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.

    MigrationCleanupThread migrationCleanupThread = new MigrationCleanupThread();
    migrationCleanupThread.start();
    
    tserverSet.startListeningForTabletServerChanges();
    
    ZooReaderWriter.getInstance().getChildren(zroot + Constants.ZRECOVERY, new Watcher() {
      @Override
      public void process(WatchedEvent event) {
        nextEvent.event("Noticed recovery changes", event.getType());
        try {
          // watcher only fires once, add it back

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        // 异步删除
        client.delete().inBackground().forPath("/head");


        // 注册观察者，当节点变动时触发
        client.getData().usingWatcher(new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                System.out.println("node is changed");
            }
        }).inBackground().forPath("/test");

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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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    alwaysRetryWrites = conf.getBoolean("fs.ha.retrywrites", false);
    // The actual name of the filesystem e.g. dfs.data.xxx.com:9000
    this.logicalName = name;
    this.conf = conf;
    // Create AvatarZooKeeperClient
    Watcher watcher = null;
    if (watchZK) {
      watcher = new ZooKeeperFSWatcher();
    }
    zk = new CachingAvatarZooKeeperClient(conf, watcher);
    cacheZKData = zk.isCacheEnabled();

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      prev = child;
    }
    
    final String lockToWatch = path + "/" + prev;
    
    Stat stat = zooKeeper.getStatus(path + "/" + prev, new Watcher() {
      
      @Override
      public void process(WatchedEvent event) {
        
        if (event.getType() == EventType.NodeDeleted && event.getPath().equals(lockToWatch)) {

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    lockWasAcquired = false;
    
    try {
      final String asyncLockPath = zooKeeper.putEphemeralSequential(path + "/" + LOCK_PREFIX, data);
      
      Stat stat = zooKeeper.getStatus(asyncLockPath, new Watcher() {
        
        private void failedToAcquireLock(){
          lw.failedToAcquireLock(new Exception("Lock deleted before acquired"));
          asyncLock = null;
        }

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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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      InterruptedException, KeeperException {
    final BlurConfiguration localConf = getBlurConfiguration(configuration);
    int shardPort = localConf.getInt(BLUR_SHARD_BIND_PORT, 40020);
    String nodeNameHostname = ThriftServer.getNodeName(configuration, BLUR_SHARD_HOSTNAME);
    String nodeName = nodeNameHostname + ":" + (shardPort + shardServer);
    ZooKeeper zk = new ZooKeeperClient(getZkConnectionString(), 30000, new Watcher() {
      @Override
      public void process(WatchedEvent event) {


      }
    });

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      } catch (InterruptedException e) {
        LOG.error(e);
        throw new RuntimeException(e);
      }
      try {
        ZooKeeper zk = new ZooKeeper(zkConnectionString, 30000, new Watcher() {
          @Override
          public void process(WatchedEvent event) {


          }
        });

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    MiniCluster.shutdownZooKeeper();
  }


  @Before
  public void setup() throws KeeperException, InterruptedException, IOException {
    zooKeeper = new ZooKeeperClient(MiniCluster.getZkConnectionString(), 30000, new Watcher() {
      @Override
      public void process(WatchedEvent event) {


      }
    });

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