使用 rocketmq5 是比较简单的事情。也有些同学对 sdk 原始接口会陌生，会希望有个集成的示例.

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client-java</artifactId>
    <version>${rocketmq5.version}</version>
</dependency>

完整的集成代码参考:

https://gitee.com/opensolon/solon-examples/tree/main/b.Integration/demoB002-rocketmq5 。

希望更加简化使用的同学，可以使用:

rocketmq5-solon-cloud-plugin （但定制性会变差） 。

1、看看配置怎么搞？

使用 Solon 初始器 生成一个 Solon Web 模板项目，然后添加上面的 rocketmq5 依赖.

• 添加 yml 配置（具体的配置属性，参考：ClientConfigurationBuilder，ProducerBuilder， PushConsumerBuilder）

solon.app:
  name: "demo-app"
  group: "demo"

solon.logging:
  logger:
    root:
      level: INFO

# 配置可以自由定义，与 @Bean 代码对应起来即可（以下为参考）
solon.rocketmq:
  properties:  #公共配置（配置项，参考：ClientConfigurationBuilder）
    endpoints: "127.0.0.1:8081"
    sessionCredentialsProvider:
      "@type": "demoB002.SessionCredentialsProviderImpl" # solon 支持 "@type" 类型申明当前配置节的实例类型
      accessKey: "xxx"
      accessSecret: "xxx"
      securityToken: "xxx"
    requestTimeout: "10s"
  producer: #生产者专属配置（配置项，参考：ProducerBuilder）
    maxAttempts: 3
  consumer: #消费者专属配置（配置项，参考：PushConsumerBuilder）
    consumerGroup: "${solon.app.group}_${solon.app.name}"
    consumptionThreadCount: 2
    maxCacheMessageCount: 1
    maxCacheMessageSizeInBytes: 1

• 添加 java 配置器

@Configuration
public class RocketmqConfig {
    private ClientServiceProvider clientProvider = ClientServiceProvider.loadService();
    
    @Bean
    public ClientConfiguration client(@Inject("${solon.rocketmq.properties}") Properties common){
        ClientConfigurationBuilder builder = ClientConfiguration.newBuilder();
        //注入属性
        Utils.injectProperties(builder, common);

        return builder.build();
    }

    @Bean
    public Producer producer(@Inject("${solon.rocketmq.producer}") Properties producer,
                             ClientConfiguration clientConfiguration) throws ClientException {
        ProducerBuilder producerBuilder = clientProvider.newProducerBuilder();

        //注入属性
        if (producer.size() > 0) {
            Utils.injectProperties(producerBuilder, producer);
        }

        producerBuilder.setClientConfiguration(clientConfiguration);

        return producerBuilder.build();
    }

    @Bean
    public PushConsumer consumer(@Inject("${solon.rocketmq.consumer}") Properties consumer,
                                 ClientConfiguration clientConfiguration,
                                 MessageListener messageListener) throws ClientException{

        //按需选择 PushConsumerBuilder 或 SimpleConsumerBuilder
        PushConsumerBuilder consumerBuilder = clientProvider.newPushConsumerBuilder();

        //注入属性
        Utils.injectProperties(consumerBuilder, consumer);

        Map<String, FilterExpression> subscriptionExpressions = new HashMap<>();
        subscriptionExpressions.put("topic.test",  new FilterExpression("*"));

        consumerBuilder.setSubscriptionExpressions(subscriptionExpressions);
        consumerBuilder.setClientConfiguration(clientConfiguration);
        consumerBuilder.setMessageListener(messageListener);

        return consumerBuilder.build();
    }
}

//这个实现类，（相对于 StaticSessionCredentialsProvider）方便配置自动注入
public class SessionCredentialsProviderImpl implements SessionCredentialsProvider {
    private String accessKey;
    private String accessSecret;
    private String securityToken;

    private SessionCredentials sessionCredentials;

    @Override
    public SessionCredentials getSessionCredentials() {
        if (sessionCredentials == null) {
            if (securityToken == null) {
                sessionCredentials = new SessionCredentials(accessKey, accessSecret);
            } else {
                sessionCredentials = new SessionCredentials(accessKey, accessSecret, securityToken);
            }
        }

        return sessionCredentials;
    }
}

2、代码应用

• 发送（或生产），这里代控制器由用户请求再发送消息（仅供参考）：

@Controller
public class DemoController {
    @Inject
    private Producer producer;

    @Mapping("/send")
    public void send(String msg) throws ClientException {
        //发送
        producer.send(new MessageBuilderImpl()
                .setTopic("topic.test")
                .setBody(msg.getBytes())
                .build());
    }
}

• 监听（或消费），这里采用订阅回调的方式：（仅供参考）

@Component
public class DemoMessageListener implements MessageListener {

    @Override
    public ConsumeResult consume(MessageView messageView) {
        System.out.println(messageView);

        return ConsumeResult.SUCCESS;
    }
}

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