Events 无法使用Spring Cloud Stream@StreamListener注释中的条件属性筛选收到的消息

我正在尝试创建一个基于事件的系统，用于使用ApacheKafka作为消息传递系统和SpringCloudStreamKafka在服务之间进行通信

我已经编写了如下的Receiver类方法

    @StreamListener(target = Sink.INPUT, condition = "headers['eventType']=='EmployeeCreatedEvent'")
    public void handleEmployeeCreatedEvent(@Payload String payload) {
        logger.info("Received EmployeeCreatedEvent: " + payload);
    }

@Component
@EnableBinding(Source.class)
public class CustomMessageSource {
    @Autowired
    private Source source;                


    public void  sendMessage(String payload,String eventType) {
        Message<String> myMessage = MessageBuilder.withPayload(payload)
                .setHeader("eventType", eventType)
                .build();
        source.output().send(myMessage);

     }

}

customMessageSource.sendMessage("Hello","EmployeeCreatedEvent");

@Autowired
CustomMessageSource customMessageSource;

此方法专门用于捕获与EmployeeCreatedEvent相关的消息或事件

    @StreamListener(target = Sink.INPUT, condition = "headers['eventType']=='EmployeeTransferredEvent'")
    public void handleEmployeeTransferredEvent(@Payload String payload) {
        logger.info("Received EmployeeTransferredEvent: " + payload);
    }

此方法专门用于捕获与EmployeeTransferredEvent相关的消息或事件

    @StreamListener(target = Sink.INPUT)
    public void handleDefaultEvent(@Payload String payload) {
        logger.info("Received payload: " + payload);
    }

这是默认方法

当我运行应用程序时，我无法看到被调用的带有条件属性的方法。我只看到调用handleDefaultEvent方法

我正在使用下面的CustomMessageSource类从发送/源应用程序向此接收器应用程序发送消息，如下所示

    @StreamListener(target = Sink.INPUT, condition = "headers['eventType']=='EmployeeCreatedEvent'")
    public void handleEmployeeCreatedEvent(@Payload String payload) {
        logger.info("Received EmployeeCreatedEvent: " + payload);
    }

@Component
@EnableBinding(Source.class)
public class CustomMessageSource {
    @Autowired
    private Source source;                


    public void  sendMessage(String payload,String eventType) {
        Message<String> myMessage = MessageBuilder.withPayload(payload)
                .setHeader("eventType", eventType)
                .build();
        source.output().send(myMessage);

     }

}

customMessageSource.sendMessage("Hello","EmployeeCreatedEvent");

@Autowired
CustomMessageSource customMessageSource;

customMessageSource实例自动连接如下：

    @StreamListener(target = Sink.INPUT, condition = "headers['eventType']=='EmployeeCreatedEvent'")
    public void handleEmployeeCreatedEvent(@Payload String payload) {
        logger.info("Received EmployeeCreatedEvent: " + payload);
    }

@Component
@EnableBinding(Source.class)
public class CustomMessageSource {
    @Autowired
    private Source source;                


    public void  sendMessage(String payload,String eventType) {
        Message<String> myMessage = MessageBuilder.withPayload(payload)
                .setHeader("eventType", eventType)
                .build();
        source.output().send(myMessage);

     }

}

customMessageSource.sendMessage("Hello","EmployeeCreatedEvent");

@Autowired
CustomMessageSource customMessageSource;

基本上，我想过滤接收器/接收器应用程序接收到的消息，并相应地处理它们

为此，我使用带有条件属性的@StreamListener注释来模拟处理不同事件的行为

我正在使用SpringCloudStreamChelsea.SR2版本

---

有人能帮我解决这个问题吗。

似乎没有传播标题。确保在spring.cloud.stream.kafka.binder.headers中包含自定义标题

谢谢你的回复。但是，我没有得到你的回应。我使用有效负载和作为输入接收的头显式构造消息。我不确定为什么我应该在配置文件中包含自定义头。Spring cloud stream默认情况下不会传播自定义头。此设置将告诉生产者应用程序我们应该这样做；我们必须将它们嵌入到数据中；因此，选择加入的方法，以避免添加不必要的数据。谢谢，这是有意义的。