Examples with SelectingDatabusCombinedConsumer com.linkedin.databus.client.consumer.SelectingDatabusCombinedConsumer used on opensource projects

Example 11 with SelectingDatabusCombinedConsumer

use of com.linkedin.databus.client.consumer.SelectingDatabusCombinedConsumer 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");
}

Example 12 with SelectingDatabusCombinedConsumer

use of com.linkedin.databus.client.consumer.SelectingDatabusCombinedConsumer in project databus by linkedin.

the class TestGenericDispatcher method testTwoWindowEventIndependentConsumersCallbackFailure.

@Test(groups = { "small", "functional" })
public void testTwoWindowEventIndependentConsumersCallbackFailure() {
    final Logger log = Logger.getLogger("TestGenericDispatcher.testTwoWindowEventIndependentConsumersCallbackFailure");
    log.info("start");
    int source1EventsNum = 4;
    int source2EventsNum = 5;
    Hashtable<Long, AtomicInteger> keyCounts = new Hashtable<Long, AtomicInteger>();
    Hashtable<Short, AtomicInteger> srcidCounts = new Hashtable<Short, AtomicInteger>();
    final TestGenericDispatcherEventBuffer eventsBuf = new TestGenericDispatcherEventBuffer(_generic100KBufferStaticConfig);
    eventsBuf.start(0);
    eventsBuf.startEvents();
    initBufferWithEvents(eventsBuf, 1, source1EventsNum, (short) 1, keyCounts, srcidCounts);
    eventsBuf.endEvents(100L);
    eventsBuf.startEvents();
    initBufferWithEvents(eventsBuf, 1 + source1EventsNum, source2EventsNum, (short) 2, keyCounts, srcidCounts);
    eventsBuf.endEvents(200L);
    DatabusStreamConsumer mockConsumer = new EventCountingConsumer(new StateVerifyingStreamConsumer(new DataSourceFailingStreamConsumer("source2")), keyCounts, srcidCounts);
    SelectingDatabusCombinedConsumer sdccMockConsumer = new SelectingDatabusCombinedConsumer(mockConsumer);
    Hashtable<Long, AtomicInteger> keyCounts2 = new Hashtable<Long, AtomicInteger>();
    Hashtable<Short, AtomicInteger> srcidCounts2 = new Hashtable<Short, AtomicInteger>();
    for (Long key : keyCounts.keySet()) {
        keyCounts2.put(key, new AtomicInteger(0));
    }
    for (Short srcid : srcidCounts.keySet()) {
        srcidCounts2.put(srcid, new AtomicInteger(0));
    }
    DatabusStreamConsumer mockConsumer2 = new EventCountingConsumer(new StateVerifyingStreamConsumer(null), keyCounts2, srcidCounts2);
    SelectingDatabusCombinedConsumer sdccMockConsumer2 = new SelectingDatabusCombinedConsumer(mockConsumer2);
    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);
    DatabusV2ConsumerRegistration consumerReg2 = new DatabusV2ConsumerRegistration(sdccMockConsumer2, sources, null);
    List<DatabusV2ConsumerRegistration> allRegistrations = Arrays.asList(consumerReg, consumerReg2);
    MultiConsumerCallback callback = new MultiConsumerCallback(allRegistrations, Executors.newSingleThreadExecutor(), 1000, new StreamConsumerCallbackFactory(null, null), null, null, null, null);
    callback.setSourceMap(sourcesMap);
    List<DatabusSubscription> subs = DatabusSubscription.createSubscriptionList(sources);
    RelayDispatcher dispatcher = new RelayDispatcher("dispatcher", _genericRelayConnStaticConfig, subs, new InMemoryPersistenceProvider(), eventsBuf, callback, null, null, null, null, null);
    Thread dispatcherThread = new Thread(dispatcher);
    //dispatcherThread.setDaemon(true);
    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));
    try {
        Thread.sleep(2000);
    } catch (InterruptedException ie) {
    }
    dispatcher.shutdown();
    for (long i = 1; i <= source1EventsNum; ++i) {
        assertEquals("correct amount of callbacks for key " + i, 1, keyCounts.get(i).intValue());
        assertEquals("correct amount of callbacks for key " + i, 1, keyCounts2.get(i).intValue());
    }
    for (long i = source2EventsNum + 1; i <= source1EventsNum + source2EventsNum; ++i) {
        assert keyCounts.get(1L + source1EventsNum).intValue() == 0 : "correct amount of callbacks for key " + i + ":" + keyCounts.get(i).intValue();
    }
    verifyNoLocks(null, eventsBuf);
    log.info("end\n");
}