Example usage for org.apache.zookeeper WatchedEvent WatchedEvent

List of usage examples for org.apache.zookeeper WatchedEvent WatchedEvent

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Introduction

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

Prototype

public WatchedEvent(EventType eventType, KeeperState keeperState, String path)

Source Link

Document

Create a WatchedEvent with specified type, state and path

Usage

From source file:com.bigdata.zookeeper.HierarchicalZNodeWatcher.java

License:Open Source License

/**
 * This is used pump mock events into the {@link #queue} during startup.
 * /*from w  w  w .jav a 2  s  .c o  m*/
 * @param path
 * @param flags
 */
protected void placeMockEventInQueue(final String path, final int flags) {

    if (!pumpMockEvents) {

        /*
         * Note: If we are receiving real events then we don't want to do
         * this. It is just for producing fake events during startup.
         */

        throw new IllegalStateException();

    }

    if (log.isInfoEnabled())
        log.info("path=" + path + ", flags=" + flagString(flags));

    if ((flags & EXISTS) != 0) {

        queue.add(new WatchedEvent(Event.EventType.NodeCreated, Event.KeeperState.Unknown, path));

    }

    if ((flags & DATA) != 0) {

        queue.add(new WatchedEvent(Event.EventType.NodeDataChanged, Event.KeeperState.Unknown, path));

    }

    if ((flags & CHILDREN) != 0) {

        queue.add(new MockWatchedEvent(Event.EventType.NodeChildrenChanged, Event.KeeperState.Unknown, path));

    }

}

From source file:com.continuuity.weave.internal.zookeeper.RewatchOnExpireWatcher.java

License:Open Source License

private void exists() {
    Futures.addCallback(client.exists(path, this), new FutureCallback<Stat>() {
        @Override//from w w w. j a v a  2s  . c  o m
        public void onSuccess(Stat stat) {
            // Since we know all callbacks and watcher are triggered from single event thread, there is no race condition.
            Object oldResult = lastResult.getReference();
            lastResult.compareAndSet(oldResult, null, true, false);

            if (stat != oldResult && (stat == null || !stat.equals(oldResult))) {
                if (stat == null) {
                    // previous stat is not null, means node deleted
                    process(new WatchedEvent(Event.EventType.NodeDeleted, Event.KeeperState.SyncConnected,
                            path));
                } else if (oldResult == null) {
                    // previous stat is null, means node created
                    process(new WatchedEvent(Event.EventType.NodeCreated, Event.KeeperState.SyncConnected,
                            path));
                } else {
                    // Otherwise, something changed on the node
                    process(new WatchedEvent(Event.EventType.NodeDataChanged, Event.KeeperState.SyncConnected,
                            path));
                }
            }
        }

        @Override
        public void onFailure(Throwable t) {
            if (RetryUtils.canRetry(t)) {
                exists();
            } else {
                lastResult.set(null, false);
                LOG.error("Fail to re-set watch on exists for path " + path, t);
            }
        }
    });
}

From source file:com.continuuity.weave.internal.zookeeper.RewatchOnExpireWatcher.java

License:Open Source License

private void children() {
    Futures.addCallback(client.getChildren(path, this), new FutureCallback<NodeChildren>() {
        @Override//  ww w.j  av a 2  s .co m
        public void onSuccess(NodeChildren result) {
            Object oldResult = lastResult.getReference();
            lastResult.compareAndSet(oldResult, null, true, false);

            if (result.equals(oldResult)) {
                return;
            }

            if (!(oldResult instanceof NodeChildren)) {
                // Something very wrong
                LOG.error("The same watcher has been used for different event type.");
                return;
            }

            NodeChildren oldNodeChildren = (NodeChildren) oldResult;
            if (!result.getChildren().equals(oldNodeChildren.getChildren())) {
                process(new WatchedEvent(Event.EventType.NodeChildrenChanged, Event.KeeperState.SyncConnected,
                        path));
            } else {
                process(new WatchedEvent(Event.EventType.NodeDataChanged, Event.KeeperState.SyncConnected,
                        path));
            }
        }

        @Override
        public void onFailure(Throwable t) {
            if (RetryUtils.canRetry(t)) {
                children();
                return;
            }

            lastResult.set(null, false);
            if (t instanceof KeeperException) {
                KeeperException.Code code = ((KeeperException) t).code();
                if (code == KeeperException.Code.NONODE) {
                    // Node deleted
                    process(new WatchedEvent(Event.EventType.NodeDeleted, Event.KeeperState.SyncConnected,
                            path));
                    return;
                }
            }
            LOG.error("Fail to re-set watch on getChildren for path " + path, t);
        }
    });
}

From source file:com.continuuity.weave.internal.zookeeper.RewatchOnExpireWatcher.java

License:Open Source License

private void data() {
    Futures.addCallback(client.getData(path, this), new FutureCallback<NodeData>() {
        @Override//w w  w  .j a va 2  s .c o  m
        public void onSuccess(NodeData result) {
            Object oldResult = lastResult.getReference();
            lastResult.compareAndSet(oldResult, null, true, false);

            if (!result.equals(oldResult)) {
                // Whenever something changed, treated it as data changed.
                process(new WatchedEvent(Event.EventType.NodeDataChanged, Event.KeeperState.SyncConnected,
                        path));
            }
        }

        @Override
        public void onFailure(Throwable t) {
            if (RetryUtils.canRetry(t)) {
                data();
                return;
            }

            lastResult.set(null, false);
            if (t instanceof KeeperException) {
                KeeperException.Code code = ((KeeperException) t).code();
                if (code == KeeperException.Code.NONODE) {
                    // Node deleted
                    process(new WatchedEvent(Event.EventType.NodeDeleted, Event.KeeperState.SyncConnected,
                            path));
                    return;
                }
            }
            LOG.error("Fail to re-set watch on getData for path " + path, t);
        }
    });
}

From source file:com.facebook.zookeeper.mock.MockZooKeeper.java

License:Apache License

public synchronized void triggerConnect() {
    state = ZooKeeper.States.CONNECTED;//  w  w w . j av  a2 s  .  c o  m
    WatchedEvent watchedEvent = new WatchedEvent(EventType.None, KeeperState.SyncConnected, null);
    dataStore.signalSessionEvent(sessionId, watchedEvent);
    defaultWatcher.process(watchedEvent);
}

From source file:com.facebook.zookeeper.mock.MockZooKeeper.java

License:Apache License

public synchronized void triggerDisconnect() {
    state = ZooKeeper.States.CONNECTING;
    WatchedEvent watchedEvent = new WatchedEvent(EventType.None, KeeperState.Disconnected, null);
    dataStore.signalSessionEvent(sessionId, watchedEvent);
    defaultWatcher.process(watchedEvent);
}

From source file:com.facebook.zookeeper.mock.MockZooKeeper.java

License:Apache License

public synchronized void triggerSessionExpiration() {
    state = ZooKeeper.States.CLOSED;/*from   ww  w  . ja  v  a2 s  .co  m*/
    WatchedEvent watchedEvent = new WatchedEvent(EventType.None, KeeperState.Expired, null);
    dataStore.signalSessionEvent(sessionId, watchedEvent);
    defaultWatcher.process(watchedEvent);
    dataStore.clearSession(sessionId);
}

From source file:com.facebook.zookeeper.mock.MockZooKeeperDataStore.java

License:Apache License

public synchronized String create(long sessionId, String path, byte[] data, List<ACL> acl,
        CreateMode createMode) throws KeeperException {
    if (isRootPath(path)) {
        throw new KeeperException.NodeExistsException(path);
    }//w  ww  .ja  v  a2s  . co m
    String relativePath = stripRootFromPath(path);
    String relativeChildPath = root.createDescendant(sessionId, relativePath, data, acl, createMode);
    String absChildPath = addRootToPath(relativeChildPath);

    // Trigger any creation watches that may exist
    if (creationWatchers.containsKey(absChildPath)) {
        WatchedEvent watchedEvent = new WatchedEvent(EventType.NodeCreated, KeeperState.SyncConnected,
                absChildPath);
        for (Watcher watcher : creationWatchers.get(absChildPath)) {
            watcher.process(watchedEvent);
        }
        creationWatchers.remove(absChildPath);
    }
    return absChildPath;
}

From source file:com.netflix.curator.x.zkclientbridge.CuratorZKClientBridge.java

License:Apache License

@Override
public void connect(final Watcher watcher) {
    if (watcher != null) {
        CuratorListener localListener = new CuratorListener() {
            @Override//from w  w w . j a v  a2s  .  c om
            public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception {
                if (event.getWatchedEvent() != null) {
                    watcher.process(event.getWatchedEvent());
                }
            }
        };
        curator.getCuratorListenable().addListener(localListener);
        listener.set(localListener);

        try {
            BackgroundCallback callback = new BackgroundCallback() {
                @Override
                public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                    WatchedEvent fakeEvent = new WatchedEvent(Watcher.Event.EventType.None,
                            curator.getZookeeperClient().isConnected() ? Watcher.Event.KeeperState.SyncConnected
                                    : Watcher.Event.KeeperState.Disconnected,
                            null);
                    watcher.process(fakeEvent);
                }
            };
            curator.checkExists().inBackground(callback).forPath("/foo");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

From source file:com.talis.platform.sequencing.zookeeper.ZooKeeperProviderTest.java

License:Apache License

@Test
public void waitForConnectedEventBeforeReturningInstance() throws Exception {
    ensureServerStopped(DEFAULT_HOST_PORT);
    final ZooKeeperProvider provider = new ZooKeeperProvider();
    final long waitPeriod = 300;
    Callable<Long> requester = new Callable<Long>() {
        @Override//from   w w w .j a  v a2 s.  c  o m
        public Long call() throws ZooKeeperInitialisationException {
            try {
                long time1 = System.currentTimeMillis();
                provider.get();
                long time2 = System.currentTimeMillis();
                return (time2 - time1);
            } catch (ZooKeeperInitialisationException e) {
                e.printStackTrace();
                fail("Caught unexpected exception");
                throw e;
            }
        }
    };
    ExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    Future<Long> future = executor.submit(requester);

    WatchedEvent connectedEvent = new WatchedEvent(Watcher.Event.EventType.None,
            Watcher.Event.KeeperState.SyncConnected, null);
    Thread.sleep(waitPeriod + 10);
    provider.process(connectedEvent);
    Long fetchTime = future.get();
    assertTrue(fetchTime >= waitPeriod);
}