分布式ID生成策略之ZK

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;
import org.junit.Before;
import org.junit.Test;
 
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.concurrent.Callable;
 
public class GenerateDistIdClient {
 
    static String path = "/zk-book/";
 
    /**
     一个客户端会话实例
     */
    static CuratorFramework client = CuratorFrameworkFactory.builder().connectString("localhost:2181")
            .sessionTimeoutMs(5000).retryPolicy(new ExponentialBackoffRetry(1000, 3)).build();
 
    @Before
    public void init() {
        //临时节点并自动递归创建父节点
        client.start();
    }
 
    /**
     * 通过调用zk节点创建API接口可以创建一个顺序节点，并在API返回这个节点的完整名字。
     */
    @Test
    public void clientInvoke() {
 
        for (int i = 0; i < 10; i++) {
 
            Callable<String> callable = this::execute;
 
            try {
                String result = callable.call();
//              System.out.println(result + "======");
 
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }
 
    }
 
    public String execute() {
        LocalDateTime now = LocalDateTime.now();
 
        String uuid = String.valueOf(now.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        String result = null;
        try {
            result = client.create().creatingParentsIfNeeded()
                    .forPath(path + uuid, "init".getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(result);
        return result;
 
    }
}