✨Feat: 通过定时同步任务将 Redis 数据同步到数据库

src/main/java/cn/hezhaohui/thumb/job/SyncThumb2DBJob.java

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+package cn.hezhaohui.thumb.job;
+
+import cn.hezhaohui.thumb.mapper.BlogMapper;
+import cn.hezhaohui.thumb.model.entity.Thumb;
+import cn.hezhaohui.thumb.model.enums.ThumbTypeEnum;
+import cn.hezhaohui.thumb.service.ThumbService;
+import cn.hezhaohui.thumb.util.RedisKeyUtil;
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.date.DateTime;
+import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.text.StrPool;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import jakarta.annotation.Resource;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 定时将 Redis 中的临时点赞数据同步到数据库
+ *
+ */
+@Component
+@Slf4j
+public class SyncThumb2DBJob {
+
+    @Resource
+    private ThumbService thumbService;
+
+    @Resource
+    private BlogMapper blogMapper;
+
+    @Resource
+    private RedisTemplate<String, Object> redisTemplate;
+
+    @Scheduled(fixedRate = 10000)
+    @Transactional(rollbackFor = Exception.class)
+    public void run() {
+        log.info("开始执行");
+        DateTime nowDate = DateUtil.date();
+        // 如果秒数为0~9 则回到上一分钟的50秒
+        int second = (DateUtil.second(nowDate) / 10 - 1) * 10;
+        if (second == -10) {
+            second = 50;
+            // 回到上一分钟
+            nowDate = DateUtil.offsetMinute(nowDate, -1);
+        }
+        String date = DateUtil.format(nowDate, "HH:mm:") + second;
+        syncThumb2DBByDate(date);
+        log.info("临时数据同步完成");
+    }
+
+    public void syncThumb2DBByDate(String date) {
+        // 获取到临时点赞和取消点赞数据
+        String tempThumbKey = RedisKeyUtil.getTempThumbKey(date);
+        Map<Object, Object> allTempThumbMap = redisTemplate.opsForHash().entries(tempThumbKey);
+        boolean thumbMapEmpty = CollUtil.isEmpty(allTempThumbMap);
+
+        // 同步 点赞 到数据库
+        // 构建插入列表并收集blogId
+        Map<Long, Long> blogThumbCountMap = new HashMap<>();
+        if (thumbMapEmpty) {
+            return;
+        }
+        ArrayList<Thumb> thumbList = new ArrayList<>();
+        LambdaQueryWrapper<Thumb> wrapper = new LambdaQueryWrapper<>();
+        boolean needRemove = false;
+        for (Object userIdBlogIdObj : allTempThumbMap.keySet()) {
+            String userIdBlogId = (String) userIdBlogIdObj;
+            String[] userIdAndBlogId = userIdBlogId.split(StrPool.COLON);
+            Long userId = Long.valueOf(userIdAndBlogId[0]);
+            Long blogId = Long.valueOf(userIdAndBlogId[1]);
+            // -1 取消点赞，1 点赞
+            Integer thumbType = Integer.valueOf(allTempThumbMap.get(userIdBlogId).toString());
+            if (thumbType == ThumbTypeEnum.INCR.getValue()) {
+                Thumb thumb = new Thumb();
+                thumb.setUserid(userId);
+                thumb.setBlogId(blogId);
+                thumbList.add(thumb);
+            } else if (thumbType == ThumbTypeEnum.DECR.getValue()) {
+                // 拼接查询条件，批量删除
+                needRemove = true;
+                wrapper.or().eq(Thumb::getUserid, userId).eq(Thumb::getBlogId, blogId);
+            } else {
+                if (thumbType != ThumbTypeEnum.NON.getValue()) {
+                    log.warn("数据异常：{}", userId + "," + blogId + "," + thumbType);
+                }
+                continue;
+            }
+            // 计算点赞增量
+            blogThumbCountMap.put(blogId, blogThumbCountMap.getOrDefault(blogId, 0L) + thumbType);
+        }
+        // 批量插入
+        thumbService.saveBatch(thumbList);
+        // 批量删除
+        if (needRemove) {
+            thumbService.remove(wrapper);
+        }
+        // 批量更新博客点赞量
+        if (!blogThumbCountMap.isEmpty()) {
+            blogMapper.batchUpdateThumbCount(blogThumbCountMap);
+        }
+        // 异步删除
+        Thread.startVirtualThread(() -> {
+            redisTemplate.delete(tempThumbKey);
+        });
+    }
+}