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: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  ww .  j  a  v a2  s.c o  m*/
    }

    if (znodeChanged) {

    }

    if (dataChanged) {

    }
}

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From source file:com.flipkart.ranger.finder.ServiceRegistryUpdater.java

License:Apache License

public void start() throws Exception {
    CuratorFramework curatorFramework = serviceRegistry.getService().getCuratorFramework();
    curatorFramework.getChildren().usingWatcher(new CuratorWatcher() {
        @Override//w w  w . jav  a 2  s  . c om
        public void process(WatchedEvent event) throws Exception {
            switch (event.getType()) {

            case NodeChildrenChanged: {
                checkForUpdate();
                break;
            }
            case None:
            case NodeCreated:
            case NodeDeleted:
            case NodeDataChanged:
                break;
            }
        }
    }).forPath(PathBuilder.path(serviceRegistry.getService())); //Start watcher on service node
    serviceRegistry.nodes(checkForUpdateOnZookeeper());
    logger.info("Started polling zookeeper for changes");
}

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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 www  .j a  v a 2s. co  m
    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;
    }
}

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From source file:com.github.zkclient.ZkClient.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();//w  w  w. j  av  a 2s.co  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
            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");
    }
}

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From source file:com.glaf.cluster.catalina.session.ZooKeeperClientImpl.java

License:Apache License

public Set<String> listNodes(final String path, final NodeListChangedListener nodeListChangedListener)
        throws InterruptedException {
    Set<String> res = new HashSet<String>();
    final Watcher watcher = (nodeListChangedListener != null) ? new Watcher() {
        @Override/*from  w w  w.ja  va 2s .  c o m*/
        public void process(WatchedEvent event) {
            if (event.getType() == Watcher.Event.EventType.NodeChildrenChanged) {
                nodeListChangedListener.onNodeListChanged();
            }
        }
    } : null;
    try {
        List<String> children = zooKeeperCall("Cannot list nodes", new Callable<List<String>>() {
            @Override
            public List<String> call() throws Exception {
                return zooKeeper.getChildren(path, watcher);
            }
        });

        if (children == null) {
            return null;
        }
        for (String childPath : children) {
            res.add(extractLastPart(childPath));
        }
        return res;
    } catch (KeeperException e) {
        throw new RuntimeException("Cannot list nodes", e);
    }
}

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From source file:com.glaf.cluster.catalina.session.ZooKeeperClientImpl.java

License:Apache License

private Watcher wrapNodeListener(final NodeListener nodeListener) {
    if (nodeListener != null) {
        return new Watcher() {
            @Override/*from  www  .j a v a 2 s.  c  om*/
            public void process(WatchedEvent event) {
                switch (event.getType()) {
                case NodeCreated:
                    nodeListener.onNodeCreated(event.getPath());
                    break;
                case NodeDeleted:
                    nodeListener.onNodeDeleted(event.getPath());
                    break;
                case NodeDataChanged:
                    nodeListener.onNodeDataChanged(event.getPath());
                    break;
                default:
                    break;
                }
            }
        };
    } else {
        return null;
    }
}

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From source file:com.glaf.core.test.zookeeper.ConfigWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (event.getType() == EventType.NodeDataChanged) {
        try {//from  w  w  w.  j a  v a2 s  .  c om
            displayConfig();
        } catch (InterruptedException e) {
            System.err.println("Interrupted. Exiting.");
            Thread.currentThread().interrupt();
        } catch (KeeperException e) {
            System.err.printf("KeeperException: %s. Exiting.\n", e);
        }
    }
}

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From source file:com.griddynamics.jagger.coordinator.zookeeper.ZookeeperCoordinator.java

License:Open Source License

private <C extends Command<R>, R extends Serializable> void registerExecutor(final NodeContext nodeContext,
        final CommandExecutor<C, R> executor, ZNode node) {
    final ZNode executorNode = node.createChild(znode().withPath(nodeNameOf(executor.getQualifier())));
    final ZNode queueNode = executorNode.createChild(znode().withPath("queue"));
    executorNode.createChild(znode().withPath("result"));

    log.debug("Created znodes for executor {}", executorNode.getPath());

    queueNode.addChildrenWatcher(new Watcher() {
        @Override/*  w  w w .  j  a va  2  s  .  c om*/
        public void process(WatchedEvent event) {
            if (event.getType() != Event.EventType.NodeChildrenChanged) {
                return;
            }

            synchronized (lock) {
                if (log.isDebugEnabled()) {
                    log.debug("Children changed {} event type {}", queueNode.getPath(), event.getType());
                }

                List<QueueEntry<C, R>> entries = getEntries(queueNode, this);

                for (final QueueEntry<C, R> entry : entries) {
                    Runnable run = new Runnable() {

                        @Override
                        public void run() {
                            executeCommand(executor, executorNode, entry, nodeContext);
                        }
                    };

                    ZookeeperCoordinator.this.executor.execute(run);
                }
            }

        }
    });
}

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From source file:com.gxl.shark.resources.watcher.ZookeeperWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (null == zk_client)
        return;// ww  w  . j a va  2s .  com
    try {
        Thread.sleep(100);
        /* ? */
        zk_client.exists(nodePath, this);
        EventType eventType = event.getType();
        final String VALUE = "zookeeper?";
        switch (eventType) {
        case NodeCreated:
            logger.info(VALUE + "[" + event.getPath() + "]");
            break;
        case NodeDataChanged:
            String nodePathValue = new String(zk_client.getData(nodePath, false, null));
            registerBean.register(nodePathValue);
            logger.info(VALUE + "[" + event.getPath() + "]???");
            break;
        case NodeChildrenChanged:
            logger.info(VALUE + "[" + event.getPath() + "]???");
            break;
        case NodeDeleted:
            logger.info(VALUE + "[" + event.getPath() + "]");
        default:
            break;
        }
    } catch (Exception e) {
        throw new ResourceException("zookeeper??[" + e.toString() + "]");
    }
}

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From source file:com.haoocai.jscheduler.client.task.TaskWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    start();/*  w w  w .  ja  v a 2 s  .c o m*/

    if (event.getType() == Event.EventType.NodeDataChanged) {
        try {
            task.run();
        } catch (Exception e) {
            LOG.error("process task error:{}.", e.getMessage(), e);
        } finally {
            zkClient.setData(pathPrefix + "/" + task.name() + "/servers",
                    JvmIdentify.id().getBytes(UTF8_CHARSET));
        }
    } else {
        LOG.error("unexpected event type:{}.", event.getType());
    }
}

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