Examples with DbusEventBufferReader com.linkedin.databus.core.test.DbusEventBufferReader used on opensource projects

Example 1 with DbusEventBufferReader

use of com.linkedin.databus.core.test.DbusEventBufferReader in project databus by linkedin.

the class TestGenericDispatcher method testPartialWindowRollback.

@Test(groups = { "small", "functional" })
public /**
 * Tests the case where the dispatcher exits the main processing loop in {@link GenericDispatcher#doDispatchEvents()}
 * with a partial window and the flushing of the outstanding callbacks fails. We want to make sure that a rollback
 * is correctly triggered.
 *
 * The test simulates the following case: e1_1 e1_2 e1_3 <EOW> e2_1 e2_2 e2_3 <EOW> ... with a failure in the e2_2
 * callback.
 *
 * 1) Read full first window: e1_1 e1_2 e1_3 <EOW>
 * 2) Read partial second window: e2_1 e2_2
 * 3) The above should fail -- verify that rollback is called
 * 4) Read the rest
 */
void testPartialWindowRollback() throws Exception {
    final Logger log = Logger.getLogger("TestGenericDispatcher.testPartialWindowRollback");
    // log.setLevel(Level.INFO);
    log.info("start");
    final Level saveLevel = Logger.getLogger("com.linkedin.databus.client").getLevel();
    // Logger.getLogger("com.linkedin.databus.client").setLevel(Level.DEBUG);
    // generate events
    Vector<Short> srcIdList = new Vector<Short>();
    srcIdList.add((short) 1);
    DbusEventGenerator evGen = new DbusEventGenerator(0, srcIdList);
    Vector<DbusEvent> srcTestEvents = new Vector<DbusEvent>();
    final int numEvents = 9;
    // 1-based number of the event callback to fail
    final int numOfFailureEvent = 5;
    final int numEventsPerWindow = 3;
    final int payloadSize = 200;
    final int numWindows = (int) Math.ceil(1.0 * numEvents / numEventsPerWindow);
    Assert.assertTrue(evGen.generateEvents(numEvents, numEventsPerWindow, 500, payloadSize, srcTestEvents) > 0);
    // find out how much data we need to stream for the failure
    // account for the EOW event which is < payload size
    int win1Size = payloadSize - 1;
    int win2Size = 0;
    int eventN = 0;
    for (DbusEvent e : srcTestEvents) {
        eventN++;
        if (eventN <= numEventsPerWindow) {
            win1Size += e.size();
        } else if (eventN <= numOfFailureEvent) {
            win2Size += e.size();
        }
    }
    // serialize the events to a buffer so they can be sent to the client
    final TestGenericDispatcherEventBuffer srcEventsBuf = new TestGenericDispatcherEventBuffer(_generic100KBufferStaticConfig);
    DbusEventAppender eventProducer = new DbusEventAppender(srcTestEvents, srcEventsBuf, null, true);
    Thread tEmitter = new Thread(eventProducer);
    tEmitter.start();
    // Create destination (client) buffer
    final TestGenericDispatcherEventBuffer destEventsBuf = new TestGenericDispatcherEventBuffer(_generic100KBufferStaticConfig);
    // Create dispatcher
    final TimeoutTestConsumer mockConsumer = new TimeoutTestConsumer(100, 10, 0, numOfFailureEvent, 0, 1);
    SelectingDatabusCombinedConsumer sdccMockConsumer = new SelectingDatabusCombinedConsumer((DatabusStreamConsumer) mockConsumer);
    List<String> sources = new ArrayList<String>();
    Map<Long, IdNamePair> sourcesMap = new HashMap<Long, IdNamePair>();
    for (int i = 1; i <= 3; ++i) {
        IdNamePair sourcePair = new IdNamePair((long) i, "source" + i);
        sources.add(sourcePair.getName());
        sourcesMap.put(sourcePair.getId(), sourcePair);
    }
    DatabusV2ConsumerRegistration consumerReg = new DatabusV2ConsumerRegistration(sdccMockConsumer, sources, null);
    List<DatabusV2ConsumerRegistration> allRegistrations = Arrays.asList(consumerReg);
    final ConsumerCallbackStats callbackStats = new ConsumerCallbackStats(0, "test", "test", true, false, null);
    final UnifiedClientStats unifiedStats = new UnifiedClientStats(0, "test", "test.unified");
    MultiConsumerCallback callback = new MultiConsumerCallback(allRegistrations, Executors.newFixedThreadPool(2), 1000, new StreamConsumerCallbackFactory(callbackStats, unifiedStats), callbackStats, unifiedStats, null, null);
    callback.setSourceMap(sourcesMap);
    List<DatabusSubscription> subs = DatabusSubscription.createSubscriptionList(sources);
    final RelayDispatcher dispatcher = new RelayDispatcher("dispatcher", _genericRelayConnStaticConfig, subs, new InMemoryPersistenceProvider(), destEventsBuf, callback, null, null, null, null, null);
    dispatcher.setSchemaIdCheck(false);
    Thread dispatcherThread = new Thread(dispatcher);
    dispatcherThread.setDaemon(true);
    log.info("starting dispatcher thread");
    dispatcherThread.start();
    HashMap<Long, List<RegisterResponseEntry>> schemaMap = new HashMap<Long, List<RegisterResponseEntry>>();
    List<RegisterResponseEntry> l1 = new ArrayList<RegisterResponseEntry>();
    List<RegisterResponseEntry> l2 = new ArrayList<RegisterResponseEntry>();
    List<RegisterResponseEntry> l3 = new ArrayList<RegisterResponseEntry>();
    l1.add(new RegisterResponseEntry(1L, (short) 1, SOURCE1_SCHEMA_STR));
    l2.add(new RegisterResponseEntry(2L, (short) 1, SOURCE2_SCHEMA_STR));
    l3.add(new RegisterResponseEntry(3L, (short) 1, SOURCE3_SCHEMA_STR));
    schemaMap.put(1L, l1);
    schemaMap.put(2L, l2);
    schemaMap.put(3L, l3);
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesIdsMessage(sourcesMap.values()));
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesSchemasMessage(schemaMap));
    log.info("starting event dispatch");
    // stream the events from the source buffer without the EOW
    // comm channels between reader and writer
    Pipe pipe = Pipe.open();
    Pipe.SinkChannel writerStream = pipe.sink();
    Pipe.SourceChannel readerStream = pipe.source();
    writerStream.configureBlocking(true);
    readerStream.configureBlocking(false);
    // Event writer - Relay in the real world
    Checkpoint cp = Checkpoint.createFlexibleCheckpoint();
    // Event readers - Clients in the real world
    // Checkpoint pullerCheckpoint = Checkpoint.createFlexibleCheckpoint();
    DbusEventsStatisticsCollector clientStats = new DbusEventsStatisticsCollector(0, "client", true, false, null);
    DbusEventBufferReader reader = new DbusEventBufferReader(destEventsBuf, readerStream, null, clientStats);
    UncaughtExceptionTrackingThread tReader = new UncaughtExceptionTrackingThread(reader, "Reader");
    tReader.setDaemon(true);
    tReader.start();
    try {
        log.info("send first window -- that one should be OK");
        StreamEventsResult streamRes = srcEventsBuf.streamEvents(cp, writerStream, new StreamEventsArgs(win1Size));
        Assert.assertEquals(numEventsPerWindow + 1, streamRes.getNumEventsStreamed());
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                return 1 == callbackStats.getNumSysEventsProcessed();
            }
        }, "first window processed", 5000, log);
        log.info("send the second partial window -- that one should cause an error");
        streamRes = srcEventsBuf.streamEvents(cp, writerStream, new StreamEventsArgs(win2Size));
        Assert.assertEquals(numOfFailureEvent - numEventsPerWindow, streamRes.getNumEventsStreamed());
        log.info("wait for dispatcher to finish");
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                log.info("events received: " + callbackStats.getNumDataEventsReceived());
                return numOfFailureEvent <= callbackStats.getNumDataEventsProcessed();
            }
        }, "all events until the error processed", 5000, log);
        log.info("all data events have been received but no EOW");
        Assert.assertEquals(numOfFailureEvent, clientStats.getTotalStats().getNumDataEvents());
        Assert.assertEquals(1, clientStats.getTotalStats().getNumSysEvents());
        // at least one failing event therefore < numOfFailureEvent events can be processed
        Assert.assertTrue(numOfFailureEvent <= callbackStats.getNumDataEventsProcessed());
        // onDataEvent callbacks for e2_1 and e2_2 get cancelled
        Assert.assertEquals(2, callbackStats.getNumDataErrorsProcessed());
        // only one EOW
        Assert.assertEquals(1, callbackStats.getNumSysEventsProcessed());
        log.info("Send the remainder of the window");
        streamRes = srcEventsBuf.streamEvents(cp, writerStream, new StreamEventsArgs(100000));
        // remaining events + EOWs
        Assert.assertEquals(srcTestEvents.size() + numWindows - (numOfFailureEvent + 1), streamRes.getNumEventsStreamed());
        log.info("wait for the rollback");
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                return 1 == mockConsumer.getNumRollbacks();
            }
        }, "rollback seen", 5000, log);
        log.info("wait for dispatcher to finish after the rollback");
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                log.info("num windows processed: " + callbackStats.getNumSysEventsProcessed());
                return numWindows == callbackStats.getNumSysEventsProcessed();
            }
        }, "all events processed", 5000, log);
    } finally {
        reader.stop();
        dispatcher.shutdown();
        log.info("all events processed");
        verifyNoLocks(null, srcEventsBuf);
        verifyNoLocks(null, destEventsBuf);
    }
    Logger.getLogger("com.linkedin.databus.client").setLevel(saveLevel);
    log.info("end\n");
}

Example 2 with DbusEventBufferReader

use of com.linkedin.databus.core.test.DbusEventBufferReader in project databus by linkedin.

the class ReadEventsTestParams method runConstEventsReaderWriter.

// data flow:  emitter/producer/appender -> DEB -> writer -> pipe -> reader -> DEB -> consumer
protected boolean runConstEventsReaderWriter(Vector<DbusEvent> srcTestEvents, Vector<DbusEvent> dstTestEvents, EventBufferTestInput input, DbusEventsStatisticsCollector emitterStats, DbusEventsStatisticsCollector streamStats, DbusEventsStatisticsCollector clientStats, boolean autoStartBuffer) throws Exception {
    LOG.info("starting runConstEventsReaderWriter for " + input.getTestName());
    int numEvents = input.getNumEvents();
    int maxWindowSize = input.getWindowSize();
    DbusEventGenerator evGen = new DbusEventGenerator();
    if (evGen.generateEvents(numEvents, maxWindowSize, 512, input.getPayloadSize(), srcTestEvents) <= 0) {
        return false;
    }
    int eventSize = srcTestEvents.get(0).size();
    long producerBufferSize = input.getProducerBufferSize() * eventSize;
    long sharedBufferSize = input.getSharedBufferSize() * eventSize;
    int stagingBufferSize = input.getStagingBufferSize() * eventSize;
    int individualBufferSize = input.getIndividualBufferSize() * eventSize;
    int indexSize = input.getIndexSize() * eventSize;
    QueuePolicy prodQueuePolicy = input.getProdQueuePolicy();
    QueuePolicy consQueuePolicy = input.getConsQueuePolicy();
    // create the main event buffers
    DbusEventBuffer prodEventBuffer = new DbusEventBuffer(getConfig(producerBufferSize, individualBufferSize, indexSize, stagingBufferSize, AllocationPolicy.HEAP_MEMORY, prodQueuePolicy, input.getProdBufferAssertLevel()));
    DbusEventBuffer consEventBuffer = new DbusEventBuffer(getConfig(sharedBufferSize, individualBufferSize, indexSize, stagingBufferSize, AllocationPolicy.HEAP_MEMORY, consQueuePolicy, input.getConsBufferAssertLevel()));
    // Producer of events, a.k.a. "emitter"
    DbusEventAppender eventProducer = new DbusEventAppender(srcTestEvents, prodEventBuffer, emitterStats, autoStartBuffer);
    // commn channels between reader and writer
    Pipe pipe = Pipe.open();
    Pipe.SinkChannel writerStream = pipe.sink();
    Pipe.SourceChannel readerStream = pipe.source();
    writerStream.configureBlocking(true);
    readerStream.configureBlocking(false);
    // Event writer - Relay in the real world
    int batchSize = input.getBatchSize() * eventSize;
    DbusEventBufferWriter writer = new DbusEventBufferWriter(prodEventBuffer, writerStream, batchSize, streamStats);
    // Event readers - Clients in the real world
    DbusEventBufferConsumer consumer = new DbusEventBufferConsumer(consEventBuffer, numEvents, input.getDeleteInterval(), dstTestEvents);
    Vector<EventBufferConsumer> consList = new Vector<EventBufferConsumer>();
    consList.add(consumer);
    // Event readers - Clients in the real world
    DbusEventBufferReader reader = new DbusEventBufferReader(consEventBuffer, readerStream, consList, clientStats);
    UncaughtExceptionTrackingThread tEmitter = new UncaughtExceptionTrackingThread(eventProducer, "EventProducer");
    UncaughtExceptionTrackingThread tWriter = new UncaughtExceptionTrackingThread(writer, "Writer");
    UncaughtExceptionTrackingThread tReader = new UncaughtExceptionTrackingThread(reader, "Reader");
    UncaughtExceptionTrackingThread tConsumer = new UncaughtExceptionTrackingThread(consumer, "Consumer");
    long emitterWaitms = 20000;
    long writerWaitms = 10000;
    long readerWaitms = 10000;
    long consumerWaitms = readerWaitms;
    // start emitter;
    tEmitter.start();
    // tarnish events written to buffer;
    int[] corruptIndexList = input.getCorruptIndexList();
    if (corruptIndexList.length > 0) {
        tEmitter.join(emitterWaitms);
        EventCorruptionType corruptionType = input.getCorruptionType();
        eventProducer.tarnishEventsInBuffer(corruptIndexList, corruptionType);
    }
    // start  consumer / reader /writer
    tConsumer.start();
    tWriter.start();
    tReader.start();
    // wait until all events have been written;
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): waiting up to " + (emitterWaitms / 1000) + " sec for appender/producer/emitter thread to terminate");
    tEmitter.join(emitterWaitms);
    // try and set a finish for writer
    long eventsEmitted = eventProducer.eventsEmitted();
    writer.setExpectedEvents(eventsEmitted);
    // wait for writer to finish;
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): waiting up to " + (writerWaitms / 1000) + " sec for writer thread to terminate");
    tWriter.join(writerWaitms);
    // close the writer Stream;
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): signalling writer to stop");
    writer.stop();
    if (!tReader.isAlive()) {
        LOG.error("runConstEventsReaderWriter(): reader thread died unexpectedly");
    }
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): waiting up to " + (consumerWaitms / 1000) + " sec for consumer thread to terminate");
    tConsumer.join(consumerWaitms);
    // stop the consumer thread; may or may not have got all events;
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): signalling consumer to stop");
    consumer.stop();
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): signalling reader to stop");
    reader.stop();
    dumpEmitterWriterReaderConsumerState(eventProducer, writer, reader, consumer, emitterStats, streamStats, clientStats, dstTestEvents, prodEventBuffer, consEventBuffer);
    LOG.info("runConstEventsReaderWriter(): all stop.");
    assertEquals(null, consumer.getExceptionThrown());
    LOG.info("runConstEventsReaderWriter() consumer thread: " + (consumer.hasInvalidEvent() ? "DID" : "did NOT") + " receive invalid event(s); num events emitted=" + eventsEmitted + ", events written=" + writer.eventsWritten() + ", events read=" + reader.eventsRead());
    return true;
}

Example 3 with DbusEventBufferReader

use of com.linkedin.databus.core.test.DbusEventBufferReader in project databus by linkedin.

the class TestGenericDispatcher method testShutdownBeforeRollback.

@Test(groups = { "small", "functional" })
public /**
 * 1. Dispatcher is dispatching 2 window of events.
 * 2. First window consumption is successfully done.
 * 3. The second window's onStartDataEventSequence() of the callback registered is blocked (interruptible),
 *    causing the dispatcher to wait.
 * 4. At this instant the dispatcher is shut down. The callback is made to return Failure status which would
 *    cause rollback in normal scenario.
 * 5. As the shutdown message is passed, the blocked callback is expected to be interrupted and no rollback
 *    calls MUST be made.
 */
void testShutdownBeforeRollback() throws Exception {
    final Logger log = Logger.getLogger("TestGenericDispatcher.testShutdownBeforeRollback");
    log.setLevel(Level.INFO);
    // log.getRoot().setLevel(Level.DEBUG);
    LOG.info("start");
    // generate events
    Vector<Short> srcIdList = new Vector<Short>();
    srcIdList.add((short) 1);
    DbusEventGenerator evGen = new DbusEventGenerator(0, srcIdList);
    Vector<DbusEvent> srcTestEvents = new Vector<DbusEvent>();
    final int numEvents = 8;
    final int numEventsPerWindow = 4;
    final int payloadSize = 200;
    Assert.assertTrue(evGen.generateEvents(numEvents, numEventsPerWindow, 500, payloadSize, srcTestEvents) > 0);
    // find out how much data we need to stream for the failure
    // account for the EOW event which is < payload size
    int win1Size = payloadSize - 1;
    for (DbusEvent e : srcTestEvents) {
        win1Size += e.size();
    }
    // serialize the events to a buffer so they can be sent to the client
    final TestGenericDispatcherEventBuffer srcEventsBuf = new TestGenericDispatcherEventBuffer(_generic100KBufferStaticConfig);
    DbusEventAppender eventProducer = new DbusEventAppender(srcTestEvents, srcEventsBuf, null, true);
    Thread tEmitter = new Thread(eventProducer);
    tEmitter.start();
    // Create destination (client) buffer
    final TestGenericDispatcherEventBuffer destEventsBuf = new TestGenericDispatcherEventBuffer(_generic100KBufferStaticConfig);
    /**
     *  Consumer with ability to wait for latch during onStartDataEventSequence()
     */
    class TimeoutDESConsumer extends TimeoutTestConsumer {

        private final CountDownLatch latch = new CountDownLatch(1);

        private int _countStartWindow = 0;

        private final int _failedRequestNumber;

        public TimeoutDESConsumer(int failedRequestNumber) {
            super(1, 1, 0, 0, 0, 0);
            _failedRequestNumber = failedRequestNumber;
        }

        public CountDownLatch getLatch() {
            return latch;
        }

        @Override
        public ConsumerCallbackResult onStartDataEventSequence(SCN startScn) {
            _countStartWindow++;
            if (_countStartWindow == _failedRequestNumber) {
                // Wait for the latch to open
                try {
                    latch.await();
                } catch (InterruptedException e) {
                }
                return ConsumerCallbackResult.ERROR_FATAL;
            }
            return super.onStartDataEventSequence(startScn);
        }

        @Override
        public ConsumerCallbackResult onDataEvent(DbusEvent e, DbusEventDecoder eventDecoder) {
            return ConsumerCallbackResult.SUCCESS;
        }

        public int getNumBeginWindowCalls() {
            return _countStartWindow;
        }
    }
    // Create dispatcher
    // fail on second window
    final TimeoutDESConsumer mockConsumer = new TimeoutDESConsumer(2);
    SelectingDatabusCombinedConsumer sdccMockConsumer = new SelectingDatabusCombinedConsumer((DatabusStreamConsumer) mockConsumer);
    List<String> sources = new ArrayList<String>();
    Map<Long, IdNamePair> sourcesMap = new HashMap<Long, IdNamePair>();
    for (int i = 1; i <= 3; ++i) {
        IdNamePair sourcePair = new IdNamePair((long) i, "source" + i);
        sources.add(sourcePair.getName());
        sourcesMap.put(sourcePair.getId(), sourcePair);
    }
    DatabusV2ConsumerRegistration consumerReg = new DatabusV2ConsumerRegistration(sdccMockConsumer, sources, null);
    List<DatabusV2ConsumerRegistration> allRegistrations = Arrays.asList(consumerReg);
    final ConsumerCallbackStats callbackStats = new ConsumerCallbackStats(0, "test", "test", true, false, null);
    final UnifiedClientStats unifiedStats = new UnifiedClientStats(0, "test", "test.unified");
    MultiConsumerCallback callback = new MultiConsumerCallback(allRegistrations, Executors.newFixedThreadPool(2), // 100 ms budget
    100, new StreamConsumerCallbackFactory(callbackStats, unifiedStats), callbackStats, unifiedStats, null, null);
    callback.setSourceMap(sourcesMap);
    List<DatabusSubscription> subs = DatabusSubscription.createSubscriptionList(sources);
    final RelayDispatcher dispatcher = new RelayDispatcher("dispatcher", _genericRelayConnStaticConfig, subs, new InMemoryPersistenceProvider(), destEventsBuf, callback, null, null, null, null, null);
    final Thread dispatcherThread = new Thread(dispatcher);
    log.info("starting dispatcher thread");
    dispatcherThread.start();
    // Generate RegisterRespone for schema
    HashMap<Long, List<RegisterResponseEntry>> schemaMap = new HashMap<Long, List<RegisterResponseEntry>>();
    List<RegisterResponseEntry> l1 = new ArrayList<RegisterResponseEntry>();
    List<RegisterResponseEntry> l2 = new ArrayList<RegisterResponseEntry>();
    List<RegisterResponseEntry> l3 = new ArrayList<RegisterResponseEntry>();
    l1.add(new RegisterResponseEntry(1L, (short) 1, SOURCE1_SCHEMA_STR));
    l2.add(new RegisterResponseEntry(2L, (short) 1, SOURCE2_SCHEMA_STR));
    l3.add(new RegisterResponseEntry(3L, (short) 1, SOURCE3_SCHEMA_STR));
    schemaMap.put(1L, l1);
    schemaMap.put(2L, l2);
    schemaMap.put(3L, l3);
    // Enqueue Necessary messages before starting dispatch
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesIdsMessage(sourcesMap.values()));
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesSchemasMessage(schemaMap));
    log.info("starting event dispatch");
    // comm channels between reader and writer
    Pipe pipe = Pipe.open();
    Pipe.SinkChannel writerStream = pipe.sink();
    Pipe.SourceChannel readerStream = pipe.source();
    writerStream.configureBlocking(true);
    /*
       *  Needed for DbusEventBuffer.readEvents() to exit their loops when no more data is available.
       *  With Pipe mimicking ChunkedBodyReadableByteChannel, we need to make Pipe non-blocking on the
       *  reader side to achieve the behavior that ChunkedBodyReadableByte channel provides.
       */
    readerStream.configureBlocking(false);
    // Event writer - Relay in the real world
    Checkpoint cp = Checkpoint.createFlexibleCheckpoint();
    // Event readers - Clients in the real world
    // Checkpoint pullerCheckpoint = Checkpoint.createFlexibleCheckpoint();
    DbusEventsStatisticsCollector clientStats = new DbusEventsStatisticsCollector(0, "client", true, false, null);
    DbusEventBufferReader reader = new DbusEventBufferReader(destEventsBuf, readerStream, null, clientStats);
    UncaughtExceptionTrackingThread tReader = new UncaughtExceptionTrackingThread(reader, "Reader");
    tReader.setDaemon(true);
    tReader.start();
    try {
        log.info("send both windows");
        StreamEventsResult streamRes = srcEventsBuf.streamEvents(cp, writerStream, new StreamEventsArgs(win1Size));
        // EOP events, presumably?
        Assert.assertEquals(// EOP events, presumably?
        "num events streamed should equal total number of events plus 2", numEvents + 2, streamRes.getNumEventsStreamed());
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                return 2 == mockConsumer.getNumBeginWindowCalls();
            }
        }, "second window processing started", 5000, log);
        dispatcher.shutdown();
        // remove the barrier
        mockConsumer.getLatch().countDown();
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                return !dispatcherThread.isAlive();
            }
        }, "Ensure Dispatcher thread is shutdown", 5000, log);
        TestUtil.assertWithBackoff(new ConditionCheck() {

            @Override
            public boolean check() {
                return 0 == mockConsumer.getNumRollbacks();
            }
        }, "Ensure No Rollback is called", 10, log);
    } finally {
        reader.stop();
    }
    log.info("end\n");
}