apache-kafka - 同步 Kafka 中的中间主题:使用 Spring Request-Reply
问题描述
在最新版本的 spring-kakfa 中,我们正在尝试使用请求-回复语义,并想知道我们是否可以在不丢失相关 ID 的情况下使用中间主题。我们的一个用例是从 api 接收消息,将其生成到 topic1,并将结果发送到 topic2,并在 topic2 上处理消息并将其发送到 topic3,topic3 将最终响应发送到来自 topic1 的初始请求。
我无法将来自 topic3 的响应与 topic1 上的请求相关联,因为相关 ID 在中间主题中丢失。如果我不使用中间主题(比如 topic2),我能够接收到消息,然后 topic1 发送一条带有相关 ID 的消息,并从 topic3 接收其相应的响应。
任何建议/建议都非常有帮助。
下面是示例代码:从我的 API 我发布交易
public String postTransaction(String request,Map<String, String> headers) throws InterruptedException, ExecutionException {
ProducerRecord<String,String> record=new ProducerRecord<String,String>(topic1,"300",request);
record.headers().add(new RecordHeader(KafkaHeaders.REPLY_TOPIC,topic3.getBytes()));
RequestReplyFuture<String,String,String> sendAndReceive=kafkaTemplate.sendAndReceive(record);
SendResult<String,String> requestMessage=sendAndReceive.getSendFuture().get();
return sendAndReceive.get().value();
}
#
在另一个消费者中,我正在收听 topic1 并获取相关 ID 并在 topic2 上生成消息,该消息将向 topic3 发送回复。
public void listen(Object request, @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) List<Integer> keys,
@Header(KafkaHeaders.RECEIVED_PARTITION_ID) List<Integer> partitions,
@Header(KafkaHeaders.RECEIVED_TOPIC) List<String> topics,
@Header(KafkaHeaders.OFFSET) List<Long> offsets,
@Header(KafkaHeaders.CORRELATION_ID) byte[] coRlId) throws InterruptedException {
ProducerRecord<String,String> record=new ProducerRecord<String,String>("topic2","300",k.value());
record.headers().add(new RecordHeader(KafkaHeaders.CORRELATION_ID,coRlId.get(0).getBytes()));
kafkaTemplate.send(record);
}
解决方案
我刚刚测试了它,它对我来说很好用......
@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;
}
}
和
bar
BARBAR
您还可以传播回复标头...
@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;
}
编辑
要通过有效负载传达相关 ID:
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
和
Foo [content=bar]
Foo [content=BARBAR]
当然,中间应用程序需要传递关联 id,即使它在有效负载中。
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