public class DataChange

{

    // private static final Log LOGGER = LogFactory.getLog(DataChange.class);



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

    {

        CountDownLatch countDownLatch = new CountDownLatch(1);



        ZooKeeper zkeeper = new ZooKeeper("localhost", 1000, new Watcher()

        {

            @Override

            public void process(WatchedEvent event)

            {

                if (event.getState() == KeeperState.Disconnected)

                {

                    countDownLatch.countDown();

                }

            }

        });

        dataChange(zkeeper);

        countDownLatch.await();

        zkeeper.close();

    }



    private static void dataChange(ZooKeeper zkeeper) throws KeeperException, InterruptedException

    {

        if (null != zkeeper.exists("/root/child", true))

        {

            zkeeper.getData("/root/child", new Watcher()

            {

                @Override

                public void process(WatchedEvent event)

                {

                    System.out.println("data change : " + event);

                    try

                    {

                        dataChange(zkeeper);

                    } catch (KeeperException e)

                    {

                        e.printStackTrace();

                    } catch (InterruptedException e)

                    {

                        e.printStackTrace();

                    }

                }

            }, null);

        }

    }

}