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:blazingcache.zookeeper.ZKCacheServerLocator.java

License:Apache License

@Override
protected ServerHostData getServer() {

    String leaderPath = basePath + "/leader";
    try {// ww w .  j  av a 2  s .c  o m
        byte[] data;
        if (ownedZk) {
            CountDownLatch connection = new CountDownLatch(1);
            try {
                LOGGER.finest("creating temp ZK client for discovery");
                ZooKeeper client = new ZooKeeper(zkAddress, zkSessiontimeout, new Watcher() {

                    @Override
                    public void process(WatchedEvent event) {
                        if (event.getState() == Event.KeeperState.SyncConnected
                                || event.getState() == Event.KeeperState.ConnectedReadOnly) {
                            connection.countDown();
                        }
                        LOGGER.severe("process ZK event " + event.getState() + " " + event.getType() + " "
                                + event.getPath());
                    }
                });
                try {
                    connection.await(connectTimeout, TimeUnit.MILLISECONDS);
                    LOGGER.finest("ZK client is " + client);
                    // se la connessione non sar stabilita in tempo o c' qualche problem troveremo un ConnectionLoss ad esempio                                        
                    data = client.getData(leaderPath, false, null);
                } finally {
                    client.close();
                }
            } catch (IOException err) {
                LOGGER.log(Level.SEVERE, "zookeeper client not available: " + err);
                return null;
            }

        } else {
            ZooKeeper client = zkSupplier.get();
            if (client == null) {
                LOGGER.log(Level.SEVERE, "zookeeper client available");
                return null;
            }
            data = client.getData(leaderPath, false, null);
        }
        lastKnownServer = ServerHostData.parseHostdata(data);
        return lastKnownServer;
    } catch (KeeperException.NoNodeException nobroker) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", nobroker);
        return null;
    } catch (KeeperException | InterruptedException err) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", err);
        return null;
    }
}

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From source file:cn.lhfei.zookeeper.ConnectionWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (event.getState() == KeeperState.SyncConnected) {
        connectedSignal.countDown();/*from  w  w  w  . j a  va  2  s .co  m*/
    }
}

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From source file:co.cask.tephra.distributed.ThriftTransactionServerTest.java

License:Apache License

private void expireZkSession(ZKClientService zkClientService) throws Exception {
    ZooKeeper zooKeeper = zkClientService.getZooKeeperSupplier().get();
    final SettableFuture<?> connectFuture = SettableFuture.create();
    Watcher watcher = new Watcher() {
        @Override/* w  ww  . j a v  a 2 s .c  o m*/
        public void process(WatchedEvent event) {
            if (event.getState() == Event.KeeperState.SyncConnected) {
                connectFuture.set(null);
            }
        }
    };

    // Create another Zookeeper session with the same sessionId so that the original one expires.
    final ZooKeeper dupZookeeper = new ZooKeeper(zkClientService.getConnectString(),
            zooKeeper.getSessionTimeout(), watcher, zooKeeper.getSessionId(), zooKeeper.getSessionPasswd());
    connectFuture.get(30, TimeUnit.SECONDS);
    Assert.assertEquals("Failed to re-create current session", dupZookeeper.getState(),
            ZooKeeper.States.CONNECTED);
    dupZookeeper.close();
}

---

From source file:co.cask.tephra.zookeeper.TephraZKClientService.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    State state = state();/*w  ww .j  a  va 2  s  . c  om*/
    if (state == State.TERMINATED || state == State.FAILED) {
        return;
    }

    try {
        if (event.getState() == Event.KeeperState.SyncConnected && state == State.STARTING) {
            LOG.debug("Connected to ZooKeeper: {}", zkStr);
            notifyStarted();
            return;
        }
        if (event.getState() == Event.KeeperState.Expired) {
            LOG.info("ZooKeeper session expired: {}", zkStr);

            // When connection expired, simply reconnect again
            if (state != State.RUNNING) {
                return;
            }
            eventExecutor.submit(new Runnable() {
                @Override
                public void run() {
                    // Only reconnect if the current state is running
                    if (state() != State.RUNNING) {
                        return;
                    }
                    try {
                        LOG.info("Reconnect to ZooKeeper due to expiration: {}", zkStr);
                        closeZooKeeper(zooKeeper.getAndSet(createZooKeeper()));
                    } catch (IOException e) {
                        notifyFailed(e);
                    }
                }
            });
        }
    } finally {
        if (event.getType() == Event.EventType.None) {
            for (Watcher connectionWatcher : connectionWatchers) {
                connectionWatcher.process(event);
            }
        }
    }
}

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From source file:com.alibaba.jstorm.zk.Zookeeper.java

License:Apache License

/**
 * connect ZK, register Watch/unhandle Watch
 * //from ww w.  j a  v  a2s .  c  om
 * @return
 */
public CuratorFramework mkClient(Map conf, List<String> servers, Object port, String root,
        final WatcherCallBack watcher) {

    CuratorFramework fk = Utils.newCurator(conf, servers, port, root);

    fk.getCuratorListenable().addListener(new CuratorListener() {
        @Override
        public void eventReceived(CuratorFramework _fk, CuratorEvent e) throws Exception {
            if (e.getType().equals(CuratorEventType.WATCHED)) {
                WatchedEvent event = e.getWatchedEvent();

                watcher.execute(event.getState(), event.getType(), event.getPath());
            }

        }
    });

    fk.getUnhandledErrorListenable().addListener(new UnhandledErrorListener() {
        @Override
        public void unhandledError(String msg, Throwable error) {
            String errmsg = "Unrecoverable Zookeeper error, halting process: " + msg;
            LOG.error(errmsg, error);
            JStormUtils.halt_process(1, "Unrecoverable Zookeeper error");

        }
    });
    fk.start();
    return fk;
}

---

From source file:com.alibaba.otter.shared.common.utils.zookeeper.ZkClientx.java

License:Apache License

public void process(WatchedEvent event) {
    LOG.debug("Received event: " + event);
    _zookeeperEventThread = Thread.currentThread();

    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;

    getEventLock().lock();/*  ww w.j av  a  2  s.c o  m*/
    try {

        // We might have to install child change event listener if a new node was created
        if (getShutdownTrigger()) {
            LOG.debug("ignoring event '{" + event.getType() + " | " + event.getPath()
                    + "}' since shutdown triggered");
            return;
        }
        if (stateChanged) {
            processStateChanged(event);
        }
        if (dataChanged) {
            processDataOrChildChange(event);
        }
    } finally {
        if (stateChanged) {
            getEventLock().getStateChangedCondition().signalAll();

            // If the session expired we have to signal all conditions, because watches might have been removed and
            // there is no guarantee that those
            // conditions will be signaled at all after an Expired event
            // TODO PVo write a test for this
            if (event.getState() == KeeperState.Expired) {
                getEventLock().getZNodeEventCondition().signalAll();
                getEventLock().getDataChangedCondition().signalAll();
                // We also have to notify all listeners that something might have changed
                fireAllEvents();
            }
        }
        if (znodeChanged) {
            getEventLock().getZNodeEventCondition().signalAll();
        }
        if (dataChanged) {
            getEventLock().getDataChangedCondition().signalAll();
        }
        getEventLock().unlock();
        LOG.debug("Leaving process event");
    }
}

---

From source file:com.alibaba.otter.shared.common.utils.zookeeper.ZkClientx.java

License:Apache License

private void processStateChanged(WatchedEvent event) {
    LOG.info("zookeeper state changed (" + event.getState() + ")");
    setCurrentState(event.getState());//from ww w .  ja  va  2  s  .co m
    if (getShutdownTrigger()) {
        return;
    }
    try {
        fireStateChangedEvent(event.getState());

        if (event.getState() == KeeperState.Expired) {
            reconnect();
            fireNewSessionEvents();
        }
    } catch (final Exception e) {
        throw new RuntimeException("Exception while restarting zk client", e);
    }
}

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From source file:com.alibaba.wasp.zookeeper.ZooKeeperWatcher.java

License:Apache License

/**
 * Method called from ZooKeeper for events and connection status.
 * <p>//www  .  jav  a  2s . co m
 * Valid events are passed along to listeners. Connection status changes are
 * dealt with locally.
 */
@Override
public void process(WatchedEvent event) {
    LOG.debug(prefix("Received ZooKeeper Event, " + "type=" + event.getType() + ", " + "state="
            + event.getState() + ", " + "path=" + event.getPath()));

    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(event.getPath());
        }
        break;
    }

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

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

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

---

From source file:com.alibaba.wasp.zookeeper.ZooKeeperWatcher.java

License:Apache License

/**
 * Called when there is a connection-related event via the Watcher callback.
 * <p>/*  w  w w.  ja  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;

    case AuthFailed:
        if (ZKUtil.isSecureZooKeeper(this.conf)) {
            // We could not be authenticated, but clients should proceed anyway.
            // Only access to znodes that require SASL authentication will be
            // denied. The client may never need to access them.
            saslLatch.countDown();
        }
        break;

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

    case Expired:
        if (ZKUtil.isSecureZooKeeper(this.conf)) {
            // We consider Expired equivalent to AuthFailed for this
            // connection. Authentication is never going to complete. The
            // client should proceed to do cleanup.
            saslLatch.countDown();
        }
        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;

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

---

From source file:com.andyadc.menagerie.DefaultZkSessionManager.java

License:Apache License

private void notifyListeners(WatchedEvent event) {
    notifyState(event.getState());
}

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