Apache Kafka 支持

@Bean
public ProducerFactory<Integer, String> producerFactory() {
    return new DefaultKafkaProducerFactory<>(KafkaTestUtils.producerProps(embeddedKafka));
}

@Bean
public IntegrationFlow sendToKafkaFlow() {
    return f -> f
            .splitWith(s -> s.<String>function(p -> Stream.generate(() -> p).limit(101).iterator()))
            .publishSubscribeChannel(c -> c
                    .subscribe(sf -> sf.handle(
                            kafkaMessageHandler(producerFactory(), TEST_TOPIC1)
                                    .timestampExpression("T(Long).valueOf('1487694048633')"),
                            e -> e.id("kafkaProducer1")))
                    .subscribe(sf -> sf.handle(
                            kafkaMessageHandler(producerFactory(), TEST_TOPIC2)
                                   .timestamp(m -> 1487694048644L),
                            e -> e.id("kafkaProducer2")))
            );
}

@Bean
public DefaultKafkaHeaderMapper mapper() {
    return new DefaultKafkaHeaderMapper();
}

private KafkaProducerMessageHandlerSpec<Integer, String, ?> kafkaMessageHandler(
        ProducerFactory<Integer, String> producerFactory, String topic) {
    return Kafka
            .outboundChannelAdapter(producerFactory)
            .messageKey(m -> m
                    .getHeaders()
                    .get(IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER))
            .headerMapper(mapper())
            .partitionId(m -> 10)
            .topicExpression("headers[kafka_topic] ?: '" + topic + "'")
            .configureKafkaTemplate(t -> t.id("kafkaTemplate:" + topic));
}

@Bean
@ServiceActivator(inputChannel = "toKafka")
public MessageHandler handler() throws Exception {
    KafkaProducerMessageHandler<String, String> handler =
            new KafkaProducerMessageHandler<>(kafkaTemplate());
    handler.setTopicExpression(new LiteralExpression("someTopic"));
    handler.setMessageKeyExpression(new LiteralExpression("someKey"));
    handler.setSuccessChannel(successes());
    handler.setFailureChannel(failures());
    return handler;
}

@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
    return new KafkaTemplate<>(producerFactory());
}

@Bean
public ProducerFactory<String, String> producerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, this.brokerAddress);
    // set more properties
    return new DefaultKafkaProducerFactory<>(props);
}

<int-kafka:outbound-channel-adapter id="kafkaOutboundChannelAdapter"
                                    kafka-template="template"
                                    auto-startup="false"
                                    channel="inputToKafka"
                                    topic="foo"
                                    sync="false"
                                    message-key-expression="'bar'"
                                    send-failure-channel="failures"
                                    send-success-channel="successes"
                                    error-message-strategy="ems"
                                    partition-id-expression="2">
</int-kafka:outbound-channel-adapter>

<bean id="template" class="org.springframework.kafka.core.KafkaTemplate">
    <constructor-arg>
        <bean class="org.springframework.kafka.core.DefaultKafkaProducerFactory">
            <constructor-arg>
                <map>
                    <entry key="bootstrap.servers" value="localhost:9092" />
                    ... <!-- more producer properties -->
                </map>
            </constructor-arg>
        </bean>
    </constructor-arg>
</bean>

@Bean
public IntegrationFlow topic1ListenerFromKafkaFlow() {
    return IntegrationFlow
            .from(Kafka.messageDrivenChannelAdapter(consumerFactory(),
                    KafkaMessageDrivenChannelAdapter.ListenerMode.record, TEST_TOPIC1)
                    .configureListenerContainer(c ->
                            c.ackMode(AbstractMessageListenerContainer.AckMode.MANUAL)
                                    .id("topic1ListenerContainer"))
                    .recoveryCallback(new ErrorMessageSendingRecoverer(errorChannel(),
                            new RawRecordHeaderErrorMessageStrategy()))
                    .retryTemplate(new RetryTemplate())
                    .filterInRetry(true))
            .filter(Message.class, m ->
                            m.getHeaders().get(KafkaHeaders.RECEIVED_MESSAGE_KEY, Integer.class) < 101,
                    f -> f.throwExceptionOnRejection(true))
            .<String, String>transform(String::toUpperCase)
            .channel(c -> c.queue("listeningFromKafkaResults1"))
            .get();
}

@Bean
public KafkaMessageDrivenChannelAdapter<String, String>
            adapter(KafkaMessageListenerContainer<String, String> container) {
    KafkaMessageDrivenChannelAdapter<String, String> kafkaMessageDrivenChannelAdapter =
            new KafkaMessageDrivenChannelAdapter<>(container, ListenerMode.record);
    kafkaMessageDrivenChannelAdapter.setOutputChannel(received());
    return kafkaMessageDrivenChannelAdapter;
}

@Bean
public KafkaMessageListenerContainer<String, String> container() throws Exception {
    ContainerProperties properties = new ContainerProperties(this.topic);
    // set more properties
    return new KafkaMessageListenerContainer<>(consumerFactory(), properties);
}

@Bean
public ConsumerFactory<String, String> consumerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, this.brokerAddress);
    // set more properties
    return new DefaultKafkaConsumerFactory<>(props);
}

<int-kafka:message-driven-channel-adapter
        id="kafkaListener"
        listener-container="container1"
        auto-startup="false"
        phase="100"
        send-timeout="5000"
        mode="record"
        retry-template="template"
        recovery-callback="callback"
        error-message-strategy="ems"
        channel="someChannel"
        error-channel="errorChannel" />

<bean id="container1" class="org.springframework.kafka.listener.KafkaMessageListenerContainer">
    <constructor-arg>
        <bean class="org.springframework.kafka.core.DefaultKafkaConsumerFactory">
            <constructor-arg>
                <map>
                <entry key="bootstrap.servers" value="localhost:9092" />
                ...
                </map>
            </constructor-arg>
        </bean>
    </constructor-arg>
    <constructor-arg>
        <bean class="org.springframework.kafka.listener.config.ContainerProperties">
            <constructor-arg name="topics" value="foo" />
        </bean>
    </constructor-arg>

</bean>

@Bean
public IntegrationFlow flow(ConsumerFactory<String, String> cf)  {
    return IntegrationFlow.from(Kafka.inboundChannelAdapter(cf, new ConsumerProperties("myTopic")),
                          e -> e.poller(Pollers.fixedDelay(5000)))
            .handle(System.out::println)
            .get();
}

@Bean
fun sourceFlow(cf: ConsumerFactory<String, String>) =
    integrationFlow(Kafka.inboundChannelAdapter(cf,
        ConsumerProperties(TEST_TOPIC3).also {
            it.groupId = "kotlinMessageSourceGroup"
        }),
        { poller(Pollers.fixedDelay(100)) }) {
        handle { m ->

        }
    }

@InboundChannelAdapter(channel = "fromKafka", poller = @Poller(fixedDelay = "5000"))
@Bean
public KafkaMessageSource<String, String> source(ConsumerFactory<String, String> cf)  {
    ConsumerProperties consumerProperties = new ConsumerProperties("myTopic");
	consumerProperties.setGroupId("myGroupId");
	consumerProperties.setClientId("myClientId");
    retunr new KafkaMessageSource<>(cf, consumerProperties);
}

<int-kafka:inbound-channel-adapter
        id="adapter1"
        consumer-factory="consumerFactory"
        consumer-properties="consumerProperties1"
        ack-factory="ackFactory"
        channel="inbound"
        message-converter="converter"
        payload-type="java.lang.String"
        raw-header="true"
        auto-startup="false">
    <int:poller fixed-delay="5000"/>
</int-kafka:inbound-channel-adapter>

<bean id="consumerFactory" class="org.springframework.kafka.core.DefaultKafkaConsumerFactory">
    <constructor-arg>
        <map>
            <entry key="max.poll.records" value="1"/>
        </map>
    </constructor-arg>
</bean>

<bean id="consumerProperties1" class="org.springframework.kafka.listener.ConsumerProperties">
    <constructor-arg name="topics" value="topic1"/>
    <property name="groupId" value="group"/>
    <property name="clientId" value="client"/>
</bean>

@Bean
public IntegrationFlow outboundGateFlow(
        ReplyingKafkaTemplate<String, String, String> kafkaTemplate) {

    return IntegrationFlow.from("kafkaRequests")
            .handle(Kafka.outboundGateway(kafkaTemplate))
            .channel("kafkaReplies")
            .get();
}

@Bean
@ServiceActivator(inputChannel = "kafkaRequests", outputChannel = "kafkaReplies")
public KafkaProducerMessageHandler<String, String> outGateway(
        ReplyingKafkaTemplate<String, String, String> kafkaTemplate) {
    return new KafkaProducerMessageHandler<>(kafkaTemplate);
}

<int-kafka:outbound-gateway
    id="allProps"
    error-message-strategy="ems"
    kafka-template="template"
    message-key-expression="'key'"
    order="23"
    partition-id-expression="2"
    reply-channel="replies"
    reply-timeout="43"
    request-channel="requests"
    requires-reply="false"
    send-success-channel="successes"
    send-failure-channel="failures"
    send-timeout-expression="44"
    sync="true"
    timestamp-expression="T(System).currentTimeMillis()"
    topic-expression="'topic'"/>

@Bean
public IntegrationFlow serverGateway(
        ConcurrentMessageListenerContainer<Integer, String> container,
        KafkaTemplate<Integer, String> replyTemplate) {
    return IntegrationFlow
            .from(Kafka.inboundGateway(container, replyTemplate)
                .replyTimeout(30_000))
            .<String, String>transform(String::toUpperCase)
            .get();
}

@Bean
public KafkaInboundGateway<Integer, String, String> inboundGateway(
        AbstractMessageListenerContainer<Integer, String>container,
        KafkaTemplate<Integer, String> replyTemplate) {

    KafkaInboundGateway<Integer, String, String> gateway =
        new KafkaInboundGateway<>(container, replyTemplate);
    gateway.setRequestChannel(requests);
    gateway.setReplyChannel(replies);
    gateway.setReplyTimeout(30_000);
    return gateway;
}

<int-kafka:inbound-gateway
        id="gateway1"
        listener-container="container1"
        kafka-template="template"
        auto-startup="false"
        phase="100"
        request-timeout="5000"
        request-channel="nullChannel"
        reply-channel="errorChannel"
        reply-timeout="43"
        message-converter="messageConverter"
        payload-type="java.lang.String"
        error-message-strategy="ems"
        retry-template="retryTemplate"
        recovery-callback="recoveryCallback"/>

@Bean
public IntegrationFlow flowWithSubscribable(KafkaTemplate<Integer, String> template,
        ConcurrentKafkaListenerContainerFactory<Integer, String> containerFactory) {

    return IntegrationFlow.from(...)
            ...
            .channel(Kafka.channel(template, containerFactory, "someTopic1").groupId("group1"))
            ...
            .get();
}

@Bean
public IntegrationFlow flowWithPubSub(KafkaTemplate<Integer, String> template,
        ConcurrentKafkaListenerContainerFactory<Integer, String> containerFactory) {

    return IntegrationFlow.from(...)
            ...
            .publishSubscribeChannel(pubSub(template, containerFactory),
                pubsub -> pubsub
                            .subscribe(subflow -> ...)
                            .subscribe(subflow -> ...))
            .get();
}

@Bean
public BroadcastCapableChannel pubSub(KafkaTemplate<Integer, String> template,
        ConcurrentKafkaListenerContainerFactory<Integer, String> containerFactory) {

    return Kafka.publishSubscribeChannel(template, containerFactory, "someTopic2")
            .groupId("group2")
            .get();
}

@Bean
public IntegrationFlow flowWithPollable(KafkaTemplate<Integer, String> template,
        KafkaMessageSource<Integer, String> source) {

    return IntegrationFlow.from(...)
            ...
            .channel(Kafka.pollableChannel(template, source, "someTopic3").groupId("group3"))
            .handle(...,  e -> e.poller(...))
            ...
            .get();
}

/**
 * Channel for a single subscriber.
 **/
@Bean
SubscribableKafkaChannel pointToPoint(KafkaTemplate<String, String> template,
    KafkaListenerContainerFactory<String, String> factory)

    SubscribableKafkaChannel channel =
        new SubscribableKafkaChannel(template, factory, "topicA");
    channel.setGroupId("group1");
    return channel;
}

/**
 * Channel for multiple subscribers.
 **/
@Bean
SubscribableKafkaChannel pubsub(KafkaTemplate<String, String> template,
    KafkaListenerContainerFactory<String, String> factory)

    SubscribableKafkaChannel channel =
        new SubscribableKafkaChannel(template, factory, "topicB", true);
    channel.setGroupId("group2");
    return channel;
}

/**
 * Pollable channel (topic is configured on the source)
 **/
@Bean
PollableKafkaChannel pollable(KafkaTemplate<String, String> template,
    KafkaMessageSource<String, String> source)

    PollableKafkaChannel channel =
        new PollableKafkaChannel(template, source);
    channel.setGroupId("group3");
    return channel;
}

<int-kafka:channel kafka-template="template" id="ptp" topic="ptpTopic" group-id="ptpGroup"
    container-factory="containerFactory" />

<int-kafka:pollable-channel kafka-template="template" id="pollable" message-source="source"
    group-id = "pollableGroup"/>

<int-kafka:publish-subscribe-channel kafka-template="template" id="pubSub" topic="pubSubTopic"
    group-id="pubSubGroup" container-factory="containerFactory" />