Examples with RetryPolicy org.apache.curator.RetryPolicy used on opensource projects

Example 1 with RetryPolicy

use of org.apache.curator.RetryPolicy in project BRFS by zhangnianli.

the class FileCenter method main.

public static void main(String[] args) {
    id = new Random().nextInt(10);
    System.out.println("id = " + id);
    System.out.println("hahahahha");
    RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
    CuratorFramework client = CuratorFrameworkFactory.builder().namespace(ROOT).connectString(zk_address).retryPolicy(retryPolicy).build();
    client.start();
    try {
        Stat stat = client.checkExists().forPath(DUPS);
        System.out.println("stat =" + stat);
        if (stat == null) {
            System.out.println("create--" + client.create().forPath(DUPS));
        }
        ExecutorService pool = Executors.newFixedThreadPool(5);
        PathChildrenCache pathCache = new PathChildrenCache(client, DUPS, true, false, pool);
        pathCache.getListenable().addListener(new PathNodeListener());
        pathCache.start();
    // TreeCache cache = new TreeCache(client, DUPS);
    // cache.getListenable().addListener(new TreeNodeListener(), pool);
    // cache.start();
    } catch (Exception e) {
        e.printStackTrace();
    }
    synchronized (client) {
        try {
            client.wait();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    client.close();
}

Example 2 with RetryPolicy

use of org.apache.curator.RetryPolicy in project BRFS by zhangnianli.

the class TestZKNode method main.

public static void main(String[] args) throws Exception {
    RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
    CuratorFramework client = CuratorFrameworkFactory.newClient(zk_address, 5 * 1000, 30 * 1000, retryPolicy);
    client.start();
    client.blockUntilConnected();
    PathChildrenCache cache = new PathChildrenCache(client.usingNamespace("test"), "/fileCoordinator/big", true);
    cache.getListenable().addListener(new PathChildrenCacheListener() {

        @Override
        public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
            System.out.println("---" + event);
            ChildData data = event.getData();
            if (data != null) {
                switch(event.getType()) {
                    case CHILD_ADDED:
                        System.out.println("###PATH-" + data.getPath());
                        break;
                    default:
                        break;
                }
            }
        }
    });
    cache.start();
    PersistentNode node = new PersistentNode(client.usingNamespace("test"), CreateMode.EPHEMERAL, false, "/fileCoordinator/temp-1", "node1".getBytes());
    node.getListenable().addListener(new PersistentNodeListener() {

        @Override
        public void nodeCreated(String path) throws Exception {
            System.out.println("node1--created:" + path);
        }
    });
    node.start();
    PersistentNode node2 = new PersistentNode(client.usingNamespace("test"), CreateMode.EPHEMERAL, false, "/fileCoordinator/temp-1", "node2".getBytes());
    node2.getListenable().addListener(new PersistentNodeListener() {

        @Override
        public void nodeCreated(String path) throws Exception {
            System.out.println("node2--created:" + path);
        }
    });
    node2.start();
    Thread.sleep(2000);
    node2.close();
    synchronized (node) {
        node.wait();
    }
}

Example 3 with RetryPolicy

use of org.apache.curator.RetryPolicy in project BRFS by zhangnianli.

the class TestStorer method main.

public static void main(String[] args) throws Exception {
    RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
    CuratorFramework client = CuratorFrameworkFactory.newClient("122.11.47.17:2181", 5 * 1000, 30 * 1000, retryPolicy);
    client.start();
    client.blockUntilConnected();
    FileNodeStorer storer = new ZkFileNodeStorer(client.usingNamespace("test"));
    FileNode node = new FileNode();
    node.setName("file_node_1");
    node.setServiceId("ser_1");
    node.setStorageName("sn_1");
    node.setDuplicates(new int[] { 1, 2, 3 });
    storer.save(node);
    FileNode node2 = storer.getFileNode("file_node_1");
    System.out.println("node2--" + node2.getName());
    node2.setServiceId("ser_2");
    storer.update("file_node_1", node2);
    List<FileNode> nodeList = storer.listFileNodes();
    for (FileNode nd : nodeList) {
        System.out.println("list--" + nd.getName() + ", " + nd.getServiceId());
        storer.delete(nd.getName());
    }
    synchronized (client) {
        client.wait();
    }
}

Example 4 with RetryPolicy

use of org.apache.curator.RetryPolicy in project nifi by apache.

the class CuratorNodeProtocolSender method getServiceAddress.

@Override
protected synchronized InetSocketAddress getServiceAddress() throws IOException {
    if (coordinatorAddress != null) {
        return coordinatorAddress;
    }
    final RetryPolicy retryPolicy = new RetryNTimes(0, 0);
    final CuratorFramework curatorClient = CuratorFrameworkFactory.newClient(zkConfig.getConnectString(), zkConfig.getSessionTimeoutMillis(), zkConfig.getConnectionTimeoutMillis(), retryPolicy);
    curatorClient.start();
    try {
        // Get coordinator address and add watcher to change who we are heartbeating to if the value changes.
        final byte[] coordinatorAddressBytes = curatorClient.getData().usingWatcher(new Watcher() {

            @Override
            public void process(final WatchedEvent event) {
                coordinatorAddress = null;
            }
        }).forPath(coordinatorPath);
        if (coordinatorAddressBytes == null || coordinatorAddressBytes.length == 0) {
            throw new NoClusterCoordinatorException("No node has yet been elected Cluster Coordinator. Cannot establish connection to cluster yet.");
        }
        final String address = new String(coordinatorAddressBytes, StandardCharsets.UTF_8);
        final String[] splits = address.split(":");
        if (splits.length != 2) {
            final String message = String.format("Attempted to determine Cluster Coordinator address. Zookeeper indicates " + "that address is %s, but this is not in the expected format of <hostname>:<port>", address);
            logger.error(message);
            throw new ProtocolException(message);
        }
        logger.info("Determined that Cluster Coordinator is located at {}; will use this address for sending heartbeat messages", address);
        final String hostname = splits[0];
        final int port;
        try {
            port = Integer.parseInt(splits[1]);
            if (port < 1 || port > 65535) {
                throw new NumberFormatException("Port must be in the range of 1 - 65535 but got " + port);
            }
        } catch (final NumberFormatException nfe) {
            final String message = String.format("Attempted to determine Cluster Coordinator address. Zookeeper indicates " + "that address is %s, but the port is not a valid port number", address);
            logger.error(message);
            throw new ProtocolException(message);
        }
        final InetSocketAddress socketAddress = InetSocketAddress.createUnresolved(hostname, port);
        coordinatorAddress = socketAddress;
        return socketAddress;
    } catch (final NoNodeException nne) {
        logger.info("No node has yet been elected Cluster Coordinator. Cannot establish connection to cluster yet.");
        throw new NoClusterCoordinatorException("No node has yet been elected Cluster Coordinator. Cannot establish connection to cluster yet.");
    } catch (final NoClusterCoordinatorException ncce) {
        throw ncce;
    } catch (Exception e) {
        throw new IOException("Unable to determine Cluster Coordinator from ZooKeeper", e);
    } finally {
        curatorClient.close();
    }
}

Example 5 with RetryPolicy

use of org.apache.curator.RetryPolicy in project nifi by apache.

the class CuratorLeaderElectionManager method createClient.

private CuratorFramework createClient() {
    // Create a new client because we don't want to try indefinitely for this to occur.
    final RetryPolicy retryPolicy = new RetryNTimes(1, 100);
    final CuratorACLProviderFactory aclProviderFactory = new CuratorACLProviderFactory();
    final CuratorFramework client = CuratorFrameworkFactory.builder().connectString(zkConfig.getConnectString()).sessionTimeoutMs(zkConfig.getSessionTimeoutMillis()).connectionTimeoutMs(zkConfig.getConnectionTimeoutMillis()).retryPolicy(retryPolicy).aclProvider(aclProviderFactory.create(zkConfig)).defaultData(new byte[0]).build();
    client.start();
    return client;
}