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.


    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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      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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    zkClient.subscribeStateChanges(listener);
    ZkConnection connection = ((ZkConnection) zkClient.getConnection());
    ZooKeeper oldZookeeper = connection.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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  @Override
  public void connect() throws IOException, InterruptedException {
    if (client == null) {
      if (logger.isDebugEnabled())
        logger.debug("connect(" + serverLocation + "): Connecting begin");
      client = new ZooKeeper(serverLocation, 5000, new Watcher() {
        @Override
        public void process(WatchedEvent event) {
        }
      });
      int waitCount = 0;

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        // ZK ephemeral node for this Bookie.
        String zkBookieRegPath = this.bookieRegistrationPath
            + StringUtils.addrToString(getBookieAddress(conf));
        final CountDownLatch prevNodeLatch = new CountDownLatch(1);
        try{
            Watcher zkPrevRegNodewatcher = new Watcher() {
                @Override
                public void process(WatchedEvent event) {
                    // Check for prev znode deletion. Connection expiration is
                    // not handling, since bookie has logic to shutdown.
                    if (EventType.NodeDeleted == event.getType()) {

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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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        zkArr[0] = null; // not used.
        for (int i = 1; i <= qu.ALL; i++) {
            // server ids are 1, 2 and 3
            zkArr[i] = new ZooKeeper("127.0.0.1:"
                    + qu.getPeer(i).peer.getClientPort(),
                    ClientBase.CONNECTION_TIMEOUT, new Watcher() {
                        public void process(WatchedEvent event) {
                        }});
        }
        return zkArr;
    }

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          }
          Assert.fail("client port didn't change");
        } catch (KeeperException.ConnectionLossException e) {
            zkArr[observerIndex] = new ZooKeeper("127.0.0.1:"
                    + qu.getPeer(observerIndex).peer.getClientPort(),
                    ClientBase.CONNECTION_TIMEOUT, new Watcher() {
                        public void process(WatchedEvent event) {}});
        }


        leaderIndex = getLeaderId(qu);

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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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    zkClient.subscribeStateChanges(listener);
    ZkConnection connection = ((ZkConnection) zkClient.getConnection());
    ZooKeeper oldZookeeper = connection.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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