Redisson中怎么实现一个延时消息组件

Redisson中怎么实现一个延时消息组件，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

定义主题队列注解

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface RMessage {

     /**
      * 消息队列
      * @return
      */
     String queue();

     /**
      * 主题
      * @return
      */
     String topic() default "system";

}

springboot启动监听初始化任务队列与消息主题，消费者订阅主题

@Slf4j
@Component
public class RMessageListener implements ApplicationListener<ApplicationStartedEvent> {

    /**
     * consumer monitoringMethod monitorMessage
     */
    private final static String METHOD_MONITOR_MESSAGE = "monitorMessage";

    /**
     * redisson topic name
     */
    private final static String ATTRIBUTE_NAME_TOPIC = "topic";

    /**
     * redisson messageQueue name
     */
    private final static String ATTRIBUTE_NAME_QUEUE = "queue";

    /**
     * redisson queue map
     */
    public static Map<String, RBlockingDeque<? super Serializable>> messageQueue = new ConcurrentHashMap<>();

    /**
     * redisson offQueue map
     */
    public static Map<String, RDelayedQueue<? super Serializable>> offQueue = new ConcurrentHashMap<>();

    /**
     * redisson topic map
     */
    public static Map<String, RTopic> topicMap = new ConcurrentHashMap<>();

    @Override
    public void onApplicationEvent(ApplicationStartedEvent applicationStartedEvent) {
        ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
        provider.addIncludeFilter(new AnnotationTypeFilter(RMessage.class));
        String basePackage = applicationStartedEvent.getSpringApplication().getMainApplicationClass().getPackage().getName();

        Set<BeanDefinition> beanDefinitions = provider.findCandidateComponents(basePackage);

        ConfigurableListableBeanFactory beanFactory = applicationStartedEvent.getApplicationContext().getBeanFactory();

        mqInit(beanDefinitions, beanFactory);

        provider.clearCache();
        provider.resetFilters(false);

        provider.addIncludeFilter(new AssignableTypeFilter(RMessageConsumer.class));

        Set<BeanDefinition> consumers = provider.findCandidateComponents(basePackage);

        consumerSubscribe(beanFactory, consumers);
    }

    /**
     * consumer subscription news
     *
     * @param beanFactory
     * @param consumers
     */
    private void consumerSubscribe(ConfigurableListableBeanFactory beanFactory, Set<BeanDefinition> consumers) {
        consumers.forEach(beanDefinition -> {
            log.info("rMessage init consumer {}",beanDefinition.getBeanClassName());
            try {
                Object bean = beanFactory.getBean(Class.forName(beanDefinition.getBeanClassName()));
                Method method = bean.getClass().getMethod(METHOD_MONITOR_MESSAGE);
                ReflectionUtils.invokeMethod(method,bean);
            } catch (ClassNotFoundException | NoSuchMethodException e) {
                e.printStackTrace();
            }
        });
    }

    /**
     * Parameter initialization
     *
     * @param beanDefinitions
     * @param beanFactory
     */
    private void mqInit(Set<BeanDefinition> beanDefinitions,final ConfigurableListableBeanFactory beanFactory) {

        RedissonClient redissonClient = beanFactory.getBean(RedissonClient.class);

        beanDefinitions.stream().filter(beanDefinition -> beanDefinition instanceof AnnotatedBeanDefinition).forEach(beanDefinition->{
            AnnotatedBeanDefinition annotatedBeanDefinition = (AnnotatedBeanDefinition)beanDefinition;
            AnnotationMetadata annotationMetadata = annotatedBeanDefinition.getMetadata();
            MergedAnnotation<RMessage> mergedAnnotation = annotationMetadata.getAnnotations().get(RMessage.class);
            String queryName = mergedAnnotation.getString(ATTRIBUTE_NAME_QUEUE);
            String topicName = mergedAnnotation.getString(ATTRIBUTE_NAME_TOPIC);
            String shortName = topicName+"."+queryName;

            RBlockingDeque<? super Serializable> blockingDeque = redissonClient.getBlockingDeque(shortName);
            messageQueue.put(shortName,blockingDeque);

            RDelayedQueue<? super Serializable> delayedQueue = redissonClient.getDelayedQueue(blockingDeque);
            offQueue.put(shortName,delayedQueue);

            RTopic topic = redissonClient.getTopic(topicName);
            topicMap.put(shortName,topic);
        });

    }



}

抽象队列主题列表

public abstract class AbstractQueue {

    Map<String, RDelayedQueue<? super Serializable>> offQueue = RMessageListener.offQueue;

    Map<String, RBlockingDeque<? super Serializable>> messageQueue = RMessageListener.messageQueue;

    Map<String, RTopic> topicMap = RMessageListener.topicMap;

    protected RDelayedQueue<? super Serializable> getRDelayedQueue() {
        return offQueue.get(shortName());
    }

    protected RBlockingDeque<? super Serializable> getMessageQueue() {
        return messageQueue.get(shortName());
    }

    private String shortName() {
        Annotation[] annotations = this.getClass().getAnnotations();
        RMessage rMessage = Arrays.stream(annotations).filter(annotation -> annotation instanceof RMessage)
            .map(annotation -> (RMessage)annotation).findAny().get();
        String queryName = rMessage.queue();
        String topicName = rMessage.topic();
        return topicName+"."+queryName;
    }

    protected RTopic getTopic() {
        return topicMap.get(shortName());
    }

}

抽象生产者模板

@Slf4j
public abstract class RMessageProducer<T extends Serializable> extends AbstractQueue {

    /**
     * 发送延时消息
     * @param message
     * @param delay
     * @param timeUnit
     */
    public void sendMessage(T message, long delay, TimeUnit timeUnit) {
        log.info("rMessage sendMessage: {}, delayTime {}",message.toString(),delay+timeUnit.name());
        super.getRDelayedQueue().offer(message,delay,timeUnit);
        super.getTopic().publish(this.hashCode());
    }

    /**
     * 发送异步消息
     * @param message
     */
    public void sendMessage(T message) {
        this.sendMessage(message,0,TimeUnit.MILLISECONDS);
    }

}

抽象消费者模板

@Slf4j
public abstract class RMessageConsumer<T extends Serializable> extends AbstractQueue {

    public void monitorMessage() {
        CompletableFuture.runAsync(this::pastConsumption);
        super.getTopic().addListener(Object.class,(c,m)-> {
            try {
                Object take = super.getMessageQueue().take();
                log.info("rMessage receiveMessage: {}, receiving time {}",take.toString(), LocalDateTime.now());
                this.useMessage((T)take);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
    }

    protected abstract void useMessage(T message);

    public void pastConsumption() {
        while (super.getRDelayedQueue().size() > 0 || super.getMessageQueue().size() > 0) {
            try {
                Object take = super.getMessageQueue().take();
                log.info("rMessage receiveMessage: {}, receiving time {}",take.toString(), LocalDateTime.now());
                this.useMessage((T)take);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}

具体使用

生产者

@RMessage(queue = "redisQuery",topic = "order")
public class RedissonProducer extends RMessageProducer<HashMap> {

}

@RestController
@RequestMapping("producer")
@AllArgsConstructor
public class ProducerController {

    private RedissonProducer redissonProducer;

    @PostMapping
    public String send() {
        HashMap<String,Object> map = new HashMap<>();
        map.put("name","张三");
        map.put("time", "测试顺序第二条"+LocalDateTime.now());
        redissonProducer.sendMessage(map,5, TimeUnit.MINUTES);
        return "send msg";
    }



}

消费者

@RMessage(queue = "redisQuery",topic = "order")
public class RedissonConsumer extends RMessageConsumer<HashMap> {

    @Override
    protected void useMessage(HashMap message) {
        System.out.println("接收到消息:"+message);
    }
}

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