Examples with WatchedEvent org.apache.zookeeper.WatchedEvent used on opensource projects

Example 76 with WatchedEvent

use of org.apache.zookeeper.WatchedEvent in project zookeeper by apache.

the class WatchedEventTest method testCreatingWatchedEvent.

@Test
public void testCreatingWatchedEvent() {
    // EventWatch is a simple, immutable type, so all we need to do
    // is make sure we can create all possible combinations of values.
    EnumSet<EventType> allTypes = EnumSet.allOf(EventType.class);
    EnumSet<KeeperState> allStates = EnumSet.allOf(KeeperState.class);
    WatchedEvent we;
    for (EventType et : allTypes) {
        for (KeeperState ks : allStates) {
            we = new WatchedEvent(et, ks, "blah");
            assertEquals(et, we.getType());
            assertEquals(ks, we.getState());
            assertEquals("blah", we.getPath());
        }
    }
}

Example 77 with WatchedEvent

use of org.apache.zookeeper.WatchedEvent in project zookeeper by apache.

the class WatcherTest method testWatcherDisconnectOnClose.

@Test
public void testWatcherDisconnectOnClose() throws IOException, InterruptedException, KeeperException {
    ZooKeeper zk = null;
    try {
        final BlockingQueue<WatchedEvent> queue = new LinkedBlockingQueue<>();
        MyWatcher connWatcher = new MyWatcher();
        Watcher watcher = event -> {
            try {
                queue.put(event);
            } catch (InterruptedException e) {
            // Oh well, never mind
            }
        };
        zk = createClient(connWatcher, hostPort);
        StatCallback scb = new StatCallback() {

            public void processResult(int rc, String path, Object ctx, Stat stat) {
            // don't do anything
            }
        };
        // Register a watch on the node
        zk.exists("/missing", watcher, scb, null);
        // Close the client without changing the node
        zk.close();
        WatchedEvent event = queue.poll(10, TimeUnit.SECONDS);
        assertNotNull(event, "No watch event was received after closing the Zookeeper client. A 'Closed' event should have occurred");
        assertEquals(Event.EventType.None, event.getType(), "Closed events are not generated by the server, and so should have a type of 'None'");
        assertEquals(Event.KeeperState.Closed, event.getState(), "A 'Closed' event was expected as the Zookeeper client was closed without altering the node it was watching");
    } finally {
        if (zk != null) {
            zk.close();
        }
    }
}

Example 78 with WatchedEvent

use of org.apache.zookeeper.WatchedEvent in project zookeeper by apache.

the class WatcherTest method testWatcherCorrectness.

/**
 * Verify that we get all of the events we expect to get. This particular
 * case verifies that we see all of the data events on a particular node.
 * There was a bug (ZOOKEEPER-137) that resulted in events being dropped
 * in some cases (timing).
 *
 * @throws IOException
 * @throws InterruptedException
 * @throws KeeperException
 */
@Test
public void testWatcherCorrectness() throws IOException, InterruptedException, KeeperException {
    ZooKeeper zk = null;
    try {
        MyWatcher watcher = new MyWatcher();
        zk = createClient(watcher, hostPort);
        StatCallback scb = new StatCallback() {

            public void processResult(int rc, String path, Object ctx, Stat stat) {
            // don't do anything
            }
        };
        VoidCallback vcb = new VoidCallback() {

            public void processResult(int rc, String path, Object ctx) {
            // don't do anything
            }
        };
        String[] names = new String[10];
        for (int i = 0; i < names.length; i++) {
            String name = zk.create("/tc-", "initialvalue".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);
            names[i] = name;
            Stat stat = new Stat();
            zk.getData(name, watcher, stat);
            zk.setData(name, "new".getBytes(), stat.getVersion(), scb, null);
            stat = zk.exists(name, watcher);
            zk.delete(name, stat.getVersion(), vcb, null);
        }
        for (int i = 0; i < names.length; i++) {
            String name = names[i];
            WatchedEvent event = watcher.events.poll(10, TimeUnit.SECONDS);
            assertEquals(name, event.getPath());
            assertEquals(Event.EventType.NodeDataChanged, event.getType());
            assertEquals(Event.KeeperState.SyncConnected, event.getState());
            event = watcher.events.poll(10, TimeUnit.SECONDS);
            assertEquals(name, event.getPath());
            assertEquals(Event.EventType.NodeDeleted, event.getType());
            assertEquals(Event.KeeperState.SyncConnected, event.getState());
        }
    } finally {
        if (zk != null) {
            zk.close();
        }
    }
}

Example 79 with WatchedEvent

use of org.apache.zookeeper.WatchedEvent in project zookeeper by apache.

the class ZooKeeperTestClient method getEvent.

private WatchedEvent getEvent(int numTries) throws InterruptedException {
    WatchedEvent event = null;
    for (int i = 0; i < numTries; i++) {
        System.out.println("i = " + i);
        event = events.poll(10, TimeUnit.SECONDS);
        if (event != null) {
            break;
        }
        Thread.sleep(5000);
    }
    return event;
}

Example 80 with WatchedEvent

use of org.apache.zookeeper.WatchedEvent in project zookeeper by apache.

the class ZooKeeperTestClient method enode_test_2.

private void enode_test_2() throws IOException, InterruptedException, KeeperException {
    checkRoot();
    String parentName = testDirOnZK;
    String nodeName = parentName + "/enode_abc";
    ZooKeeper zk = new ZooKeeper(hostPort, 10000, this);
    ZooKeeper zk_1 = new ZooKeeper(hostPort, 10000, this);
    Stat stat_parent = zk_1.exists(parentName, false);
    if (stat_parent == null) {
        try {
            zk.create(parentName, null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        } catch (KeeperException ke) {
            fail("Creating node " + parentName + ke.getMessage());
        }
    }
    Stat stat_node = zk_1.exists(nodeName, false);
    if (stat_node != null) {
        try {
            zk.delete(nodeName, -1);
        } catch (KeeperException ke) {
            Code code = ke.code();
            boolean valid = code == KeeperException.Code.NONODE || code == KeeperException.Code.NOTEMPTY;
            if (!valid) {
                fail("Unexpected exception code for delete: " + ke.getMessage());
            }
        }
    }
    List<String> firstGen1 = zk_1.getChildren(parentName, true);
    Stat stat = new Stat();
    List<String> firstGen2 = zk_1.getChildren(parentName, true, stat);
    if (!firstGen1.equals(firstGen2)) {
        fail("children lists from getChildren()/getChildren2() do not match");
    }
    if (!stat_parent.equals(stat)) {
        fail("stat from exists()/getChildren() do not match");
    }
    try {
        zk.create(nodeName, null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    } catch (KeeperException ke) {
        Code code = ke.code();
        boolean valid = code == KeeperException.Code.NODEEXISTS;
        if (!valid) {
            fail("Unexpected exception code for createin: " + ke.getMessage());
        }
    }
    Thread.sleep(5000);
    WatchedEvent event = events.poll(10, TimeUnit.SECONDS);
    if (event == null) {
        throw new IOException("No event was delivered promptly");
    }
    if (event.getType() != EventType.NodeChildrenChanged || !event.getPath().equalsIgnoreCase(parentName)) {
        fail("Unexpected event was delivered: " + event.toString());
    }
    stat_node = zk_1.exists(nodeName, false);
    if (stat_node == null) {
        fail("node " + nodeName + " should exist");
    }
    try {
        zk.delete(parentName, -1);
        fail("Should be impossible to delete a non-empty node " + parentName);
    } catch (KeeperException ke) {
        Code code = ke.code();
        boolean valid = code == KeeperException.Code.NOTEMPTY;
        if (!valid) {
            fail("Unexpected exception code for delete: " + code);
        }
    }
    try {
        zk.create(nodeName + "/def", null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
        fail("Should be impossible to create child off Ephemeral node " + nodeName);
    } catch (KeeperException ke) {
        Code code = ke.code();
        boolean valid = code == KeeperException.Code.NOCHILDRENFOREPHEMERALS;
        if (!valid) {
            fail("Unexpected exception code for createin: " + code);
        }
    }
    try {
        List<String> children1 = zk.getChildren(nodeName, false);
        List<String> children2 = zk.getChildren(nodeName, false, null);
        if (!children1.equals(children2)) {
            fail("children lists from getChildren()/getChildren2() does not match");
        }
        if (children1.size() > 0) {
            fail("ephemeral node " + nodeName + " should not have children");
        }
    } catch (KeeperException ke) {
        Code code = ke.code();
        boolean valid = code == KeeperException.Code.NONODE;
        if (!valid) {
            fail("Unexpected exception code for createin: " + code);
        }
    }
    firstGen1 = zk_1.getChildren(parentName, true);
    firstGen2 = zk_1.getChildren(parentName, true, null);
    if (!firstGen1.equals(firstGen2)) {
        fail("children list from getChildren()/getChildren2() does not match");
    }
    stat_node = zk_1.exists(nodeName, true);
    if (stat_node == null) {
        fail("node " + nodeName + " should exist");
    }
    System.out.println("session id of zk: " + zk.getSessionId());
    System.out.println("session id of zk_1: " + zk_1.getSessionId());
    zk.close();
    zk_1.exists("nosuchnode", false);
    event = this.getEvent(10);
    if (event == null) {
        throw new Error("First event was not delivered promptly");
    }
    if (!((event.getType() == EventType.NodeChildrenChanged && event.getPath().equalsIgnoreCase(parentName)) || (event.getType() == EventType.NodeDeleted && event.getPath().equalsIgnoreCase(nodeName)))) {
        System.out.print(parentName + " " + EventType.NodeChildrenChanged + " " + nodeName + " " + EventType.NodeDeleted);
        fail("Unexpected first event was delivered: " + event.toString());
    }
    event = this.getEvent(10);
    if (event == null) {
        throw new Error("Second event was not delivered promptly");
    }
    if (!((event.getType() == EventType.NodeChildrenChanged && event.getPath().equalsIgnoreCase(parentName)) || (event.getType() == EventType.NodeDeleted && event.getPath().equalsIgnoreCase(nodeName)))) {
        System.out.print(parentName + " " + EventType.NodeChildrenChanged + " " + nodeName + " " + EventType.NodeDeleted);
        fail("Unexpected second event was delivered: " + event.toString());
    }
    firstGen1 = zk_1.getChildren(parentName, false);
    stat_node = zk_1.exists(nodeName, false);
    if (stat_node != null) {
        fail("node " + nodeName + " should have been deleted");
    }
    if (firstGen1.contains(nodeName)) {
        fail("node " + nodeName + " should not be a children");
    }
    deleteZKDir(zk_1, nodeName);
    zk_1.close();
}