Examples with KafkaConsumer com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer used on opensource projects

Example 1 with KafkaConsumer

use of com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer in project streamsx.topology by IBMStreams.

the class KafkaSample method publishSubscribe.

/**
 * Publish some messages to a topic, scribe to the topic and report
 * received messages.
 * @param contextType string value of a {@code StreamsContext.Type}
 * @throws Exception
 */
public void publishSubscribe(String contextType) throws Exception {
    setupConfig();
    identifyStreamsxMessagingVer();
    Topology top = new Topology("kafkaSample");
    String groupId = newGroupId(top.getName());
    Supplier<String> topic = new Value<String>(TOPIC);
    KafkaProducer producer = new KafkaProducer(top, createProducerConfig());
    KafkaConsumer consumer = new KafkaConsumer(top, createConsumerConfig(groupId));
    TStream<Message> msgs = makeStreamToPublish(top);
    // for the sample, give the consumer a chance to become ready
    msgs = msgs.modify(initialDelayFunc(PUB_DELAY_MSEC));
    producer.publish(msgs, topic);
    TStream<Message> rcvdMsgs = consumer.subscribe(topic);
    // show what we received
    rcvdMsgs.print();
    // Execute the topology, to send and receive the messages.
    Future<?> future = StreamsContextFactory.getStreamsContext(contextType).submit(top, config);
    if (contextType.contains("DISTRIBUTED")) {
        System.out.println("\nSee the job's PE console logs for the topology output.\n");
    } else if (contextType.contains("STANDALONE") || contextType.contains("EMBEDDED")) {
        Thread.sleep(15000);
        future.cancel(true);
    }
}

Example 2 with KafkaConsumer

use of com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer in project streamsx.topology by IBMStreams.

the class KafkaStreamsTest method testMultiTopicProducer.

@Test
public void testMultiTopicProducer() throws Exception {
    checkAssumes();
    // streamsx.messaging issue#118 prevents successful execution
    // For standalone it seems to consistently get 0 topic1 msgs.
    assumeTrue(getTesterType() != StreamsContext.Type.STANDALONE_TESTER);
    Topology top = new Topology("testMultiTopicProducer");
    MsgGenerator mgen = new MsgGenerator(top.getName());
    String groupId = newGroupId(top.getName());
    String[] topics = getKafkaTopics();
    String topic1Val = topics[0];
    String topic2Val = topics[1];
    Supplier<String> topic1 = new Value<String>(topic1Val);
    Supplier<String> topic2 = new Value<String>(topic2Val);
    KafkaProducer producer = new KafkaProducer(top, createProducerConfig());
    KafkaConsumer consumer = new KafkaConsumer(top, createConsumerConfig(groupId));
    // Test producer that publishes to multiple topics (implies implicit topic)
    List<Message> topic1Msgs = new ArrayList<>();
    topic1Msgs.add(new SimpleMessage(mgen.create(topic1Val, "Hello"), null, topic1Val));
    topic1Msgs.add(new SimpleMessage(mgen.create(topic1Val, "Are you there?"), null, topic1Val));
    List<Message> topic2Msgs = new ArrayList<>();
    topic2Msgs.add(new SimpleMessage(mgen.create(topic2Val, "Hello"), null, topic2Val));
    topic2Msgs.add(new SimpleMessage(mgen.create(topic2Val, "Are you there?"), null, topic2Val));
    List<Message> msgs = new ArrayList<>(topic1Msgs);
    msgs.addAll(topic2Msgs);
    TStream<Message> msgsToPublish = top.constants(msgs);
    msgsToPublish = msgsToPublish.modify(new InitialDelay<Message>(PUB_DELAY_MSEC));
    producer.publish(msgsToPublish);
    TStream<Message> rcvdTopic1Msgs = consumer.subscribe(topic1);
    TStream<Message> rcvdTopic2Msgs = consumer.subscribe(topic2);
    // for validation...
    TStream<Message> rcvdMsgs = rcvdTopic1Msgs.union(rcvdTopic2Msgs);
    rcvdMsgs.print();
    // just our msgs
    rcvdMsgs = selectMsgs(rcvdMsgs, mgen.pattern());
    TStream<String> rcvdAsString = rcvdMsgs.transform(msgToJSONStringFunc());
    List<String> expectedAsString = mapList(msgs, msgToJSONStringFunc());
    setupDebug();
    if (testBuildOnly(top))
        return;
    completeAndValidateUnordered(groupId, top, rcvdAsString, SEC_TIMEOUT, expectedAsString.toArray(new String[0]));
}

Example 3 with KafkaConsumer

use of com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer in project streamsx.topology by IBMStreams.

the class KafkaStreamsTest method testImplicitTopicProducer.

@Test
public void testImplicitTopicProducer() throws Exception {
    checkAssumes();
    Topology top = new Topology("testImplicitTopicProducer");
    MsgGenerator mgen = new MsgGenerator(top.getName());
    String groupId = newGroupId(top.getName());
    String topicVal = getKafkaTopics()[0];
    Supplier<String> topic = new Value<String>(topicVal);
    KafkaProducer producer = new KafkaProducer(top, createProducerConfig());
    KafkaConsumer consumer = new KafkaConsumer(top, createConsumerConfig(groupId));
    // Test producer that takes an arbitrary TStream<T> and implicit topic
    List<Vals> msgs = new ArrayList<>();
    msgs.add(new Vals(mgen.create(topicVal, "Hello"), null, null));
    msgs.add(new Vals(mgen.create(topicVal, "key1", "Are you there?"), "key1", null));
    TStream<Vals> valsToPublish = top.constants(msgs).asType(Vals.class);
    TStream<Message> msgsToPublish = valsToPublish.transform(msgFromValsFunc(topicVal));
    msgsToPublish = msgsToPublish.modify(new InitialDelay<Message>(PUB_DELAY_MSEC));
    producer.publish(msgsToPublish);
    TStream<Message> rcvdMsgs = consumer.subscribe(topic);
    // for validation...
    rcvdMsgs.print();
    // just our msgs
    rcvdMsgs = selectMsgs(rcvdMsgs, mgen.pattern());
    TStream<String> rcvdAsString = rcvdMsgs.transform(msgToJSONStringFunc());
    List<Message> expectedAsMessage = mapList(msgs, msgFromValsFunc(topicVal));
    List<String> expectedAsString = mapList(expectedAsMessage, msgToJSONStringFunc());
    setupDebug();
    if (testBuildOnly(top))
        return;
    completeAndValidate(groupId, top, rcvdAsString, SEC_TIMEOUT, expectedAsString.toArray(new String[0]));
}

Example 4 with KafkaConsumer

use of com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer in project streamsx.topology by IBMStreams.

the class KafkaStreamsTest method testSubscribeNullThreadsPerTopic.

@Test(expected = IllegalArgumentException.class)
public void testSubscribeNullThreadsPerTopic() throws Exception {
    Topology top = new Topology("testSubscribeNullThreadsPerTopic");
    KafkaConsumer consumer = new KafkaConsumer(top, createConsumerConfig("group"));
    // throws IAE
    consumer.subscribe(null, new Value<String>("topic"));
}

Example 5 with KafkaConsumer

use of com.ibm.streamsx.topology.messaging.kafka.KafkaConsumer in project streamsx.topology by IBMStreams.

the class KafkaStreamsTest method testSubscribeNullTopic.

@Test(expected = IllegalArgumentException.class)
public void testSubscribeNullTopic() throws Exception {
    Topology top = new Topology("testSubscribeNullTopic");
    KafkaConsumer consumer = new KafkaConsumer(top, createConsumerConfig("group"));
    // throws IAE
    consumer.subscribe(null);
}