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.


  static ZooKeeper connectZooKeeper()
      throws IOException, KeeperException, InterruptedException {
    final CountDownLatch latch = new CountDownLatch(1);


    ZooKeeper zkc = new ZooKeeper(zkEnsemble, 3600, new Watcher() {
        public void process(WatchedEvent event) {
          if (event.getState() == Watcher.Event.KeeperState.SyncConnected) {
            latch.countDown();
          }
        }

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    }


    public CuratorFrameworkImpl(CuratorFrameworkFactory.Builder builder)
    {
        ZookeeperFactory localZookeeperFactory = makeZookeeperFactory(builder.getZookeeperFactory());
        this.client = new CuratorZookeeperClient(localZookeeperFactory, builder.getEnsembleProvider(), builder.getSessionTimeoutMs(), builder.getConnectionTimeoutMs(), new Watcher()
        {
            @Override
            public void process(WatchedEvent watchedEvent)
            {
                CuratorEvent event = new CuratorEventImpl(CuratorFrameworkImpl.this, CuratorEventType.WATCHED, watchedEvent.getState().getIntValue(), unfixForNamespace(watchedEvent.getPath()), null, null, null, null, null, watchedEvent, null);

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        boolean         hasTimeout = (unit != null);
        long            maxWaitMs = hasTimeout ? TimeUnit.MILLISECONDS.convert(timeout, unit) : Long.MAX_VALUE;
        for(;;)
        {
            final CountDownLatch    latch = new CountDownLatch(1);
            Watcher                 watcher = new Watcher()
            {
                @Override
                public void process(WatchedEvent event)
                {
                    latch.countDown();

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            Assert.assertTrue(node.waitForInitialCreate(timing.forWaiting().seconds(), TimeUnit.SECONDS));


            Assert.assertEquals(client.getData().forPath(node.getActualPath()), "a".getBytes());


            final Semaphore semaphore = new Semaphore(0);
            Watcher watcher = new Watcher()
            {
                @Override
                public void process(WatchedEvent arg0)
                {
                    semaphore.release();

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    private void reportToZookeeper() throws Throwable
    {
        try
        {
            zk_ = new ZooKeeper(DatabaseDescriptor.getZkAddress(), DatabaseDescriptor.getZkSessionTimeout(), new Watcher()
                {
                    public void process(WatchedEvent we)
                    {                    
                        String path = "/Cassandra/" + DatabaseDescriptor.getClusterName() + "/Leader";
                        String eventPath = we.getPath();

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      throws IOException, KeeperException, InterruptedException, ServiceException {
    final RecoverableZooKeeper recoverableZk = Mockito
        .mock(RecoverableZooKeeper.class);
    AssignmentManagerWithExtrasForTesting am = setUpMockedAssignmentManager(
        this.server, this.serverManager);
    Watcher zkw = new ZooKeeperWatcher(HBaseConfiguration.create(), "unittest",
        null) {
      public RecoverableZooKeeper getRecoverableZooKeeper() {
        return recoverableZk;
      }
    };

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            setLeadership(true);
        }
        else
        {
            String watchPath = sortedChildren.get(ourIndex - 1);
            Watcher watcher = new Watcher()
            {
                @Override
                public void process(WatchedEvent event)
                {
                    if ( (state.get() == State.STARTED) && (event.getType() == Event.EventType.NodeDeleted) && (localOurPath != null) )

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    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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  private static ZooKeeper connectZooKeeper(String ensemble)
      throws IOException, KeeperException, InterruptedException {
    final CountDownLatch latch = new CountDownLatch(1);


    ZooKeeper zkc = new ZooKeeper(HOSTPORT, 3600, new Watcher() {
      public void process(WatchedEvent event) {
        if (event.getState() == Watcher.Event.KeeperState.SyncConnected) {
          latch.countDown();
        }
      }

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  final List<String> hosts = new ArrayList<String>();
  
  public ZooSpanClient(String keepers, final String path, String host, String service, long millis) throws IOException, KeeperException, InterruptedException {
    super(host, service, millis);
    this.path = path;
    zoo = new ZooKeeper(keepers, 30 * 1000, new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        try {
          if (zoo != null) {
            updateHosts(path, zoo.getChildren(path, null));

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