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perf[orm]: 简化代码
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@@ -56,4 +56,18 @@ cron表达式的用法
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spring自带的Scheduled和zfoo的Scheduler
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java的线程池,SingleThreadScheduledExecutor,SingleThreadExecutor
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通过spring自带的CronExpression计算下一次cron表达式要执行的时间
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```
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```
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### [第六讲](https://www.bilibili.com/video/BV1to4y1C77Y)
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- scheduler原理讲解
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- 知识点
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```
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Mysql中的数据库,表,一条数据,在Mongodb分别叫做,数据库,集合,文档
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Elastic Search的全文搜索引擎
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Java的缓存框架guava cache,还有它的升级版本caffeine
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mongodb的map reduce操作
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分布式唯一Id,Java自带的UUID,雪花算法(SnowFlake),Redis分布式唯一Id实现,Mongodb分布式唯一Id实现,Zookeeper分布式唯一Id实现
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```
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