Example usage for org.apache.zookeeper WatchedEvent getPath

Introduction

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

Prototype

public String getPath() 

Source Link

Usage

From source file:com.splicemachine.ddl.ZooKeeperDDLWatchChecker.java

License:Apache License

@Override
public boolean initialize(final CommunicationListener changeIdListener) throws IOException {

    this.id = zkClient.registerThisServer();
    if (id == null)
        return false; //not a server, so inform the world
    if (id.startsWith("/"))
        id = id.substring(1); //strip the leading / to make sure that we register properly
    changeIdWatcher = new Watcher() {
        @Override/* w ww .  j  a  v  a  2 s.  c  o  m*/
        public void process(WatchedEvent watchedEvent) {
            if (watchedEvent.getType().equals(Event.EventType.NodeChildrenChanged)) {
                if (LOG.isTraceEnabled())
                    LOG.trace("Received watch event, signalling refresh");
                changeIdListener.onCommunicationEvent(watchedEvent.getPath());
            }
        }
    };

    return true;
}

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From source file:com.takin.rpc.zkclient.ZkClient.java

License:Apache License

public void process(WatchedEvent event) {
    logger.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();//from ww  w .j  a va2 s  . c  o m
    try {

        // We might have to install child change event listener if a new node was created
        if (getShutdownTrigger()) {
            logger.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
            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();
        logger.debug("Leaving process event");
    }
}

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From source file:com.taobao.common.tedis.replicator.ZKTest.java

License:Open Source License

@Test
public void testConfig() throws Exception {
    final ZKClient client = new ZKClient("localhost:2181", 500000);
    client.init();//from  www. j a  v  a 2 s .  c o  m

    String path = ZKUtil.contact("tedis", "replicator-config");
    path = ZKUtil.contact(ZKUtil.MUTEXLOCK_ROOT, path);
    path = ZKUtil.normalize(path);

    if (client.useAble()) {
        client.delete(path);

        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
                String path = ZKUtil.contact("tedis", "replicator-config");
                path = ZKUtil.contact(ZKUtil.MUTEXLOCK_ROOT, path);
                path = ZKUtil.normalize(path);
                try {
                    client.rcreate(path, "word".getBytes());
                } catch (ZKException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }).start();

        if (!client.exists(path)) {
            client.rcreate(path, "test".getBytes());
            System.out.println("create path");
        }
        System.out.println(path);
        System.out.println(new String(client.getData(path, new Watcher() {

            @Override
            public void process(WatchedEvent event) {
                System.out.println(event.getPath());
                try {
                    System.out.println(new String(client.getData(event.getPath())));
                } catch (ZKException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        })));

        Thread.sleep(10000);
    }

}

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From source file:com.twitter.distributedlog.impl.ZKLogSegmentMetadataStore.java

License:Apache License

/**
 * Process the watched events for registered listeners
 *//*from   w  w w .  j  ava 2  s .  c  o m*/
@Override
public void process(WatchedEvent event) {
    if (Event.EventType.None == event.getType() && Event.KeeperState.Expired == event.getState()) {
        Set<String> keySet = new HashSet<String>(listeners.keySet());
        for (String logSegmentsPath : keySet) {
            scheduleTask(logSegmentsPath, new ReadLogSegmentsTask(logSegmentsPath, this), 0L);
        }
        return;
    }
    String path = event.getPath();
    if (null == path) {
        return;
    }
    switch (event.getType()) {
    case NodeDeleted:
        listeners.remove(path);
        break;
    case NodeChildrenChanged:
        new ReadLogSegmentsTask(path, this).run();
        break;
    default:
        break;
    }
}

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From source file:com.twitter.distributedlog.lock.ZKSessionLock.java

License:Apache License

private void handleNodeDelete(int lockEpoch, final WatchedEvent event) {
    executeLockAction(lockEpoch, new LockAction() {
        @Override//from   w  w w  .  jav  a  2s  . c  o  m
        public void execute() {
            // The lock is either expired or closed
            if (!lockState.inState(State.WAITING)) {
                LOG.info("{} ignore watched node {} deleted event, since lock state has moved to {}.",
                        new Object[] { lockId, event.getPath(), lockState.getState() });
                return;
            }
            lockState.transition(State.PREPARED);

            // we don't need to wait and check the result, since:
            // 1) if it claimed the ownership, it would notify the waiters when claimed ownerships
            // 2) if it failed, it would also notify the waiters, the waiters would cleanup the state.
            checkLockOwnerAndWaitIfPossible(watcher, true);
        }

        @Override
        public String getActionName() {
            return "handleNodeDelete(path=" + event.getPath() + ")";
        }
    });
}

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From source file:com.twitter.distributedlog.zk.ZKWatcherManager.java

License:Apache License

private void handleChildWatchEvent(WatchedEvent event) {
    String path = event.getPath();
    if (null == path) {
        logger.warn("Received zookeeper watch event with null path : {}", event);
        return;//from   w  w  w . j av a2s  .c om
    }
    Set<Watcher> watchers = childWatches.get(path);
    if (null == watchers) {
        return;
    }
    Set<Watcher> watchersToFire;
    synchronized (watchers) {
        watchersToFire = new HashSet<Watcher>(watchers.size());
        watchersToFire.addAll(watchers);
    }
    for (Watcher watcher : watchersToFire) {
        watcher.process(event);
    }
}

---

From source file:com.twitter.heron.statemgr.zookeeper.ZkWatcherCallback.java

License:Open Source License

public static Watcher makeZkWatcher(final WatchCallback watcher) {
    return watcher == null ? null : new Watcher() {
        @Override/*from   w ww .  j av a  2  s. c  o  m*/
        public void process(WatchedEvent watchedEvent) {
            WatchCallback.WatchEventType watchEventType;
            switch (watchedEvent.getType()) {
            case None:
                watchEventType = WatchCallback.WatchEventType.None;
                break;
            case NodeCreated:
                watchEventType = WatchCallback.WatchEventType.NodeCreated;
                break;
            case NodeDeleted:
                watchEventType = WatchCallback.WatchEventType.NodeDeleted;
                break;
            case NodeDataChanged:
                watchEventType = WatchCallback.WatchEventType.NodeDataChanged;
                break;
            case NodeChildrenChanged:
                watchEventType = WatchCallback.WatchEventType.NodeChildrenChanged;
                break;

            default:
                throw new RuntimeException("Invalid integer value for conversion to EventType");
            }
            watcher.processWatch(watchedEvent.getPath(), watchEventType);
        }
    };
}

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From source file:com.yahoo.pulsar.broker.loadbalance.LeaderElectionService.java

License:Apache License

/**
 * We try to get the data in the ELECTION_ROOT node. If the node is present (i.e. leader is present), we store it in
 * the currentLeader and keep a watch on the election node. If we lose the leader, then watch gets triggered and we
 * do the election again. If the node does not exist while getting the data, we get NoNodeException. This means,
 * there is no leader and we create the node at ELECTION_ROOT and write the leader broker's service URL in the node.
 * Once the leader is known, we call the listener method so that leader can take further actions.
 *//*from w ww .  j a va2s . c  om*/
private void elect() {
    try {
        byte[] data = zkClient.getData(ELECTION_ROOT, new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                log.warn("Type of the event is [{}] and path is [{}]", event.getType(), event.getPath());
                switch (event.getType()) {
                case NodeDeleted:
                    log.warn("Election node {} is deleted, attempting re-election...", event.getPath());
                    if (event.getPath().equals(ELECTION_ROOT)) {
                        log.info("This should call elect again...");
                        executor.execute(new Runnable() {
                            @Override
                            public void run() {
                                // If the node is deleted, attempt the re-election
                                log.info("Broker [{}] is calling re-election from the thread",
                                        pulsar.getWebServiceAddress());
                                elect();
                            }
                        });
                    }
                    break;

                default:
                    log.warn("Got something wrong on watch: {}", event);
                    break;
                }
            }
        }, null);

        LeaderBroker leaderBroker = jsonMapper.readValue(data, LeaderBroker.class);
        currentLeader.set(leaderBroker);
        isLeader.set(false);
        leaderListener.brokerIsAFollowerNow();

        // If broker comes here it is a follower. Do nothing, wait for the watch to trigger
        log.info("Broker [{}] is the follower now. Waiting for the watch to trigger...",
                pulsar.getWebServiceAddress());

    } catch (NoNodeException nne) {
        // There's no leader yet... try to become the leader
        try {
            // Create the root node and add current broker's URL as its contents
            LeaderBroker leaderBroker = new LeaderBroker(pulsar.getWebServiceAddress());
            ZkUtils.createFullPathOptimistic(pulsar.getLocalZkCache().getZooKeeper(), ELECTION_ROOT,
                    jsonMapper.writeValueAsBytes(leaderBroker), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);

            // Update the current leader and set the flag to true
            currentLeader.set(new LeaderBroker(leaderBroker.getServiceUrl()));
            isLeader.set(true);

            // Notify the listener that this broker is now the leader so that it can collect usage and start load
            // manager.
            log.info("Broker [{}] is the leader now, notifying the listener...", pulsar.getWebServiceAddress());
            leaderListener.brokerIsTheLeaderNow();
        } catch (NodeExistsException nee) {
            // Re-elect the new leader
            log.warn(
                    "Got exception [{}] while creating election node because it already exists. Attempting re-election...",
                    nee.getMessage());
            executor.execute(new Runnable() {
                @Override
                public void run() {
                    elect();
                }
            });
        } catch (Exception e) {
            // Kill the broker because this broker's session with zookeeper might be stale. Killing the broker will
            // make sure that we get the fresh zookeeper session.
            log.error("Got exception [{}] while creating the election node", e.getMessage());
            pulsar.getShutdownService().shutdown(-1);
        }

    } catch (Exception e) {
        // Kill the broker
        log.error("Could not get the content of [{}], got exception [{}]. Shutting down the broker...",
                ELECTION_ROOT, e);
        pulsar.getShutdownService().shutdown(-1);
    }
}

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From source file:com.yahoo.pulsar.zookeeper.GlobalZooKeeperCache.java

License:Apache License

@Override
public <T> void process(WatchedEvent event, final CacheUpdater<T> updater) {
    synchronized (this) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("[{}] Got Global ZooKeeper WatchdEvent: EventType: {}, KeeperState: {}, path: {}",
                    this.hashCode(), event.getType(), event.getState(), event.getPath());
        }//from  ww  w.j a  v a2  s.  c  om
        if (event.getType() == Event.EventType.None) {
            switch (event.getState()) {
            case Expired:
                // in case of expired, the zkSession is no longer good for sure.
                // We need to restart the session immediately.
                // cancel any timer event since it is already bad
                ZooKeeper oldSession = this.zkSession.getAndSet(null);
                LOG.warn("Global ZK session lost. Triggering reconnection {}", oldSession);
                safeCloseZkSession(oldSession);
                asyncRestartZooKeeperSession();
                return;
            case SyncConnected:
            case ConnectedReadOnly:
                checkNotNull(zkSession.get());
                LOG.info("Global ZK session {} restored connection.", zkSession.get());

                //
                dataCache.synchronous().invalidateAll();
                childrenCache.invalidateAll();
                return;
            default:
                break;
            }
        }
    }

    // Other types of events
    super.process(event, updater);

}

---

From source file:com.yahoo.pulsar.zookeeper.LocalZooKeeperCache.java

License:Apache License

@Override
public <T> void process(WatchedEvent event, final CacheUpdater<T> updater) {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Got Local ZooKeeper WatchedEvent: EventType: {}, KeeperState: {}, Path: {}", event.getType(),
                event.getState(), event.getPath());
    }//ww  w  .  j av  a2s .c  o  m
    if (event.getType() == Event.EventType.None) {
        switch (event.getState()) {
        case Expired:
            // in case of expired, the zkSession is no longer good
            LOG.warn("Lost connection from local ZK. Invalidating the whole cache.");
            dataCache.synchronous().invalidateAll();
            childrenCache.invalidateAll();
            return;
        default:
            break;
        }
    }
    super.process(event, updater);
}

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