Zookeeper全局唯一ID生成方案解析

public int idGen() throws Exception {
  String zkAddress = "127.0.0.1:2181";
  String idNode = "/id";

  //重试策略
  RetryPolicy retry = new RetryNTimes(3, 2000);
  //创建连接客户端
  CuratorFramework client = CuratorFrameworkFactory.builder().
      connectString(zkAddress).
      sessionTimeoutMs(5000).
      connectionTimeoutMs(10000).
      retryPolicy(retry).
      build();
  //启动客户端
  client.start();

  if (null == client.checkExists().forPath(idNode)) {
    client.create().withMode(CreateMode.PERSISTENT)
        .forPath(idNode);
  }
  Stat stat = client.setData().withVersion(-1).forPath(idNode);
  return stat.getVersion();
}