Curator 基本API

package bjsxt.curator.base;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.curator.RetryLoop;
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.ZooKeeper.States;
import org.apache.zookeeper.data.Stat;

public class CuratorBase {

	/** zookeeper地址 */
//	static final String CONNECT_ADDR = "192.168.1.171:2181,192.168.1.172:2181,192.168.1.173:2181";
	static final String CONNECT_ADDR = "115.159.41.97:2181";
	/** session超时时间 */
	static final int SESSION_OUTTIME = 5000;//ms 

	public static void main(String[] args) throws Exception {

//		RetryLoop  无限重试  一直重试不好,

		//1 重试策略：初试时间为1s 重试10次
		RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 10);
		//2 通过工厂创建连接
		CuratorFramework cf = CuratorFrameworkFactory.builder()
					.connectString(CONNECT_ADDR)
					.sessionTimeoutMs(SESSION_OUTTIME)
					.retryPolicy(retryPolicy)
//					.namespace("super")
					.build();
		//3 开启连接
		cf.start();

//		System.out.println(States.CONNECTED);
//		System.out.println(cf.getState());

		// 新加、删除

		//4 建立节点 指定节点类型（不加withMode默认为持久类型节点）、路径、数据内容
		cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath("/super/c1","c1内容".getBytes());
		//5 删除节点
		cf.delete().guaranteed().deletingChildrenIfNeeded().forPath("/super");

		// 读取、修改

		//创建节点
		cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath("/super/c1","c1内容".getBytes());
		cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath("/super/c2","c2内容".getBytes());

		//读取节点
		String ret1 = new String(cf.getData().forPath("/super/c2"));
		System.out.println(ret1);

		//修改节点
		cf.setData().forPath("/super/c2", "修改c2内容".getBytes());
		String ret2 = new String(cf.getData().forPath("/super/c2"));
		System.out.println(ret2);	

		// 绑定回调函数

		ExecutorService pool = Executors.newCachedThreadPool();

		cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT)
		.inBackground(new BackgroundCallback() {
			@Override
			public void processResult(CuratorFramework cf, CuratorEvent ce) throws Exception {
				System.out.println("code:" + ce.getResultCode());
				System.out.println("type:" + ce.getType());
				System.out.println("线程为:" + Thread.currentThread().getName());
			}
		}, pool)
		.forPath("/super/c3","c3内容".getBytes());
		Thread.sleep(Integer.MAX_VALUE);

		// 读取子节点getChildren方法 和 判断节点是否存在checkExists方法

		List<String> list = cf.getChildren().forPath("/super");
		for(String p : list){
			System.out.println(p);
		}

		Stat stat = cf.checkExists().forPath("/super/c3");
		System.out.println(stat);

		Thread.sleep(2000);
		cf.delete().guaranteed().deletingChildrenIfNeeded().forPath("/super");

		//cf.delete().guaranteed().deletingChildrenIfNeeded().forPath("/super");

	}
}