redis延时队列

1. 引入

<redisson.version>3.15.5</redisson.version>
    <dependency>
      <groupId>org.redisson</groupId>
      <artifactId>redisson-spring-boot-starter</artifactId>
      <version>${redisson.version}</version>
    </dependency>

2. 放入延时队列

  import org.redisson.api.RedissonClient;
  
  @Autowired
  private RedissonClient redissonClient;
  public static final String CardKitMessageDelayQueue = "QUEUE:CARD_KIT";

      // 发送延时消息
      RBlockingDeque<CardKitRedisBo> blockingDeque = redissonClient
              .getBlockingDeque(CardKitMessageDelayQueue);
      RDelayedQueue<CardKitRedisBo> delayedQueue = redissonClient.getDelayedQueue(blockingDeque);
      // 计算时间戳
      long delayInSeconds = calculateDifference(model.getSendTime(), LocalDateTime.now());
      CardKitRedisBo cardKitRedisBo = new CardKitRedisBo();
      cardKitRedisBo.setId(model.getId()).setTemplateId(model.getTemplateId());
      delayedQueue.offer(cardKitRedisBo, delayInSeconds, TimeUnit.SECONDS);

3. 监听延时队列

import cn.hutool.json.JSONUtil;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RBlockingDeque;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.cloud.sleuth.Span;
import org.springframework.cloud.sleuth.Tracer;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

@Slf4j
@Component
public class CardKitMessageListener implements ApplicationRunner {

  public static final String CardKitMessageDelayQueue = "QUEUE:CARD_KIT";

  public static final String CardKitMessageDelayLock = "LOCK:CARD_KIT";

  @Resource
  private RedissonClient redissonClient;

  @Autowired
  private Tracer tracer;

  @Autowired
  private CardKitService cardKitService;

  @Override
  public void run(ApplicationArguments args) {
    new Thread(() -> {
      RBlockingDeque<CardKitRedisBo> blockingDeque = redissonClient.getBlockingDeque(CardKitMessageDelayQueue);
      while (true) {
        // 获取定时任务锁
        RLock rLock = redissonClient.getLock(CardKitMessageDelayLock);
        try {
          // 最多等待5秒
          boolean isLocked = rLock.tryLock(5, TimeUnit.SECONDS);
          if (isLocked) {
            Span span = tracer.nextSpan().name("OccupationMessage").start();
            try (Tracer.SpanInScope ws = tracer.withSpan(span)) {
              CardKitRedisBo poll = blockingDeque.take();
              log.info("获取延时消息：{}", JSONUtil.toJsonStr(poll));
              // 消费消息
              cardKitService.sendCardKit(poll);
            } finally {
              try {
                rLock.unlock();
              } catch (Exception ex) {
                log.warn("锁释放失败：" + ex.getMessage());
              }
              try {
                span.end();
              } catch (Exception ex) {
log.error("失败", ex)
              }
            }
          }
        } catch (Exception ex) {
          log.error("延迟消息处理异常：" + ex.getMessage(), ex);
        }
      }
    }).start();
  }
}

原文地址：https://blog.csdn.net/hello_word_demo1/article/details/143920130

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