RocketMQ 自定义 Binding

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概述

在实际生产中，我们需要发布和订阅的消息可能不止一种 Topic ，故此时就需要使用自定义 Binding 来帮我们实现多 Topic 的发布和订阅功能

生产者

自定义 Output 接口，代码如下：

public interface MySource {
    @Output("output1")
    MessageChannel output1();

    @Output("output2")
    MessageChannel output2();
}

发布消息的案例代码如下：

@Autowired
private MySource source;

public void send(String msg) throws Exception {
    source.output1().send(MessageBuilder.withPayload(msg).build());
}

消费者

自定义 Input 接口，代码如下：

public interface MySink {
    @Input("input1")
    SubscribableChannel input1();

    @Input("input2")
    SubscribableChannel input2();

    @Input("input3")
    SubscribableChannel input3();

    @Input("input4")
    SubscribableChannel input4();
}

接收消息的案例代码如下：

@StreamListener("input1")
public void receiveInput1(String receiveMsg) {
    System.out.println("input1 receive: " + receiveMsg);
}

Application

配置 Input 和 Output 的 Binding 信息并配合 @EnableBinding 注解使其生效，代码如下：

@SpringBootApplication
@EnableBinding({ MySource.class, MySink.class })
public class RocketMQApplication {
    public static void main(String[] args) {
        SpringApplication.run(RocketMQApplication.class, args);
    }
}

application.yml

生产者

spring:
  application:
    name: rocketmq-provider
  cloud:
    stream:
      rocketmq:
        binder:
          namesrv-addr: 192.168.10.149:9876
      bindings:
        output1: {destination: test-topic1, content-type: application/json}
        output2: {destination: test-topic2, content-type: application/json}

消费者

spring:
  application:
    name: rocketmq-consumer
  cloud:
    stream:
      rocketmq:
        binder:
          namesrv-addr: 192.168.10.149:9876
        bindings:
          input: {consumer.orderly: true}
      bindings:
        input1: {destination: test-topic1, content-type: text/plain, group: test-group, consumer.maxAttempts: 1}
        input2: {destination: test-topic1, content-type: text/plain, group: test-group, consumer.maxAttempts: 1}
        input3: {destination: test-topic2, content-type: text/plain, group: test-group, consumer.maxAttempts: 1}
        input4: {destination: test-topic2, content-type: text/plain, group: test-group, consumer.maxAttempts: 1}