Question

我使用Spring Cloud场景为生产者-处理器-消费者场景创建了一个示例应用程序。在这里，我使用了基于传统注释的方法。

在单元测试中，我想测试一种简单的方案，即在转换后生成一条消息并声明消耗的消息。但是我没有在消费者绑定端收到消息。请让我知道这里可能缺少什么。

Producer.java

library(dplyr)
cols <- c('i', 'j', 'k')

dat %>%
  group_by(Categories) %>%
  summarise(across(starts_with('Item_'), max)) %>%
  #In old dplyr
  #summarise_at(vars(starts_with('Item_')), max)
  mutate(FactorCol = purrr::pmap_chr(select(., starts_with('Item_')), 
                          ~toString(cols[c(...) == 1]))) %>%
  select(Categories, FactorCol) %>%
  left_join(dat, by = 'Categories')


#  Categories FactorCol Items Item_i Item_j Item_k
#  <chr>      <chr>     <chr>  <dbl>  <dbl>  <dbl>
#1 A          i, j      x          1      0      0
#2 A          i, j      y          0      1      0
#3 B          i, j, k   y          0      1      0
#4 B          i, j, k   z          1      0      1
#5 C          i, k      x          1      0      0
#6 C          i, k      z          0      0      1
#7 D          j, k      y          0      1      0
#8 D          j, k      z          0      0      1

TransformProcessor.java

@EnableBinding(MyProcessor.class)
public class Producer {

    @Bean
    @InboundChannelAdapter(value = MyProcessor.OUTPUT, poller = @Poller(fixedDelay = "1000", maxMessagesPerPoll = "1"))
    public MessageSource<String> produceMessage() {
        return () -> new GenericMessage<>("Hello Spring Cloud World >>> " + Instant.now());
    }
}

Consumer.java

@EnableBinding(MyProcessor.class)
public class TransformProcessor {

    @Transformer(inputChannel = MyProcessor.OUTPUT, outputChannel = MyProcessor.INPUT)
    public String transform(String message) {
        System.out.println("Transforming the message: " + message);
        return message.toUpperCase();
    }
}

MyProcessor.java

@EnableBinding(MyProcessor.class)
public class Consumer {

    @StreamListener(MyProcessor.INPUT)
    public void consume(String message) {
        System.out.println("Consuming transformed message: " + message);
    }
}

SpringCloudStreamLegacyApplicationTests.java

public interface MyProcessor {
    String INPUT = "my-input";
    final static String OUTPUT = "my-output";

    @Input(INPUT)
    SubscribableChannel anInput();

    @Output(OUTPUT)
    MessageChannel anOutput();
}

在这里，我希望在 handleMessage 方法中收到一条消息。

注意，我正在使用以下依赖项进行测试：

@SpringBootTest
class SpringCloudStreamLegacyApplicationTests {

    @Autowired
    private MyProcessor myProcessor;

    @Autowired
    private MessageCollector messageCollector;

    @Test
    public void testConsumer() {

        myProcessor.anOutput().send(new GenericMessage<byte[]>("hello".getBytes()));

        Message<?> poll = messageCollector.forChannel(myProcessor.anInput()).poll();
        System.out.println("Received: " + poll.getPayload());
    }

}

单元测试Spring Cloud Stream生产者-处理器-消费者方案

0 个答案: