import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.List;

public class CuratorTest {


    private CuratorFramework client;

    /**
     * 建立连接
     */
    @Before
    public void testConnect() {

        //重试策略
        RetryPolicy retryPolicy = new ExponentialBackoffRetry(3000, 10);
        //2.第二种方式
        //CuratorFrameworkFactory.builder();
        client = CuratorFrameworkFactory.builder()
                .connectString("192.168.196.101:2181,192.168.196.101:2182,192.168.196.101:2183")
                .sessionTimeoutMs(60 * 1000)
                .connectionTimeoutMs(15 * 1000)
                .retryPolicy(retryPolicy)
//                .namespace("itheima")
                .build();

        //开启连接
        client.start();

    }

    @Test
    public void testCreate() throws Exception {
        //1. 基本创建
        //如果创建节点，没有指定数据，则默认将当前客户端的ip作为数据存储
        String path = client.create().forPath("/app1");
        System.out.println(path);

    }

    @Test
    public void testCreate2() throws Exception {
        //2. 创建节点 带有数据
        //如果创建节点，没有指定数据，则默认将当前客户端的ip作为数据存储
        String path = client.create().forPath("/app2", "hehe".getBytes());
        System.out.println(path);

    }

    @Test
    public void testCreate3() throws Exception {
        //3. 设置节点的类型
        //默认类型：持久化
        String path = client.create().withMode(CreateMode.EPHEMERAL).forPath("/app3");
        System.out.println(path);
    }

    @Test
    public void testCreate4() throws Exception {
        //4. 创建多级节点  /app1/p1
        //creatingParentsIfNeeded():如果父节点不存在，则创建父节点
        String path = client.create().creatingParentsIfNeeded().forPath("/app4/p1");
        System.out.println(path);
    }

    /**
     * 查询节点：
     * 1. 查询数据：get: getData().forPath()
     * 2. 查询子节点： ls: getChildren().forPath()
     * 3. 查询节点状态信息：ls -s:getData().storingStatIn(状态对象).forPath()
     */

    @Test
    public void testGet1() throws Exception {
        //1. 查询数据：get
        byte[] data = client.getData().forPath("/app1");
        System.out.println(new String(data));
    }

    @Test
    public void testGet2() throws Exception {
        // 2. 查询子节点： ls
        List<String> path = client.getChildren().forPath("/");

        System.out.println(path);
    }

    @Test
    public void testGet3() throws Exception {
        Stat status = new Stat();
        System.out.println(status);
        //3. 查询节点状态信息：ls -s
        client.getData().storingStatIn(status).forPath("/app1");
        System.out.println(status);

    }

    @Test
    public void testSet() throws Exception {
        client.setData().forPath("/app1", "itcast".getBytes());
    }
    @Test
    public void testSetForVersion() throws Exception {
        Stat status = new Stat();
        //3. 查询节点状态信息：ls -s
        client.getData().storingStatIn(status).forPath("/app1");
        int version = status.getVersion();//查询出来的 3
        System.out.println(version);
        client.setData().withVersion(version).forPath("/app1", "hehe".getBytes());
    }

    /**
     * 删除节点： delete deleteall
     * 1. 删除单个节点:delete().forPath("/app1");
     * 2. 删除带有子节点的节点:delete().deletingChildrenIfNeeded().forPath("/app1");
     * 3. 必须成功的删除:为了防止网络抖动。本质就是重试。  client.delete().guaranteed().forPath("/app2");
     * 4. 回调：inBackground
     * @throws Exception
     */
    @Test
    public void testDelete() throws Exception {
        // 1. 删除单个节点
        client.delete().forPath("/app1");
    }
    @Test
    public void testDelete2() throws Exception {
        //2. 删除带有子节点的节点
        client.delete().deletingChildrenIfNeeded().forPath("/app4");
    }
    @Test
    public void testDelete3() throws Exception {
        //3. 必须成功的删除
        client.delete().guaranteed().forPath("/app2");
    }
    @Test
    public void testDelete4() throws Exception {
        //4. 回调
        client.delete().guaranteed().inBackground(new BackgroundCallback(){
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                System.out.println("我被删除了~");
                System.out.println(event);
            }
        }).forPath("/app1");
    }
    @After
    public void close() {
        if (client != null) {
            client.close();
        }
    }
}

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.framework.recipes.cache.*;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.List;

public class CuratorWatcherTest {

    private CuratorFramework client;
    @Before
    public void testConnect() {
        //重试策略
        RetryPolicy retryPolicy = new ExponentialBackoffRetry(3000, 10);
        //2.第二种方式
        //CuratorFrameworkFactory.builder();
        client = CuratorFrameworkFactory.builder()
                .connectString("192.168.149.135:2181")
                .sessionTimeoutMs(60 * 1000)
                .connectionTimeoutMs(15 * 1000)
                .retryPolicy(retryPolicy)
//                .namespace("itheima")
                .build();

        //开启连接
        client.start();

    }

    @After
    public void close() {
        if (client != null) {
            client.close();
        }
    }

    /**
     * 演示 NodeCache：给指定一个节点注册监听器
     */
    @Test
    public void testNodeCache() throws Exception {
        //1. 创建NodeCache对象
        final NodeCache nodeCache = new NodeCache(client,"/app1");
        //2. 注册监听
        nodeCache.getListenable().addListener(new NodeCacheListener() {
            @Override
            public void nodeChanged() throws Exception {
                System.out.println("节点变化了~");

                //获取修改节点后的数据
                byte[] data = nodeCache.getCurrentData().getData();
                System.out.println(new String(data));
            }
        });
        //3. 开启监听.如果设置为true，则开启监听是，加载缓冲数据
        nodeCache.start(true);
        while (true){

        }
    }
    /**
     * 演示 PathChildrenCache：监听某个节点的所有子节点们
     */

    @Test
    public void testPathChildrenCache() throws Exception {
        //1.创建监听对象
        PathChildrenCache pathChildrenCache = new PathChildrenCache(client,"/app2",true);

        //2. 绑定监听器
        pathChildrenCache.getListenable().addListener(new PathChildrenCacheListener() {
            @Override
            public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
                System.out.println("子节点变化了~");
                System.out.println(event);
                //监听子节点的数据变更，并且拿到变更后的数据
                //1.获取类型
                PathChildrenCacheEvent.Type type = event.getType();
                //2.判断类型是否是update
                if(type.equals(PathChildrenCacheEvent.Type.CHILD_UPDATED)){
                    System.out.println("数据变了！！！");
                    byte[] data = event.getData().getData();
                    System.out.println(new String(data));
                }
            }
        });
        //3. 开启
        pathChildrenCache.start();

        while (true){

        }
    }

    /**
     * 演示 TreeCache：监听某个节点自己和所有子节点们
     */
    @Test
    public void testTreeCache() throws Exception {
        //1. 创建监听器
        TreeCache treeCache = new TreeCache(client,"/app2");

        //2. 注册监听
        treeCache.getListenable().addListener(new TreeCacheListener() {
            @Override
            public void childEvent(CuratorFramework client, TreeCacheEvent event) throws Exception {
                System.out.println("节点变化了");
                System.out.println(event);
            }
        });

        //3. 开启
        treeCache.start();

        while (true){

        }
    }

}