true);
        }
        /// <summary>
        /// 对指定路径添加监控
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="delegate">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAsync(string path, WatcherEvent @delegate, bool isAbsolutePath = false)
        {
            var array = await WatchManyAsync(new string[] { path }, @delegate, isAbsolutePath);
            return array.FirstOrDefault();
        }
        /// <summary>
        /// 对指定路径添加监控
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="watcher">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAsync(string path, NodeWatcher watcher, bool isAbsolutePath = false)
        {
            var array = await WatchManyAsync(new string[] { path }, watcher, isAbsolutePath);
            return array.FirstOrDefault();
        }
        /// <summary>
        /// 监控多个路径但是不包括子路径
        /// </summary>
        /// <param name="paths">节点路径</param>
        /// <param name="delegate">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool[]> WatchManyAsync(string[] paths, WatcherEvent @delegate, bool isAbsolutePath = false)
        {
            var watcher = new NodeWatcher();
            watcher.AllTypeChanged += @delegate;
            return await WatchManyAsync(paths, watcher, isAbsolutePath);
        }
        /// <summary>
        /// 监控多个路径但是不包括子路径
        /// </summary>
        /// <param name="paths">节点路径</param>
        /// <param name="watcher">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool[]> WatchManyAsync(string[] paths, NodeWatcher watcher, bool isAbsolutePath = false)
        {
            CheckConnection();
            List<bool> list = new List<bool>();
            foreach (var path in paths)
            {
                try
                {
                    var p = GetAbsolutePath(path, isAbsolutePath);
                    if (await zookeeper.existsAsync(p, this) != null)
                    {
                        nodeWatchers[p] = watcher;
                        list.Add(true);
                    }
                    else
                    {
                        nodeWatchers.TryRemove(p, out _);
                        list.Add(false);
                    }
                }
                catch
                {
                    list.Add(false);
                }
            }
            return list.ToArray();
        }
        /// <summary>
        /// 监控当前路径包括子路径
        /// </summary>
        /// <param name="delegate">监控</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAllAsync(WatcherEvent @delegate)
        {
            return await WatchAllAsync(CurrentPath, @delegate, true);
        }
        /// <summary>
        /// 监控当前路径包括子路径
        /// </summary>
        /// <param name="watcher">监控</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAllAsync(NodeWatcher watcher)
        {
            return await WatchAllAsync(CurrentPath, watcher, true);
        }
        /// <summary>
        /// 监控指定路径包括子路径
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="delegate">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAllAsync(string path, WatcherEvent @delegate, bool isAbsolutePath = false)
        {
            var array = await WatchAllAsync(new string[] { path }, @delegate, isAbsolutePath);
            return array.FirstOrDefault();
        }
        /// <summary>
        /// 监控指定路径包括子路径
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="watcher">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool> WatchAllAsync(string path, NodeWatcher watcher, bool isAbsolutePath = false)
        {
            var array = await WatchAllAsync(new string[] { path }, watcher, isAbsolutePath);
            return array.FirstOrDefault();
        }
        /// <summary>
        /// 监控所有路径包括子路径
        /// </summary>
        /// <param name="paths">节点路径</param>
        /// <param name="delegate">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool[]> WatchAllAsync(string[] paths, WatcherEvent @delegate, bool isAbsolutePath = false)
        {
            var watcher = new NodeWatcher();
            watcher.AllTypeChanged += @delegate;
            return await WatchAllAsync(paths, watcher, isAbsolutePath);
        }
        /// <summary>
        /// 监控所有路径包括子路径
        /// </summary>
        /// <param name="paths">节点路径</param>
        /// <param name="watcher">监控</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步true表示成功false表示失败</returns>
        public async Task<bool[]> WatchAllAsync(string[] paths, NodeWatcher watcher, bool isAbsolutePath = false)
        {
            CheckConnection();
            List<bool> list = new List<bool>();
            foreach (var path in paths)
            {
                try
                {
                    var p = GetAbsolutePath(path, isAbsolutePath);
                    if (await zookeeper.existsAsync(p, this) != null)
                    {
                        nodeWatchers[p] = watcher;
                        list.Add(true);

                        var result = await zookeeper.getChildrenAsync(p);
                        await WatchAllAsync(result.Children.Select(c => Combine(p, c)).ToArray(), watcher, true);
                    }
                    else
                    {
                        nodeWatchers.TryRemove(p, out _);
                        list.Add(false);
                    }
                }
                catch
                {
                    list.Add(false);
                }
            }

            return list.ToArray();
        }
        /// <summary>
        /// 取消多个指定路径上的监控
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步</returns>
        public async Task CancelAsync(string path, bool isAbsolutePath = true)
        {
            await CancelAsync(new string[] { path }, isAbsolutePath);
        }
        /// <summary>
        /// 取消多个指定路径上的监控
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>异步</returns>
        public async Task CancelAsync(string[] paths, bool isAbsolutePath = true)
        {
            foreach (var path in paths)
            {
                var p = GetAbsolutePath(path, isAbsolutePath);
                nodeWatchers.TryRemove(p, out _);
                await Task.CompletedTask;
            }
        }
        /// <summary>
        /// 获取指定路径上的监控
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <param name="isAbsolutePath">是否绝对路径</param>
        /// <returns>存在则返回监控对象否则返回null</returns>
        public NodeWatcher GetWatcher(string path, bool isAbsolutePath = true)
        {
            path = GetAbsolutePath(path, isAbsolutePath);
            NodeWatcher watcher;
            if (nodeWatchers.TryGetValue(path, out watcher))
            {
                return watcher;
            }

            return null;
        }
        #endregion
        #region 基本数据操作
        /// <summary>
        /// 当前节点是否存在
        /// </summary>
        /// <returns>存在返回true否则返回false</returns>
        public bool Exists()
        {
            return ExistsAsync().GetAwaiter().GetResult();
        }
        /// <summary>
        /// 指定节点是否存在(相对当前节点)
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <returns>存在返回true否则返回false</returns>
        public bool Exists(string path)
        {
            return ExistsAsync(path).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 指定节点是否存在
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <returns>存在返回true否则返回false</returns>
        public bool ExistsByAbsolutePath(string absolutePath)
        {
            return ExistsByAbsolutePathAsync(absolutePath).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 当前节点是否存在
        /// </summary>
        /// <returns>异步存在返回true否则返回false</returns>
        public async Task<bool> ExistsAsync()
        {
            return await ExistsByAbsolutePathAsync(CurrentPath);
        }
        /// <summary>
        /// 指定节点是否存在(相对当前节点)
        /// </summary>
        /// <param name="path">节点路径</param>
        /// <returns>异步存在返回true否则返回false</returns>
        public async Task<bool> ExistsAsync(string path)
        {
            path = Combine(CurrentPath, path);
            return await ExistsByAbsolutePathAsync(path);
        }
        /// <summary>
        /// 指定节点是否存在
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <returns>异步存在返回true否则返回false</returns>
        public async Task<bool> ExistsByAbsolutePathAsync(string absolutePath)
        {
            absolutePath = Combine(absolutePath);
            return await zookeeper.existsAsync(absolutePath, false) != null;
        }
        /// <summary>
        /// 添加或者修改当前路径上的数据
        /// </summary>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public string SetData(string value, bool persistent = false, bool sequential = false)
        {
            return SetDataAsync(value, persistent, sequential).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 添加或者修改指定相对路径上的数据
        /// </summary>
        /// <param name="path">相对路径</param>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public string SetData(string path, string value, bool persistent = false, bool sequential = false)
        {
            return SetDataAsync(path, value, persistent, sequential).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 添加或者修改指定绝对路径上的数据
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public string SetDataByAbsolutePath(string absolutePath, string value, bool persistent = false, bool sequential = false)
        {
            return SetDataByAbsolutePathAsync(absolutePath, value, persistent, sequential).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 添加或者修改当前路径上的数据
        /// </summary>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public async Task<string> SetDataAsync(string value, bool persistent = false, bool sequential = false)
        {
            return await SetDataByAbsolutePathAsync(CurrentPath, value, persistent, sequential);
        }
        /// <summary>
        /// 添加或者修改指定相对路径上的数据
        /// </summary>
        /// <param name="path">相对路径</param>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public async Task<string> SetDataAsync(string path, string value, bool persistent = false, bool sequential = false)
        {
            path = Combine(CurrentPath, path);
            return await SetDataByAbsolutePathAsync(path, value, persistent, sequential);
        }
        /// <summary>
        /// 添加或者修改指定绝对路径上的数据
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <param name="value">数据</param>
        /// <param name="persistent">是否持久节点</param>
        /// <param name="sequential">是否顺序节点</param>
        /// <returns>znode节点名不包含父节点路径</returns>
        public async Task<string> SetDataByAbsolutePathAsync(string absolutePath, string value, bool persistent = false, bool sequential = false)
        {
            CheckConnection();
            CheckWriten();

            absolutePath = Combine(absolutePath);
            if (await zookeeper.existsAsync(absolutePath, false) == null)
            {
                absolutePath = await zookeeper.createAsync(absolutePath, Encoding.GetBytes(value), defaultACL, persistent ?
                    sequential ? CreateMode.PERSISTENT_SEQUENTIAL : CreateMode.PERSISTENT :
                    sequential ? CreateMode.EPHEMERAL_SEQUENTIAL : CreateMode.EPHEMERAL);
            }
            else
            {
                await zookeeper.setDataAsync(absolutePath, Encoding.GetBytes(value));
            }
            return absolutePath.Split(new string[] { sep }, StringSplitOptions.RemoveEmptyEntries).LastOrDefault();
        }
        /// <summary>
        /// 获取指定相对路径上的数据
        /// </summary>
        /// <param name="path">相对路径</param>
        /// <returns>相对路径上的数据</returns>
        public string GetData(string path)
        {
            return GetDataAsync(path).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 获取指定绝对路径上的数据
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <returns>相对路径上的数据</returns>
        public string GetDataByAbsolutePath(string absolutePath)
        {
            return GetDataByAbsolutePathAsync(absolutePath).GetAwaiter().GetResult();
        }
        /// <summary>
        /// 获取指定相对路径上的数据
        /// </summary>
        /// <param name="path">相对路径</param>
        /// <returns>相对路径上的数据</returns>
        public async Task<string> GetDataAsync(string path)
        {
            path = Combine(CurrentPath, path);
            return await GetDataByAbsolutePathAsync(path);
        }
        /// <summary>
        /// 获取指定绝对路径上的数据
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <returns>绝对路径上的数据</returns>
        public async Task<string> GetDataByAbsolutePathAsync(string absolutePath)
        {
            CheckConnection();
            absolutePath = Combine(absolutePath);
            if (await zookeeper.existsAsync(absolutePath, false) == null)
            {
                return "";
            }
            var data = await zookeeper.getDataAsync(absolutePath, false);
            return Encoding.GetString(data.Data);
        }
        /// <summary>
        /// 获取指定节点及其字节点的所有值使用路径做键返回字典型
        /// </summary>
        /// <param name="sep"></param>
        /// <returns></returns>
        public async Task<IDictionary<string, string>> GetDictionaryAsync(string sep = ":")
        {
            CheckConnection();
            Dictionary<string, string> dict = new Dictionary<string, string>();
            async Task action(string path)
            {
                try
                {
                    var result = await zookeeper.getChildrenAsync(path, false);
                    string name = MakePathName(sep, path);
                    dict[name] = await GetDataByAbsolutePathAsync(path);
                    foreach (var child in result.Children)
                    {
                        var p = Combine(path, child);
                        await action(p);
                    }
                }
                catch (Exception ex)
                {

                }
            }

            await action(CurrentPath);
            return dict;
        }

        /// <summary>
        /// 获取子节点
        /// </summary>
        /// <param name="path">相对路径</param>
        /// <param name="order">是否按时间排序</param>
        /// <returns>子节点数组(节点路径不含父节点路径)</returns>
        public async Task<string[]> GetChildrenAsync(string path, bool order = false)
        {
            path = Combine(CurrentPath, path);
            return await GetChildrenByAbsolutePathAsync(path, order);
        }
        /// <summary>
        /// 获取指定路径绝对路径下的子节点
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        /// <param name="order">是否按时间排序</param>
        /// <returns>子节点数组(节点路径不含父节点路径)</returns>
        public async Task<string[]> GetChildrenByAbsolutePathAsync(string absolutePath, bool order = false)
        {
            var result = await zookeeper.getChildrenAsync(absolutePath, false);
            if (!order)
            {
                return result.Children.ToArray();
            }

            List<(string, long)> list = new List<(string, long)>();
            foreach (var child in result.Children)
            {
                var p = Combine(absolutePath, child);
                var stat = await zookeeper.existsAsync(p, false);
                if (stat != null)
                {
                    list.Add((child, stat.getCtime()));
                }
            }

            return list.OrderBy(l => l.Item2).Select(l => l.Item1).ToArray();
        }
        /// <summary>
        /// 移除当前路径节点
        /// </summary>
        public void Delete()
        {
            DeleteAsync().Wait();
        }
        /// <summary>
        /// 移除相对当前的指定路径节点及子节点
        /// </summary>
        /// <param name="path">相对路径</param>
        public void Delete(string path)
        {
            DeleteAsync(path).Wait();
        }
        /// <summary>
        /// 移除指定绝对路径节点及子节点
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        public void DeleteByAbsolutePath(string absolutePath)
        {
            DeleteByAbsolutePathAsync(absolutePath).Wait();
        }
        /// <summary>
        /// 移除当前路径节点
        /// </summary>
        public async Task DeleteAsync()
        {
            await DeleteByAbsolutePathAsync(CurrentPath);
        }
        /// <summary>
        /// 移除相对当前的指定路径节点及子节点
        /// </summary>
        /// <param name="path">相对路径</param>
        public async Task DeleteAsync(string path)
        {
            path = Combine(CurrentPath, path);
            await DeleteByAbsolutePathAsync(path);
        }
        /// <summary>
        /// 移除指定绝对路径节点及子节点
        /// </summary>
        /// <param name="absolutePath">绝对路径</param>
        public async Task DeleteByAbsolutePathAsync(string absolutePath)
        {
            if (await ExistsByAbsolutePathAsync(absolutePath))
            {
                var children = await GetChildrenByAbsolutePathAsync(absolutePath);
                foreach (var child in children)
                {
                    var path = Combine(absolutePath, child);
                    await DeleteByAbsolutePathAsync(path);
                }

                absolutePath = Combine(absolutePath);
                await zookeeper.deleteAsync(absolutePath);
            }
        }
        #endregion
        /// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose()
        {
            OnDisposing?.Invoke();
            Close();
            timer?.Dispose();
            nodeWatchers?.Clear();
            are?.Dispose();
            GC.Collect();
        }


        /// <summary>
        /// 默认的监听器用于初始化使用
        /// </summary>
        public class DefaultWatcher : Watcher
        {
            /// <summary>
            /// waithandle同步
            /// </summary>
            EventWaitHandle ewh;
            /// <summary>
            /// 辅助类
            /// </summary>
            ZookeeperHelper zookeeperHelper;

            public DefaultWatcher(ZookeeperHelper zookeeperHelper, EventWaitHandle ewh)
            {
                this.ewh = ewh;
                this.zookeeperHelper = zookeeperHelper;
            }
            /// <summary>
            /// 回调
            /// </summary>
            /// <param name="event">监听事件对象</param>
            /// <returns></returns>
            public override Task process(WatchedEvent @event)
            {
                var state = @event.getState();
                if (state == Event.KeeperState.ConnectedReadOnly || state == Event.KeeperState.SyncConnected)//连接时
                {
                    ewh.Set();
                }
                else if ((state == Event.KeeperState.Expired) && !zookeeperHelper.isClose)//回话过期重新建立连接
                {
                    zookeeperHelper.timer.Enabled = true;
                }


                return Task.FromResult(1);
            }
        }
    }
    /// <summary>
    /// 认证类型
    /// </summary>
    public enum AuthScheme
    {
        /// <summary>
        /// 下面只有一个id叫anyoneworld:anyone代表任何人zookeeper中对所有人有权限的结点就是属于world:anyone类型的创建节点的默认权限有唯一的id是anyone授权的时候的模式为 world:anyone:rwadc 表示所有人都对这个节点有rwadc的权限
        /// </summary>
        World = 0,
        /// <summary>
        ///不需要id,只要是通过authentication的user都有权限(zookeeper支持通过kerberos来进行authencation, 也支持username/password形式的authentication)
        /// </summary>
        Auth = 1,
        /// <summary>
        /// 它对应的id为username:BASE64(SHA1(password))它需要先通过加密过的username:password形式的authentication
        /// </summary>
        Digest = 2,
        /// <summary>
        ///它对应的id为客户机的IP地址设置的时候可以设置一个ip段比如ip:192.168.1.0/16
        /// </summary>
        Ip = 3,
        /// <summary>
        /// 在这种scheme情况下对应的id拥有超级权限可以做任何事情(cdrwa)
        /// </summary>
        Super = 4
    }
    /// <summary>
    /// Zookeeper事件数据
    /// </summary>
    public class ZookeeperEvent
    {
        public ZookeeperEvent(WatchedEvent @event)
        {
            switch (@event.getState())
            {
                case Watcher.Event.KeeperState.AuthFailed: State = EventState.AuthFailed; break;
                case Watcher.Event.KeeperState.ConnectedReadOnly: State = EventState.ConnectedReadOnly; break;
                case Watcher.Event.KeeperState.Disconnected: State = EventState.Disconnected; break;
                case Watcher.Event.KeeperState.Expired: State = EventState.Expired; break;
                case Watcher.Event.KeeperState.SyncConnected: State = EventState.SyncConnected; break;
            }

            switch (@event.get_Type())
            {
                case Watcher.Event.EventType.NodeChildrenChanged: Type = EventType.NodeChildrenChanged; break;
                case Watcher.Event.EventType.NodeCreated: Type = EventType.NodeCreated; break;
                case Watcher.Event.EventType.NodeDataChanged: Type = EventType.NodeDataChanged; break;
                case Watcher.Event.EventType.NodeDeleted: Type = EventType.NodeDeleted; break;
                case Watcher.Event.EventType.None: Type = EventType.None; break;
            }

            Path = @event.getPath();
        }
        /// <summary>
        /// 当前连接状态
        /// </summary>
        public EventState State { get; private set; }
        /// <summary>
        /// 事件类型
        /// </summary>
        public EventType Type { get; private set; }
        /// <summary>
        /// 事件路径
        /// </summary>
        public string Path { get; private set; }

        /// <summary>
        /// 连接状态
        /// </summary>
        public enum EventState
        {/// <summary>
         /// 超时
         /// </summary>
            Expired = -112,
            /// <summary>
            /// 连接已断开
            /// </summary>
            Disconnected = 0,
            /// <summary>
            /// 已建立连接
            /// </summary>
            SyncConnected = 3,
            /// <summary>
            /// 认证失败
            /// </summary>
            AuthFailed = 4,
            /// <summary>
            /// 已建立连接但是只支持只读模式
            /// </summary>
            ConnectedReadOnly = 5
        }
        /// <summary>
        /// 时间类型
        /// </summary>
        public enum EventType
        {
            /// <summary>
            /// 空类型如:建立连接时
            /// </summary>
            None = -1,
            /// <summary>
            /// 节点创建时
            /// </summary>
            NodeCreated = 1,
            /// <summary>
            /// 节点删除时
            /// </summary>
            NodeDeleted = 2,
            /// <summary>
            /// 节点数据改变时
            /// </summary>
            NodeDataChanged = 3,
            /// <summary>
            /// 节点增加子节点时
            /// </summary>
            NodeChildrenChanged = 4
        }
    }
    /// <summary>
    /// 监控对象
    /// </summary>
    public class NodeWatcher
    {
        /// <summary>
        /// 节点创建时调用事件
        /// </summary>
        public event WatcherEvent NodeCreated;
        /// <summary>
        /// 节点删除时调用事件
        /// </summary>
        public event WatcherEvent NodeDeleted;
        /// <summary>
        /// 节点数据改变时调用事件
        /// </summary>
        public event WatcherEvent NodeDataChanged;
        /// <summary>
        /// 节点增加子节点时调用事件
        /// </summary>
        public event WatcherEvent NodeChildrenChanged;
        /// <summary>
        /// 不区分类型所有的类型都会调用
        /// </summary>
        public event WatcherEvent AllTypeChanged;

        /// <summary>
        /// 触发执行事件
        /// </summary>
        /// <param name="event"></param>
        public void Process(ZookeeperEvent @event)
        {
            try
            {
                switch (@event.Type)
                {
                    case ZookeeperEvent.EventType.NodeChildrenChanged:
                        NodeChildrenChanged?.Invoke(@event);
                        break;
                    case ZookeeperEvent.EventType.NodeCreated:
                        NodeCreated?.Invoke(@event);
                        break;
                    case ZookeeperEvent.EventType.NodeDeleted:
                        NodeDeleted?.Invoke(@event);
                        break;
                    case ZookeeperEvent.EventType.NodeDataChanged:
                        NodeDataChanged?.Invoke(@event);
                        break;
                }

                AllTypeChanged?.Invoke(@event);
            }
            catch { }
        }
    }
    /// <summary>
    /// 监控事件委托
    /// </summary>
    /// <param name="event"></param>
    public delegate void WatcherEvent(ZookeeperEvent @event);
    /// <summary>
    /// Zookeeper默认日志记录
    /// </summary>
    public class ZookeeperLogger : ILogConsumer
    {
        /// <summary>
        /// 是否记录日志到文件
        /// </summary>
        public bool LogToFile { get; set; } = false;
        /// <summary>
        /// 是否记录堆栈信息
        /// </summary>
        public bool LogToTrace { get; set; } = true;
        /// <summary>
        /// 日志级别
        /// </summary>
        public TraceLevel LogLevel { get; set; } = TraceLevel.Warning;

        /// <summary>
        /// 日志记录
        /// </summary>
        /// <param name="severity"></param>
        /// <param name="className"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public virtual void Log(TraceLevel severity, string className, string message, Exception exception)
        {
            Console.WriteLine(string.Format("Level:{0}  className:{1}   message:{2}", severity, className, message));
            Console.WriteLine(exception.StackTrace);
        }
    }
}

  简单的使用例子: 

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace AspNetCore.ZookeeperConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            //Zookeeper连接字符串采用host:port格式多个地址之间使用逗号(,)隔开
            string[] address = new string[] { "192.168.209.133:2181", "192.168.209.133:2181", "192.168.209.133:2181" };
            //会话超时时间,单位毫秒
            int sessionTimeOut = 10000;

            ZookeeperHelper zookeeperHelper = new ZookeeperHelper(address, "/");
            zookeeperHelper.SessionTimeout = sessionTimeOut;
            zookeeperHelper.Connect();//发起连接
            while (!zookeeperHelper.Connected)
            {
                Thread.Sleep(1000); //停一秒等待连接完成
            }

            //创建znode节点
            {
                zookeeperHelper.SetData("/mynode", "hello world", true, false);
                Console.WriteLine("完成创建节点");
            }

            //节点是否存在
            {
                var exists = zookeeperHelper.Exists("/mynode");
                Console.WriteLine("节点是否存在:" + exists);
            }

            //添加监听器
            {
                zookeeperHelper.WatchAsync("/mynode", (e) =>
                {
                    Console.WriteLine($"recieve: Path-{e.Path}     State-{e.State}    Type-{e.Type}");
                }).Wait();
            }

            //获取节点数据
            {                
                var value = zookeeperHelper.GetData("/mynode");
                Console.WriteLine("完成读取节点:" + value);
            }

            //设置节点数据
            {
                zookeeperHelper.SetData("/mynode", "hello world again");
                Console.WriteLine("设置节点数据");
            }

            //重新获取节点数据
            {
                var value = zookeeperHelper.GetData("/mynode");
                Console.WriteLine("重新获取节点数据:" + value);
            }

            //移除节点
            {
                zookeeperHelper.Delete("/mynode");
                Console.WriteLine("移除节点");
            }

            Console.WriteLine("完成");
            Console.ReadKey();

        }
    }
}

  执行结果: 


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