zookeeper-javaAPI

权限控制模式

schema：授权对象

ip     : 192.168.1.1

Digest  : username:password

world  : 开放式的权限控制模式，数据节点的访问权限对所有用户开放。 world:anyone

super  ：超级用户，可以对zookeeper上的数据节点进行操作

连接状态

KeeperStat.Expired  在一定时间内客户端没有收到服务器的通知， 则认为当前的会话已经过期了。

KeeperStat.Disconnected  断开连接的状态

KeeperStat.SyncConnected  客户端和服务器端在某一个节点上建立连接，并且完成一次version、zxid同步

KeeperStat.authFailed  授权失败

事件类型

NodeCreated  当节点被创建的时候，触发

NodeChildrenChanged  表示子节点被创建、被删除、子节点数据发生变化

NodeDataChanged    节点数据发生变化

NodeDeleted        节点被删除

None   客户端和服务器端连接状态发生变化的时候，事件类型就是None

curator

Curator本身是Netflix公司开源的zookeeper客户端；

curator提供了各种应用场景的实现封装

curator-framework  提供了fluent风格api

curator-replice     提供了实现封装 

master/leader选举 

分布式锁（读锁、写锁）

分布式队列

curator连接的重试策略

ExponentialBackoffRetry()  衰减重试 

RetryNTimes 指定最大重试次数

RetryOneTime 仅重试一次

RetryUnitilElapsed 一直重试知道规定的时间

 <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.8</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>

package com.example.springbootdemo.zookeeper;

import org.apache.zookeeper.*;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Id;
import org.apache.zookeeper.data.Stat;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;


public class ApiOperatorDemo implements Watcher{
//    private final static String CONNECTSTRING="192.168.156.207:2181,192.168.11.134:2181," +
//            "192.168.11.135:2181,192.168.11.136:2181";
private final static String CONNECTSTRING="192.168.156.207:2181";

    private static CountDownLatch countDownLatch=new CountDownLatch(1);
    private static ZooKeeper zookeeper;
    private static Stat stat=new Stat();
    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
        zookeeper=new ZooKeeper(CONNECTSTRING, 5000, new ApiOperatorDemo());
        countDownLatch.await();
//        ACL acl=new ACL(ZooDefs.Perms.ALL,new Id("ip","192.168.156.207"));
//        List<ACL> acls=new ArrayList<>();
//        acls.add(acl);
//        zookeeper.create("/authTest","111".getBytes(),acls,CreateMode.PERSISTENT);
        zookeeper.create("/authTest1","111".getBytes(),ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.EPHEMERAL);
        byte[] bytes = zookeeper.getData("/authTest1",true,new Stat());
        System.out.println(zookeeper.getState()); // CONNECTED
        System.out.println(new String(bytes,"utf-8")); // 111

        //创建节点
        String result=zookeeper.create("/node1","123".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zookeeper.getData("/node1",new ApiOperatorDemo(),stat); //增加一个
        System.out.println("创建成功："+result);

        //修改数据
        zookeeper.setData("/node1","yin123".getBytes(),-1);
        Thread.sleep(2000);
        //修改数据
        zookeeper.setData("/node1","yin234".getBytes(),-1);
        Thread.sleep(2000);

       //* //删除节点
        zookeeper.delete("/node1",-1);
        Thread.sleep(2000);

        //创建节点和子节点
        String path="/node11";

        zookeeper.create(path,"123".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
        TimeUnit.SECONDS.sleep(1);

        Stat stat=zookeeper.exists(path+"/node1",true);
        if(stat==null){//表示节点不存在
            zookeeper.create(path+"/node1","123".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
            TimeUnit.SECONDS.sleep(1);
        }
        //修改子路径
        zookeeper.setData(path+"/node1","mic123".getBytes(),-1);
        TimeUnit.SECONDS.sleep(1);


        //获取指定节点下的子节点
       /* List<String> childrens=zookeeper.getChildren("/node",true);
        System.out.println(childrens);*/


    }

    public void process(WatchedEvent watchedEvent) {
        //如果当前的连接状态是连接成功的，那么通过计数器去控制
        if(watchedEvent.getState()==Event.KeeperState.SyncConnected){
            if(Event.EventType.None==watchedEvent.getType()&&null==watchedEvent.getPath()){
                countDownLatch.countDown();
                System.out.println(watchedEvent.getState()+"-->"+watchedEvent.getType());
            }else if(watchedEvent.getType()== Event.EventType.NodeDataChanged){
                try {
                    System.out.println("数据变更触发路径："+watchedEvent.getPath()+"->改变后的值："+
                            zookeeper.getData(watchedEvent.getPath(),true,stat));
                } catch (KeeperException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }else if(watchedEvent.getType()== Event.EventType.NodeChildrenChanged){//子节点的数据变化会触发
                try {
                    System.out.println("子节点数据变更路径："+watchedEvent.getPath()+"->节点的值："+
                            zookeeper.getData(watchedEvent.getPath(),true,stat));
                } catch (KeeperException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }else if(watchedEvent.getType()== Event.EventType.NodeCreated){//创建子节点的时候会触发
                try {
                    System.out.println("节点创建路径："+watchedEvent.getPath()+"->节点的值："+
                            zookeeper.getData(watchedEvent.getPath(),true,stat));
                } catch (KeeperException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }else if(watchedEvent.getType()== Event.EventType.NodeDeleted){//子节点删除会触发
                System.out.println("节点删除路径："+watchedEvent.getPath());
            }
            System.out.println(watchedEvent.getType());
        }

    }
}

package com.example.springbootdemo.zookeeper;

import org.apache.zookeeper.*;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Id;
import org.apache.zookeeper.data.Stat;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;


public class AuthControlDemo implements Watcher{
    private final static String CONNECTSTRING="192.168.156.207:2181";
    private static CountDownLatch countDownLatch=new CountDownLatch(1);
    private static CountDownLatch countDownLatch2=new CountDownLatch(1);

    private static ZooKeeper zookeeper;
    private static Stat stat=new Stat();
    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
//        zookeeper=new ZooKeeper(CONNECTSTRING, 5000, new AuthControlDemo());
//        countDownLatch.await();
//
//        ACL acl=new ACL(ZooDefs.Perms.CREATE, new Id("digest","root:root"));
//        ACL acl2=new ACL(ZooDefs.Perms.CREATE, new Id("ip","192.168.1.1"));
//
//        List<ACL> acls=new ArrayList<>();
//        acls.add(acl);
//        acls.add(acl2);
//        zookeeper.create("/auth11","123".getBytes(),acls,CreateMode.PERSISTENT);
//        zookeeper.addAuthInfo("digest","root:root".getBytes());
//        zookeeper.create("/auth1","123".getBytes(), ZooDefs.Ids.CREATOR_ALL_ACL, CreateMode.PERSISTENT);
//        zookeeper.create("/auth1/auth1-1","123".getBytes(), ZooDefs.Ids.CREATOR_ALL_ACL,CreateMode.EPHEMERAL);


        ZooKeeper zooKeeper1=new ZooKeeper(CONNECTSTRING, 5000, new AuthControlDemo());
        countDownLatch.await();
 //      System.out.println(zooKeeper1.getData("/auth11",new AuthControlDemo(),null));
       zooKeeper1.delete("/auth11",-1);

        // acl (create /delete /admin /read/write)
        //权限模式： ip/Digest（username:password）/world/super

    }
    public void process(WatchedEvent watchedEvent) {
        //如果当前的连接状态是连接成功的，那么通过计数器去控制
        if(watchedEvent.getState()==Event.KeeperState.SyncConnected){
            if(Event.EventType.None==watchedEvent.getType()&&null==watchedEvent.getPath()){
                countDownLatch.countDown();
                System.out.println(watchedEvent.getState()+"-->"+watchedEvent.getType());
            }
        }

    }
}

ZkClient:

package com.example.springbootdemo.zookeeper.zkclient;

import org.I0Itec.zkclient.ZkClient;


public class SessionDemo {

    private final static String CONNECTSTRING="192.168.156.207:2181";

    public static void main(String[] args) {
        ZkClient zkClient=new ZkClient(CONNECTSTRING,4000);

        System.out.println(zkClient+" - > success");
    }
}

package com.example.springbootdemo.zookeeper.zkclient;

import org.I0Itec.zkclient.IZkChildListener;
import org.I0Itec.zkclient.IZkDataListener;
import org.I0Itec.zkclient.ZkClient;

import java.util.List;
import java.util.concurrent.TimeUnit;


public class ZkClientApiOperatorDemo {

    private final static String CONNECTSTRING="192.168.156.207:2181";

    private static ZkClient  getInstance(){
        return new ZkClient(CONNECTSTRING,10000);
    }

    public static void main(String[] args) throws InterruptedException {
        ZkClient zkClient=getInstance();
        //zkclient 提供递归创建父节点的功能
//        zkClient.createPersistent("/zkclient/zkclient2/zkclient2-2/zkclient1-1-1",true);
//        System.out.println("success");

        //删除节点
//        zkClient.deleteRecursive("/zkclient");


        //获取子节点
//        List<String> list=zkClient.getChildren("/zkclient");
//        System.out.println(list);

        //watcher

        zkClient.subscribeDataChanges("/node", new IZkDataListener() {
            @Override
            public void handleDataChange(String s, Object o) throws Exception {
                System.out.println("节点名称："+s+"->节点修改后的值"+o);
            }

            @Override
            public void handleDataDeleted(String s) throws Exception {

            }
        });

        zkClient.writeData("/node","node");
        TimeUnit.SECONDS.sleep(2);
//
//        zkClient.subscribeChildChanges("/node", new IZkChildListener() {
//            @Override
//            public void handleChildChange(String s, List<String> list) throws Exception {
//
//            }
//        });

    }
}

<dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.11.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.11.0</version>
        </dependency>