Examples of org.apache.curator.framework.recipes.cache.NodeCache

Package org.apache.curator.framework.recipes.cache

Examples of org.apache.curator.framework.recipes.cache.NodeCache

org.apache.curator.framework.recipes.cache.NodeCache

A utility that attempts to keep the data from a node locally cached. This class will watch the node, respond to update/create/delete events, pull down the data, etc. You can register a listener that will get notified when changes occur.

IMPORTANT - it's not possible to stay transactionally in sync. Users of this class must be prepared for false-positives and false-negatives. Additionally, always use the version number when updating data to avoid overwriting another process' change.

  public void start() {
    LOGGER.debug("Starting...");
    try {
      client.start();
      try {
        agentNodeCache = new NodeCache(client, basePath + "/" + getAgentName());
        agentNodeCache.start();
        agentNodeCache.getListenable().addListener(new NodeCacheListener() {
          @Override
          public void nodeChanged() throws Exception {
            refreshConfiguration();

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      final KijiURI tableURI,
      final TableLayoutUpdateHandler handler
  ) {
    mHandler = handler;
    mTableURI = tableURI;
    mCache = new NodeCache(zkClient, ZooKeeperUtils.getTableLayoutFile(mTableURI).getPath());
    mExecutor = Executors.newSingleThreadExecutor(THREAD_FACTORY);
    mCache.getListenable().addListener(new NodeCacheListener() {
      /** {@inheritDoc}. */
      @Override
      public void nodeChanged() throws Exception {

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    {
        try
        {
            final CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);


            final NodeCache cache = new NodeCache(entry.getClient(), path, dataIsCompressed);
            cache.start(buildInitial);


            Closer closer = new Closer()
            {
                @Override
                public void close()
                {
                    try
                    {
                        cache.close();
                    }
                    catch ( IOException e )
                    {
                        log.error("Could not close left-over NodeCache for path: " + path, e);
                    }
                }
            };
            String id = entry.addThing(cache, closer);


            NodeCacheListener listener = new NodeCacheListener()
            {
                @Override
                public void nodeChanged()
                {
                    entry.addEvent(new RpcCuratorEvent(RpcCuratorEventType.NODE_CACHE, path));
                }
            };
            cache.getListenable().addListener(listener);


            return new NodeCacheProjection(id);
        }
        catch ( Exception e )
        {

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    {
        try
        {
            CuratorEntry entry = CuratorEntry.mustGetEntry(connectionManager, projection);


            NodeCache nodeCache = CuratorEntry.mustGetThing(entry, cacheProjection.id, NodeCache.class);
            return new RpcChildData(nodeCache.getCurrentData());
        }
        catch ( Exception e )
        {
            throw new RpcException(e);
        }

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        this.context = context;
        this.curator = curator;
        this.worker = worker;
        this.repository = repository;
        this.workerPath = ZkPath.TASK_MEMBER_PARTITIONS.getPath(name, context.getId());
        this.cache = new NodeCache(curator, workerPath);
    }

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io.fabric8.partition.internal.TaskHandler

org.apache.curator.x.rpc.idl.services.CuratorProjectionService

org.apache.flume.node.PollingZooKeeperConfigurationProvider

org.apache.zookeeper.data.Stat

org.kiji.schema.zookeeper.TableLayoutTracker

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