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obsidian-sync/日常学习/中间件/redis/队列实现.md

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一、异步消息队列

list 可以作为异步队列使用，用rpush和lpop（右进左出）或lpush和rpop(左进右出) !Snipaste_2023-02-23_10-00-41 20.png 当队列为空时，如果一直pop会陷入pop死循环，可以采用与Future.get原理相同的阻塞读方法 blpop/brpop 其中b代表blocking

二、优先级队列

使用zset实现优先级队列，score作为优先级分数

三、延时队列

使用zset实现延迟队列，将消息序列化成一个字符串作为zset的value，消息的时间作为到期时间score，然后用多个线程轮询zset获取到期的任务进行处理。