Examples of org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher
This interface specifies the public interface an event handler class must implement. A ZooKeeper client will get various events from the ZooKeepr server it connects to. An application using such a client handles these events by registering a callback object with the client. The callback object is expected to be an instance of a class that implements Watcher interface.

    HServerLoad load = useInfoLoad ? info.getLoad() : new HServerLoad();
    String serverName = HServerInfo.getServerName(info);
    info.setLoad(load);
    // We must set this watcher here because it can be set on a fresh start
    // or on a failover
    Watcher watcher = new ServerExpirer(serverName, info.getServerAddress());
    zooKeeperWrapper.updateRSLocationGetWatch(info, watcher);
    serversToServerInfo.put(serverName, info);
    serverAddressToServerInfo.put(info.getServerAddress(), info);
    serversToLoad.put(serverName, load);
    synchronized (loadToServers) {

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  @Before
  public void setUp() throws IOException, InterruptedException {
    final Object lock = new Object();
    synchronized (lock) {
      _zooKeeper = new ZooKeeper("127.0.0.1:10101", 10000, new Watcher() {
        @Override
        public void process(WatchedEvent event) {
          synchronized (lock) {
            lock.notifyAll();
          }

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  public static void waitUntilExists(ZooKeeper zooKeeper, String path) {
    final Object o = new Object();
    try {
      while (true) {
        Stat stat = zooKeeper.exists(path, new Watcher() {
          @Override
          public void process(WatchedEvent event) {
            synchronized (o) {
              o.notifyAll();
            }

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  public WatchNodeExistance watch(final OnChange onChange) {
    _watchThread = new Thread(new Runnable() {
      @Override
      public void run() {
        Watcher watcher = new Watcher() {
          @Override
          public void process(WatchedEvent event) {
            synchronized (_lock) {
              _lock.notify();
            }

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  public WatchNodeData watch(final OnChange onChange) {
    _watchThread = new Thread(new Runnable() {


      @Override
      public void run() {
        Watcher watcher = new Watcher() {
          @Override
          public void process(WatchedEvent event) {
            synchronized (_lock) {
              _lock.notify();
            }

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    _zkClient.subscribeStateChanges(listener);
    ZkConnection connection = ((ZkConnection) _zkClient.getConnection());
    ZooKeeper zookeeper = connection.getZookeeper();
    System.out.println("old sessionId= " + zookeeper.getSessionId());
    Watcher watcher = new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        System.out.println("In New connection In process event:" + event);
      }
    };

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    zkClient.subscribeStateChanges(listener);
    ZkConnection connection = ((ZkConnection) zkClient.getConnection());
    ZooKeeper curZookeeper = connection.getZookeeper();
    LOG.info("Before expiry. sessionId: " + Long.toHexString(curZookeeper.getSessionId()));


    Watcher watcher = new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        LOG.info("Process watchEvent: " + event);
      }
    };

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    ZkConnection connection = ((ZkConnection) zkClient.getConnection());
    ZooKeeper curZookeeper = connection.getZookeeper();
    String oldSessionId = Long.toHexString(curZookeeper.getSessionId());
    LOG.info("Before session expiry. sessionId: " + oldSessionId + ", zk: " + curZookeeper);


    Watcher watcher = new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        LOG.info("Watcher#process, event: " + event);
      }
    };

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  public static void asyncExpireSession(final ZkClient zkClient) throws Exception {
    ZkConnection connection = ((ZkConnection) zkClient.getConnection());
    ZooKeeper curZookeeper = connection.getZookeeper();
    LOG.info("Before expiry. sessionId: " + Long.toHexString(curZookeeper.getSessionId()));


    Watcher watcher = new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        LOG.info("Process watchEvent: " + event);
      }
    };

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  protected void simulateSessionExpiry(ZkConnection zkConnection) throws IOException,
      InterruptedException {
    ZooKeeper oldZookeeper = zkConnection.getZookeeper();
    LOG.info("Old sessionId = " + oldZookeeper.getSessionId());


    Watcher watcher = new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        LOG.info("In New connection, process event:" + event);
      }
    };

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