ZooKeeper Distributed lock
- https://segmentfault.com/a/1190000016351095
- http://www.dengshenyu.com/java/分布式系统/2017/10/23/zookeeper-distributed-lock.html
Test
Enumerable.Range(1, 5).ToList().ForEach(i =>
{
Task.Run(() =>
{
var lockHelper = new ZooKeeperLockHelper("localhost:5181");
lockHelper.OnAcquireLock += (id) =>
{
var random = new Random().Next(10);
Log.Debug("NodeId {@id} executing.....Sleep {@ms} ms", id, random * 1000);
Thread.Sleep(random * 1000);
Log.Debug("NodeId {@id} executing success", id);
return Task.CompletedTask;
};
lockHelper.AcquireLock();
});
});
using org.apache.zookeeper;
using Serilog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
namespace RedisDemo
{
public class ZooKeeperLockHelper : Watcher, IDisposable
{
#region event
public event Func<long, Task> OnAcquireLock;
#endregion
private bool _disposed;
private ZooKeeper _zooKeeper;
private Event.KeeperState _currentState;
private AutoResetEvent _notifyEvent = new AutoResetEvent(false);
private string _connectionString;
private bool _hasAcquireLock;
private string _lockPath;
private long _currentNodeId;
private static readonly string DEFAULT_PATH = "/zk";
private static readonly string NODE_NAME = "node-";
public ZooKeeperLockHelper(string connectionString)
{
_connectionString = connectionString;
this.Initialize(_connectionString, TimeSpan.FromSeconds(60));
}
public void AcquireLock(string path = "")
{
if (this._hasAcquireLock)
{
FireAcquireLock(this._currentNodeId).Wait();
return;
}
if (!WaitConnected(TimeSpan.FromSeconds(10)))
{
throw new Exception($"{_connectionString} Cannot Connect ZooKeeper");
}
_lockPath = path;
if (string.IsNullOrEmpty(_lockPath))
{
_lockPath = DEFAULT_PATH;
}
var nodePath = _lockPath + "/" + NODE_NAME;
var spath = this._zooKeeper.createAsync(
nodePath, Encoding.UTF8.GetBytes("data"),
ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL_SEQUENTIAL).Result;
this._currentNodeId = ParseNodeId(spath);
var reuslt = this._zooKeeper.getChildrenAsync(_lockPath, true).GetAwaiter().GetResult();
Log.Debug("#-> Begin Acquire Lock CurrentId {@id}", _currentNodeId);
if (this.IsMinNodeId(reuslt, this._currentNodeId))
{
lock (this)
{
if (!this._hasAcquireLock)
{
Log.Debug("NodeId {@id} Direct Acquire Lock", _currentNodeId);
this._hasAcquireLock = true;
this.FireAcquireLock(this._currentNodeId).Wait();
}
}
}
}
protected bool IsMinNodeId(ChildrenResult childrenResult, long nodeId)
{
if (nodeId == 0 || childrenResult == null || childrenResult.Children.Count == 0)
return false;
var nodeIds = new List<long>();
foreach (var item in childrenResult.Children)
{
nodeIds.Add(ParseNodeId(item));
}
if (nodeIds.Count > 0 && nodeIds.Min() == nodeId)
{
return true;
}
return false;
}
protected long ParseNodeId(string path)
{
var m = Regex.Match(path, "(\\d+)");
if (m.Success)
{
return long.Parse(m.Groups[0].Value);
}
return 0L;
}
protected void Initialize(String connectionString, TimeSpan sessionTimeout)
{
this._zooKeeper = new ZooKeeper(connectionString, (int)sessionTimeout.TotalMilliseconds, this);
}
public Task FireAcquireLock(long id)
{
this.OnAcquireLock(id).Wait();
this.CloseConnection();
Log.Debug("NodeId {@id} Close ZooKeeper Success", id);
return Task.CompletedTask;
}
public bool WaitConnected(TimeSpan timeout)
{
var continueWait = false;
while (this._currentState != Event.KeeperState.SyncConnected)
{
continueWait = _notifyEvent.WaitOne(timeout);
if (!continueWait)
{
return false;
}
}
return true;
}
protected void CloseConnection()
{
if (_disposed)
{
return;
}
_disposed = true;
if (_zooKeeper != null)
{
try
{
this._zooKeeper.closeAsync().ConfigureAwait(false).GetAwaiter().GetResult();
}
catch { }
}
}
#region Watcher Impl
public override Task process(WatchedEvent @event)
{
if (@event.getState() == Event.KeeperState.SyncConnected)
{
if (String.IsNullOrEmpty(@event.getPath()))
{
this._currentState = @event.getState();
this._notifyEvent.Set();
}
var path = @event.getPath();
if (!string.IsNullOrEmpty(path))
{
if (path.Equals(this._lockPath))
{
Log.Debug("NodeId {@id} Start Watcher Callback", this._currentNodeId);
if (this._hasAcquireLock)
{
Log.Debug("NodeId {@id} Has Acquire Lock return", this._currentNodeId);
return Task.CompletedTask;
}
Task.Run(() =>
{
var childrenResult = _zooKeeper.getChildrenAsync(this._lockPath, this).Result;
if (IsMinNodeId(childrenResult, this._currentNodeId))
{
lock (this)
{
if (!this._hasAcquireLock)
{
Log.Debug("NodeId {@id} Acquire Lock", this._currentNodeId);
this._hasAcquireLock = true;
this.FireAcquireLock(this._currentNodeId).Wait();
}
}
}
});
//_zooKeeper.getChildrenAsync(_lockPath, this);
}
}
}
return Task.CompletedTask;
}
public void Dispose()
{
this.CloseConnection();
}
#endregion
}
}
ZooKeeper Distributed lock的更多相关文章
- distributed lock manager (DLM)(分布式管理锁)
A distributed lock manager (DLM) provides distributed software applications with a means to synchron ...
- Redis Distributed lock
using StackExchange.Redis; using System; using System.Collections.Generic; using System.Linq; using ...
- 基于ZooKeeper的分布式锁和队列
在分布式系统中,往往需要一些分布式同步原语来做一些协同工作,上一篇文章介绍了Zookeeper的基本原理,本文介绍下基于Zookeeper的Lock和Queue的实现,主要代码都来自Zookeeper ...
- zookeeper实现分布式锁服务
A distributed lock base on zookeeper. zookeeper是hadoop下面的一个子项目, 用来协调跟hadoop相关的一些分布式的框架, 如hadoop, hiv ...
- How to do distributed locking
How to do distributed locking 怎样做可靠的分布式锁,Redlock 真的可行么? 本文是对 Martin Kleppmann 的文章 How to do distribu ...
- 基于Apache Curator框架的ZooKeeper使用详解
一 简介 Apache Curator是一个比较完善的ZooKeeper客户端框架,通过封装的一套高级API 简化了ZooKeeper的操作.通过查看官方文档,可以发现Curator主要解决了三类问题 ...
- 基于zookeeper实现的分布式锁
基于zookeeper实现的分布式锁 2011-01-27 • 技术 • 7 条评论 • jiacheo •14,941 阅读 A distributed lock base on zookeeper ...
- zookeeper生产最广泛使用java客户端curator介绍及其它客户端比较
关于zookeeper的原理解析,可以参见zookeeper核心原理详解,本文所述大多数实践基于对zookeeper原理的首先理解. Curator是Netflix公司开源的一个Zookeeper客户 ...
- 01 . 消息队列之(Kafka+ZooKeeper)
消息队列简介 什么是消息队列? 首先,我们来看看什么是消息队列,维基百科里的解释翻译过来如下: 队列提供了一种异步通信协议,这意味着消息的发送者和接受者不需要同时与消息保持联系,发送者发送的消息会存储 ...
随机推荐
- ADB之安装APK
一.下载安装adb工具 下载安装,cmd测试是否成功 二.连接设备 1.手机打开USB测试 2.测试连接 三.安装应用 adb -s [设备编号] install [apk的完整路径]
- 剑指offer-面试题11-旋转数组的最小数字-二分法
/* 题目: 把一个数组最开始的若干个元素搬到数组末尾,我们称之为数组的旋转. 输入一个递增排序的数组的旋转,输出旋转数组中的最小元素. */ /* 思路: 采用二分的方法,旋转数组实质上是上左半部分 ...
- LeetCode 160. 相交链表 (找出两个链表的公共结点)
题目链接:https://leetcode-cn.com/problems/intersection-of-two-linked-lists/ 编写一个程序,找到两个单链表相交的起始节点. 如下面的两 ...
- Python面向对象三大特性(封装、继承、多态)
封装 类中把某些属性和方法隐藏起来,或者定义为私有,只在类的内部使用,在类的外部无法访问,或者留下少量的接口(函数)供外部访问:从上一篇文章中的私有属性与私有方法中的代码体现了该特性. class m ...
- UI中class的用法:
easyui的引入:<link rel="stylesheet" type="text/css" href="easyui/themes/def ...
- IDAE打包WEB项目 WAR Eclipse转IDEA项目
接下来这里只说WEB项目打包,相信大多数都是用的WEB项目吧,关于打包WAR,真的很头痛,网上说的试了好好次都不行. 后来懂了之后,真的很简单好么,分享给大家 不要多走弯路了. 注意: 如果你 ...
- 关于npm 的注意事项
npm install 之后 会生成package-lock.json 文件 ,注意这个文件不能删除,否则每次 npm i 之后,node_modules都装的是最新的,会出现意想不到的问题.
- R语言函数化编程笔记2
R语言函数化编程笔记2 我学过很多的编程语言,可以我写的代码很啰嗦,一定是我太懒了.或许是基础不牢地动山摇 1.为什么要学函数 函数可以简化编程语言,减少重复代码或者说面向对象的作用 2.函数 2.1 ...
- smarty循环item命名规范
使用smarty循环渲染数据时第二次循环item复制命名不规范 item=data 后面代码使用data会与后台返回数据冲突 {%foreach from=$data.bind_data key=ke ...
- 微信小程序调试页面的坑
使用微信开发者工具切新的页面保存刷新无法在左侧直接预览必须在app.json文件配置页面(填写路径但是不用写后缀名),并且把想要预览的页面放在第一个位置.