RocketMQ 自定义 Binding

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