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.


  private ServerWatcher modelWatcher = new ServerWatcher();


  public Server(int port) throws TTransportException, IOException,
      InterruptedException, KeeperException {
    zk = new ZooKeeper("localhost", 2181, new Watcher() {
      @Override
      public void process(WatchedEvent watchedEvent) {
        // ignore
      }
    });

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    "talk.politics.mideast",
    "talk.politics.misc",
    "talk.religion.misc");


  public static void main(String[] args) throws TException, IOException, InterruptedException, KeeperException {
    ZooKeeper zk = new ZooKeeper("localhost", 2181, new Watcher() {
      @Override
      public void process(WatchedEvent watchedEvent) {
        // ignore
      }
    });

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         // ok ... so now we have stuff going all the way through. let's kick
         // the middle Mp's zookeeper cluster and see what happens.
         ZooKeeper origZk = zookeeperCluster.zkref.get();
         long sessionid = origZk.getSessionId();
         ZooKeeper killer = new ZooKeeper(System.getProperty("zk_connect"),5000, new Watcher() { @Override public void process(WatchedEvent arg0) { } }, sessionid, null);
         killer.close(); // tricks the server into expiring the other session


//         // we should be getting failures now ... 
//         // but it's possible that it can reconnect prior to actually seeing an error so if this 
//         //   fails frequently we need to remove this test.

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         if (!calledBack)
            killer.close(); 


         final AtomicBoolean isExpired = new AtomicBoolean(false);
         ZooKeeper check = new ZooKeeper("127.0.0.1:" + port,5000, new Watcher()
         {
            @Override
            public void process(WatchedEvent event)
            {
               if (event.getState() == Watcher.Event.KeeperState.Expired)

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        public Watcher expirePart1(int which) {
            String path = serverIds.get(which);
            System.out.printf("before %s[%s] = %s\n", Thread.currentThread().getId(), System.identityHashCode(data), data);
            data.remove(path);
            System.out.printf("after %s[%s] = %s\n", Thread.currentThread().getId(), System.identityHashCode(data), data);
            Watcher oldWatch = watchers.remove(which);


            // notify all other nodes that node "which" has disappeared
            String dir = path.replaceAll("^(.*?)(/[^/]*)?$", "$1");
            if (watched.contains(dir)) {
                for (Watcher watcher : Lists.newArrayList(watchers)) {

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        fake.disconnect(0);
        // TODO this breaks because the mocking causes the update not to propagate from one thread to another
        // very mysterious, but essentially undebuggable without some help from the author of jmockit.


        Watcher w = fake.expirePart1(0);


        // the other (unexpired) server should now know it is the only one
        assertEquals(1, Iterables.size(cs2.getCluster()));


        fake.expirePart2(w);

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      throw new RuntimeException(e);
    }
  }


  public ZookeeperClusterStatus(String connectionStr, BlurConfiguration configuration) throws IOException {
    this(new ZooKeeper(connectionStr, 30000, new Watcher() {
      @Override
      public void process(WatchedEvent event) {


      }
    }), configuration);

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  }


  public void register(final BlurShutdown shutdown, ZooKeeper zooKeeper) {
    this.shutdown = shutdown;
    this.zooKeeper = zooKeeper;
    zooKeeper.register(new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        KeeperState state = event.getState();
        if (state == KeeperState.Expired) {
          LOG.fatal("Zookeeper session has [" + state + "] server process shutting down.");

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   * Constructor
   * @param conf
   * @throws IOException
   */
  public ZooKeeperAuthenticator(HBaseConfiguration conf) throws IOException {
    this(conf, new ZooKeeperWrapper(conf, new Watcher() {
      public void process(WatchedEvent event) { }
    }));
    ensureExists(USERS_ZNODE_ROOT);
  }

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

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