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.

    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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                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");
            }

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                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");
            }

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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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        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

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          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);
      }

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        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);
      }

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        adapter.setCassandraClient(cassandraClient);
        adapter.setMasterElector(elector);
        broker.setPersistenceAdapter(adapter);
        broker.start();
        elector.waitTillMaster();
        elector.process(new WatchedEvent(Watcher.Event.EventType.None, Watcher.Event.KeeperState.Disconnected, null));
        Thread.sleep(5000);
        Assert.assertFalse(broker.isStarted());
        elector.stop();
    }

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