一、重点
代码讲解:7.3点赞功能-定时持久化到数据库-Java程序整合pipeline+lua_哔哩哔哩_bilibili
https://www.bilibili.com/video/BV1Lg4y1w7U9
代码:
blogLike_schedule/like08 · xin麒/XinQiUtilsOrDemo - 码云 - 开源中国 (gitee.com)
https://gitee.com/flowers-bloom-is-the-sea/XinQiUtilsOrDemo/tree/master/blogLike_schedule/like08
数据库表:
blogLike_schedule · xin麒/XinQiUtilsOrDemo - 码云 - 开源中国 (gitee.com)
二、实现过程:
这里主要是开2个定时任务,一个是平时的缓存数据持久化操作就是要pipeline技术;
另一个时间就使用lua脚本向redis缓存获取缓存数据再更新到数据库。
1、对lua脚本任务执行:
@Slf4j
public class LikeTaskAtNight extends QuartzJobBean {@AutowiredBlogService blogService;@AutowiredStringRedisTemplate stringRedisTemplate;/*** 用来从redis中的zset中获取点赞缓存的键值对,间隔时间存入mysql* 这里就夜间执行吧,因为lua会阻塞redis其他操作,选择夜间流量低时进行执行* @param context* @throws JobExecutionException*/@Overrideprotected void executeInternal(JobExecutionContext context) throws JobExecutionException {int hour = LocalTime.now().getHour();
// int minute = LocalTime.now().getMinute();if (hour == 3){// 要执行的内容就写在这个函数中
// blogService.updateAllLikeListToDatabase();//这个没使用pipeline技术,效果应该是明显低于updateAllLikeListToDatabaseByPipeline1log.debug("LikeTaskAtNight - time is {}",System.currentTimeMillis());
// blogService.updateAllLikeListToDatabaseByPipeline1();//这个使用了pipeline技术,但是还有优化空间,比如书对sql的更新可以说批量更新blogService.updateAllLikeListToDatabaseByLua();//这个使用了lua技术,但是还有优化空间,比如书对sql的更新可以说批量更新}}}
配置文件:
import com.xinqi.task.LikeTask;
import com.xinqi.task.LikeTaskAtNight;
import org.quartz.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class QuartzConfig {@Beanpublic JobDetail quartzDetail_1(){// withIdentity指定的是这个job的idreturn JobBuilder.newJob(LikeTask.class).withIdentity("LIKE_TASK_IDENTITY").storeDurably().build();}@Beanpublic Trigger quartzTrigger_1(){ //触发器SimpleScheduleBuilder scheduleBuilder = SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(20) //设置时间周期单位秒
// .withIntervalInHours(2) //两个小时执行一次.repeatForever();return TriggerBuilder.newTrigger().forJob(quartzDetail_1())
// .forJob(quartzDetail_2()).withIdentity("LikeTask_TRENDS_TRIGGER").withSchedule(scheduleBuilder).build();}@Beanpublic JobDetail quartzDetail_LikeTaskAtNight(){// withIdentity指定的是这个job的idreturn JobBuilder.newJob(LikeTaskAtNight.class).withIdentity("LikeTaskAtNight_IDENTITY").storeDurably().build();}@Beanpublic Trigger quartzTrigger_2(){ //触发器SimpleScheduleBuilder scheduleBuilder = SimpleScheduleBuilder.simpleSchedule()
// .withIntervalInSeconds(35) //设置时间周期单位秒.withIntervalInHours(1) //两个小时执行一次.repeatForever();return TriggerBuilder.newTrigger().forJob(quartzDetail_LikeTaskAtNight())
// .forJob(quartzDetail_2()).withIdentity("LikeTaskAtNight_USER_TRENDS_TRIGGER").withSchedule(scheduleBuilder).build();}}
updateAllLikeListToDatabaseByLua执行的内容:
@Override
public void updateAllLikeListToDatabaseByLua() {String prefix = "BLOG_LIKED_KEY";Map<Long, Map<String, String>> maps = getMapsByLuaUseJedis(prefix);if (maps == null || maps.size() == 0) return;for (Map.Entry<Long, Map<String, String>> entry : maps.entrySet()) {Long blogId = entry.getKey();Map<String, String> likeList = entry.getValue();updateLikeListByBlogId(blogId, likeList);}
}
public Map<Long, Map<String, String>> getMapsByLuaUseJedis(String prefix) {Map<Long, Map<String, String>> maps = null;String script = "local prefix = KEYS[1]; \n" +"local redisKeys = redis.call('keys',prefix ..'*');\n" +"\n" +"if(not redisKeys) \n" +" then \n" +" \treturn (nil);\n" +"end;\n" +"\n" +"local maps = {};\n" +"\n" +"for i, v in pairs(redisKeys) do\n" +" local blogId = string.sub(v,string.len(prefix) + 1,string.len(v));\n" +" local zset = redis.call('zrange',v,'0','-1','withscores');\n" +" table.insert(maps,blogId);\n" +" table.insert(maps,zset); \n" +"end;\n" +"\n" +"return maps;";List result = null;result = getResultByLuaUseJedis(script, prefix);maps = parseLuaResultToMaps(result);return maps;}
private List getResultByLuaUseJedis(String script, String prefix) {Jedis jedis = null;List result = null;int failTime = 0;//执行失败的次数boolean flag = true;//如果为true就说明报错while (flag && failTime < 2) {try {jedis = jedisPool.getResource();result = (List) jedis.eval(script, Arrays.asList(prefix), new ArrayList<>());//https://blog.csdn.net/EnjoyFight/article/details/127808971System.out.println("result is " + result);//result is [1, [1, 1688218686914]]
/* log.debug("result is ",result);//不知道为什么无法显示log.debug("result is null?{}",result==null);String s = JSONUtil.toJsonStr(result);log.debug("s is ",s);log.debug("s is null? {}",s==null);log.debug("s .len is {}",s.length());*/flag = false;} catch (Exception e) {e.printStackTrace();failTime++;} finally {if (jedis != null) jedis.close();}}return result;}
2、pipeline技术定时任务
看这篇文章吧:(108条消息) springboot+redis+mysql+quartz-通过Java操作jedis使用pipeline获取缓存数据定时更新数据库_xin麒的博客-CSDN博客
三、其他
本文章的具体内容基本上都是在视频里面了,就不多描述了。
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(108条消息) springboot+redis+mysql+quartz-通过Java操作jedis定时使用lua脚本获取缓存数据并更新数据库_xin麒的博客-CSDN博客
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