Java Code Examples for com.google.common.collect.Queues#newLinkedBlockingQueue()

public EventReporter(Builder builder) {
  super(builder.context, builder.name, builder.filter, builder.rateUnit, builder.durationUnit);

  this.closer = Closer.create();
  this.immediateReportExecutor = MoreExecutors.getExitingExecutorService(
      (ThreadPoolExecutor) Executors.newFixedThreadPool(1,
          ExecutorsUtils.newThreadFactory(Optional.of(LOGGER), Optional.of("EventReporter-" + builder.name + "-%d"))),
      5, TimeUnit.MINUTES);

  this.metricContext = builder.context;
  this.notificationTargetKey = builder.context.addNotificationTarget(new Function<Notification, Void>() {
    @Nullable
    @Override
    public Void apply(Notification notification) {
      notificationCallback(notification);
      return null;
    }
  });
  this.reportingQueue = Queues.newLinkedBlockingQueue(QUEUE_CAPACITY);
}
 

@Inject
StateMachineProxy(@Nonnull @StateExecutor Executor executor, @Nonnull StateMachine stateMachine) {
  this.executor = checkNotNull(executor);
  this.stateMachine = checkNotNull(stateMachine);
  this.operations = Queues.newLinkedBlockingQueue();
  this.running = new AtomicBoolean(false);
}
 

/**
 * Test that duplicate cache flushes are filtered by
 * DistributedCacheManagerDecorator.CacheMessageSendingTransactionSynchronization.exhaustQueue(...)
 * to just the unique set, and that individual cache entry flushes  are filtered if the containing caches are also
 * being flushed in their entirety.
 */
@Test
public void testDuplicateCacheRemovalCase1() {

    // duplicate caches, we expect these to be filtered to the unique set
    Queue<CacheTarget> targets = Queues.newLinkedBlockingQueue(); 
    targets.add(CacheTarget.entireCache(ROLE_RESPONSIBILITY_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_RESPONSIBILITY_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_MEMBER_TYPE));
    targets.add(CacheTarget.entireCache(ROLE_MEMBER_TYPE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));

    // specific cache entries by key.  We expect these all to be filtered out because the entire caches
    // are being flushed based on the targets added above.
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"));
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key2"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key3"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key4"));

    // the expected result is the unique set of caches from targets
    ArrayList<CacheTarget> correctResults = Lists.newArrayList(
            CacheTarget.entireCache(ROLE_RESPONSIBILITY_CACHE),
            CacheTarget.entireCache(ROLE_MEMBER_TYPE),
            CacheTarget.entireCache(ROLE_TYPE_CACHE),
            CacheTarget.entireCache(DELEGATE_TYPE_CACHE),
            CacheTarget.entireCache(PERMISSION_TYPE));

    Collection<CacheTarget> results = new ArrayList<CacheTarget>(invokeExhaustQueue(targets));
    assertTrue(CollectionUtils.diff(correctResults, results).isEmpty());
}
 

@Override
public void executeApp() throws Exception {
    executor =
            new ThreadPoolExecutor(1, 1, 60, MILLISECONDS, Queues.newLinkedBlockingQueue());
    // need to pre-create threads, otherwise lambda execution will be captured by the
    // initial thread run, and won't really test lambda execution capture
    executor.prestartAllCoreThreads();
    transactionMarker();
}
 

@Override
public void executeApp() throws Exception {
    executor =
            new ThreadPoolExecutor(1, 1, 60, MILLISECONDS, Queues.newLinkedBlockingQueue());
    // need to pre-create threads, otherwise lambda execution will be captured by the
    // initial thread run, and won't really test lambda execution capture
    executor.prestartAllCoreThreads();
    transactionMarker();
}
 

/**
 * Test that duplicate cache flushes are filtered by
 * DistributedCacheManagerDecorator.CacheMessageSendingTransactionSynchronization.exhaustQueue(...)
 * to just the unique set, and that duplicate cache entry flushes are filtered to just the unique set as well.
 */
@Test
public void testDuplicateCacheRemovalCase2() {
    Queue<CacheTarget> targets = Queues.newLinkedBlockingQueue();

    // duplicate caches, we expect these to be filtered to the unique set
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));

    // cache entries -- we expect no filtering, since (1) the caches these entries are in are not being
    // flushed in their entirety, and (2) the cache + key combinations are unique
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"));
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key2"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key3"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key4"));

    // the expected result is the unique set of caches, and each of the specified cache entries
    ArrayList<CacheTarget> correctResults = Lists.newArrayList(
            CacheTarget.entireCache(ROLE_TYPE_CACHE),
            CacheTarget.entireCache(DELEGATE_TYPE_CACHE),
            CacheTarget.entireCache(PERMISSION_TYPE),
            CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"),
            CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key2"),
            CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key3"),
            CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key4"));

    Collection<CacheTarget> results = new ArrayList<CacheTarget>(invokeExhaustQueue(targets));
    assertTrue(CollectionUtils.diff(correctResults, results).isEmpty());
}
 

@Override
public void serviceInit(Configuration conf) throws Exception {

  this.systemConf = TUtil.checkTypeAndGet(conf, TajoConf.class);
  this.rpcParams = RpcParameterFactory.get(this.systemConf);
  this.heartBeatRequestQueue = Queues.newLinkedBlockingQueue();
  this.serviceTracker = ServiceTrackerFactory.get(systemConf);
  this.workerContext.getNodeResourceManager().getDispatcher().register(NodeStatusEvent.EventType.class, this);
  this.heartBeatInterval = systemConf.getIntVar(TajoConf.ConfVars.WORKER_HEARTBEAT_IDLE_INTERVAL);
  this.updaterThread = new StatusUpdaterThread();
  this.updaterThread.setName("NodeStatusUpdater");
  super.serviceInit(conf);
}
 

/**
 * Test that duplicate cache flushes are filtered by
 * DistributedCacheManagerDecorator.CacheMessageSendingTransactionSynchronization.exhaustQueue(...)
 * to just the unique set, and that duplicate cache entry flushes are filtered to just the unique set as well.
 */
@Test
public void testDuplicateCacheRemovalCase3() {
    Queue<CacheTarget> targets = Queues.newLinkedBlockingQueue();

    // duplicate caches, we expect these to be filtered to the unique set
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(ROLE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(DELEGATE_TYPE_CACHE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));
    targets.add(CacheTarget.entireCache(PERMISSION_TYPE));

    // duplicate cache entries, we expect these to be filtered down to the unique set.
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"));
    targets.add(CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key2"));
    targets.add(CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key2"));

    // the expected result is the unique set of caches, and the unique set of specified cache entries
    ArrayList<CacheTarget> correctResults = Lists.newArrayList(
            CacheTarget.entireCache(ROLE_TYPE_CACHE), 
            CacheTarget.entireCache(DELEGATE_TYPE_CACHE),
            CacheTarget.entireCache(PERMISSION_TYPE), 
            CacheTarget.singleEntry(ROLE_MEMBER_TYPE, "key1"),
            CacheTarget.singleEntry(ROLE_RESPONSIBILITY_CACHE, "key2"));

    Collection<CacheTarget> results = new ArrayList<CacheTarget>(invokeExhaustQueue(targets));
    assertTrue(CollectionUtils.diff(correctResults, results).isEmpty());
}
 

private AsyncAppender(Appender<ILoggingEvent> delegate) {
    this.delegate = delegate;
    this.queue = Queues.newLinkedBlockingQueue();
    this.batch = Lists.newArrayListWithCapacity(BATCH_SIZE);
    this.dispatcher = THREAD_FACTORY.newThread(this);
    setContext(delegate.getContext());
}
 

@Override
public JavaDStream<Long> getDStream() throws Exception {
  List<Long> list = Lists.newArrayList();
  for (int i = 0; i < rowsPerBatch; i++) {
    list.add(counter++);
  }
  JavaRDD<Long> longs = Contexts.getJavaStreamingContext().sparkContext().parallelize(list);
  Queue<JavaRDD<Long>> queue = Queues.newLinkedBlockingQueue();
  queue.add(longs);
  LOG.info("Created stream queue with {} rows", list.size());
  return Contexts.getJavaStreamingContext().queueStream(queue, true);
}
 

ResponseDispatcher(StreamObserver<StreamingOutputCallResponse> responseStream) {
    chunks = Queues.newLinkedBlockingQueue();
    this.responseStream = responseStream;
}
 

public MockRequester(LimiterServerResource limiterServer, long latencyMillis, int requestHandlerThreads) {
  this.limiterServer = limiterServer;
  this.latencyMillis = latencyMillis;
  this.requestHandlerThreads = requestHandlerThreads;
  this.requestAndCallbackQueue = Queues.newLinkedBlockingQueue();
}
 

@Test
public void testNonParallelCommit()
    throws Exception {

  Properties jobProps = new Properties();

  jobProps.setProperty(ConfigurationKeys.JOB_NAME_KEY, "test");
  jobProps.setProperty(ConfigurationKeys.JOB_ID_KEY, "job_id_12345");
  jobProps.setProperty(ConfigurationKeys.METRICS_ENABLED_KEY, "false");

  Map<String, JobState.DatasetState> datasetStateMap = Maps.newHashMap();
  for (int i = 0; i < 2; i++) {
    datasetStateMap.put(Integer.toString(i), new JobState.DatasetState());
  }

  final BlockingQueue<ControllableCallable<Void>> callables = Queues.newLinkedBlockingQueue();

  final JobContext jobContext =
      new ControllableCommitJobContext(jobProps, log, datasetStateMap, new Predicate<String>() {
        @Override
        public boolean apply(@Nullable String input) {
          return true;
        }
      }, callables);

  ExecutorService executorService = Executors.newSingleThreadExecutor();
  Future future = executorService.submit(new Runnable() {
    @Override
    public void run() {
      try {
        jobContext.commit();
      } catch (IOException ioe) {
        throw new RuntimeException(ioe);
      }
    }
  });

  // Not parallelized, should only one commit running
  ControllableCallable<Void> callable = callables.poll(1, TimeUnit.SECONDS);
  Assert.assertNotNull(callable);
  Assert.assertNull(callables.poll(200, TimeUnit.MILLISECONDS));

  // unblock first commit, should see a second commit
  callable.unblock();
  callable = callables.poll(1, TimeUnit.SECONDS);
  Assert.assertNotNull(callable);
  Assert.assertNull(callables.poll(200, TimeUnit.MILLISECONDS));
  Assert.assertFalse(future.isDone());

  // unblock second commit, commit should complete
  callable.unblock();
  future.get(1, TimeUnit.SECONDS);
  Assert.assertEquals(jobContext.getJobState().getState(), JobState.RunningState.COMMITTED);
}
 

@Test
public void testSingleExceptionSemantics()
    throws Exception {

  Properties jobProps = new Properties();

  jobProps.setProperty(ConfigurationKeys.JOB_NAME_KEY, "test");
  jobProps.setProperty(ConfigurationKeys.JOB_ID_KEY, "job_id_12345");
  jobProps.setProperty(ConfigurationKeys.METRICS_ENABLED_KEY, "false");

  Map<String, JobState.DatasetState> datasetStateMap = Maps.newHashMap();
  for (int i = 0; i < 3; i++) {
    datasetStateMap.put(Integer.toString(i), new JobState.DatasetState());
  }

  final BlockingQueue<ControllableCallable<Void>> callables = Queues.newLinkedBlockingQueue();

  // There are three datasets, "0", "1", and "2", middle one will fail
  final JobContext jobContext =
      new ControllableCommitJobContext(jobProps, log, datasetStateMap, new Predicate<String>() {
        @Override
        public boolean apply(@Nullable String input) {
          return !input.equals("1");
        }
      }, callables);

  ExecutorService executorService = Executors.newSingleThreadExecutor();
  Future future = executorService.submit(new Runnable() {
    @Override
    public void run() {
      try {
        jobContext.commit();
      } catch (IOException ioe) {
        throw new RuntimeException(ioe);
      }
    }
  });

  // All three commits should be run (even though second one fails)
  callables.poll(1, TimeUnit.SECONDS).unblock();
  callables.poll(1, TimeUnit.SECONDS).unblock();
  callables.poll(1, TimeUnit.SECONDS).unblock();

  try {
    // check future is done
    future.get(1, TimeUnit.SECONDS);
    Assert.fail();
  } catch (ExecutionException ee) {
    // future should fail
  }
  // job failed
  Assert.assertEquals(jobContext.getJobState().getState(), JobState.RunningState.FAILED);
}
 

@Test
public void testBrokerChange() throws Exception {
  // Create a new namespace in ZK for Kafka server for this test case
  String connectionStr = zkServer.getConnectionStr() + "/broker_change";
  ZKClientService zkClient = ZKClientService.Builder.of(connectionStr).build();
  zkClient.startAndWait();
  zkClient.create("/", null, CreateMode.PERSISTENT).get();

  // Start a new kafka server
  File logDir = TMP_FOLDER.newFolder();
  EmbeddedKafkaServer server = new EmbeddedKafkaServer(generateKafkaConfig(connectionStr, logDir));
  server.startAndWait();

  // Start a Kafka client
  KafkaClientService kafkaClient = new ZKKafkaClientService(zkClient);
  kafkaClient.startAndWait();

  // Attach a consumer
  final BlockingQueue<String> consumedMessages = Queues.newLinkedBlockingQueue();
  kafkaClient.getConsumer()
    .prepare().addFromBeginning("test", 0).consume(new KafkaConsumer.MessageCallback() {
    @Override
    public long onReceived(Iterator<FetchedMessage> messages) {
      long nextOffset = -1L;
      while (messages.hasNext()) {
        FetchedMessage message = messages.next();
        nextOffset = message.getNextOffset();
        consumedMessages.add(Charsets.UTF_8.decode(message.getPayload()).toString());
      }
      return nextOffset;
    }

    @Override
    public void finished() {
      // No-op
    }
  });

  // Get a publisher and publish a message
  KafkaPublisher publisher = kafkaClient.getPublisher(KafkaPublisher.Ack.FIRE_AND_FORGET, Compression.NONE);
  publisher.prepare("test").add(Charsets.UTF_8.encode("Message 0"), 0).send().get();

  // Should receive one message
  Assert.assertEquals("Message 0", consumedMessages.poll(5, TimeUnit.SECONDS));

  // Now shutdown and restart the server on different port
  server.stopAndWait();
  server = new EmbeddedKafkaServer(generateKafkaConfig(connectionStr, logDir));
  server.startAndWait();

  // Wait a little while to make sure changes is reflected in broker service
  TimeUnit.SECONDS.sleep(3);

  // Now publish again with the same publisher. It should succeed and the consumer should receive the message.
  publisher.prepare("test").add(Charsets.UTF_8.encode("Message 1"), 0).send().get();
  Assert.assertEquals("Message 1", consumedMessages.poll(5, TimeUnit.SECONDS));

  kafkaClient.stopAndWait();
  zkClient.stopAndWait();
  server.stopAndWait();
}
 

@Test
public void testEventOrdering() throws Exception
{
    ExecutorService executorService = Executors.newFixedThreadPool(THREAD_QTY);
    BlockingQueue<Event> events = Queues.newLinkedBlockingQueue();
    final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
    T cache = null;
    try
    {
        client.start();
        client.create().forPath("/root");
        cache = newCache(client, "/root", events);

        final Random random = new Random();
        final Callable<Void> task = new Callable<Void>()
        {
            @Override
            public Void call() throws Exception
            {
                for ( int i = 0; i < ITERATIONS; ++i )
                {
                    String node = "/root/" + random.nextInt(NODE_QTY);
                    try
                    {
                        switch ( random.nextInt(3) )
                        {
                        default:
                        case 0:
                            client.create().forPath(node);
                            break;

                        case 1:
                            client.setData().forPath(node, "new".getBytes());
                            break;

                        case 2:
                            client.delete().forPath(node);
                            break;
                        }
                    }
                    catch ( KeeperException ignore )
                    {
                        // ignore
                    }
                }
                return null;
            }
        };

        final CountDownLatch latch = new CountDownLatch(THREAD_QTY);
        for ( int i = 0; i < THREAD_QTY; ++i )
        {
            Callable<Void> wrapped = new Callable<Void>()
            {
                @Override
                public Void call() throws Exception
                {
                    try
                    {
                        return task.call();
                    }
                    finally
                    {
                        latch.countDown();
                    }
                }
            };
            executorService.submit(wrapped);
        }
        Assert.assertTrue(timing.awaitLatch(latch));

        timing.sleepABit();

        List<Event> localEvents = Lists.newArrayList();
        int eventSuggestedQty = 0;
        while ( events.size() > 0 )
        {
            Event event = events.take();
            localEvents.add(event);
            eventSuggestedQty += (event.eventType == EventType.ADDED) ? 1 : -1;
        }
        int actualQty = getActualQty(cache);
        Assert.assertEquals(actualQty, eventSuggestedQty, String.format("actual %s expected %s:\n %s", actualQty, eventSuggestedQty, asString(localEvents)));
    }
    finally
    {
        executorService.shutdownNow();
        //noinspection ThrowFromFinallyBlock
        executorService.awaitTermination(timing.milliseconds(), TimeUnit.MILLISECONDS);
        CloseableUtils.closeQuietly(cache);
        CloseableUtils.closeQuietly(client);
    }
}
 

@Test
public void testBasic() throws Exception
{
    WorkflowListenerManager workflowListenerManager = null;
    TestTaskExecutor taskExecutor = new TestTaskExecutor(6);
    TaskType taskType = new TaskType("test", "1", true);
    WorkflowManager workflowManager = WorkflowManagerBuilder.builder()
        .addingTaskExecutor(taskExecutor, 10, taskType)
        .withCurator(curator, "test", "1")
        .build();
    try
    {
        Task task = new Task(new TaskId(), taskType);

        BlockingQueue<WorkflowEvent> eventQueue = Queues.newLinkedBlockingQueue();
        workflowListenerManager = workflowManager.newWorkflowListenerManager();
        workflowListenerManager.getListenable().addListener(eventQueue::add);

        workflowManager.start();
        workflowListenerManager.start();

        RunId runId = workflowManager.submitTask(task);

        timing.sleepABit();

        WorkflowEvent runStarted = new WorkflowEvent(WorkflowEvent.EventType.RUN_STARTED, runId);
        WorkflowEvent taskStarted = new WorkflowEvent(WorkflowEvent.EventType.TASK_STARTED, runId, task.getTaskId());
        WorkflowEvent event1 = eventQueue.poll(timing.milliseconds(), TimeUnit.MILLISECONDS);
        WorkflowEvent event2 = eventQueue.poll(timing.milliseconds(), TimeUnit.MILLISECONDS);
        // due to timing, task start might come first
        Assert.assertTrue((event1.equals(runStarted) && event2.equals(taskStarted)) || (event2.equals(runStarted) && event1.equals(taskStarted)));

        Assert.assertEquals(eventQueue.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), new WorkflowEvent(WorkflowEvent.EventType.TASK_COMPLETED, runId, task.getTaskId()));
        Assert.assertEquals(eventQueue.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), new WorkflowEvent(WorkflowEvent.EventType.RUN_UPDATED, runId));
    }
    finally
    {
        CloseableUtils.closeQuietly(workflowListenerManager);
        CloseableUtils.closeQuietly(workflowManager);
    }
}
 

@Test(enabled = false)  // this test is very flakey - it needs to be re-written at some point
public void testMissedDelete() throws Exception
{
    Timing timing = new Timing();
    PathChildrenCache cache = null;
    CuratorFramework client1 = null;
    CuratorFramework client2 = null;
    TestingCluster cluster = createAndStartCluster(3);
    try
    {
        // client 1 only connects to 1 server
        InstanceSpec client1Instance = cluster.getInstances().iterator().next();
        client1 = CuratorFrameworkFactory.newClient(client1Instance.getConnectString(), 1000, 1000, new RetryOneTime(1));
        cache = new PathChildrenCache(client1, "/test", true);
        final BlockingQueue<PathChildrenCacheEvent.Type> events = Queues.newLinkedBlockingQueue();
        PathChildrenCacheListener listener = new PathChildrenCacheListener()
        {
            @Override
            public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception
            {
                events.add(event.getType());
            }
        };
        cache.getListenable().addListener(listener);

        client2 = CuratorFrameworkFactory.newClient(cluster.getConnectString(), 1000, 1000, new RetryOneTime(1));

        client1.start();
        client2.start();
        cache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CONNECTION_RECONNECTED);
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.INITIALIZED);

        client2.create().creatingParentsIfNeeded().forPath("/test/node", "first".getBytes());
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CHILD_ADDED);

        cluster.killServer(client1Instance);
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CONNECTION_SUSPENDED);
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CONNECTION_LOST);

        client2.delete().forPath("/test/node");
        client2.create().forPath("/test/node", "second".getBytes());
        cluster.restartServer(client1Instance);

        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CONNECTION_RECONNECTED);
        Assert.assertEquals(events.poll(timing.milliseconds(), TimeUnit.MILLISECONDS), PathChildrenCacheEvent.Type.CHILD_UPDATED);  // "/test/node" is different - should register as updated
    }
    finally
    {
        CloseableUtils.closeQuietly(client1);
        CloseableUtils.closeQuietly(client2);
        CloseableUtils.closeQuietly(cache);
        CloseableUtils.closeQuietly(cluster);
    }
}
 

/**
 * The {@link StreamObserver} will be used to send the queue of response chunks. Since calls to
 * {@link StreamObserver} must be synchronized across threads, no further calls should be made
 * directly on {@code responseStream} after it is provided to the {@link ResponseDispatcher}.
 */
public ResponseDispatcher(StreamObserver<StreamingOutputCallResponse> responseStream) {
  this.chunks = Queues.newLinkedBlockingQueue();
  this.responseStream = responseStream;
}
 

/**
 * The {@link StreamObserver} will be used to send the queue of response chunks. Since calls to
 * {@link StreamObserver} must be synchronized across threads, no further calls should be made
 * directly on {@code responseStream} after it is provided to the {@link ResponseDispatcher}.
 */
public ResponseDispatcher(StreamObserver<StreamingOutputCallResponse> responseStream) {
  this.chunks = Queues.newLinkedBlockingQueue();
  this.responseStream = responseStream;
}