Examples of org.apache.zookeeper.ZooKeeper

org.apache.zookeeper.ZooKeeper
This is the main class of ZooKeeper client library. To use a ZooKeeper service, an application must first instantiate an object of ZooKeeper class. All the iterations will be done by calling the methods of ZooKeeper class.
Once a connection to a server is established, a session ID is assigned to the client. The client will send heart beats to the server periodically to keep the session valid.
The application can call ZooKeeper APIs through a client as long as the session ID of the client remains valid.
If for some reason, the client fails to send heart beats to the server for a prolonged period of time (exceeding the sessionTimeout value, for instance), the server will expire the session, and the session ID will become invalid. The client object will no longer be usable. To make ZooKeeper API calls, the application must create a new client object.
If the ZooKeeper server the client currently connects to fails or otherwise does not respond, the client will automatically try to connect to another server before its session ID expires. If successful, the application can continue to use the client.
Some successful ZooKeeper API calls can leave watches on the "data nodes" in the ZooKeeper server. Other successful ZooKeeper API calls can trigger those watches. Once a watch is triggered, an event will be delivered to the client which left the watch at the first place. Each watch can be triggered only once. Thus, up to one event will be delivered to a client for every watch it leaves.
A client needs an object of a class implementing Watcher interface for processing the events delivered to the client. When a client drops current connection and re-connects to a server, all the existing watches are considered as being triggered but the undelivered events are lost. To emulate this, the client will generate a special event to tell the event handler a connection has been dropped. This special event has type EventNone and state sKeeperStateDisconnected.

    
    this.clearUpFiles(TestConf.tmpPath);
  }
  
  public ZooKeeper initZK() throws Exception{
    ZooKeeper zk = new ZooKeeper(TestConf.host, Constants.SESSION_TIMEOUT, null);
    List<ACL> acls = new ArrayList<ACL>();
    acls.add(new ACL(Perms.ALL, Ids.ANYONE_ID_UNSAFE));
    zk.create("/iserviceTest", "root".getBytes(), acls, CreateMode.PERSISTENT);
    zk.create("/iserviceTest/node1", "node1".getBytes(), acls, CreateMode.PERSISTENT);
    zk.create("/iserviceTest/node2", "node2".getBytes(), acls, CreateMode.PERSISTENT);
    zk.create("/iserviceTest/node1/node3", "node3".getBytes(), acls, CreateMode.PERSISTENT);
    zk.create("/iserviceTest/node1/node4", "node4".getBytes(), acls, CreateMode.PERSISTENT);
    return zk;
  }

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  private ZooKeeper zk;
  private int count;
  
  public ChangeZkTask2(String host, String root) throws IOException{
    this.zk = new ZooKeeper(host + root, Constants.SESSION_TIMEOUT, null);
    this.count = 0;
  }

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  }
  
  
  public void initZk() throws Exception{
    ZooKeeper zk = new ZooKeeper(DemoConf.host + DemoConf.root, Constants.SESSION_TIMEOUT, null);
    List<ACL> acls = new ArrayList<ACL>();
    acls.add(new ACL(Perms.ALL, Ids.ANYONE_ID_UNSAFE));
    
    if(zk.exists("/IserviceDemoTest", false) == null){
      zk.create("/IserviceDemoTest", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group2", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app1", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2/key1", "in group1/app2, i'm key1 version-1".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2/key2", "".getBytes(), acls, CreateMode.PERSISTENT);
    }  


  }

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  private ZooKeeper zk;
  private int count;
  
  public ChangeZkTask(String host, String root) throws IOException{
    this.zk = new ZooKeeper(host + root, Constants.SESSION_TIMEOUT, null);
    this.count = 0;
  }

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    timer.schedule(task, 0, 10000);
    
  }
  
  public void initZk() throws Exception{
    ZooKeeper zk = new ZooKeeper(DemoConf.host + DemoConf.root, Constants.SESSION_TIMEOUT, null);
    List<ACL> acls = new ArrayList<ACL>();
    acls.add(new ACL(Perms.ALL, Ids.ANYONE_ID_UNSAFE));
    
    if(zk.exists("/IserviceDemoTest", false) == null){
      zk.create("/IserviceDemoTest", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group2", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app1", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2", "".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2/key1", "in group1/app2, i'm key1 version-1".getBytes(), acls, CreateMode.PERSISTENT);
      zk.create("/IserviceDemoTest/group1/app2/key2", "".getBytes(), acls, CreateMode.PERSISTENT);
    }  


  }

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    if (StringUtils.isNotEmpty(config.getZkServer()))
    {
      try
      {
        AnalyzerZKWatcher<SlaveConfig> analyzerZKWatcher = new AnalyzerZKWatcher<SlaveConfig>(config);
        zk = new ZooKeeper(config.getZkServer(),3000,analyzerZKWatcher);
        analyzerZKWatcher.setZk(zk);
        
        //每次启动时都先检查是否有根目录
        ZKUtil.createGroupNodesIfNotExist(zk,config.getGroupId());

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    {
      try
      {
        AnalyzerZKWatcher<MasterConfig> analyzerZKWatcher = 
            new AnalyzerZKWatcher<MasterConfig>(config);
        zk = new ZooKeeper(config.getZkServer(),3000,analyzerZKWatcher);
        analyzerZKWatcher.setZk(zk);
        
        //每次启动时都先检查是否有根目录
        ZKUtil.createGroupNodesIfNotExist(zk,config.getGroupId());

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    {
      try
      {
        AnalyzerZKWatcher<MasterConfig> analyzerZKWatcher = 
            new AnalyzerZKWatcher<MasterConfig>(config);
        zk = new ZooKeeper(config.getZkServer(),3000,analyzerZKWatcher);
        analyzerZKWatcher.setZk(zk);
        
        ZKUtil.createGroupNodesIfNotExist(zk,config.getGroupId());
      }
      catch(Exception ex)

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    BlurQueryChecker queryChecker = new BlurQueryChecker(configuration);


    int sessionTimeout = configuration.getInt(BLUR_ZOOKEEPER_TIMEOUT, BLUR_ZOOKEEPER_TIMEOUT_DEFAULT);


    final ZooKeeper zooKeeper = ZkUtils.newZooKeeper(zkConnectionStr, sessionTimeout);


    BlurUtil.setupZookeeper(zooKeeper, configuration.get(BLUR_CLUSTER_NAME));


    final ZookeeperClusterStatus clusterStatus = new ZookeeperClusterStatus(zooKeeper, configuration);

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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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