我正在使用具有以下配置的spring-kafka
:
package com.danigu.fancypants.infrastructure;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Data;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.converter.StringJsonMessageConverter;
import org.springframework.retry.RetryPolicy;
import org.springframework.retry.backoff.BackOffPolicy;
import org.springframework.retry.backoff.ExponentialBackOffPolicy;
import org.springframework.retry.policy.SimpleRetryPolicy;
import org.springframework.retry.support.RetryTemplate;
import javax.inject.Inject;
import java.util.HashMap;
import java.util.Map;
/**
* @author dani
*/
@Data
@EnableKafka
@Configuration
@Import({KafkaConfigurationProperties.class})
public class KafkaConfiguration {
@Inject KafkaConfigurationProperties kcp;
protected Map<String, Object> consumerProperties() {
Map<String, Object> props = new HashMap();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kcp.getBrokerAddress());
props.put(ConsumerConfig.GROUP_ID_CONFIG, kcp.getGroupId());
props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 15000);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
return props;
}
public ConsumerFactory<String, String> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerProperties());
}
@Bean
public StringJsonMessageConverter stringJsonMessageConverter(ObjectMapper mapper) {
return new StringJsonMessageConverter(mapper);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(
StringJsonMessageConverter messageConverter) {
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory();
factory.setMessageConverter(messageConverter);
factory.setConsumerFactory(consumerFactory());
factory.setConcurrency(1);
factory.setRetryTemplate(retryTemplate());
return factory;
}
/*
* Retry template.
*/
protected RetryPolicy retryPolicy() {
SimpleRetryPolicy policy = new SimpleRetryPolicy();
policy.setMaxAttempts(3);
return policy;
}
protected BackOffPolicy backOffPolicy() {
ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
policy.setInitialInterval(1000);
return policy;
}
protected RetryTemplate retryTemplate() {
RetryTemplate template = new RetryTemplate();
template.setRetryPolicy(retryPolicy());
template.setBackOffPolicy(backOffPolicy());
return template;
}
}
我的听众看起来像这样:
package com.danigu.fancypants.integration.inbound.dress;
import com.danigu.fancypants.integration.inbound.InvalidRequestException;
import com.danigu.fancypants.integration.inbound.dress.payload.DressRequest;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.listener.AcknowledgingMessageListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;
import javax.inject.Inject;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import java.util.Set;
/**
* @author dani
*/
@Component
public class DressListener {
@Inject protected Validator validator;
@KafkaListener(topics = {"${kafka.dressesTopic}"})
public void onMessage(@Payload DressRequest request, Acknowledgment acknowledgment) {
assertValidRequest(request);
System.out.println(request);
acknowledgment.acknowledge();
}
protected void assertValidRequest(DressRequest request) {
final Set<ConstraintViolation<DressRequest>> violations = validator.validate(request);
if(!violations.isEmpty()) {
throw new InvalidRequestException(violations, request);
}
}
}
到目前为止,我一直在查看
spring-kafka
的测试和参考文档,there,这些文档说应该配置适当类型的ErrorHandler
,这个test表示我应该在ContainerProperties
上进行配置,尽管那只是一个错误处理程序,在我的用例中,我想定义多个(针对不同的有效负载类型),如果可以的话,这可能吗?另外,有没有办法描述在带注释的侦听器void上使用哪个错误处理程序?
另外,是否有一种方法可以针对每个
RecoveryCallback
或可能针对每个不同的主题来描述@KafkaListener
,或者为此必须具有不同的ListenerContainerFactory
?我可能会完全错了,有人可以向我指出正确的方向,我如何以正确的方式为不同的有效负载类型配置多个
ErrorHandler
? 最佳答案
我不确定您所说的“不同的有效负载类型”是什么意思,因为您只有一个@KafkaListener
。对于不同的有效负载类型,类级别的@KafkaListener
可以在方法级别具有@KafkaHandler
。
无论如何,每个容器只有一个错误处理程序,因此您需要为每个错误处理程序使用不同的容器工厂(恢复回调也是如此)。
我们最近在errorHandler
中的@RabbitListener
上添加了spring-amqp
...
/**
* Set an {@link RabbitListenerErrorHandler} to invoke if the listener method throws
* an exception.
* @return the error handler.
* @since 2.0
*/
String errorHandler() default "";
...因此每个方法都可以在其中拥有自己的错误处理程序。
我们可能会在下一个spring-kafka版本中做类似的事情。但是对于每个
@KafkaListener
来说仍然只能是一个,因此对于类级别的@KafkaListener
不会有帮助。