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.talis.platform.sequencing.zookeeper.ZooKeeperProvider.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    switch (event.getType()) {
    case None://from w  w  w.  j  av  a  2 s .c  om
        processNoneTypeEvent(event.getState());
    default:
        // do nothing
    }
}

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From source file:com.taobao.adfs.zookeeper.ZookeeperClientManager.java

License:Apache License

public synchronized ZooKeeper create(String connectString, int sessionTimeout) throws IOException {
    ZooKeeper zookeeper = zookeeperRepository.get(connectString);
    if (zookeeper != null) {
        Utilities.logDebug(logger, "reuse zookeeper client, address=", connectString);
        return zookeeper;
    }//www .ja v a  2s.  c  o m
    this.timeout = sessionTimeout;

    Watcher watcher = new Watcher() {
        public void process(WatchedEvent event) {
            switch (event.getType()) {
            case None: {
                connectionEvent(event);
                break;
            }
            }
        }
    };
    zookeeper = new ZooKeeper(connectString, sessionTimeout, watcher);
    try {
        connectedSignal.await();
    } catch (InterruptedException e) {
        Utilities.logDebug(logger, "notify by SynConnected.");
    }
    zookeeperRepository.put(connectString, zookeeper);
    Utilities.logDebug(logger, "create zookeeper client, address=", connectString);
    return zookeeper;
}

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From source file:com.twitter.common.zookeeper.SingletonServiceTest.java

License:Apache License

@Test
public void testNonLeaderDisconnect() throws Exception {
    CountDownLatch elected = new CountDownLatch(1);
    listener.onLeading(EasyMock.<LeaderControl>anyObject());
    expectLastCall().andAnswer(countDownAnswer(elected));
    listener.onDefeated(null);//  w  w w .ja v  a2 s. co m
    expectLastCall().anyTimes();

    control.replay();

    ZooKeeperClient zkClient = createZkClient();
    String path = "/fake/path";
    // Create a fake leading candidate node to ensure that the leader in this test is never
    // elected.
    ZooKeeperUtils.ensurePath(zkClient, ZooKeeperUtils.OPEN_ACL_UNSAFE, path);
    String leaderNode = zkClient.get().create(path + "/" + SingletonService.LEADER_ELECT_NODE_PREFIX,
            "fake_leader".getBytes(), ZooKeeperUtils.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);

    serverSet = new ServerSetImpl(zkClient, path);
    candidate = SingletonService.createSingletonCandidate(zkClient, path, ZooKeeperUtils.OPEN_ACL_UNSAFE);
    DefeatOnDisconnectLeader leader = new DefeatOnDisconnectLeader(zkClient, listener);
    service = new SingletonService(serverSet, candidate);
    service.lead(InetSocketAddress.createUnresolved("foo", PORT_A),
            ImmutableMap.of("http-admin", InetSocketAddress.createUnresolved("foo", PORT_B)), leader);

    final CountDownLatch disconnected = new CountDownLatch(1);
    zkClient.register(new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if ((event.getType() == EventType.None) && (event.getState() == KeeperState.Disconnected)) {
                disconnected.countDown();
            }
        }
    });

    shutdownNetwork();
    disconnected.await();

    restartNetwork();
    zkClient.get().delete(leaderNode, ZooKeeperUtils.ANY_VERSION);
    // Upon deletion of the fake leader node, the candidate should become leader.
    elected.await();
}

---

From source file:com.twitter.common.zookeeper.ZooKeeperClient.java

License:Apache License

/**
 * Returns the current active ZK connection or establishes a new one if none has yet been
 * established or a previous connection was disconnected or had its session time out.  This
 * method will attempt to re-use sessions when possible.
 *
 * @param connectionTimeout the maximum amount of time to wait for the connection to the ZK
 *     cluster to be established; 0 to wait forever
 * @return a connected ZooKeeper client/*  ww  w  .ja  v  a 2 s  .  co  m*/
 * @throws ZooKeeperConnectionException if there was a problem connecting to the ZK cluster
 * @throws InterruptedException if interrupted while waiting for a connection to be established
 * @throws TimeoutException if a connection could not be established within the configured
 *     session timeout
 */
public synchronized ZooKeeper get(Amount<Long, Time> connectionTimeout)
        throws ZooKeeperConnectionException, InterruptedException, TimeoutException {

    if (zooKeeper == null) {
        final CountDownLatch connected = new CountDownLatch(1);
        Watcher watcher = new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                switch (event.getType()) {
                // Guard the None type since this watch may be used as the default watch on calls by
                // the client outside our control.
                case None:
                    switch (event.getState()) {
                    case Expired:
                        LOG.info("Zookeeper session expired. Event: " + event);
                        close();
                        break;
                    case SyncConnected:
                        connected.countDown();
                        break;
                    }
                }

                eventQueue.offer(event);
            }
        };

        try {
            zooKeeper = (sessionState != null)
                    ? new ZooKeeper(zooKeeperServers, sessionTimeoutMs, watcher, sessionState.sessionId,
                            sessionState.sessionPasswd)
                    : new ZooKeeper(zooKeeperServers, sessionTimeoutMs, watcher);
        } catch (IOException e) {
            throw new ZooKeeperConnectionException("Problem connecting to servers: " + zooKeeperServers, e);
        }

        if (connectionTimeout.getValue() > 0) {
            if (!connected.await(connectionTimeout.as(Time.MILLISECONDS), TimeUnit.MILLISECONDS)) {
                close();
                throw new TimeoutException("Timed out waiting for a ZK connection after " + connectionTimeout);
            }
        } else {
            try {
                connected.await();
            } catch (InterruptedException ex) {
                LOG.info("Interrupted while waiting to connect to zooKeeper");
                close();
                throw ex;
            }
        }
        credentials.authenticate(zooKeeper);

        sessionState = new SessionState(zooKeeper.getSessionId(), zooKeeper.getSessionPasswd());
    }
    return zooKeeper;
}

---

From source file:com.twitter.common.zookeeper.ZooKeeperClient.java

License:Apache License

/**
 * Clients that need to re-establish state after session expiration can register an
 * {@code onExpired} command to execute.
 *
 * @param onExpired the {@code Command} to register
 * @return the new {@link Watcher} which can later be passed to {@link #unregister} for
 *     removal.//from   w ww.  j  av  a2  s  . c o m
 */
public Watcher registerExpirationHandler(final Command onExpired) {
    Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (event.getType() == EventType.None && event.getState() == KeeperState.Expired) {
                onExpired.execute();
            }
        }
    };
    register(watcher);
    return watcher;
}

---

From source file:com.twitter.common.zookeeper.ZooKeeperMap.java

License:Apache License

private synchronized void watchChildren()
        throws InterruptedException, KeeperException, ZooKeeperConnectionException {

    /*//from www. j a va  2s.  co  m
     * Add a watch on the parent node itself, and attempt to rewatch if it
     * gets deleted
     */
    zkClient.get().exists(nodePath, new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (event.getType() == Watcher.Event.EventType.NodeDeleted) {
                // If the parent node no longer exists
                localMap.clear();
                try {
                    tryWatchChildren();
                } catch (InterruptedException e) {
                    LOG.log(Level.WARNING, "Interrupted while trying to watch children.", e);
                    Thread.currentThread().interrupt();
                }
            }
        }
    });

    final Watcher childWatcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (event.getType() == Watcher.Event.EventType.NodeChildrenChanged) {
                try {
                    tryWatchChildren();
                } catch (InterruptedException e) {
                    LOG.log(Level.WARNING, "Interrupted while trying to watch children.", e);
                    Thread.currentThread().interrupt();
                }
            }
        }
    };

    List<String> children = zkClient.get().getChildren(nodePath, childWatcher);
    updateChildren(Sets.newHashSet(children));
}

---

From source file:com.twitter.common.zookeeper.ZooKeeperMap.java

License:Apache License

private void addChild(final String child)
        throws InterruptedException, KeeperException, ZooKeeperConnectionException {

    final Watcher nodeWatcher = new Watcher() {
        @Override// w ww  . jav a2 s.  c om
        public void process(WatchedEvent event) {
            if (event.getType() == Watcher.Event.EventType.NodeDataChanged) {
                try {
                    tryAddChild(child);
                } catch (InterruptedException e) {
                    LOG.log(Level.WARNING, "Interrupted while trying to add a child.", e);
                    Thread.currentThread().interrupt();
                }
            } else if (event.getType() == Watcher.Event.EventType.NodeDeleted) {
                removeEntry(child);
            }
        }
    };

    try {
        V value = deserializer.apply(zkClient.get().getData(makePath(child), nodeWatcher, null));
        putEntry(child, value);
    } catch (KeeperException.NoNodeException e) {
        // This node doesn't exist anymore, remove it from the map and we're done.
        removeEntry(child);
    }
}

---

From source file:com.twitter.distributedlog.acl.ZKAccessControlManager.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (Event.EventType.None.equals(event.getType())) {
        if (event.getState() == Event.KeeperState.Expired) {
            refetchAllAccessControlEntries(0);
        }//  ww w  . ja va2  s.c  om
    } else if (Event.EventType.NodeDataChanged.equals(event.getType())) {
        logger.info("Default ACL for {} is changed, refetching ...", zkRootPath);
        refetchDefaultAccessControlEntry(0);
    } else if (Event.EventType.NodeChildrenChanged.equals(event.getType())) {
        logger.info("List of ACLs for {} are changed, refetching ...", zkRootPath);
        refetchAccessControlEntries(0);
    }
}

---

From source file:com.twitter.distributedlog.BKLogHandler.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (Watcher.Event.EventType.None.equals(event.getType())) {
        if (event.getState() == Watcher.Event.KeeperState.Expired) {
            // if the watcher is expired
            scheduler.schedule(new WatcherGetLedgersCallback(getFullyQualifiedName()),
                    conf.getZKRetryBackoffStartMillis(), TimeUnit.MILLISECONDS);
        }/*from   ww w  . j a  v  a  2 s  . c  om*/
    } else if (Watcher.Event.EventType.NodeChildrenChanged.equals(event.getType())) {
        if (LOG.isTraceEnabled()) {
            LOG.trace("LogSegments Changed under {}.", getFullyQualifiedName());
        }
        asyncGetLedgerListWithRetries(LogSegmentMetadata.COMPARATOR, filter, getChildrenWatcher,
                new WatcherGetLedgersCallback(getFullyQualifiedName()));
    }
}

---

From source file:com.twitter.distributedlog.impl.federated.FederatedZKLogMetadataStore.java

License:Apache License

@Override
public void process(WatchedEvent watchedEvent) {
    if (Event.EventType.None == watchedEvent.getType()
            && Event.KeeperState.Expired == watchedEvent.getState()) {
        scheduleTask(this, conf.getZKSessionTimeoutMilliseconds());
        return;//from w  ww . j  a va 2s.c  o m
    }
    if (Event.EventType.NodeChildrenChanged == watchedEvent.getType()) {
        // fetch the namespace
        fetchSubNamespaces(this).addEventListener(this);
    }
}

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