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:org.apache.hadoop.hbase.zookeeper.ZKWatcher.java

License:Apache License

/**
 * Method called from ZooKeeper for events and connection status.
 * <p>//www. j a  v  a  2 s . com
 * 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 (ZKListener listener : listeners) {
            listener.nodeCreated(event.getPath());
        }
        break;
    }

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

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

    case NodeChildrenChanged: {
        for (ZKListener listener : listeners) {
            listener.nodeChildrenChanged(event.getPath());
        }
        break;
    }
    default:
        throw new IllegalStateException("Received event is not valid: " + event.getState());
    }
}

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From source file:org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.java

License:Apache License

/**
 * This is the primary ZK watcher//from w  w  w .  ja v a 2s  .  c o  m
 * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.WatchedEvent)
 */
@Override
public synchronized void process(WatchedEvent event) {
    LOG.debug("<" + instanceName + "> Received ZK WatchedEvent: " + "[path=" + event.getPath() + "] "
            + "[state=" + event.getState().toString() + "] " + "[type=" + event.getType().toString() + "]");
    if (event.getType() == EventType.None) {
        if (event.getState() == KeeperState.Expired) {
            this.abort("ZooKeeper Session Expiration, aborting server",
                    new KeeperException.SessionExpiredException());
        } else if (event.getState() == KeeperState.Disconnected) {
            LOG.warn("Disconnected from ZooKeeper");
        } else if (event.getState() == KeeperState.SyncConnected) {
            LOG.info("Reconnected to ZooKeeper");
        }
        return;
    }
    for (Watcher w : listeners) {
        try {
            w.process(event);
        } catch (Throwable t) {
            LOG.error("<" + instanceName + ">" + " Sub-ZK Watcher threw an exception " + "in process()", t);
        }
    }
}

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From source file:org.apache.hadoop.hive.llap.registry.impl.SlotZnode.java

License:Apache License

private void processWatchedEvent(WatchedEvent event) {
    if (event.getType() != EventType.NodeDeleted)
        return;/*from w  w w  . ja  va  2  s  .c  om*/
    String localPath = nodePath.get();
    if (localPath == null)
        return;
    if (!localPath.equals(event.getPath())) {
        LOG.info("Ignoring the NodeDeleted event for " + event.getPath());
        return;
    }
    LOG.info("Trying to reacquire because of the NodeDeleted event");
    startCreateCurrentNode();
}

---

From source file:org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.java

License:Apache License

@VisibleForTesting
@Private/*  ww  w  .  j a va2s. c o  m*/
@Unstable
public synchronized void processWatchEvent(WatchedEvent event) throws Exception {
    Event.EventType eventType = event.getType();
    LOG.info("Watcher event type: " + eventType + " with state:" + event.getState() + " for path:"
            + event.getPath() + " for " + this);

    if (eventType == Event.EventType.None) {

        // the connection state has changed
        switch (event.getState()) {
        case SyncConnected:
            LOG.info("ZKRMStateStore Session connected");
            if (oldZkClient != null) {
                // the SyncConnected must be from the client that sent Disconnected
                zkClient = oldZkClient;
                oldZkClient = null;
                ZKRMStateStore.this.notifyAll();
                LOG.info("ZKRMStateStore Session restored");
            }
            break;
        case Disconnected:
            LOG.info("ZKRMStateStore Session disconnected");
            oldZkClient = zkClient;
            zkClient = null;
            break;
        case Expired:
            // the connection got terminated because of session timeout
            // call listener to reconnect
            LOG.info("ZKRMStateStore Session expired");
            createConnection();
            break;
        default:
            LOG.error("Unexpected Zookeeper" + " watch event state: " + event.getState());
            break;
        }
    }
}

---

From source file:org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.java

License:Apache License

@VisibleForTesting
@Private/*  www . j  av a2s. c o  m*/
@Unstable
public synchronized void processWatchEvent(ZooKeeper zk, WatchedEvent event) throws Exception {
    // only process watcher event from current ZooKeeper Client session.
    if (zk != activeZkClient) {
        LOG.info("Ignore watcher event type: " + event.getType() + " with state:" + event.getState()
                + " for path:" + event.getPath() + " from old session");
        return;
    }

    Event.EventType eventType = event.getType();
    LOG.info("Watcher event type: " + eventType + " with state:" + event.getState() + " for path:"
            + event.getPath() + " for " + this);

    if (eventType == Event.EventType.None) {

        // the connection state has changed
        switch (event.getState()) {
        case SyncConnected:
            LOG.info("ZKRMStateStore Session connected");
            if (zkClient == null) {
                // the SyncConnected must be from the client that sent Disconnected
                zkClient = activeZkClient;
                ZKRMStateStore.this.notifyAll();
                LOG.info("ZKRMStateStore Session restored");
            }
            break;
        case Disconnected:
            LOG.info("ZKRMStateStore Session disconnected");
            zkClient = null;
            break;
        case Expired:
            // the connection got terminated because of session timeout
            // call listener to reconnect
            LOG.info("ZKRMStateStore Session expired");
            createConnection();
            break;
        default:
            LOG.error("Unexpected Zookeeper" + " watch event state: " + event.getState());
            break;
        }
    }
}

---

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());

}

---

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

License:Apache License

/**
 * /*www.j  av a2 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();
    }

}

---

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();/*  w ww  .j  a  v  a2  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();

        // 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 {/* w  w  w. ja  v  a2  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.pulsar.zookeeper.ZooKeeperCache.java

License:Apache License

public <T> void process(WatchedEvent event, final CacheUpdater<T> updater) {
    final String path = event.getPath();
    if (path != null) {
        dataCache.synchronous().invalidate(path);
        childrenCache.invalidate(path);/*w w w .  ja  va 2 s .c om*/
        existsCache.invalidate(path);
        if (executor != null && updater != null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Submitting reload cache task to the executor for path: {}, updater: {}", path,
                        updater);
            }
            try {
                executor.submitOrdered(path, new SafeRunnable() {
                    @Override
                    public void safeRun() {
                        updater.reloadCache(path);
                    }
                });
            } catch (RejectedExecutionException e) {
                // Ok, the service is shutting down
                LOG.error("Failed to updated zk-cache {} on zk-watch {}", path, e.getMessage());
            }
        } else {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Cannot reload cache for path: {}, updater: {}", path, updater);
            }
        }
    }
}

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