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.

            } catch (Exception e) {
                LOG.warn("Tried to create path " + path + " but got: " + e, e);
            }
        }


        apiCache = new PathChildrenCache(curatorFramework, path, false);
        apiCache.getListenable().addListener(new PathChildrenCacheListener() {
            @Override
            public void childEvent(CuratorFramework curatorFramework, PathChildrenCacheEvent event) throws Exception {
                try {
                    LOG.debug("event: " + event);

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    @Override
    public synchronized void start() {
        try {
            ZooKeeperUtils.createDefault(curator, partitionsPath, null);
            if (partitionCache == null) {
                partitionCache = new PathChildrenCache(curator, partitionsPath, true, false, executorService);
                partitionCache.getListenable().addListener(this);
                partitionCache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
                partitionCache.rebuild();
            }
        } catch (Exception e) {

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  public ZooKeeperHealthChecker(final ZooKeeperClient zooKeeperClient, final String path,
                                final RiemannFacade facade, final TimeUnit timeUnit,
                                final long interval) {
    super();
    this.scheduler = Executors.newScheduledThreadPool(2);
    this.cache = new PathChildrenCache(zooKeeperClient.getCuratorFramework(), path, true, false,
        scheduler);
    this.facade = facade.stack("zookeeper-connection");
    this.timeUnit = timeUnit;
    this.interval = interval;

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        this.client = client;
        this.defaults = defaults;
        this.hostname = hostname;
        configPath = ZKPaths.makePath(baseZPath, CONFIG_PATH);
        lockPath = ZKPaths.makePath(baseZPath, LOCK_PATH);
        cache = new PathChildrenCache(client, configPath, true);
    }

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