Example usage for org.apache.zookeeper Watcher Watcher

Introduction

In this page you can find the example usage for org.apache.zookeeper Watcher Watcher.

Prototype

Watcher

Source Link

Usage

From source file:sleet.utils.zookeeper.ZkMiniCluster.java

License:Apache License

public void startZooKeeper(final Properties properties, boolean format, String path, final boolean randomPort) {
    String realPath = path + "/zk_test";
    properties.setProperty("dataDir", realPath);
    final ServerConfig serverConfig = new ServerConfig();
    QuorumPeerConfig config = new QuorumPeerConfig() {
        @Override/* w w w  . j a  va 2  s.  c  o m*/
        public InetSocketAddress getClientPortAddress() {
            InetSocketAddress clientPortAddress = super.getClientPortAddress();
            if (randomPort) {
                return randomPort(clientPortAddress);
            }
            return clientPortAddress;
        }

        private InetSocketAddress randomPort(InetSocketAddress clientPortAddress) {
            return new InetSocketAddress(clientPortAddress.getAddress(), 0);
        }
    };
    try {
        config.parseProperties(properties);
    } catch (IOException e) {
        LOG.error(e.toString());
        throw new RuntimeException(e);
    } catch (ConfigException e) {
        LOG.error(e.toString());
        throw new RuntimeException(e);
    }
    serverConfig.readFrom(config);
    rm(new File(realPath));
    serverThread = new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                zooKeeperServerMain = new ZooKeeperServerMainEmbedded();
                zooKeeperServerMain.runFromConfig(serverConfig);
            } catch (IOException e) {
                LOG.error(e.toString());
            }
        }
    });
    serverThread.start();
    long s = System.nanoTime();
    while (s + 10000000000L > System.nanoTime()) {
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
            LOG.error(e.toString());
            throw new RuntimeException(e);
        }
        try {
            String zkConnectionString = getZkConnectionString();
            if (zkConnectionString == null) {
                continue;
            }
            ZooKeeper zk = new ZooKeeper(getZkConnectionString(), 30000, new Watcher() {
                @Override
                public void process(WatchedEvent event) {

                }
            });
            zk.close();
            break;
        } catch (IOException e) {
            LOG.error(e.toString());
            throw new RuntimeException(e);
        } catch (InterruptedException e) {
            LOG.error(e.toString());
            throw new RuntimeException(e);
        }
    }
}

From source file:yangqi.zookeeper.example.masterworker.ChildrenCallbackMonitor.java

License:Open Source License

/**
 * @param args//from  w w w .  j  a  va 2 s  . c o m
 * @throws IOException
 * @throws InterruptedException
 */
public static void main(String[] args) throws IOException, InterruptedException {
    final ZooKeeper zookeeper = new ZooKeeper("localhost:2181", 2000, null);

    final ChildrenCallback callback = new ChildrenCallback() {

        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            System.out.println(children);

        }

    };

    Watcher watcher = new Watcher() {

        @Override
        public void process(WatchedEvent event) {
            System.out.println("Event is " + event);
            if (event.getType() == EventType.NodeChildrenChanged) {
                System.out.println("Changed " + event);
                zookeeper.getChildren("/workers", this, callback, null);
            }
        }
    };

    zookeeper.getChildren("/workers", watcher, callback, null);

    System.out.println("begin finish");
    Thread.sleep(200000);
    System.out.println("finish");

}

From source file:yangqi.zookeeper.example.masterworker.SessionWatch.java

License:Open Source License

/**
 * @param args// www.  ja  v  a  2  s . c o m
 * @throws IOException
 * @throws InterruptedException
 */
public static void main(String[] args) throws IOException, InterruptedException {
    ZooKeeper zookeeper = new ZooKeeper("localhost:2181", 2000, new Watcher() {

        @Override
        public void process(WatchedEvent event) {
            System.out.println("Event is " + event);
        }

    });

    Thread.sleep(200000);

}

From source file:zookeeper.recipes.leader.LeaderLatch.java

License:Apache License

private void checkLeadership(List<String> children) throws Exception {
    List<String> sortedChildren = LockInternals.getSortedChildren(LOCK_NAME, sorter, children);
    int ourIndex = (ourPath != null) ? sortedChildren.indexOf(ZKPaths.getNodeFromPath(ourPath)) : -1;
    if (ourIndex < 0) {
        log.error("Can't find our node. Resetting. Index: " + ourIndex);
        reset();//w  w w.  j a  va 2 s.  com
    } else if (ourIndex == 0) {
        setLeadership(true);
    } else {
        String watchPath = sortedChildren.get(ourIndex - 1);
        Watcher watcher = new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if ((state.get() == State.STARTED) && (event.getType() == Event.EventType.NodeDeleted)
                        && (ourPath != null)) {
                    try {
                        getChildren();
                    } catch (Exception ex) {
                        log.error("An error occurred checking the leadership.", ex);
                    }
                }
            }
        };

        BackgroundCallback callback = new BackgroundCallback() {
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                if (event.getResultCode() == KeeperException.Code.NONODE.intValue()) {
                    // previous node is gone - reset
                    reset();
                }
            }
        };
        client.checkExists().usingWatcher(watcher).inBackground(callback)
                .forPath(ZKPaths.makePath(latchPath, watchPath));
    }
}