Examples with SupplierFunction org.apache.samza.operators.functions.SupplierFunction used on opensource projects

Example 1 with SupplierFunction

use of org.apache.samza.operators.functions.SupplierFunction in project samza by apache.

the class TestMessageStreamImpl method testWindowWithRelaxedTypes.

@Test
public void testWindowWithRelaxedTypes() throws Exception {
    StreamApplicationDescriptorImpl mockGraph = mock(StreamApplicationDescriptorImpl.class);
    OperatorSpec mockOpSpec = mock(OperatorSpec.class);
    MessageStream<TestInputMessageEnvelope> inputStream = new MessageStreamImpl<>(mockGraph, mockOpSpec);
    MapFunction<TestMessageEnvelope, String> keyExtractor = m -> m.getKey();
    FoldLeftFunction<TestMessageEnvelope, Integer> aggregator = (m, c) -> c + 1;
    SupplierFunction<Integer> initialValue = () -> 0;
    // should compile since TestMessageEnvelope (input for functions) is base class of TestInputMessageEnvelope (M)
    Window<TestInputMessageEnvelope, String, Integer> window = Windows.keyedTumblingWindow(keyExtractor, Duration.ofHours(1), initialValue, aggregator, null, mock(Serde.class));
    MessageStream<WindowPane<String, Integer>> windowedStream = inputStream.window(window, "w1");
    ArgumentCaptor<OperatorSpec> registeredOpCaptor = ArgumentCaptor.forClass(OperatorSpec.class);
    verify(mockOpSpec).registerNextOperatorSpec(registeredOpCaptor.capture());
    OperatorSpec<?, TestMessageEnvelope> registeredOpSpec = registeredOpCaptor.getValue();
    assertTrue(registeredOpSpec instanceof WindowOperatorSpec);
    assertEquals(OpCode.WINDOW, registeredOpSpec.getOpCode());
    assertEquals(window, ((WindowOperatorSpec) registeredOpSpec).getWindow());
}

Example 2 with SupplierFunction

use of org.apache.samza.operators.functions.SupplierFunction in project samza by apache.

the class LogicalAggregateTranslator method translate.

void translate(final LogicalAggregate aggregate, final TranslatorContext context) {
    validateAggregateFunctions(aggregate);
    MessageStream<SamzaSqlRelMessage> inputStream = context.getMessageStream(aggregate.getInput().getId());
    // At this point, the assumption is that only count function is supported.
    SupplierFunction<Long> initialValue = () -> (long) 0;
    FoldLeftFunction<SamzaSqlRelMessage, Long> foldCountFn = (m, c) -> c + 1;
    final ArrayList<String> aggFieldNames = getAggFieldNames(aggregate);
    MessageStream<SamzaSqlRelMessage> outputStream = inputStream.map(new TranslatorInputMetricsMapFunction(logicalOpId)).window(Windows.keyedTumblingWindow(m -> m, Duration.ofMillis(context.getExecutionContext().getSamzaSqlApplicationConfig().getWindowDurationMs()), initialValue, foldCountFn, new SamzaSqlRelMessageSerdeFactory.SamzaSqlRelMessageSerde(), new LongSerde()).setAccumulationMode(AccumulationMode.DISCARDING), changeLogStorePrefix + "_tumblingWindow_" + logicalOpId).map(windowPane -> {
        List<String> fieldNames = windowPane.getKey().getKey().getSamzaSqlRelRecord().getFieldNames();
        List<Object> fieldValues = windowPane.getKey().getKey().getSamzaSqlRelRecord().getFieldValues();
        fieldNames.add(aggFieldNames.get(0));
        fieldValues.add(windowPane.getMessage());
        return new SamzaSqlRelMessage(fieldNames, fieldValues, new SamzaSqlRelMsgMetadata(0L, 0L));
    });
    context.registerMessageStream(aggregate.getId(), outputStream);
    outputStream.map(new TranslatorOutputMetricsMapFunction(logicalOpId));
}

Example 3 with SupplierFunction

use of org.apache.samza.operators.functions.SupplierFunction 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 4 with SupplierFunction

use of org.apache.samza.operators.functions.SupplierFunction 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);
}