Example usage for org.apache.zookeeper WatchedEvent getType

Introduction

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

Prototype

public EventType getType() 

Source Link

Usage

From source file:org.apache.hama.bsp.sync.ZKSyncBSPMasterClient.java

License:Apache License

@Override
public void process(WatchedEvent arg0) {
    LOG.debug("Processing event " + arg0.getPath());
    LOG.debug("Processing event type " + arg0.getType().toString());

}

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From source file:org.apache.hama.bsp.sync.ZKSyncEventListener.java

License:Apache License

/**
 * /*from ww  w  . j a  v a  2 s  .  com*/
 */
@Override
public void process(WatchedEvent event) {

    client.registerListener(event.getPath(), ZKSyncEventFactory.getValueChangeEvent(), this);
    // if(LOG.isDebugEnabled()){
    LOG.debug(event.toString());
    // }

    if (event.getType().equals(EventType.NodeChildrenChanged)) {
        LOG.debug("Node children changed - " + event.getPath());
        onChildKeySetChange();
    } else if (event.getType().equals(EventType.NodeDeleted)) {
        LOG.debug("Node children deleted - " + event.getPath());
        onDelete();
    } else if (event.getType().equals(EventType.NodeDataChanged)) {
        LOG.debug("Node children changed - " + event.getPath());

        onChange();
    }

}

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From source file:org.apache.helix.manager.zk.zookeeper.ZkClient.java

License:Apache License

@Override
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() == Event.EventType.NodeDataChanged
            || event.getType() == Event.EventType.NodeDeleted || event.getType() == Event.EventType.NodeCreated
            || event.getType() == Event.EventType.NodeChildrenChanged;

    getEventLock().lock();//from ww w . j a v  a  2 s  .c  om
    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();

        // update state change counter.
        recordStateChange(stateChanged, dataChanged);

        LOG.debug("Leaving process event");
    }
}

---

From source file:org.apache.hms.controller.CommandHandler.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    String path = event.getPath();
    LOG.info("Triggered path: " + path);
    if (event.getType() == Event.EventType.NodeChildrenChanged) {
        if (path.equals(CommonConfigurationKeys.ZOOKEEPER_LIVE_CONTROLLER_PATH_DEFAULT)) {
            zk.getChildren(CommonConfigurationKeys.ZOOKEEPER_COMMAND_QUEUE_PATH_DEFAULT, this, this, null);
        } else {//from ww  w.  j  a  v  a  2 s .  c  o m
            zk.getChildren(path, this, this, null);
        }
    } else if (event.getType() == Event.EventType.NodeDataChanged) {
        tasks.add(path);
    }
}

---

From source file:org.apache.hms.controller.Controller.java

License:Apache License

public void process(WatchedEvent event) {
    if (event.getType() == Event.EventType.None) {
        // We are are being told that the state of the
        // connection has changed
        switch (event.getState()) {
        case SyncConnected:
            // In this particular example we don't need to do anything
            // here - watches are automatically re-registered with 
            // server and any watches triggered while the client was 
            // disconnected will be delivered (in order of course)
            break;
        case Expired:
            // It's all over
            running = false;//ww w  . j a  v  a 2  s  .  c om
            commandHandler.stop();
            break;
        }
    }
}

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From source file:org.apache.niolex.zookeeper.watcher.CommonRecoverableWatcher.java

License:Apache License

/**
 * This is the override of super method.
 * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.WatchedEvent)
 *///from ww w .  java 2s .  c om
@Override
public void process(WatchedEvent event) {
    if (type == Type.CHILDREN && event.getType() == Watcher.Event.EventType.NodeChildrenChanged) {
        childrenCHanged();
    } else if (type == Type.DATA && event.getType() == Watcher.Event.EventType.NodeDataChanged) {
        dataChanged();
    }
}

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From source file:org.apache.s4.benchmark.utils.Utils.java

License:Apache License

public static void watchAndSignalChildrenReachedCount(final String path, final CountDownLatch latch,
        final ZooKeeper zk, final int count) throws KeeperException, InterruptedException {

    List<String> children = zk.getChildren(path, new Watcher() {
        @Override/*from   w w w .  ja va 2s  . c o m*/
        public void process(WatchedEvent event) {
            if (EventType.NodeChildrenChanged.equals(event.getType())) {
                try {
                    if (count == zk.getChildren(path, false).size()) {
                        latch.countDown();
                    }
                } catch (KeeperException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                latch.countDown();
            }
        }
    });
    if (children.size() == count) {
        latch.countDown();
    }
}

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From source file:org.apache.s4.fixtures.CommTestUtils.java

License:Apache License

public static void watchAndSignalCreation(String path, final CountDownLatch latch, final ZooKeeper zk,
        boolean deleteIfExists) throws KeeperException, InterruptedException {

    if (zk.exists(path, false) != null) {
        if (deleteIfExists) {
            zk.delete(path, -1);//from  w  ww.jav a2s . c  o m
        } else {
            latch.countDown();
        }
    }
    zk.exists(path, new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (EventType.NodeCreated.equals(event.getType())) {
                latch.countDown();
            }
        }
    });
}

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From source file:org.apache.s4.fixtures.CommTestUtils.java

License:Apache License

public static void watchAndSignalChangedChildren(String path, final CountDownLatch latch, final ZooKeeper zk)
        throws KeeperException, InterruptedException {

    zk.getChildren(path, new Watcher() {
        @Override/*  ww w . j  a va2 s.c  om*/
        public void process(WatchedEvent event) {
            if (EventType.NodeChildrenChanged.equals(event.getType())) {
                latch.countDown();
            }
        }
    });
}

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From source file:org.apache.solr.cloud.LeaderElector.java

License:Apache License

/**
 * Check if the candidate with the given n_* sequence number is the leader.
 * If it is, set the leaderId on the leader zk node. If it is not, start
 * watching the candidate that is in line before this one - if it goes down, check
 * if this candidate is the leader again.
 *
 * @param replacement has someone else been the leader already?
 *///w ww .  j  a v a  2 s.  c  o m
private void checkIfIamLeader(final int seq, final ElectionContext context, boolean replacement)
        throws KeeperException, InterruptedException, IOException {
    // get all other numbers...
    final String holdElectionPath = context.electionPath + ELECTION_NODE;
    List<String> seqs = zkClient.getChildren(holdElectionPath, null, true);

    sortSeqs(seqs);
    List<Integer> intSeqs = getSeqs(seqs);
    if (intSeqs.size() == 0) {
        log.warn("Our node is no longer in line to be leader");
        return;
    }
    if (seq <= intSeqs.get(0)) {
        // first we delete the node advertising the old leader in case the ephem is still there
        try {
            zkClient.delete(context.leaderPath, -1, true);
        } catch (Exception e) {
            // fine
        }

        runIamLeaderProcess(context, replacement);
    } else {
        // I am not the leader - watch the node below me
        int i = 1;
        for (; i < intSeqs.size(); i++) {
            int s = intSeqs.get(i);
            if (seq < s) {
                // we found who we come before - watch the guy in front
                break;
            }
        }
        int index = i - 2;
        if (index < 0) {
            log.warn("Our node is no longer in line to be leader");
            return;
        }
        try {
            zkClient.getData(holdElectionPath + "/" + seqs.get(index), new Watcher() {

                @Override
                public void process(WatchedEvent event) {
                    // session events are not change events,
                    // and do not remove the watcher
                    if (EventType.None.equals(event.getType())) {
                        return;
                    }
                    // am I the next leader?
                    try {
                        checkIfIamLeader(seq, context, true);
                    } catch (InterruptedException e) {
                        // Restore the interrupted status
                        Thread.currentThread().interrupt();
                        log.warn("", e);
                    } catch (IOException e) {
                        log.warn("", e);
                    } catch (Exception e) {
                        log.warn("", e);
                    }
                }

            }, null, true);
        } catch (KeeperException.SessionExpiredException e) {
            throw e;
        } catch (KeeperException e) {
            log.warn("Failed setting watch", e);
            // we couldn't set our watch - the node before us may already be down?
            // we need to check if we are the leader again
            checkIfIamLeader(seq, context, true);
        }
    }
}

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