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

Example 6 with DbusEventAppender

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

the class ReadEventsTestParams method testHeadDrift.

/**
 * TestCase to recreate the bug (DDSDBUS-387) where SCNIndex.head and EVB.Head do not match.
 */
@Test
public void testHeadDrift() throws Exception {
    // DbusEventBuffer.LOG.setLevel(Level.DEBUG);
    DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(10000, 10000, 320, 500, AllocationPolicy.HEAP_MEMORY, QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(215, 5, 100, 10, events);
    // Add events to the EventBuffer
    DbusEventAppender appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();
    LOG.info("Dbus Event Buffer is :" + dbusBuf);
    LOG.info("SCNIndex is :" + dbusBuf.getScnIndex());
    assertEquals("ScnIndex Head Location", 256, dbusBuf.getScnIndex().getHead());
    assertEquals("ScnIndex Tail Location", 256, dbusBuf.getScnIndex().getTail());
    assertEquals("EVB Head Location", 8381, dbusBuf.getHead());
    long oldEVBTail = 40733;
    assertEquals("EVB Tail Location", oldEVBTail, dbusBuf.getTail());
    dbusBuf.getScnIndex().printVerboseString(LOG, Level.DEBUG);
    long lastScn = events.get(events.size() - 1).sequence();
    generator = new DbusEventGenerator(lastScn + 1);
    events = new Vector<DbusEvent>();
    generator.generateEvents(3, 3, 80, 10, events);
    appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();
    // Ensure SCNINdex tail did not move.
    assertEquals("ScnIndex Head Location", 256, dbusBuf.getScnIndex().getHead());
    assertEquals("ScnIndex Tail Location", 256, dbusBuf.getScnIndex().getTail());
    assertEquals("EVB Head Location", 8381, dbusBuf.getHead());
    long newEVBTail = 41068;
    assertEquals("EVB Tail Location", newEVBTail, dbusBuf.getTail());
    // Make sure the EVB Tail did move. Old EVB Tail belongs to SCNINdex blockNumber 15 and new EVB tail to blockNumber 16
    assertEquals("Old EVB Tail's index block", 15, dbusBuf.getScnIndex().getBlockNumber(oldEVBTail));
    assertEquals("New EVB Tail's index block", 16, dbusBuf.getScnIndex().getBlockNumber(newEVBTail));
}

Example 7 with DbusEventAppender

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

the class ReadEventsTestParams method testAppendEventOverlapNgt0.

// Case when n> 0
@Test
public void testAppendEventOverlapNgt0() throws Exception {
    final DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(1145, 5000, 100, 500, AllocationPolicy.HEAP_MEMORY, QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(9, 3, 120, 39, events);
    // Add events to the EventBuffer. Now the buffer is full
    DbusEventAppender appender = new DbusEventAppender(events, dbusBuf, null);
    // running in the same thread
    appender.run();
    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
    long headPos = dbusBuf.getHead();
    long tailPos = dbusBuf.getTail();
    long scnIndexHead = dbusBuf.getScnIndex().getHead();
    long scnIndexTail = dbusBuf.getScnIndex().getTail();
    long headGenId = parser.bufferGenId(headPos);
    long headIndexId = parser.bufferIndex(headPos);
    long headOffset = parser.bufferOffset(headPos);
    long tailGenId = parser.bufferGenId(tailPos);
    long tailIndexId = parser.bufferIndex(tailPos);
    long tailOffset = parser.bufferOffset(tailPos);
    assertEquals("Head GenId", 0, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 0, headOffset);
    assertEquals("Tail GenId", 0, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 1144, tailOffset);
    assertEquals("SCNIndex Head", 0, scnIndexHead);
    assertEquals("SCNIndex Tail", 80, scnIndexTail);
    headPos = parser.setGenId(headPos, 300);
    tailPos = parser.setGenId(tailPos, 300);
    dbusBuf.setHead(headPos);
    dbusBuf.setTail(tailPos);
    dbusBuf.recreateIndex();
    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(1000);
    /*
     * The event size is carefully created such that after adding 2nd
     * event CWP and tail points to the same location. Now the 3rd event corrupts the EVB and index (in the presence of bug).
     */
    generator.generateEvents(3, 2, 150, 89, events);
    appender = new DbusEventAppender(events, dbusBuf, null);
    LOG.info("1");
    // Logger.getRootLogger().setLevel(Level.ALL);
    // running in the same thread
    appender.run();
    LOG.info("2");
    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
    headPos = dbusBuf.getHead();
    tailPos = dbusBuf.getTail();
    headGenId = parser.bufferGenId(headPos);
    headIndexId = parser.bufferIndex(headPos);
    headOffset = parser.bufferOffset(headPos);
    tailGenId = parser.bufferGenId(tailPos);
    tailIndexId = parser.bufferIndex(tailPos);
    tailOffset = parser.bufferOffset(tailPos);
    scnIndexHead = dbusBuf.getScnIndex().getHead();
    scnIndexTail = dbusBuf.getScnIndex().getTail();
    assertEquals("Head GenId", 300, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 783, headOffset);
    assertEquals("Tail GenId", 301, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 633, tailOffset);
    assertEquals("SCNIndex Head", 64, scnIndexHead);
    assertEquals("SCNIndex Tail", 48, scnIndexTail);
}

Example 8 with DbusEventAppender

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

the class ReadEventsTestParams method testBufferOverFlow.

/*
   * TestCase to recreate the BufferOverFlowException issue tracked in DDS-793
   */
@Test
public void testBufferOverFlow() throws Exception {
    // DbusEventBuffer.LOG.setLevel(Level.DEBUG);
    final Logger log = Logger.getLogger("TestDbusEventBuffer.testBufferOverflow");
    // log.setLevel(Level.INFO);
    log.info("starting");
    DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(1000, 1000, 100, 500, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE, AssertLevel.ALL));
    final DbusEventBuffer dbusBuf2 = new DbusEventBuffer(getConfig(2000, 2000, 100, 1000, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE, AssertLevel.NONE));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    final BufferPositionParser parser2 = dbusBuf2.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(12, 12, 100, 10, events);
    log.info("generate sample events to the EventBuffer");
    DbusEventAppender appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();
    log.info("dbusBuf : Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
    ByteBuffer[] buf = dbusBuf.getBuffer();
    byte[] b = new byte[(int) dbusBuf.getTail()];
    buf[0].position(0);
    buf[0].get(b);
    log.info("copy data to the destination buffer: 1");
    ReadableByteChannel rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    dbusBuf2.readEvents(rChannel);
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    rChannel.close();
    log.info("copy data to the destination buffer: 2");
    rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    dbusBuf2.readEvents(rChannel);
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("Buffer Size is :" + dbusBuf2.getBuffer().length);
    rChannel.close();
    log.info("process data in destination buffer: 1");
    DbusEventBuffer.DbusEventIterator itr = dbusBuf2.acquireIterator("dummy1");
    for (int i = 0; i < 15; i++) {
        itr.next();
        itr.remove();
    }
    itr.close();
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("copy data to the destination buffer: 3");
    rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    dbusBuf2.readEvents(rChannel);
    ByteBuffer[] buf2 = dbusBuf2.getBuffer();
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("dbusBuf2 : Buffer :" + buf2[0]);
    rChannel.close();
    log.info("process data in destination buffer: 2");
    itr = dbusBuf2.acquireIterator("dummy2");
    for (int i = 0; i < 15; i++) {
        itr.next();
        itr.remove();
    }
    itr.close();
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("dbusBuf2 : Buffer :" + buf2[0]);
    log.info("generate more sample events to the EventBuffer");
    dbusBuf = new DbusEventBuffer(getConfig(2000, 2000, 100, 500, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE, AssertLevel.ALL));
    events = new Vector<DbusEvent>();
    generator.generateEvents(8, 9, 150, 52, events);
    log.info("Events Size is :" + events.get(0).size());
    appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();
    final AtomicBoolean stopReader = new AtomicBoolean(false);
    Runnable reader = new Runnable() {

        @Override
        public void run() {
            try {
                Thread.sleep(5 * 1000);
            } catch (InterruptedException ie) {
            }
            DbusEventBuffer.DbusEventIterator itr = dbusBuf2.acquireIterator("dummy3");
            log.info("Reader iterator:" + itr);
            while (!stopReader.get() || itr.hasNext()) {
                while (itr.hasNext()) {
                    itr.next();
                    itr.remove();
                }
                itr.await(100, TimeUnit.MILLISECONDS);
            }
            itr.close();
            log.info("Reader Thread: dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
            ByteBuffer[] buf = dbusBuf2.getBuffer();
            log.info("Reader Tread : dbusBuf2 : Buffer :" + buf[0]);
            log.info("Reader iterator:" + itr);
        }
    };
    log.info("generate sample events to the EventBuffer");
    Thread t = new Thread(reader, "BufferOverflowReader");
    b = new byte[(int) dbusBuf.getTail()];
    buf = dbusBuf.getBuffer();
    buf[0].position(0);
    buf[0].get(b);
    log.info("copy data to the destination buffer: 4");
    log.info("Size is :" + b.length);
    rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    // <=== Overflow happened at this point
    dbusBuf2.readEvents(rChannel);
    rChannel.close();
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("dbusBuf2 : Buffer :" + buf2[0]);
    log.info("test if the readEvents can allow reader to proceed while it is blocked");
    rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    log.info("start reader thread");
    t.start();
    log.info("copy data to the destination buffer: 5");
    dbusBuf2.readEvents(rChannel);
    rChannel.close();
    log.info("data copied to the destination buffer: 5");
    stopReader.set(true);
    t.join(20000);
    log.info("check if dbusBuf2 is empty");
    Assert.assertTrue(!t.isAlive());
    if (!dbusBuf2.empty()) {
        log.error("dbusBuf2 not empty: " + dbusBuf2);
    }
    Assert.assertTrue(dbusBuf2.toString(), dbusBuf2.empty());
    log.info("dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
    log.info("dbusBuf2 : Buffer :" + buf2[0]);
    log.info("done");
}

Example 9 with DbusEventAppender

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

the class ReadEventsTestParams method testBigReadEventBuffer.

@Test
public /*
   * ReadBuffer Size is bigger than the overall EVB size.
   * A large read happens to EVB which is bigger than its size.
   */
void testBigReadEventBuffer() throws Exception {
    final Logger log = Logger.getLogger("TestDbusEventBuffer.testBigReadEventBuffer");
    // log.setLevel(Level.INFO);
    log.info("starting");
    final DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(4000, 4000, 100, 500, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE, AssertLevel.ALL));
    final DbusEventBuffer dbusBuf2 = new DbusEventBuffer(getConfig(1000, 1000, 100, 3000, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE, AssertLevel.NONE));
    // dbusBuf2.getLog().setLevel(Level.DEBUG);
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    final BufferPositionParser parser2 = dbusBuf2.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(24, 24, 100, 10, events);
    log.info("Num Events :" + events.size());
    // Add events to the EventBuffer
    DbusEventAppender appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();
    final AtomicBoolean stopReader = new AtomicBoolean(false);
    log.info("dbusBuf : Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
    class EvbReader implements Runnable {

        private int _count = 0;

        public EvbReader() {
            _count = 0;
        }

        public int getCount() {
            return _count;
        }

        @Override
        public void run() {
            try {
                Thread.sleep(5 * 1000);
            } catch (InterruptedException ie) {
            }
            DbusEventBuffer.DbusEventIterator itr = dbusBuf2.acquireIterator("dummy");
            log.info("Reader iterator:" + itr);
            while (!stopReader.get() || itr.hasNext()) {
                while (itr.hasNext()) {
                    itr.next();
                    itr.remove();
                    _count++;
                }
                itr.await(100, TimeUnit.MILLISECONDS);
            }
            log.info("Reader Thread: dbusBuf2 : Head:" + parser2.toString(dbusBuf2.getHead()) + ",Tail:" + parser2.toString(dbusBuf2.getTail()));
            ByteBuffer[] buf = dbusBuf2.getBuffer();
            log.info("Reader Thread : dbusBuf2 : Buffer :" + buf[0]);
            log.info("Count is :" + _count);
            log.info("Reader iterator:" + itr);
        }
    }
    ;
    EvbReader reader = new EvbReader();
    Thread t = new Thread(reader, "BigReadEventReader");
    ByteBuffer[] buf = dbusBuf.getBuffer();
    byte[] b = new byte[(int) dbusBuf.getTail()];
    buf[0].position(0);
    buf[0].get(b);
    ReadableByteChannel rChannel = Channels.newChannel(new ByteArrayInputStream(b));
    t.start();
    dbusBuf2.readEvents(rChannel);
    stopReader.set(true);
    t.join(20000);
    Assert.assertTrue(!t.isAlive());
    DbusEventBuffer.DbusEventIterator itr2 = dbusBuf2.acquireIterator("dummy");
    int count = 0;
    while (itr2.hasNext()) {
        itr2.next();
        itr2.remove();
        count++;
    }
    log.info("Total Count :" + (count + reader.getCount()));
    log.info("Head :" + dbusBuf2.getHead() + ", Tail :" + dbusBuf2.getTail());
    assertEquals("Total Count", 26, (count + reader.getCount()));
    assertEquals("Head == Tail", dbusBuf2.getHead(), dbusBuf2.getTail());
    assertEquals("Head Check:", 2890, dbusBuf2.getHead());
    log.info("done");
}

Example 10 with DbusEventAppender

use of com.linkedin.databus.core.test.DbusEventAppender 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;
}