Examples with KafkaInputDescriptor org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor used on opensource projects

Example 1 with KafkaInputDescriptor

use of org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor in project samza by apache.

the class RepartitionJoinWindowApp method describe.

@Override
public void describe(StreamApplicationDescriptor appDescriptor) {
    // offset.default = oldest required for tests since checkpoint topic is empty on start and messages are published
    // before the application is run
    Config config = appDescriptor.getConfig();
    String inputTopic1 = config.get(INPUT_TOPIC_1_CONFIG_KEY);
    String inputTopic2 = config.get(INPUT_TOPIC_2_CONFIG_KEY);
    String outputTopic = config.get(OUTPUT_TOPIC_CONFIG_KEY);
    KafkaSystemDescriptor ksd = new KafkaSystemDescriptor(SYSTEM);
    KafkaInputDescriptor<PageView> id1 = ksd.getInputDescriptor(inputTopic1, new JsonSerdeV2<>(PageView.class));
    KafkaInputDescriptor<AdClick> id2 = ksd.getInputDescriptor(inputTopic2, new JsonSerdeV2<>(AdClick.class));
    MessageStream<PageView> pageViews = appDescriptor.getInputStream(id1);
    MessageStream<AdClick> adClicks = appDescriptor.getInputStream(id2);
    MessageStream<KV<String, PageView>> pageViewsRepartitionedByViewId = pageViews.partitionBy(PageView::getViewId, pv -> pv, new KVSerde<>(new StringSerde(), new JsonSerdeV2<>(PageView.class)), "pageViewsByViewId");
    MessageStream<PageView> pageViewsRepartitionedByViewIdValueONly = pageViewsRepartitionedByViewId.map(KV::getValue);
    MessageStream<KV<String, AdClick>> adClicksRepartitionedByViewId = adClicks.partitionBy(AdClick::getViewId, ac -> ac, new KVSerde<>(new StringSerde(), new JsonSerdeV2<>(AdClick.class)), "adClicksByViewId");
    MessageStream<AdClick> adClicksRepartitionedByViewIdValueOnly = adClicksRepartitionedByViewId.map(KV::getValue);
    MessageStream<UserPageAdClick> userPageAdClicks = pageViewsRepartitionedByViewIdValueONly.join(adClicksRepartitionedByViewIdValueOnly, new UserPageViewAdClicksJoiner(), new StringSerde(), new JsonSerdeV2<>(PageView.class), new JsonSerdeV2<>(AdClick.class), Duration.ofMinutes(1), "pageViewAdClickJoin");
    MessageStream<KV<String, UserPageAdClick>> userPageAdClicksByUserId = userPageAdClicks.partitionBy(UserPageAdClick::getUserId, upac -> upac, KVSerde.of(new StringSerde(), new JsonSerdeV2<>(UserPageAdClick.class)), "userPageAdClicksByUserId");
    userPageAdClicksByUserId.map(KV::getValue).window(Windows.keyedSessionWindow(UserPageAdClick::getUserId, Duration.ofSeconds(3), new StringSerde(), new JsonSerdeV2<>(UserPageAdClick.class)), "userAdClickWindow").map(windowPane -> KV.of(windowPane.getKey().getKey(), String.valueOf(windowPane.getMessage().size()))).sink((message, messageCollector, taskCoordinator) -> {
        taskCoordinator.commit(TaskCoordinator.RequestScope.ALL_TASKS_IN_CONTAINER);
        messageCollector.send(new OutgoingMessageEnvelope(new SystemStream("kafka", outputTopic), null, message.getKey(), message.getValue()));
    });
    intermediateStreamIds.add(((IntermediateMessageStreamImpl) pageViewsRepartitionedByViewId).getStreamId());
    intermediateStreamIds.add(((IntermediateMessageStreamImpl) adClicksRepartitionedByViewId).getStreamId());
    intermediateStreamIds.add(((IntermediateMessageStreamImpl) userPageAdClicksByUserId).getStreamId());
}

Example 2 with KafkaInputDescriptor

use of org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor in project samza by apache.

the class SessionWindowApp method describe.

@Override
public void describe(StreamApplicationDescriptor appDescriptor) {
    JsonSerdeV2<PageView> inputSerde = new JsonSerdeV2<>(PageView.class);
    KVSerde<String, Integer> outputSerde = KVSerde.of(new StringSerde(), new IntegerSerde());
    KafkaSystemDescriptor ksd = new KafkaSystemDescriptor(SYSTEM);
    KafkaInputDescriptor<PageView> id = ksd.getInputDescriptor(INPUT_TOPIC, inputSerde);
    KafkaOutputDescriptor<KV<String, Integer>> od = ksd.getOutputDescriptor(OUTPUT_TOPIC, outputSerde);
    MessageStream<PageView> pageViews = appDescriptor.getInputStream(id);
    OutputStream<KV<String, Integer>> outputStream = appDescriptor.getOutputStream(od);
    pageViews.filter(m -> !FILTER_KEY.equals(m.getUserId())).window(Windows.keyedSessionWindow(PageView::getUserId, Duration.ofSeconds(3), new StringSerde(), new JsonSerdeV2<>(PageView.class)), "sessionWindow").map(m -> KV.of(m.getKey().getKey(), m.getMessage().size())).sendTo(outputStream);
}

Example 3 with KafkaInputDescriptor

use of org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor in project samza by apache.

the class TumblingWindowApp method describe.

@Override
public void describe(StreamApplicationDescriptor appDescriptor) {
    JsonSerdeV2<PageView> inputSerde = new JsonSerdeV2<>(PageView.class);
    KVSerde<String, Integer> outputSerde = KVSerde.of(new StringSerde(), new IntegerSerde());
    KafkaSystemDescriptor ksd = new KafkaSystemDescriptor(SYSTEM);
    KafkaInputDescriptor<PageView> id = ksd.getInputDescriptor(INPUT_TOPIC, inputSerde);
    KafkaOutputDescriptor<KV<String, Integer>> od = ksd.getOutputDescriptor(OUTPUT_TOPIC, outputSerde);
    MessageStream<PageView> pageViews = appDescriptor.getInputStream(id);
    OutputStream<KV<String, Integer>> outputStream = appDescriptor.getOutputStream(od);
    pageViews.filter(m -> !FILTER_KEY.equals(m.getUserId())).window(Windows.keyedTumblingWindow(PageView::getUserId, Duration.ofSeconds(3), new StringSerde(), new JsonSerdeV2<>(PageView.class)), "tumblingWindow").map(m -> KV.of(m.getKey().getKey(), m.getMessage().size())).sendTo(outputStream);
}

Example 4 with KafkaInputDescriptor

use of org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor in project samza by apache.

the class WindowExample method describe.

@Override
public void describe(StreamApplicationDescriptor appDescriptor) {
    KafkaSystemDescriptor trackingSystem = new KafkaSystemDescriptor("tracking");
    KafkaInputDescriptor<PageViewEvent> inputStreamDescriptor = trackingSystem.getInputDescriptor("pageViewEvent", new JsonSerdeV2<>(PageViewEvent.class));
    KafkaOutputDescriptor<Integer> outputStreamDescriptor = trackingSystem.getOutputDescriptor("pageViewEventPerMember", new IntegerSerde());
    SupplierFunction<Integer> initialValue = () -> 0;
    FoldLeftFunction<PageViewEvent, Integer> counter = (m, c) -> c == null ? 1 : c + 1;
    MessageStream<PageViewEvent> inputStream = appDescriptor.getInputStream(inputStreamDescriptor);
    OutputStream<Integer> outputStream = appDescriptor.getOutputStream(outputStreamDescriptor);
    // create a tumbling window that outputs the number of message collected every 10 minutes.
    // also emit early results if either the number of messages collected reaches 30000, or if no new messages arrive
    // for 1 minute.
    inputStream.window(Windows.tumblingWindow(Duration.ofMinutes(10), initialValue, counter, new IntegerSerde()).setLateTrigger(Triggers.any(Triggers.count(30000), Triggers.timeSinceLastMessage(Duration.ofMinutes(1)))), "window").map(WindowPane::getMessage).sendTo(outputStream);
}

Example 5 with KafkaInputDescriptor

use of org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor in project samza by apache.

the class PageViewCounterExample method describe.

@Override
public void describe(StreamApplicationDescriptor appDescriptor) {
    KafkaSystemDescriptor trackingSystem = new KafkaSystemDescriptor("tracking");
    KafkaInputDescriptor<PageViewEvent> inputStreamDescriptor = trackingSystem.getInputDescriptor("pageViewEvent", new JsonSerdeV2<>(PageViewEvent.class));
    KafkaOutputDescriptor<KV<String, PageViewCount>> outputStreamDescriptor = trackingSystem.getOutputDescriptor("pageViewEventPerMember", KVSerde.of(new StringSerde(), new JsonSerdeV2<>(PageViewCount.class)));
    MessageStream<PageViewEvent> pageViewEvents = appDescriptor.getInputStream(inputStreamDescriptor);
    OutputStream<KV<String, PageViewCount>> pageViewEventPerMemberStream = appDescriptor.getOutputStream(outputStreamDescriptor);
    SupplierFunction<Integer> initialValue = () -> 0;
    FoldLeftFunction<PageViewEvent, Integer> foldLeftFn = (m, c) -> c + 1;
    pageViewEvents.window(Windows.keyedTumblingWindow(PageViewEvent::getMemberId, Duration.ofSeconds(10), initialValue, foldLeftFn, null, null).setEarlyTrigger(Triggers.repeat(Triggers.count(5))).setAccumulationMode(AccumulationMode.DISCARDING), "tumblingWindow").map(windowPane -> KV.of(windowPane.getKey().getKey(), buildPageViewCount(windowPane))).sendTo(pageViewEventPerMemberStream);
}