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.

      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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        CuratorFramework client = builder.connectString(server.getConnectString()).namespace("aisa").retryPolicy(new RetryOneTime(1)).build();
        client.start();
        try
        {
            final BlockingQueue<String>     queue = new LinkedBlockingQueue<String>();
            Watcher                         watcher = new Watcher()
            {
                @Override
                public void process(WatchedEvent event)
                {
                    try

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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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                new Callable<Void>()
                {
                    @Override
                    public Void call() throws Exception
                    {
                        Watcher     watcher = new Watcher()
                        {
                            @Override
                            public void process(WatchedEvent event)
                            {
                                synchronized(lock)

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    {
        long            waitTimeMs = connectionTimeoutMs;
        while ( !state.isConnected() && (waitTimeMs > 0) )
        {
            final CountDownLatch            latch = new CountDownLatch(1);
            Watcher tempWatcher = new Watcher()
            {
                @Override
                public void process(WatchedEvent event)
                {
                    latch.countDown();

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            readerFuture.setException(t);
          }
        };


        // Fetch list of broker ids
        Futures.addCallback(zkClient.getChildren(BROKER_IDS_PATH, new Watcher() {
          @Override
          public void process(WatchedEvent event) {
            if (!isRunning()) {
              return;
            }

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                readyFuture.setException(t);
              }
            };


            // Fetch node data
            Futures.addCallback(zkClient.getData(path, new Watcher() {
              @Override
              public void process(WatchedEvent event) {
                if (!isRunning()) {
                  return;
                }

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  /**
   * Checks exists of a given ZK path and execute the action when it exists.
   */
  private void actOnExists(final String path, final Runnable action,
                           final SettableFuture<?> readyFuture, final long retryTime, final TimeUnit retryUnit) {
    Futures.addCallback(zkClient.exists(path, new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        if (!isRunning()) {
          return;
        }

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      final CountDownLatch expireReconnectLatch = new CountDownLatch(1);
      final AtomicBoolean expired = new AtomicBoolean(false);
      final ZKClientService client = ZKClientServices.delegate(ZKClients.reWatchOnExpire(
                                        ZKClientService.Builder.of(zkServer.getConnectionStr())
                                                       .setSessionTimeout(2000)
                                                       .setConnectionWatcher(new Watcher() {
            @Override
            public void process(WatchedEvent event) {
              if (event.getState() == Event.KeeperState.Expired) {
                expired.set(true);
              } else if (event.getState() == Event.KeeperState.SyncConnected && expired.compareAndSet(true, true)) {
                expireReconnectLatch.countDown();
              }
            }
          }).build()));
      client.startAndWait();


      try {
        final BlockingQueue<Watcher.Event.EventType> events = new LinkedBlockingQueue<Watcher.Event.EventType>();
        client.exists("/expireRewatch", new Watcher() {
          @Override
          public void process(WatchedEvent event) {
            client.exists("/expireRewatch", this);
            events.add(event.getType());
          }

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    zkServer.startAndWait();
    int port = zkServer.getLocalAddress().getPort();


    final CountDownLatch disconnectLatch = new CountDownLatch(1);
    ZKClientService client = ZKClientServices.delegate(ZKClients.retryOnFailure(
      ZKClientService.Builder.of(zkServer.getConnectionStr()).setConnectionWatcher(new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        if (event.getState() == Event.KeeperState.Disconnected) {
          disconnectLatch.countDown();
        }

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