Examples of org.apache.helix.store.zk.ZNode

org.apache.helix.store.zk.ZNode


      String parentPath = HelixUtil.getZkParentPath(path);
      String name = HelixUtil.getZkName(path);
      removeFromParentChildSet(parentPath, name);


      ZNode znode = _cache.remove(path);
      if (znode != null) {
        // recursively remove children nodes
        Set<String> childNames = znode.getChildSet();
        for (String childName : childNames) {
          String childPath = path + "/" + childName;
          purgeRecursive(childPath);
        }
      }

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    String serverPath = prependChroot(clientPath);


    Cache<T> cache = getCache(serverPath);
    if (cache != null) {
      T record = null;
      ZNode znode = cache.get(serverPath);


      if (znode != null) {
        // TODO: shall return a deep copy instead of reference
        record = ((T) znode.getData());
        if (stat != null) {
          DataTree.copyStat(znode.getStat(), stat);
        }
        return record;


      } else {
        // if cache miss, fall back to zk and update cache

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    String serverPath = prependChroot(clientPath);


    Cache<T> cache = getCache(serverPath);
    if (cache != null) {
      Stat stat = new Stat();
      ZNode znode = cache.get(serverPath);


      if (znode != null) {
        return znode.getStat();


      } else {
        // if cache miss, fall back to zk and update cache
        try {
          cache.lockWrite();

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    Cache<T> cache = getCache(serverPaths);
    if (cache != null) {
      try {
        cache.lockRead();
        for (int i = 0; i < size; i++) {
          ZNode zNode = cache.get(serverPaths.get(i));
          if (zNode != null) {
            // TODO: shall return a deep copy instead of reference
            records.set(i, (T) zNode.getData());
            readStats.set(i, zNode.getStat());
          } else {
            needRead = true;
            needReads[i] = true;
          }
        }

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    String serverParentPath = prependChroot(parentPath);


    Cache<T> cache = getCache(serverParentPath);
    if (cache != null) {
      // System.out.println("zk-cache");
      ZNode znode = cache.get(serverParentPath);


      if (znode != null && znode.getChildSet() != Collections.<String> emptySet()) {
        // System.out.println("zk-cache-hit: " + parentPath);
        List<String> childNames = new ArrayList<String>(znode.getChildSet());
        Collections.sort(childNames);
        return childNames;
      } else {
        // System.out.println("zk-cache-miss");
        try {

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  public void update(String path, T data, Stat stat) {
    String parentPath = HelixUtil.getZkParentPath(path);
    String childName = HelixUtil.getZkName(path);


    addToParentChildSet(parentPath, childName);
    ZNode znode = _cache.get(path);
    if (znode == null) {
      _cache.put(path, new ZNode(path, data, stat));
      fireEvents(path, EventType.NodeCreated);
    } else {
      Stat oldStat = znode.getStat();


      znode.setData(data);
      znode.setStat(stat);
      // System.out.println("\t\t--setData. path: " + path + ", data: " + data);


      if (oldStat.getCzxid() != stat.getCzxid()) {
        fireEvents(path, EventType.NodeDeleted);
        fireEvents(path, EventType.NodeCreated);

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        // we still need to subscribe child change
      }


      // recursively update children nodes if not exists
      // System.out.println("subcribeChildChange: " + path);
      ZNode znode = _cache.get(path);
      List<String> childNames = _accessor.subscribeChildChanges(path, this);
      if (childNames != null && !childNames.isEmpty()) {
        for (String childName : childNames) {
          if (!znode.hasChild(childName)) {
            String childPath = path + "/" + childName;
            znode.addChild(childName);
            updateRecursive(childPath);
          }
        }
      }
    } finally {

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      // TODO: optimize it by get stat from callback
      Stat stat = new Stat();
      Object readData = _accessor.get(dataPath, stat, AccessOption.THROW_EXCEPTION_IFNOTEXIST);


      ZNode znode = _cache.get(dataPath);
      if (znode != null) {
        Stat oldStat = znode.getStat();


        // System.out.println("handleDataChange: " + dataPath + ", data: " + data);
        // System.out.println("handleDataChange: " + dataPath + ", oldCzxid: " +
        // oldStat.getCzxid() + ", newCzxid: " + stat.getCzxid()
        // + ", oldVersion: " + oldStat.getVersion() + ", newVersion: " +
        // stat.getVersion());
        znode.setData(readData);
        znode.setStat(stat);


        // if create right after delete, and zkCallback comes after create
        // no DataDelete() will be fired, instead will fire 2 DataChange()
        // see ZkClient.fireDataChangedEvents()
        if (oldStat.getCzxid() != stat.getCzxid()) {

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    String serverPath = prependChroot(clientPath);


    Cache<T> cache = getCache(serverPath);
    if (cache != null) {
      T record = null;
      ZNode znode = cache.get(serverPath);


      if (znode != null) {
        // TODO: shall return a deep copy instead of reference
        record = ((T) znode.getData());
        if (stat != null) {
          DataTree.copyStat(znode.getStat(), stat);
        }
        return record;


      } else {
        // if cache miss, fall back to zk and update cache

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    String serverPath = prependChroot(clientPath);


    Cache<T> cache = getCache(serverPath);
    if (cache != null) {
      Stat stat = new Stat();
      ZNode znode = cache.get(serverPath);


      if (znode != null) {
        return znode.getStat();


      } else {
        // if cache miss, fall back to zk and update cache
        try {
          cache.lockWrite();

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Related Classes of org.apache.helix.store.zk.ZNode

org.apache.helix.manager.zk.Cache

org.apache.helix.manager.zk.WriteThroughCache

org.apache.helix.manager.zk.ZkCacheBaseDataAccessor

org.apache.helix.manager.zk.ZkCallbackCache

org.apache.helix.TestHelper

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