redission布隆过滤器解决缓存穿透问题,定时刷新bloomFilter中的数据

布隆过滤器初体验:
项目启动时创建bloomFilter对象,给他存数据,再注入到容器里,这个就不写了,跟下面差不多

...
...

定时任务触发,清空bloomFilter,存入最新的数据。

/**
 * @author gaoyuzheng
 */
@Component
public class BloomTask {
    @Autowired
    PmsFeign pmsFeign;
    @Autowired
    RBloomFilter rBloomFilter;
    @Autowired
    RedissonClient redissonClient;
    //每天凌晨2点刷新bloomFilter
    @Scheduled(cron = "0 0 2 * * ? ")
    public void flashBloom(){
    	//不delete()原有旧数据还在
        rBloomFilter.delete();
        rBloomFilter = redissonClient.getBloomFilter("index:bloomFilter");
        //定时刷新,不需要设置特别大
        rBloomFilter.tryInit(50000l, 0.05);
        //openFeign远程调用 查询新数据 更新到bloomFilter
        ResponseVo<List<CategoryEntity>> categoryEntityByparentId = pmsFeign.getCategoryEntityByparentId(0l);
        List<CategoryEntity> categoryEntityList = categoryEntityByparentId.getData();
        for (CategoryEntity categoryEntity : categoryEntityList) {
            Long cId = categoryEntity.getId();
            rBloomFilter.add("categoryId:" + cId);
        }
    }
}

避免缓存穿透,判断有没有,没有就return

        if (!rBloomFilter.contains("categoryId:"+cId)){
            return null;
        }

完成!!!

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