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我们目前正在将我们当前的架构迁移到基于 Spring-AWS 的微服务中。我的任务之一是研究我们的微服务如何相互通信。我的目标是建立一个 RESTful HTTP 端点和 SQS 生产者和消费者的混合系统。

例如，我有以下代码：

@SqsListener("request_queue")
@SendTo("response_queue")
@PostMapping("/send")
public Object send(@RequestBody Request request, @Header("SenderId") String senderId) {
    if (senderId != null && !senderId.trim().isEmpty()) {
        logger.info("SQS Message Received!");
        logger.info("Sender ID: ".concat(senderId));
        request = new Gson().fromJson(payload, Request.class);
    }

    Response response = processRequest(request); // Process request

    return response;
}

从理论上讲，该方法应该能够处理以下问题：

  1. 通过 HTTP接收请求对象
  2. 不断轮询request_queue以获取包含Request对象的消息

作为 HTTP 端点，该方法不返回错误。但是，作为 SQS 监听器，它会遇到以下异常：

org.springframework.messaging.converter.MessageConversionException: 
    Cannot convert from [java.lang.String] to [com.oriente.salt.Request] for 
    GenericMessage [payload={"source":"QueueTester","message":"This is a wonderful 
    message send by queue from Habanero to Salt. Spicy.","msisdn":"+639772108550"}, 
    headers={LogicalResourceId=salt_queue, ApproximateReceiveCount=1, 
    SentTimestamp=1523444620218, ....

我尝试使用@Payload 注释请求参数，但无济于事。目前我还通过 Java 设置了 AWS 配置，如下所示：

消费者AWSSQSConfig.java

@Configuration
public class ConsumerAWSSQSConfig {

@Bean
public SimpleMessageListenerContainer simpleMessageListenerContainer() {
    SimpleMessageListenerContainer msgListenerContainer = simpleMessageListenerContainerFactory()
            .createSimpleMessageListenerContainer();
    msgListenerContainer.setMessageHandler(queueMessageHandler());
    return msgListenerContainer;
}

@Bean
public SimpleMessageListenerContainerFactory simpleMessageListenerContainerFactory() {
    SimpleMessageListenerContainerFactory msgListenerContainerFactory = new SimpleMessageListenerContainerFactory();
    msgListenerContainerFactory.setAmazonSqs(amazonSQSClient());
    return msgListenerContainerFactory;
}

@Bean
public QueueMessageHandler queueMessageHandler() {
    QueueMessageHandlerFactory queueMsgHandlerFactory = new QueueMessageHandlerFactory();
    queueMsgHandlerFactory.setAmazonSqs(amazonSQSClient());
    QueueMessageHandler queueMessageHandler = queueMsgHandlerFactory.createQueueMessageHandler();
    List<HandlerMethodArgumentResolver> list = new ArrayList<>();
    HandlerMethodArgumentResolver resolver = new PayloadArgumentResolver(new MappingJackson2MessageConverter());
    list.add(resolver);
    queueMessageHandler.setArgumentResolvers(list);
    return queueMessageHandler;
}

@Lazy
@Bean(name = "amazonSQS", destroyMethod = "shutdown")
public AmazonSQSAsync amazonSQSClient() {
    AmazonSQSAsync awsSQSAsync = AmazonSQSAsyncClientBuilder.standard().withRegion(Regions.AP_SOUTHEAST_1).build();
    return awsSQSAsync;
}
}

你们有什么感想？

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