學(xué)習(xí)完整課程請移步 互聯(lián)網(wǎng) Java 全棧工程師

概述

在實際生產(chǎn)中翔脱，我們需要發(fā)布和訂閱的消息可能不止一種 Topic 熔掺，故此時就需要使用自定義 Binding 來幫我們實現(xiàn)多 Topic 的發(fā)布和訂閱功能

生產(chǎn)者

自定義 Output 接口岩灭，代碼如下：

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

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

發(fā)布消息的案例代碼如下：

@Autowired
private MySource source;

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

消費(fèi)者

自定義 Input 接口涤姊，代碼如下：

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

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

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

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

接收消息的案例代碼如下：

@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 注解使其生效籽懦，代碼如下：

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

application.yml

生產(chǎn)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}

消費(fèi)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}