Example usage for org.apache.zookeeper Watcher Watcher

Introduction

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

Prototype

Watcher

Source Link

Usage

From source file:com.jbrisbin.vpc.zk.GroovyZooKeeperHelper.java

License:Apache License

/**
 * Get a node's data and set a watch./*from www . j a  v a2s  . c o  m*/
 *
 * @param path
 * @param watcher
 * @param stat
 * @return
 * @throws InterruptedException
 * @throws KeeperException
 */
public Object getData(Object path, final Closure watcher, Stat stat)
        throws InterruptedException, KeeperException {
    return deserialize(zookeeper.getData(getPathAsString(path), new Watcher() {
        public void process(WatchedEvent event) {
            watcher.call(event);
        }
    }, stat));
}

---

From source file:com.jkoolcloud.tnt4j.streams.configure.zookeeper.ZKConfigManager.java

License:Apache License

/**
 * Initializes ZK ensemble node data monitoring (over {@link org.apache.zookeeper.Watcher}) and initial data
 * loading./*from   w w  w. java  2s.  c om*/
 * 
 * @param zk
 *            ZooKeeper instance
 * @param path
 *            node path
 * @param zkCfgChangeListener
 *            zookeeper node data change listener instance
 */
public static void handleZKStoredConfiguration(final ZooKeeper zk, final String path,
        final ZKConfigChangeListener zkCfgChangeListener) {
    Watcher watch = new Watcher() {
        @Override
        public void process(WatchedEvent watchedEvent) {
            if (path.equals(watchedEvent.getPath())) {
                if (watchedEvent.getType() == Event.EventType.NodeDataChanged) {
                    LOGGER.log(OpLevel.DEBUG, StreamsResources.getString(StreamsResources.RESOURCE_BUNDLE_NAME,
                            "ZKConfigManager.node.changed"), path);
                    zkCfgChangeListener.reconfigure(zk, path, this);
                } else if (watchedEvent.getType() == Event.EventType.NodeDeleted) {
                    LOGGER.log(OpLevel.DEBUG, StreamsResources.getString(StreamsResources.RESOURCE_BUNDLE_NAME,
                            "ZKConfigManager.node.deleted"), path);
                    zk.exists(path, this, null, null);
                } else if (watchedEvent.getType() == Event.EventType.NodeCreated) {
                    LOGGER.log(OpLevel.DEBUG, StreamsResources.getString(StreamsResources.RESOURCE_BUNDLE_NAME,
                            "ZKConfigManager.node.created"), path);
                    zkCfgChangeListener.reconfigure(zk, path, this);
                }
            }
        }
    };

    Stat nStat = null;

    try {
        nStat = zk.exists(path, false);
    } catch (Exception exc) {
        LOGGER.log(OpLevel.WARNING, StreamsResources.getString(StreamsResources.RESOURCE_BUNDLE_NAME,
                "ZKConfigManager.node.exists.failed"), path, exc);
    }

    if (nStat == null) {
        LOGGER.log(OpLevel.DEBUG, StreamsResources.getString(StreamsResources.RESOURCE_BUNDLE_NAME,
                "ZKConfigManager.node.create.wait"), path);
        zk.exists(path, watch, null, null);
    } else {
        zkCfgChangeListener.reconfigure(zk, path, watch);
    }
}

---

From source file:com.jkoolcloud.tnt4j.streams.configure.zookeeper.ZKConnection.java

License:Apache License

/**
 * Connects to ZooKeeper ensemble. Waits until connection establishment is confirmed over watcher.
 *
 * @param connStr//  ww w.  j a  v  a2s.  co m
 *            ZooKeeper ensemble connection definition string
 * @param timeout
 *            connection timeout
 * @return zookeeper instance
 * 
 * @throws IOException
 *             if I/O exception occurs while initializing ZooKeeper connection
 * @throws InterruptedException
 *             if the current thread is interrupted while waiting
 */
public ZooKeeper connect(String connStr, int timeout) throws IOException, InterruptedException {
    final CountDownLatch connectedSignal = new CountDownLatch(1);
    zk = new ZooKeeper(connStr, timeout, new Watcher() {
        @Override
        public void process(WatchedEvent we) {
            if (we.getState() == Event.KeeperState.SyncConnected) {
                connectedSignal.countDown();
            }
        }
    });

    connectedSignal.await();
    return zk;
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithExistWatch() throws InterruptedException, ExecutionException {
    final CountDownLatch latch = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.StatCallback existCallback = new AsyncCallback.StatCallback() {
        @Override/*from w ww  . j a va2s  .c o  m*/
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            latch.countDown();
        }
    };
    Watcher existWatch = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeCreated);
            _zkClient.getZooKeeper().exists(event.getPath(), null, existCallback, null);
        }
    };
    AsyncCallback.StatCallback existCallback2 = new AsyncCallback.StatCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.NONODE);
            latch2.countDown();
        }
    };
    // symlink: /foo/$link/newNode -> /foo/bar/newNode
    _zkClient.getZooKeeper().exists("/foo/$link/newNode", existWatch, existCallback2, null);
    latch2.await(30, TimeUnit.SECONDS);
    _zkClient.ensurePersistentNodeExists("/foo/bar/newNode", new FutureCallback<None>());
    latch.await(30, TimeUnit.SECONDS);
    _zkClient.removeNodeUnsafe("/foo/bar/newNode", new FutureCallback<None>());
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithExistWatch2() throws InterruptedException, ExecutionException {
    final CountDownLatch latch = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.StatCallback existCallback = new AsyncCallback.StatCallback() {
        @Override/*from ww  w  . ja  v  a2 s.c  om*/
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            latch.countDown();
        }
    };
    Watcher existWatch = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeDataChanged);
            _zkClient.getZooKeeper().exists(event.getPath(), null, existCallback, null);
        }
    };
    AsyncCallback.StatCallback existCallback2 = new AsyncCallback.StatCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.NONODE);
            latch2.countDown();
        }
    };
    // symlink: /foo/$link/foo -> /foo/bar/foo, which doesn't exist
    _zkClient.getZooKeeper().exists("/foo/$link/foo", existWatch, existCallback2, null);
    latch2.await(30, TimeUnit.SECONDS);
    // update symlink. now it points to /bar/foo, which does exist.
    _zkClient.setSymlinkData("/foo/$link", "/bar", new FutureCallback<None>());
    latch.await(30, TimeUnit.SECONDS);
    // restore symlink
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", new FutureCallback<None>());
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithExistWatch3() throws InterruptedException, ExecutionException {
    final CountDownLatch latch = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.StatCallback existCallback = new AsyncCallback.StatCallback() {
        @Override/* w w  w  .  j a va  2  s.c om*/
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            latch.countDown();
        }
    };
    Watcher existWatch = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeCreated);
            _zkClient.getZooKeeper().exists(event.getPath(), null, existCallback, null);
        }
    };
    AsyncCallback.StatCallback existCallback2 = new AsyncCallback.StatCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.NONODE);
            latch2.countDown();
        }
    };
    // symlink /$link doesn't exist.
    _zkClient.getZooKeeper().exists("/$link", existWatch, existCallback2, null);
    latch2.await(30, TimeUnit.SECONDS);
    // create symlink /$link -> /foo/bar. existWatch should be notified.
    _zkClient.createSymlink("/$link", "/foo/bar", new FutureCallback<None>());
    latch.await(30, TimeUnit.SECONDS);
    // delete symlink /$link
    _zkClient.removeNodeUnsafe("/$link", new FutureCallback<None>());
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatch() throws InterruptedException {
    final CountDownLatch latch = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.ChildrenCallback childrenCallback = new AsyncCallback.ChildrenCallback() {
        @Override/*from   ww w  . jav  a2  s  .  com*/
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            Assert.assertEquals(children.size(), 11);
            latch.countDown();
        }
    };
    Watcher childrenWatch = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, childrenCallback, null);
        }
    };
    AsyncCallback.ChildrenCallback childrenCallback2 = new AsyncCallback.ChildrenCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            latch2.countDown();
        }
    };
    // symlink: /foo/$link -> /foo/bar
    _zkClient.getZooKeeper().getChildren("/foo/$link", childrenWatch, childrenCallback2, null);
    latch2.await(30, TimeUnit.SECONDS);
    _zkClient.ensurePersistentNodeExists("/foo/bar/newNode", new FutureCallback<None>());
    latch.await(30, TimeUnit.SECONDS);
    _zkClient.removeNodeUnsafe("/foo/bar/newNode", new FutureCallback<None>());
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatcher2() throws ExecutionException, InterruptedException {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.ChildrenCallback callback2 = new AsyncCallback.ChildrenCallback() {
        @Override/*w  ww .ja va2  s  .co  m*/
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            Assert.assertEquals(path, "/foo/$link");
            Assert.assertEquals(children.size(), 5);
            latch2.countDown();
        }
    };
    Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, callback2, null);
        }
    };
    AsyncCallback.ChildrenCallback callback = new AsyncCallback.ChildrenCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            latch1.countDown();
        }
    };
    // set watcher to /foo/$link
    _zkClient.getZooKeeper().getChildren("/foo/$link", watcher, callback, null);
    latch1.await(30, TimeUnit.SECONDS);
    // update symlink
    _zkClient.setSymlinkData("/foo/$link", "/bar/foo", new FutureCallback<None>());
    latch2.await(30, TimeUnit.SECONDS);
    FutureCallback<None> fcb = new FutureCallback<None>();
    // restore symlink
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", fcb);
    fcb.get();
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatcher3() throws ExecutionException, InterruptedException, KeeperException {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    Stat expectedStat1 = _zkClient.getZooKeeper().exists("/foo/bar", false);
    Stat expectedStat2 = _zkClient.getZooKeeper().exists("/bar/foo", false);

    final AsyncCallback.Children2Callback callback2 = new AsyncCallback.Children2Callback() {
        @Override//from  w w  w. j a  va 2s. c o m
        public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
            Assert.assertEquals(path, "/foo/$link");
            Assert.assertEquals(children.size(), 5);
            Assert.assertEquals(stat, expectedStat2);
            latch2.countDown();
        }
    };
    Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, callback2, null);
        }
    };
    AsyncCallback.Children2Callback callback = new AsyncCallback.Children2Callback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
            Assert.assertEquals(stat, expectedStat1);
            latch1.countDown();
        }
    };
    // set watcher to /foo/$link
    _zkClient.getZooKeeper().getChildren("/foo/$link", watcher, callback, null);
    latch1.await(30, TimeUnit.SECONDS);
    // update symlink
    _zkClient.setSymlinkData("/foo/$link", "/bar/foo", new FutureCallback<None>());
    latch2.await(30, TimeUnit.SECONDS);
    FutureCallback<None> fcb = new FutureCallback<None>();
    // restore symlink
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", fcb);
    fcb.get();
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testInvalidSymlinkWithExists() throws ExecutionException, InterruptedException {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.StatCallback callback = new AsyncCallback.StatCallback() {
        @Override/*from   w  w w .  ja va 2  s  . c  o  m*/
        public void processResult(int rc, String path, Object ctx, Stat stat) {
            Assert.assertEquals(path, "/foo/$link");
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.NONODE);
            latch1.countDown();
        }
    };
    final Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeDataChanged);
            latch2.countDown();
        }
    };
    FutureCallback<None> fcb = new FutureCallback<None>();
    _zkClient.setSymlinkData("/foo/$link", "INVALID", fcb);
    fcb.get();
    _zkClient.getZooKeeper().exists("/foo/$link", watcher, callback, null);
    latch1.await(30, TimeUnit.SECONDS);
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", fcb);
    if (!latch2.await(30, TimeUnit.SECONDS)) {
        Assert.fail("Exists Watch is not triggered");
    }
}

---

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