C#如何连接使用Zookeeper

　　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anyone，world: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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