Я только что проверил это, и он прекрасно работает для меня ...
@SpringBootApplication
public class So61152047Application {
public static void main(String[] args) {
SpringApplication.run(So61152047Application.class, args);
}
@Autowired
private KafkaTemplate<String, String> kafkaTemplate;
@Bean
public ReplyingKafkaTemplate<String, String, String> replyer(ProducerFactory<String, String> pf,
ConcurrentKafkaListenerContainerFactory<String, String> containerFactory) {
containerFactory.setReplyTemplate(kafkaTemplate(pf));
ConcurrentMessageListenerContainer<String, String> container = replyContainer(containerFactory);
ReplyingKafkaTemplate<String, String, String> replyer = new ReplyingKafkaTemplate<>(pf, container);
return replyer;
}
@Bean
public ConcurrentMessageListenerContainer<String, String> replyContainer(
ConcurrentKafkaListenerContainerFactory<String, String> containerFactory) {
ConcurrentMessageListenerContainer<String, String> container = containerFactory.createContainer("topic3");
container.getContainerProperties().setGroupId("three");
return container;
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate(ProducerFactory<String, String> pf) {
return new KafkaTemplate<>(pf);
}
@Bean
public ApplicationRunner runner(ReplyingKafkaTemplate<String, String, String> rkt) {
return args -> {
ProducerRecord<String, String> pr = new ProducerRecord<>("topic1", "foo", "bar");
RequestReplyFuture<String, String, String> future = rkt.sendAndReceive(pr);
System.out.println(future.get(10, TimeUnit.SECONDS).value());
};
}
@Bean
public NewTopic topic1() {
return TopicBuilder.name("topic1").partitions(1).replicas(1).build();
}
@Bean
public NewTopic topic2() {
return TopicBuilder.name("topic2").partitions(1).replicas(1).build();
}
@Bean
public NewTopic topic3() {
return TopicBuilder.name("topic3").partitions(1).replicas(1).build();
}
@KafkaListener(id = "one", topics = "topic1")
public void listen1(String in,
@Header(KafkaHeaders.CORRELATION_ID) byte[] corrId) {
System.out.println(in);
ProducerRecord<String, String> pr = new ProducerRecord<>("topic2", in.toUpperCase());
pr.headers().add(new RecordHeader(KafkaHeaders.CORRELATION_ID, corrId));
this.kafkaTemplate.send(pr);
}
@KafkaListener(id = "two", topics = "topic2")
@SendTo("topic3")
public String listen2(String in) {
return in + in;
}
}
и
bar
BARBAR
Вы также можете распространять заголовок (и) ответа на сообщение .. .
@KafkaListener(id = "one", topics = "topic1")
public void listen1(String in,
@Header(KafkaHeaders.REPLY_TOPIC) byte[] replyTo,
@Header(KafkaHeaders.CORRELATION_ID) byte[] corrId) {
System.out.println(in);
ProducerRecord<String, String> pr = new ProducerRecord<>("topic2", in.toUpperCase());
pr.headers().add(new RecordHeader(KafkaHeaders.REPLY_TOPIC, replyTo));
pr.headers().add(new RecordHeader(KafkaHeaders.CORRELATION_ID, corrId));
this.kafkaTemplate.send(pr);
}
@KafkaListener(id = "two", topics = "topic2")
@SendTo // ("topic3")
public String listen2(String in) {
return in + in;
}
РЕДАКТИРОВАТЬ
Для передачи идентификатора корреляции через полезную нагрузку:
public class CorrelatingProducerInterceptor implements ProducerInterceptor<String, Foo> {
@Override
public void configure(Map<String, ?> configs) {
}
@Override
public ProducerRecord<String, Foo> onSend(ProducerRecord<String, Foo> record) {
Header correlation = record.headers().lastHeader(KafkaHeaders.CORRELATION_ID);
if (correlation != null) {
record.value().setCorrelation(correlation.value());
}
return record;
}
@Override
public void onAcknowledgement(RecordMetadata metadata, Exception exception) {
}
@Override
public void close() {
}
}
@SpringBootApplication
public class So61152047Application {
public static void main(String[] args) {
SpringApplication.run(So61152047Application.class, args);
}
@Autowired
private KafkaTemplate<String, Foo> kafkaTemplate;
@Bean
public ReplyingKafkaTemplate<String, Foo, Foo> replyer(ProducerFactory<String, Foo> pf,
ConcurrentKafkaListenerContainerFactory<String, Foo> containerFactory) {
containerFactory.setReplyTemplate(kafkaTemplate(pf));
ConcurrentMessageListenerContainer<String, Foo> container = replyContainer(containerFactory);
ReplyingKafkaTemplate<String, Foo, Foo> replyer = new ReplyingKafkaTemplate<>(pf, container);
return replyer;
}
@Bean
public ConcurrentMessageListenerContainer<String, Foo> replyContainer(
ConcurrentKafkaListenerContainerFactory<String, Foo> containerFactory) {
ConcurrentMessageListenerContainer<String, Foo> container = containerFactory.createContainer("topic3");
container.getContainerProperties().setGroupId("three");
return container;
}
@Bean
public KafkaTemplate<String, Foo> kafkaTemplate(ProducerFactory<String, Foo> pf) {
return new KafkaTemplate<>(pf);
}
@Bean
public ApplicationRunner runner(ReplyingKafkaTemplate<String, Foo, Foo> rkt) {
return args -> {
ProducerRecord<String, Foo> pr = new ProducerRecord<>("topic1", "foo", new Foo("bar"));
RequestReplyFuture<String, Foo, Foo> future = rkt.sendAndReceive(pr);
System.out.println(future.get(10, TimeUnit.SECONDS).value());
};
}
@Bean
public NewTopic topic1() {
return TopicBuilder.name("topic1").partitions(1).replicas(1).build();
}
@Bean
public NewTopic topic2() {
return TopicBuilder.name("topic2").partitions(1).replicas(1).build();
}
@Bean
public NewTopic topic3() {
return TopicBuilder.name("topic3").partitions(1).replicas(1).build();
}
@KafkaListener(id = "one", topics = "topic1")
public void listen1(Foo in) {
System.out.println(in);
in.setContent(in.getContent().toUpperCase());
ProducerRecord<String, Foo> pr = new ProducerRecord<>("topic2", in);
this.kafkaTemplate.send(pr);
}
@KafkaListener(id = "two", topics = "topic2")
public void listen2(Foo in) {
ProducerRecord<String, Foo> pr = new ProducerRecord<>("topic3", new Foo(in.getContent() + in.getContent()));
pr.headers().add(new RecordHeader(KafkaHeaders.CORRELATION_ID, in.getCorrelation()));
this.kafkaTemplate.send(pr);
}
}
class Foo {
String content;
byte[] correlation;
public Foo() {
}
public Foo(String content) {
this.content = content;
}
public String getContent() {
return this.content;
}
public void setContent(String content) {
this.content = content;
}
public byte[] getCorrelation() {
return this.correlation;
}
public void setCorrelation(byte[] correlation) {
this.correlation = correlation;
}
@Override
public String toString() {
return "Foo [content=" + this.content + "]";
}
}
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.properties.spring.json.value.default.type=com.example.demo.Foo
spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
spring.kafka.producer.properties.interceptor.classes=com.example.demo.CorrelatingProducerInterceptor
и
Foo [content=bar]
Foo [content=BARBAR]
Конечно, промежуточное приложение должно передавать идентификатор корреляции, даже если он находится в полезной нагрузке.