Examples of org.apache.zookeeper.WatchedEvent

org.apache.zookeeper.WatchedEvent
A WatchedEvent represents a change on the ZooKeeper that a Watcher is able to respond to. The WatchedEvent includes exactly what happened, the current state of the ZooKeeper, and the path of the znode that was involved in the event.


    public void setWatches(long relativeZxid, List<String> dataWatches, 
            List<String> existWatches, List<String> childWatches, Watcher watcher) {
        for(String path: dataWatches) {
            DataNode node = getNode(path);
            WatchedEvent e = null;
            if (node == null) {
                e = new WatchedEvent(EventType.NodeDeleted,
                        KeeperState.SyncConnected, path);
            } else if (node.stat.getCzxid() > relativeZxid) {
                e = new WatchedEvent(EventType.NodeCreated,
                        KeeperState.SyncConnected, path);
            } else if (node.stat.getMzxid() > relativeZxid) {
                e = new WatchedEvent(EventType.NodeDataChanged,
                        KeeperState.SyncConnected, path);
            }
            if (e != null) {
                watcher.process(e);
            } else {
                this.dataWatches.addWatch(path, watcher);
            }
        }
        for(String path: existWatches) {
            DataNode node = getNode(path);
            WatchedEvent e = null;
            if (node == null) {
                // This is the case when the watch was registered
            } else if (node.stat.getMzxid() > relativeZxid) {
                e = new WatchedEvent(EventType.NodeDataChanged,
                        KeeperState.SyncConnected, path);
            } else {
                e = new WatchedEvent(EventType.NodeCreated,
                        KeeperState.SyncConnected, path);
            }
            if (e != null) {
                watcher.process(e);
            } else {
                this.dataWatches.addWatch(path, watcher);
            }
        }
        for(String path: childWatches) {
            DataNode node = getNode(path);
            WatchedEvent e = null;
            if (node == null) {
                e = new WatchedEvent(EventType.NodeDeleted,
                        KeeperState.SyncConnected, path);
            } else if (node.stat.getPzxid() > relativeZxid) {
                e = new WatchedEvent(EventType.NodeChildrenChanged,
                        KeeperState.SyncConnected, path);
            }
            if (e != null) {
                watcher.process(e);
            } else {

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  /**
   * Simulate a zk state change by calling {@link ZkClient#process(WatchedEvent)} directly
   */
  public static void simulateZkStateDisconnected(ZkClient client) {
    WatchedEvent event = new WatchedEvent(EventType.None, KeeperState.Disconnected, null);
    client.process(event);
  }

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            conRsp.deserialize(bbia, "connect");
            negotiatedSessionTimeout = conRsp.getTimeOut();
            if (negotiatedSessionTimeout <= 0) {
                zooKeeper.state = States.CLOSED;


                eventThread.queueEvent(new WatchedEvent(
                        Watcher.Event.EventType.None,
                        Watcher.Event.KeeperState.Expired, null));
                eventThread.queueEventOfDeath();
                throw new SessionExpiredException(
                        "Unable to reconnect to ZooKeeper service, session 0x"
                        + Long.toHexString(sessionId) + " has expired");
            }
            readTimeout = negotiatedSessionTimeout * 2 / 3;
            connectTimeout = negotiatedSessionTimeout / serverAddrs.size();
            sessionId = conRsp.getSessionId();
            sessionPasswd = conRsp.getPasswd();
            zooKeeper.state = States.CONNECTED;
            LOG.info("Session establishment complete on server "
                    + ((SocketChannel)sockKey.channel())
                        .socket().getRemoteSocketAddress()
                    + ", sessionid = 0x"
                    + Long.toHexString(sessionId)
                    + ", negotiated timeout = " + negotiatedSessionTimeout);
            eventThread.queueEvent(new WatchedEvent(Watcher.Event.EventType.None,
                    Watcher.Event.KeeperState.SyncConnected, null));
        }

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            }
            if (replyHdr.getXid() == -4) {
               // -4 is the xid for AuthPacket               
                if(replyHdr.getErr() == KeeperException.Code.AUTHFAILED.intValue()) {
                    zooKeeper.state = States.AUTH_FAILED;                    
                    eventThread.queueEvent( new WatchedEvent(Watcher.Event.EventType.None, 
                            Watcher.Event.KeeperState.AuthFailed, null) );                                
                }
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Got auth sessionid:0x"
                            + Long.toHexString(sessionId));
                }
                return;
            }
            if (replyHdr.getXid() == -1) {
                // -1 means notification
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Got notification sessionid:0x"
                        + Long.toHexString(sessionId));
                }
                WatcherEvent event = new WatcherEvent();
                event.deserialize(bbia, "response");


                // convert from a server path to a client path
                if (chrootPath != null) {
                    String serverPath = event.getPath();
                    if(serverPath.compareTo(chrootPath)==0)
                        event.setPath("/");
                    else
                        event.setPath(serverPath.substring(chrootPath.length()));
                }


                WatchedEvent we = new WatchedEvent(event);
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Got " + we + " for sessionid 0x"
                            + Long.toHexString(sessionId));
                }

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                                    + RETRY_CONN_MSG,
                                    e);
                        }
                        cleanup();
                        if (zooKeeper.state.isAlive()) {
                            eventThread.queueEvent(new WatchedEvent(
                                    Event.EventType.None,
                                    Event.KeeperState.Disconnected,
                                    null));
                        }


                        now = System.currentTimeMillis();
                        lastHeard = now;
                        lastSend = now;
                    }
                }
            }
            cleanup();
            try {
                selector.close();
            } catch (IOException e) {
                LOG.warn("Ignoring exception during selector close", e);
            }
            if (zooKeeper.state.isAlive()) {
                eventThread.queueEvent(new WatchedEvent(
                        Event.EventType.None,
                        Event.KeeperState.Disconnected,
                        null));
            }
            ZooTrace.logTraceMessage(LOG, ZooTrace.getTextTraceLevel(),

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             * when the initial (or previously failed) connection cannot be re-established. This needs to be run through the retry policy
             * and callbacks need to get invoked, etc.
             */
            if ( e instanceof CuratorConnectionLossException )
            {
                WatchedEvent watchedEvent = new WatchedEvent(Watcher.Event.EventType.None, Watcher.Event.KeeperState.Disconnected, null);
                CuratorEvent event = new CuratorEventImpl(this, CuratorEventType.WATCHED, KeeperException.Code.CONNECTIONLOSS.intValue(), null, null, operationAndData.getContext(), null, null, null, watchedEvent, null);
                if ( checkBackgroundRetry(operationAndData, event) )
                {
                    queueOperation(operationAndData);
                }

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  @Test
  public void testProcessCallbackEventNone() throws Exception {
    mockNoPriorActive();
    elector.joinElection(data);


    WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
    Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.None);


    // first SyncConnected should not do anything
    Mockito.when(mockEvent.getState()).thenReturn(
        Event.KeeperState.SyncConnected);
    elector.processWatchEvent(mockZK, mockEvent);
    Mockito.verify(mockZK, Mockito.times(0)).exists(Mockito.anyString(),
        Mockito.anyBoolean(), Mockito.<AsyncCallback.StatCallback> anyObject(),
        Mockito.<Object> anyObject());


    // disconnection should enter safe mode
    Mockito.when(mockEvent.getState()).thenReturn(
        Event.KeeperState.Disconnected);
    elector.processWatchEvent(mockZK, mockEvent);
    Mockito.verify(mockApp, Mockito.times(1)).enterNeutralMode();


    // re-connection should monitor master status
    Mockito.when(mockEvent.getState()).thenReturn(
        Event.KeeperState.SyncConnected);
    elector.processWatchEvent(mockZK, mockEvent);
    verifyExistCall(1);


    // session expired should enter safe mode and initiate re-election
    // re-election checked via checking re-creation of new zookeeper and
    // call to create lock znode
    Mockito.when(mockEvent.getState()).thenReturn(Event.KeeperState.Expired);
    elector.processWatchEvent(mockZK, mockEvent);
    // already in safe mode above. should not enter safe mode again
    Mockito.verify(mockApp, Mockito.times(1)).enterNeutralMode();
    // called getNewZooKeeper to create new session. first call was in
    // constructor
    Assert.assertEquals(2, count);
    // once in initial joinElection and one now
    Mockito.verify(mockZK, Mockito.times(2)).create(ZK_LOCK_NAME, data,
        Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);


    // create znode success. become master and monitor
    elector.processResult(Code.OK.intValue(), ZK_LOCK_NAME, mockZK,
        ZK_LOCK_NAME);
    Mockito.verify(mockApp, Mockito.times(1)).becomeActive();
    verifyExistCall(2);


    // error event results in fatal error
    Mockito.when(mockEvent.getState()).thenReturn(Event.KeeperState.AuthFailed);
    elector.processWatchEvent(mockZK, mockEvent);
    Mockito.verify(mockApp, Mockito.times(1)).notifyFatalError(
        "Unexpected Zookeeper watch event state: AuthFailed");
    // only 1 state change callback is called at a time
    Mockito.verify(mockApp, Mockito.times(1)).enterNeutralMode();

View Full Code Here

    elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
        ZK_LOCK_NAME);
    Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
    verifyExistCall(1);


    WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
    Mockito.when(mockEvent.getPath()).thenReturn(ZK_LOCK_NAME);


    // monitoring should be setup again after event is received
    Mockito.when(mockEvent.getType()).thenReturn(
        Event.EventType.NodeDataChanged);
    elector.processWatchEvent(mockZK, mockEvent);
    verifyExistCall(2);


    // monitoring should be setup again after event is received
    Mockito.when(mockEvent.getType()).thenReturn(
        Event.EventType.NodeChildrenChanged);
    elector.processWatchEvent(mockZK, mockEvent);
    verifyExistCall(3);


    // lock node deletion when in standby mode should create znode again
    // successful znode creation enters active state and sets monitor
    Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.NodeDeleted);
    elector.processWatchEvent(mockZK, mockEvent);
    // enterNeutralMode not called when app is standby and leader is lost
    Mockito.verify(mockApp, Mockito.times(0)).enterNeutralMode();
    // once in initial joinElection() and one now
    Mockito.verify(mockZK, Mockito.times(2)).create(ZK_LOCK_NAME, data,
        Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
    elector.processResult(Code.OK.intValue(), ZK_LOCK_NAME, mockZK,
        ZK_LOCK_NAME);
    Mockito.verify(mockApp, Mockito.times(1)).becomeActive();
    verifyExistCall(4);


    // lock node deletion in active mode should enter neutral mode and create
    // znode again successful znode creation enters active state and sets
    // monitor
    Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.NodeDeleted);
    elector.processWatchEvent(mockZK, mockEvent);
    Mockito.verify(mockApp, Mockito.times(1)).enterNeutralMode();
    // another joinElection called
    Mockito.verify(mockZK, Mockito.times(3)).create(ZK_LOCK_NAME, data,
        Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
    elector.processResult(Code.OK.intValue(), ZK_LOCK_NAME, mockZK,
        ZK_LOCK_NAME);
    Mockito.verify(mockApp, Mockito.times(2)).becomeActive();
    verifyExistCall(5);


    // bad path name results in fatal error
    Mockito.when(mockEvent.getPath()).thenReturn(null);
    elector.processWatchEvent(mockZK, mockEvent);
    Mockito.verify(mockApp, Mockito.times(1)).notifyFatalError(
        "Unexpected watch error from Zookeeper");
    // fatal error means no new connection other than one from constructor
    Assert.assertEquals(1, count);

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    elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
        ZK_LOCK_NAME);
    Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
    verifyExistCall(1);


    WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
    Mockito.when(mockEvent.getPath()).thenReturn(ZK_LOCK_NAME);


    // notify node deletion
    // monitoring should be setup again after event is received
    Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.NodeDeleted);
    elector.processWatchEvent(mockZK, mockEvent);
    // is standby. no need to notify anything now
    Mockito.verify(mockApp, Mockito.times(0)).enterNeutralMode();
    // another joinElection called.
    Mockito.verify(mockZK, Mockito.times(2)).create(ZK_LOCK_NAME, data,

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   * joinElection(..) should happen only after SERVICE_HEALTHY.
   */
  @Test
  public void testBecomeActiveBeforeServiceHealthy() throws Exception {
    mockNoPriorActive();
    WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
    Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.None);
    // session expired should enter safe mode
    // But for first time, before the SERVICE_HEALTY i.e. appData is set,
    // should not enter the election.
    Mockito.when(mockEvent.getState()).thenReturn(Event.KeeperState.Expired);
    elector.processWatchEvent(mockZK, mockEvent);
    // joinElection should not be called.
    Mockito.verify(mockZK, Mockito.times(0)).create(ZK_LOCK_NAME, null,
        Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
  }

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