RabbitMQ Spring 雲 stream 僅在提交數據庫事務時發布消息

Question

我有這個用例，其中只有在事務提交到數據庫時才必須發布消息，現在偵聽器在事務提交到數據庫之前選擇消息，這將導致偵聽器端出現異常.. .我正在重試使用DLQ在偵聽器處處理消息，但我想首先避免這個問題，因為我在多個地方都有這個問題，並且所有日志都被重試嘗試污染了。

I have followed the approach documented here but somehow am not able to make it work Transaction in Spring cloud Stream , here RabbitTransactionManager bean is getting created but it's not referred anywhere, not sure how's the wiring happening with rest of the stuff,

這是我嘗試過的代碼，有人可以告訴我我在哪里出錯了嗎？

@Component
@Slf4j
@NoArgsConstructor
public class MQSender {

    public boolean send(MessageChannel messageChannel, AbstractMqMsg abstractMqMsg) {
        return messageChannel.send(MessageBuilder.withPayload(abstractMqMsg).build());
    }
}


public interface MetadataMQChannels {
    @Output(QueueConstants.VALIDATE_METADATA_CHANNEL)
    MessageChannel validateMetadataPublishChannel();
}

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class QueueConstants {
    public static final String VALIDATE_METADATA_CHANNEL = "validateMetadataPublishChannel";
}

#application-properties 
spring.cloud.stream.rabbit.bindings.validateMetadataPublishChannel.producer.transacted=true
spring.cloud.stream.rabbit.bindings.validateMetadataPublishChannel.producer.routingKeyExpression='validatemetadata'
spring.cloud.stream.bindings.validateMetadataErrorPublishChannel.destination=metadata-error-exchange
spring.cloud.stream.bindings.validateMetadataErrorPublishChannel.producer.requiredGroups=validate-metadata-error-queue
spring.cloud.stream.rabbit.bindings.validateMetadataErrorPublishChannel.producer.exchangeType=direct

@Service
@Slf4j
class ValidatePackage{

    @Autowired
    private MQSender mqSender;
    
    @Autowired
    private MetadataMQChannels metadataMQChannels;
    
    @Autowired
    private MetadataService metadataService;
    
    //Publishing the message in the context of transaction 
    @Transactional(rollbackFor = Exception.class)
    public MetaDataDto create(MetaDataDto metadata) throws BaseException {
        
        metadataService.saveMetadata(); //persist dto to the Database
        mqSender.send(metadataMQChannels.validateMetadataChannel(), metadata); //publish the message 
    }
}


@SpringBootApplication
@Slf4j
@EnableBinding(value = {MetadataMQChannels.class})
@EnableAsync
@EnableTransactionManagement
public class ManagerApplication {

    public static void main(String[] args) {

        SpringApplication.run(ManagerApplication.class);
        log.info("Manager Application has been started successfully");
    }
    
    @Bean
    public RabbitTransactionManager transactionManager(ConnectionFactory cf) {
        return new RabbitTransactionManager(cf);
    }
}

Answer 1

您需要設置transacted的兔子生產者綁定屬性，以便其RabbitTemplate將參與交易

https://docs.spring.io/spring-cloud-stream-binder-rabbit/docs/3.0.10.RELEASE/reference/html/spring-cloud-stream-binder-rabbit.html#rabbit-prod-props

成交

是否使用交易渠道。

默認值：假。

您似乎已將其設置為 true，因此必須進行其他操作。 我建議在RabbitTemplate.execute中設置一個斷點，看看發生了什么。