基于Redisson的延遲佇列實作

package com.dong.mytest.demo.client;

import cn.hutool.extra.spring.SpringUtil;
import com.dong.mytest.demo.common.dto.DelayMessage;
import com.dong.mytest.demo.common.util.DateUtil;
import com.dong.mytest.demo.service.delayqueue.DelayQueueConsumer;
import com.google.common.collect.Lists;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RBlockingQueue;
import org.redisson.api.RDelayedQueue;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;

/**
 * @author dong
 */
@Slf4j
@Component
public class RedissonDelayQueueClient implements InitializingBean {

    @Resource
    private RedissonClient redissonClient;

    private final Map<String, RDelayedQueue<DelayMessage>> delayQueueMap = new ConcurrentHashMap<>(16);

    public void addDelayMessage(DelayMessage delayMessage) {
        log.info("delayMessage={}", delayMessage);
        if (delayQueueMap.get(delayMessage.getQueueName()) == null) {
            log.warn("queueName={},該延遲佇列不存在，請確認后再試...", delayMessage.getQueueName());
            return;
        }
        delayMessage.setCreateTime(DateUtil.getNowFormatStr());
        RDelayedQueue<DelayMessage> rDelayedQueue = delayQueueMap.get(delayMessage.getQueueName());
        rDelayedQueue.offer(delayMessage, delayMessage.getDelayTime(), delayMessage.getTimeUnit() == null ? TimeUnit.SECONDS : delayMessage.getTimeUnit());
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        // 有新的延遲佇列在這里添加，佇列消費類需要繼承DelayQueueConsumer，并且service名稱為 ${queueName}Consumer
        List<String> queueNameList = Lists.newArrayList("orderAutoCancelDelayQueue");

        // 加載延遲佇列
        for (String queueName : queueNameList) {
            DelayQueueConsumer delayQueueConsumer = SpringUtil.getBean(queueName + "Consumer");
            if (delayQueueConsumer == null) {
                throw new RuntimeException("queueName=" + queueName + ",delayQueueConsumer=null,請檢查配置...");
            }
            // Redisson的延時佇列是對另一個佇列的再包裝，使用時要先將延時訊息添加到延時佇列中，當延時佇列中的訊息達到設定的延時時間后，該延時訊息才會進行進入到被包裝佇列中，因此，我們只需要對被包裝佇列進行監聽即可，
            RBlockingQueue<DelayMessage> rBlockingQueue = redissonClient.getBlockingDeque(queueName);
            RDelayedQueue<DelayMessage> rDelayedQueue = redissonClient.getDelayedQueue(rBlockingQueue);
            delayQueueMap.put(queueName, rDelayedQueue);

            // 訂閱新元素的到來，呼叫的是takeAsync()，異步執行
            rBlockingQueue.subscribeOnElements(delayQueueConsumer::execute);
        }
    }
}

package com.dong.mytest.demo.common.dto;

import com.alibaba.fastjson.JSON;
import lombok.Data;

import java.io.Serializable;
import java.util.concurrent.TimeUnit;

/**
 * @author dong
 */
@Data
public class DelayMessage implements Serializable {

    private String queueName;

    private Long delayTime;

    private TimeUnit timeUnit;

    private String msgBody;

    private String createTime;

    @Override
    public String toString() {
        return JSON.toJSONString(this);
    }
}

package com.dong.mytest.demo.service.delayqueue;

import com.dong.mytest.demo.common.dto.DelayMessage;

/**
 * @author dong
 */
public interface DelayQueueConsumer {

    /**
     * 執行延遲訊息
     *
     * @param delayMessage delayMessage
     */
    void execute(DelayMessage delayMessage);

}

package com.dong.mytest.demo.service.delayqueue.impl;

import com.dong.mytest.demo.common.dto.DelayMessage;
import com.dong.mytest.demo.service.delayqueue.DelayQueueConsumer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

/**
 * @author dong
 */
@Service("orderAutoCancelDelayQueueConsumer")
@Slf4j
public class OrderAutoCancelDelayQueueConsumer implements DelayQueueConsumer {

    @Override
    public void execute(DelayMessage delayMessage) {
        log.info("====OrderAutoCancelConsumer=====delayMessage={}", delayMessage);
    }
}

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