spring amqp-outbound gateway 产生来自不同 thead 的回复（像 jms-outbound gateway）

Question

问题陈述：

Spring amqp-outbound gateway 从不同的线程产生回复（像 jms-outbound gateway，有不同的队列，使用关联键关联 request/response）。

无法将消息与此示例相关联。

Spring 整合

    <int:gateway id="outboundGateway" service-interface="com.amqp.outbound.gateway.OutboundGateway"     
                        default-reply-channel="defaultReplyChannel" >
        <int:method name="process"   request-channel="inboundRequestChannel"/>
    </int:gateway>

    <int:channel id="defaultReplyChannel"/>
    <int:channel id="inboundRequestChannel"/>
    <int:channel id="enrichedInboundRequestChannel"/>
    <int:channel id="processAuthRequestChannel"/>
    <int:channel id="postProcessorChannel"/>

    <int:chain input-channel="inboundRequestChannel" output-channel="enrichedInboundRequestChannel">
        <int:service-activator id="serviceActivator"
                       ref="ouboundService"  method="createRequest"/>
    </int:chain>

    <int-amqp:outbound-gateway id="outboundGtwyId" header-mapper="headerMapper"
                        request-channel="enrichedInboundRequestChannel"
                        reply-channel="defaultReplyChannel"
                        amqp-template="template" 
                        reply-timeout="30000" 
                        exchange-name="request_exchange" 
                        routing-key="request_exchange_queue"/>

    <int-amqp:inbound-channel-adapter id="amqpMessageDriven"  queue-names="request_queue" 
                                 connection-factory="rabbitConnectionFactory"  channel="processAuthRequestChannel"/>

    <int:service-activator id="serviceActivator"
                       ref="ouboundService" input-channel="processAuthRequestChannel" output-channel="postProcessorChannel"
                       method="processRequest"/>

    <int-amqp:outbound-channel-adapter amqp-template="template" channel="postProcessorChannel" 
            header-mapper="headerMapper" exchange-name="reply_exchange" routing-key="reply_exchange_queue"/>

    <bean id="headerMapper" class="org.springframework.integration.amqp.support.DefaultAmqpHeaderMapper"/>

配置

@Bean
public RabbitTemplate template(ConnectionFactory rabbitConnectionFactory){
    final RabbitTemplate template = new RabbitTemplate(rabbitConnectionFactory);
    template.setQueue("reply_queue");
    return template;
}



@Bean
public Binding binding(){
    return BindingBuilder.bind(this.queue()).to(this.exchange()).with("request_exchange_queue");
}

@Bean
public DirectExchange exchange(){
    return new DirectExchange("request_exchange");
}

@Bean
public Queue queue(){
    return new Queue("request_queue", true, false, true);
}

@Bean
public Binding bindingReply(){
    return BindingBuilder.bind(this.queue()).to(this.exchange()).with("reply_exchange_queue");
}

@Bean
public DirectExchange exchangeReply(){
    return new DirectExchange("reply_exchange");
}


@Bean
public Queue replyQueue(){
    return new Queue("reply_queue", true, false, true);
}

服务

@Service
public final class OuboundService {


    public Message createRequest(String message){
        System.out.println("Inside createRequest : "+ message);
        final String transactionId = UUID.randomUUID().toString();
        final Message builtMessage = MessageBuilder.withBody(message.getBytes())
                .setContentType(MessageProperties.CONTENT_TYPE_TEXT_PLAIN)
                .setHeader(AmqpHeaders.CORRELATION_ID, transactionId)
                .build();
        return builtMessage;
    }


    public Message processRequest(Message message){
        System.out.println("Inside process Request : "+ new String(message.getBody()));
        System.out.println("Header values : "+message.getMessageProperties().getHeaders());
        final Message result = MessageBuilder.withBody("Successful".getBytes()).copyProperties(message.getMessageProperties())
                                .copyHeaders(message.getMessageProperties().getHeaders()).build();
        return result;
    }

}

错误：

org.springframework.integration.handler.ReplyRequiredException: 处理程序 'outboundGtwyId' 未产生任何回复，其 'requiresReply' 属性设置为 true。

GitHub 源代码（解决方案）

https://github.com/kingkongprab/spring-amqp-outbound-gateway

Answer 1

关联也在 Spring AMQP 中完成。有关详细信息，请参阅其 RabbitTemplate#sendAndRecevie()。在 Reference Manual.

中也有关于此事的很好的文档

Spring 与其 AbstractAmqpOutboundEndpoint 和 AmqpInboundGateway 实现的集成提供了 out-of-the-box request-reply 相关解决方案。如果你不能在服务器端使用AmqpInboundGateway，你应该确保correlationId从接收到的请求传输到要发送回的回复。是的，您可以使用专用交换器进行回复，这就是 RabbitTemplate#setQueue() 支持的等待客户端出站回复的方式。但如果没有适当的 correlation 转移，那仍然行不通。有关 headers（包括 correlationId）如何映射到 Spring 集成的信息，另请参阅 https://docs.spring.io/spring-integration/docs/4.3.12.RELEASE/reference/html/amqp.html#amqp-message-headers。

更新

感谢您分享您的申请。

嗯，现在我看到几个问题：

您肯定缺少 replyQueue 绑定：

@Bean
public Binding bindingReply(){
    return BindingBuilder.bind(this.replyQueue()).to(this.exchangeReply()).with("reply_exchange_queue");
}

RabbitTemplate 必须使用 setReplyAddress()。您必须为 reply_queue 配置 MessageListenerContainer 并将 RabbitTemplate 作为侦听器：

@Bean
public RabbitTemplate template(ConnectionFactory rabbitConnectionFactory){
    final RabbitTemplate template = new RabbitTemplate(rabbitConnectionFactory);
    template.setReplyAddress(replyQueue().getName());
    return template;
}

@Bean
public MessageListenerContainer replyContainer(RabbitTemplate template) {
    SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
    container.setConnectionFactory(template.getConnectionFactory());
    container.setQueues(replyQueue());
    container.setMessageListener(template);
    return container;
}

你的 OuboundService 和 org.springframework.amqp.core.Message 操作是没用的。通道适配器不知道这种类型的 payload，您的自定义 Message 只是变成另一个 org.springframework.amqp.core.Message 的序列化 body。我已经将其更改为这个并且一切正常：
```
public String createRequest(String message){
    System.out.println("Inside createRequest : "+ message);
    return message;
}


public Message processRequest(Message message){
    System.out.println("Inside process Request : " + message);
    return message;
}
```

无论如何，我建议您重新考虑您的设计并返回 AmqpInboundGateway。

顺便说一句，在最终的解决方案中你不需要关心任何 correlation。框架会自动为您完成。

spring amqp-outbound gateway 产生来自不同 thead 的回复（像 jms-outbound gateway）

spring amqp-outbound gateway to produce reply from a different thead (Like jms-outbound gateway)

java

spring-integration

spring-amqp