Example usage for org.apache.zookeeper WatchedEvent getState

Introduction

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

Prototype

public KeeperState getState()

Source Link

Usage

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

License:Apache License

/**
 * Called when the previous node dies, but we still need to check because the previous node may not be the master.
 */// w  w  w .ja v a 2  s.  c  o  m
void processPreviousWatcher(ZooKeeperElectionContext ctx, WatchedEvent event) {
    // Are we still connected?
    final KeeperState connectionState = event.getState();

    if (connectionState == KeeperState.SyncConnected) {
        // Note: I am expecting a NodeDeleted event here.
        //       But, I need to re-establish the watch in all circumstances anyway.

        // We are probably the master, but we need to confirm in case the previous node was not the master.
        listChildren(ctx);
    } else {
        error("Connection lost - Previous watch: " + connectionState, Code.CONNECTIONLOSS, "/", ctx);
        // Can't do anything so just withdraw.
        withdrawInternal(ctx, "Previous Node Connection Lost");
    }
}

From source file:com.edmunds.zookeeper.treewatcher.ZooKeeperTreeWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (event.getState() != Watcher.Event.KeeperState.SyncConnected) {
        unexpectedEventError(event);//from   w w w.j ava  2  s  .co  m
        return;
    }

    processEvent(event, getCurrentState());

    checkStateConsistent();
}

From source file:com.ery.estorm.zk.ZooKeeperWatcher.java

License:Apache License

/**
 * Method called from ZooKeeper for events and connection status.
 * <p>/*from  www .ja  v  a  2  s  . c om*/
 * Valid events are passed along to listeners. Connection status changes are
 * dealt with locally.
 */
@Override
public void process(WatchedEvent event) {

    String path = event.getPath();
    if (path != null || EventType.NodeDeleted == event.getType()) {
        try {
            ZKUtil.watchAndCheckExists(this, path);
        } catch (KeeperException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    LOG.debug(prefix("Received ZooKeeper Event, " + "type=" + event.getType() + ", " + "state="
            + event.getState() + ", " + "path=" + path));
    switch (event.getType()) {

    // If event type is NONE, this is a connection status change
    case None: {
        connectionEvent(event);
        break;
    }

    // Otherwise pass along to the listeners

    case NodeCreated: {
        for (ZooKeeperListener listener : listeners) {
            listener.nodeCreated(path);
        }
        break;
    }

    case NodeDeleted: {
        for (ZooKeeperListener listener : listeners) {
            listener.nodeDeleted(path);
        }
        break;
    }

    case NodeDataChanged: {
        for (ZooKeeperListener listener : listeners) {
            listener.nodeDataChanged(path);
        }
        break;
    }

    case NodeChildrenChanged: {
        for (ZooKeeperListener listener : listeners) {
            listener.nodeChildrenChanged(path);
        }
        break;
    }
    }
}

From source file:com.ery.estorm.zk.ZooKeeperWatcher.java

License:Apache License

/**
 * Called when there is a connection-related event via the Watcher callback.
 * <p>/*from  w w w . j  a v a 2  s .  c  o  m*/
 * If Disconnected or Expired, this should shutdown the cluster. But, since
 * we send a KeeperException.SessionExpiredException along with the abort
 * call, it's possible for the Abortable to catch it and try to create a new
 * session with ZooKeeper. This is what the client does in HCM.
 * <p>
 * 
 * @param event
 */
private void connectionEvent(WatchedEvent event) {
    switch (event.getState()) {
    case SyncConnected:
        // Now, this callback can be invoked before the this.zookeeper is
        // set.
        // Wait a little while.
        long finished = System.currentTimeMillis()
                + this.conf.getLong("hbase.zookeeper.watcher.sync.connected.wait", 2000);
        while (System.currentTimeMillis() < finished) {
            Threads.sleep(1);
            if (this.recoverableZooKeeper != null)
                break;
        }
        if (this.recoverableZooKeeper == null) {
            LOG.error(
                    "ZK is null on connection event -- see stack trace "
                            + "for the stack trace when constructor was called on this zkw",
                    this.constructorCaller);
            throw new NullPointerException("ZK is null");
        }
        this.identifier = this.identifier + "-0x" + Long.toHexString(this.recoverableZooKeeper.getSessionId());
        // Update our identifier. Otherwise ignore.
        LOG.debug(this.identifier + " connected");
        break;

    // Abort the server if Disconnected or Expired
    case Disconnected:
        LOG.debug(prefix("Received Disconnected from ZooKeeper, ignoring"));
        break;

    case Expired:
        String msg = prefix(this.identifier + " received expired from " + "ZooKeeper, aborting");
        // TODO: One thought is to add call to ZooKeeperListener so say,
        // ZooKeeperNodeTracker can zero out its data values.
        if (this.abortable != null) {
            this.abortable.abort(msg, new KeeperException.SessionExpiredException());
        }
        break;

    case ConnectedReadOnly:
    case SaslAuthenticated:
        break;

    default:
        throw new IllegalStateException("Received event is not valid: " + event.getState());
    }
}

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;
                }// w  w  w. jav  a  2s. com

        }
    });

    connectedSignal.await();
}

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

public String getData(String path2) throws InterruptedException, KeeperException, UnsupportedEncodingException {
    final String path = path2;
    Stat stat = znode_exists(path);//from   w w w .  j  a v  a  2s .c  om

    byte[] b = null;
    if (stat != null) {
        b = zk.getData(path, new Watcher() {
            public void process(WatchedEvent we) {
                if (we.getType() == Event.EventType.None) {
                    switch (we.getState()) {
                    case Expired:
                        zkConnection.getConnectedSignal().countDown();
                        break;
                    }

                } else {
                    try {
                        byte[] bn = zk.getData(path, false, null);
                        String data = new String(bn, "UTF-8");
                        System.out.println(data);
                        zkConnection.getConnectedSignal().countDown();

                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                }
            }
        }, null);

        String data = new String(b, "UTF-8");
        //System.out.println(data);
        zkConnection.getConnectedSignal().await();

    } else {
        System.out.println("Node does not exists");
    }
    return new String(b);
}

From source file:com.facebook.zookeeper.convenience.ZkQuickConnection.java

License:Apache License

private ZkQuickConnection(ZooKeeperFactory zooKeeperFactory, int connectionTimeoutMillis)
        throws IOException, InterruptedException, TimeoutException {
    final CountDownLatch latch = new CountDownLatch(1);
    zk = zooKeeperFactory.create(new Watcher() {
        @Override/*from   w  w w.  j  a va 2 s .  com*/
        public void process(WatchedEvent event) {
            if (event.getState() == Watcher.Event.KeeperState.SyncConnected) {
                latch.countDown();
            }
        }
    });
    if (!latch.await(connectionTimeoutMillis, TimeUnit.MILLISECONDS)) {
        zk.close();
        throw new TimeoutException("Failed to connect to ZooKeeper");
    }
}

From source file:com.fjn.helper.frameworkex.apache.zookeeper.dispatcher.Dispatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    event.getPath();
    event.getState();
    event.getType();

}

From source file:com.fjn.helper.frameworkex.apache.zookeeper.dispatcher.Dispatcher.java

License:Apache License

void accept(WatchedEvent event) {
    boolean stateChanged = event.getPath() == null;
    boolean znodeChanged = event.getPath() != null;
    boolean dataChanged = event.getType() == EventType.NodeDataChanged
            || event.getType() == EventType.NodeDeleted || event.getType() == EventType.NodeCreated
            || event.getType() == EventType.NodeChildrenChanged;

    if (stateChanged) {
        if (event.getState() == KeeperState.Expired) {
            selector.addEvent(new Event(ServiceType.SESSION, new SourceWrapper(event)));
        }/*from  w  w w.  j  ava  2s .co  m*/
    }

    if (znodeChanged) {

    }

    if (dataChanged) {

    }
}

From source file:com.github.liyp.zk.demo.ZkElector.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    logger.info("ZK path ,state , type: {}",
            event.getPath() + " " + event.getState() + " " + event.getType() + "    #" + zookeeper.hashCode());
    switch (event.getType()) {
    case NodeChildrenChanged:
    case NodeCreated:
    case NodeDataChanged:
        break;//from ww  w . ja  v a  2s. c om
    case NodeDeleted:
        try {
            newLeaderElection();
        } catch (KeeperException | InterruptedException e) {
            logger.error("New leader election failed.", e);
        }
        break;
    case None:
        switch (event.getState()) {
        case Disconnected:
            logger.info("ZK path {} Disconnected.", event.getPath());
            break;
        case Expired:
            logger.info("ZK path {} Expired.", event.getPath());

            taskServer.shutdown();
            try {
                this.zookeeper = new ZooKeeper(zkAddress, zkTimeout, this);
                elected.set(true);
            } catch (IOException e) {
                logger.info("{}", this.hashCode(), e);
            }
            break;
        case SyncConnected:
            logger.info("ZK path {} SyncConnected.", event.getPath());
            try {
                if (elected.get()) {
                    leaderElection();
                    elected.set(false);
                }
            } catch (KeeperException | InterruptedException e) {
                logger.error("ZK path rebuild error.", e);
            } catch (Exception e) {
                logger.info("{}", this.hashCode(), e);
            }
            break;
        default:
            logger.info("ZK path {}, state {}", event.getPath(), event.getState());
            break;
        }
        break;
    }
}