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:com.digitgroup.fullstackroad.j2ee.zookeeper.recovery.OrphanStatuses.java

License:Apache License

public static void main(String args[]) throws Exception {
    ZooKeeper zk = new ZooKeeper("localhost:" + args[0], 10000, new Watcher() {
        public void process(WatchedEvent event) {
            LOG.info("Received event: " + event.getType());
        }/*from w ww .j av  a2 s. c o  m*/
    });

    (new OrphanStatuses(zk)).cleanUp();
}

From source file:com.dingwang.rpc.register.ServiceDiscovery.java

License:Open Source License

private ZooKeeper connectServer() {
    ZooKeeper zk = null;//from   ww w.  j  a v  a 2  s.  c  om
    try {
        zk = new ZooKeeper(registryAddress, Constant.ZK_SESSION_TIMEOUT, new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if (event.getState() == Event.KeeperState.SyncConnected) {
                    latch.countDown();
                }
            }
        });
        latch.await();
    } catch (IOException | InterruptedException e) {
        LOGGER.error("", e);
    }
    return zk;
}

From source file:com.dingwang.rpc.register.ServiceDiscovery.java

License:Open Source License

private void watchNode(final ZooKeeper zk) {
    try {//w ww. j av a2 s .c om
        List<String> nodeList = zk.getChildren(Constant.ZK_REGISTRY_PATH, new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if (event.getType() == Event.EventType.NodeChildrenChanged) {
                    watchNode(zk);
                }
            }
        });
        List<String> dataList = new ArrayList<>();
        for (String node : nodeList) {
            byte[] bytes = zk.getData(Constant.ZK_REGISTRY_PATH + "/" + node, false, null);
            dataList.add(new String(bytes));
        }
        LOGGER.debug("node data: {}", dataList);
        this.dataList = dataList;
    } catch (KeeperException | InterruptedException e) {
        LOGGER.error("", e);
    }
}

From source file:com.dinstone.zkclient.core.ZkConnection.java

License:Apache License

public synchronized ZooKeeper getZooKeeper() throws InterruptedException {
    if (this.zooKeeper == null || !zooKeeper.getState().isAlive()) {
        final CountDownLatch connectSingal = new CountDownLatch(1);
        try {/*from w w w.  ja v  a2 s.  c  o m*/
            this.zooKeeper = new ZooKeeper(zkServers, timeout, new Watcher() {

                public void process(WatchedEvent event) {
                    LOG.debug("Received zookeeper event, {}", event.toString());
                    if (event.getPath() == null) {
                        if (KeeperState.SyncConnected == event.getState()) {
                            connectSingal.countDown();
                            fireStateChangedEvent(event.getState());
                        } else if (KeeperState.Disconnected == event.getState()) {
                            fireStateChangedEvent(event.getState());
                        } else if (KeeperState.Expired == event.getState()) {
                            LOG.debug("Session is expired, need to clear process");
                            fireStateChangedEvent(event.getState());
                        }
                    }
                }
            });
        } catch (IOException e) {
            throw new ZkException("connect zookeeper error", e);
        }
        connectSingal.await();
    }

    return this.zooKeeper;
}

From source file:com.dinstone.zkclient.leader.ZookeeperTest.java

License:Apache License

/**
 * @return/*www. j a  v  a  2s  .  co  m*/
 */
private static ZooKeeper getZookeeper() {
    ZooKeeper zooKeeper = null;

    final CountDownLatch connectSingal = new CountDownLatch(1);
    try {
        String quorumServers = "172.21.31.32:2181";
        zooKeeper = new ZooKeeper(quorumServers, 1000, new Watcher() {

            public void process(WatchedEvent event) {
                System.out.println("Received zookeeper event, type={" + event.getType() + "}, state={"
                        + event.getState() + "}, ={" + event.getPath() + "}");

                if (KeeperState.SyncConnected == event.getState()) {
                    connectSingal.countDown();
                } else if (KeeperState.Expired == event.getState()) {
                    System.err.println("Session is expired, need to redo the action");
                }
            }
        });
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        connectSingal.await();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    return zooKeeper;
}

From source file:com.dinstone.zkclient.lock.ZkDistributedLock.java

License:Apache License

private void watch(Proposal prevOffer) throws KeeperException, InterruptedException {
    Stat stat = getZooKeeper().exists(prevOffer.getPath(), new Watcher() {

        public void process(WatchedEvent event) {
            if (event.getType().equals(Watcher.Event.EventType.NodeDeleted)) {
                if (!event.getPath().equals(ZkDistributedLock.this.proposal.getPath())) {
                    eventQueue.add(EventType.Retry);
                }/*from   w ww .j a v a2  s .  c  om*/
            }
        }

    });

    if (stat == null) {
        doLock();
    }
}

From source file:com.discovery.darchrow.ZookeeperClientTest.java

License:Open Source License

public static void main(String[] args) throws Exception {
    // ?// w w  w .j a v a 2s  .  c  om
    ZooKeeper zk = new ZooKeeper("localhost:2181", 30000, new Watcher() {
        // ?
        public void process(WatchedEvent event) {
            System.out.println("?:" + event.getState() + ":" + event.getType() + ":" + event.getWrapper()
                    + ":" + event.getPath());
        }
    });
    // ktv???????
    zk.create(ROOT, "root-ktv".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

    // ??KTV ,       PERSISTENT_SEQUENTIAL  0000000000 ?
    zk.create(ROOT + "/?KTV", "?KTV".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,
            CreateMode.PERSISTENT_SEQUENTIAL);

    // ?,       EPHEMERAL session 
    zk.create(ROOT + "/KTV", "KTV".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);

    // ???EPHEMERAL_SEQUENTIAL  session ?
    zk.create(ROOT + "/KTV-", "KTV-".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,
            CreateMode.EPHEMERAL_SEQUENTIAL);

    // ? ? ktv
    List<String> ktvs = zk.getChildren(ROOT, true);
    System.out.println(Arrays.toString(ktvs.toArray()));
    for (String node : ktvs) {
        // 
        zk.delete(ROOT + "/" + node, -1);
    }
    // ?
    zk.delete(ROOT, -1);
    zk.close();
}

From source file:com.dw.zk.ZkSessionPoller.java

License:Apache License

public static void main(String... args) throws Exception {
    org.apache.log4j.Logger rootLogger = org.apache.log4j.Logger.getRootLogger();
    rootLogger.setLevel(Level.INFO);
    rootLogger.addAppender(new ConsoleAppender(new SimpleLayout()));

    final ZooKeeper zk = new ZooKeeper("172.16.84.129:2181", 2000, new Watcher() {
        @Override/*from   w w w  .j ava 2  s  .c om*/
        public void process(WatchedEvent event) {
            System.out.printf("state=%s\ttype=%s%n", event.getState(), event.getType());
        }
    });

    final CountDownLatch latch = new CountDownLatch(1);

    ZkSessionPoller poller = new ZkSessionPoller(zk, 200, new ConnectionListenerSkeleton() {

        @Override
        public void expired() {
            System.err.println("Session Expired, shutting down.");
            try {
                zk.close();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            latch.countDown();
        }
    });

    poller.startPolling();
    latch.await();
    poller.stopPolling();
}

From source file:com.edmunds.zookeeper.election.ZooKeeperElectionContext.java

License:Apache License

/**
 * Creates a watcher that encapsulates this context.
 *
 * @param zooKeeperElectionContextWatcher
 *         the callback.//from w ww.  ja va2 s .  c  o  m
 * @return the new watcher.
 */
public Watcher createWatcher(final ZooKeeperElectionContextWatcher zooKeeperElectionContextWatcher) {
    return new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            zooKeeperElectionContextWatcher.process(ZooKeeperElectionContext.this, event);
        }
    };
}

From source file:com.example.directorio.ZooKeeperConnection.java

public void connect(String host) throws IOException, InterruptedException {

    zoo = new ZooKeeper(host, 5000, new Watcher() {
        public void process(WatchedEvent we) {

            if (null != we.getState())
                switch (we.getState()) {
                case SyncConnected:
                    connectedSignal.countDown();
                    break;
                case ConnectedReadOnly:
                    System.out.println("Estado solo lectura");
                    break;
                case AuthFailed:
                    System.out.println("Estado Autorizacin fallida");
                    break;
                case Disconnected:
                    System.out.println("Estado Desconectado");
                    break;
                case Expired:
                    System.out.println("Estado expir la sesin");
                    break;
                default:
                    break;
                }/*from   w  w w  . j a  v  a 2  s  . com*/

        }
    });

    connectedSignal.await();
}