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

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

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

org.apache.curator.framework.recipes.cache.PathChildrenCache

A utility that attempts to keep all data from all children of a ZK path locally cached. This class will watch the ZK path, 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.

        Preconditions.checkNotNull(name, "name cannot be null");
        Preconditions.checkNotNull(threadFactory, "threadFactory cannot be null");


        this.discovery = discovery;


        cache = new PathChildrenCache(discovery.getClient(), discovery.pathForName(name), true, threadFactory);
        cache.getListenable().addListener(this);
    }

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    public static void main(String[] args) throws Exception
    {
        TestingServer       server = new TestingServer();
        CuratorFramework    client = null;
        PathChildrenCache   cache = null;
        try
        {
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new ExponentialBackoffRetry(1000, 3));
            client.start();


            // in this example we will cache data. Notice that this is optional.
            cache = new PathChildrenCache(client, PATH, true);
            cache.start();


            processCommands(client, cache);
        }
        finally
        {

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        _nodes = Maps.newConcurrentMap();
        _listeners = Sets.newSetFromMap(Maps.<NodeListener<T>, Boolean>newConcurrentMap());
        _curator = curator;
        _executor = Executors.newSingleThreadScheduledExecutor(threadFactory);
        _pathCache = new PathChildrenCache(curator, nodePath, true, false, _executor);
        _nodeDataParser = parser;
        _closed = false;
    }

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                .build();


        _nodes = Maps.newConcurrentMap();
        _listeners = Sets.newSetFromMap(Maps.<NodeListener<T>, Boolean>newConcurrentMap());
        _curator = curator;
        _pathCache = new PathChildrenCache(curator, nodePath, true, threadFactory);
        _nodeDataParser = parser;
        _executor = Executors.newSingleThreadScheduledExecutor(threadFactory);
        _closed = false;
    }

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    {
        Preconditions.checkNotNull(threadFactory, "threadFactory cannot be null");


        this.discovery = discovery;


        cache = new PathChildrenCache(discovery.getClient(), discovery.pathForName(name), true, threadFactory);
        cache.getListenable().addListener(this);
    }

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    public static void main(String[] args) throws Exception
    {
        TestingServer       server = new TestingServer();
        CuratorFramework    client = null;
        PathChildrenCache   cache = null;
        try
        {
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new ExponentialBackoffRetry(1000, 3));
            client.start();


            // in this example we will cache data. Notice that this is optional.
            cache = new PathChildrenCache(client, PATH, true);
            cache.start();


            processCommands(client, cache);
        }
        finally
        {

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  {
    log.info("Worker[%s] reportin' for duty!", worker.getHost());


    try {
      final String workerStatusPath = JOINER.join(zkPaths.getIndexerStatusPath(), worker.getHost());
      final PathChildrenCache statusCache = pathChildrenCacheFactory.make(cf, workerStatusPath);
      final SettableFuture<ZkWorker> retVal = SettableFuture.create();
      final ZkWorker zkWorker = new ZkWorker(
          worker,
          statusCache,
          jsonMapper

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      final String loadQueueLocation = ZKPaths.makePath(zkPaths.getLoadQueuePath(), me.getName());
      final String servedSegmentsLocation = ZKPaths.makePath(zkPaths.getServedSegmentsPath(), me.getName());
      final String liveSegmentsLocation = ZKPaths.makePath(zkPaths.getLiveSegmentsPath(), me.getName());


      loadQueueCache = new PathChildrenCache(
          curator,
          loadQueueLocation,
          true,
          true,
          loadingExec

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     * @param path to ZK root parent node for the rest of the configuration properties (ie. /<my-app>/config)
     */
    public ZooKeeperConfigurationSource(CuratorFramework client, String configRootPath) {
        this.client = client;
        this.configRootPath = configRootPath;        
        this.pathChildrenCache = new PathChildrenCache(client, configRootPath, true);
    }

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            // and come back, we expect a removed event in between.
            if (containers.containsKey(containerKey)) {
              log.error("New node[%s] but there was already one.  That's not good, ignoring new one.", child.getPath());
            } else {
              final String inventoryPath = String.format("%s/%s", config.getInventoryPath(), containerKey);
              PathChildrenCache inventoryCache = cacheFactory.make(curatorFramework, inventoryPath);
              inventoryCache.getListenable().addListener(new InventoryCacheListener(containerKey, inventoryPath));


              containers.put(containerKey, new ContainerHolder(container, inventoryCache));


              log.info("Starting inventory cache for %s, inventoryPath %s", containerKey, inventoryPath);
              inventoryCache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
              strategy.newContainer(container);
            }


            break;
          }

View Full Code Here

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