Spring Cloud Stream @SendTo注释不起作用 [英] Spring Cloud Stream @SendTo Annotation not working

问题描述

我正在将Spring Cloud Stream与Spring Boot结合使用.我的申请非常简单:

ExampleService.class:

@EnableBinding(Processor1.class)
@Service
public class ExampleService {

    @StreamListener(Processor1.INPUT)
    @SendTo(Processor1.OUTPUT)
    public String dequeue(String message){
        System.out.println("New message: " + message);
        return message;
    }

    @SendTo(Processor1.OUTPUT)
    public String queue(String message){
        return message;
    }
}

Procesor1.class:

public interface Processor1 {

    String INPUT = "input1";
    String OUTPUT = "output1";

    @Input(Processor1.INPUT)
    SubscribableChannel input1();

    @Output(Processor1.OUTPUT)
    MessageChannel output1();
}

application.properties:

spring.cloud.stream.bindings.input1.destination=test_input
spring.cloud.stream.bindings.input1.group=test_group
spring.cloud.stream.bindings.input1.binder=binder1

spring.cloud.stream.bindings.output1.destination=test_output
spring.cloud.stream.bindings.output1.binder=binder1

spring.cloud.stream.binders.binder1.type=rabbit

spring.cloud.stream.binders.binder1.environment.spring.rabbitmq.host = localhost

场景:

1)当我在"test_input.test_group"队列中推送消息时，消息被正确打印并正确发送到"test_output"交换.所以ExampleService :: dequeue效果很好.

2)当我调用ExampleService :: queue方法(从类外部，在测试中)时，消息永远不会发送到'test_output'交换.

我正在使用Spring Boot 2.0.6.RELEASE和Spring Cloud Stream 2.0.2.RELEASE.

有人知道为什么情况2)无法正常工作吗?预先感谢.

解决方案

是什么让您相信@SendTo本身受支持? @SendTo是许多项目使用的辅助注释，而不仅仅是Spring Cloud Stream；据我所知，没有什么可以自己寻找的.

改为尝试Spring Integration的@Publisher注释(使用@EnablePublisher).

编辑

要强制使用CGLIB而不是JDK代理进行代理，您可以执行此操作...

@Bean
public static BeanFactoryPostProcessor bfpp() {
    return bf -> {
        bf.getBean(IntegrationContextUtils.PUBLISHER_ANNOTATION_POSTPROCESSOR_NAME,
                PublisherAnnotationBeanPostProcessor.class).setProxyTargetClass(true);
    };
}

I'm using Spring Cloud Stream with Spring Boot. My application is very simple:

ExampleService.class:

@EnableBinding(Processor1.class)
@Service
public class ExampleService {

    @StreamListener(Processor1.INPUT)
    @SendTo(Processor1.OUTPUT)
    public String dequeue(String message){
        System.out.println("New message: " + message);
        return message;
    }

    @SendTo(Processor1.OUTPUT)
    public String queue(String message){
        return message;
    }
}

Procesor1.class:

public interface Processor1 {

    String INPUT = "input1";
    String OUTPUT = "output1";

    @Input(Processor1.INPUT)
    SubscribableChannel input1();

    @Output(Processor1.OUTPUT)
    MessageChannel output1();
}

application.properties:

spring.cloud.stream.bindings.input1.destination=test_input
spring.cloud.stream.bindings.input1.group=test_group
spring.cloud.stream.bindings.input1.binder=binder1

spring.cloud.stream.bindings.output1.destination=test_output
spring.cloud.stream.bindings.output1.binder=binder1

spring.cloud.stream.binders.binder1.type=rabbit

spring.cloud.stream.binders.binder1.environment.spring.rabbitmq.host=localhost

Scenarios:

1) When I push a message in 'test_input.test_group' queue, message is correctly printed and correctly sent to 'test_output' exchange. So ExampleService::dequeue works well.

2) When I invoke ExampleService::queue method (from outside the class, in a test), message is never sent to 'test_output' exchange.

I'm working with Spring Boot 2.0.6.RELEASE and Spring Cloud Stream 2.0.2.RELEASE.

Anybody knows why scenario 2) is not working? Thanks in advance.

解决方案

What leads you to believe that @SendTo on its own is supported? @SendTo is a secondary annotation used by many projects, not just Spring Cloud Stream; as far as I know, there is nothing that will look for it on its own.

Try Spring Integration's @Publisher annotation instead (with @EnablePublisher).

EDIT

To force proxying with CGLIB instead of a JDK proxy, you can do this...

@Bean
public static BeanFactoryPostProcessor bfpp() {
    return bf -> {
        bf.getBean(IntegrationContextUtils.PUBLISHER_ANNOTATION_POSTPROCESSOR_NAME,
                PublisherAnnotationBeanPostProcessor.class).setProxyTargetClass(true);
    };
}

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