如何实现“触发"对于 redis 数据存储? [英] How to implement "trigger" for redis datastore?

问题描述

我有一个程序，它将轮询 redis 数据存储中的某个键，并在该值满足某个条件时执行某些操作.

I have a program, which will poll on a certain key from the redis datastore, and do something when the value satisfies a certain condition.

但是，我觉得定期轮询redis效率很低，我想知道redis是否有触发"机制，当值发生变化并满足条件时，会调用触发器.触发器可能是一个RPC函数，也可能是一个HTTP msg，或者其他什么，这样我就不再需要轮询它了，就像poll和interrupt的区别一样.

However, I think periodically polling on redis is quite inefficient, I'm wondering if there is a "trigger" mechanism for redis, when the value changes and satisfies the condition, the trigger will be called. The trigger might be a RPC function, or an HTTP msg, or something else, so that I don't need to poll on it any more, just like the difference between poll and interrupt.

这可能吗?

推荐答案

您可以使用 Pub/Sub Redis 的特性.鉴于您所描述的情况，这正是您所需要的.

You can use the Pub/Sub feature of Redis. It's exactly what you need given your circumstances as you described.

本质上，您SUBSCRIBE 到频道"，应用程序的另一部分写入(PUBLISH)更改到该频道的值.您的订阅者(消费者、想要了解更改的客户)将几乎实时收到通知.

Essentially, you SUBSCRIBE to a "channel", and the other part of your application writes (PUBLISH) the value being changed to that channel. Your subscriber (consumer, the client that wants to know about the change) will get notified in virtually realtime.

这篇关于如何实现“触发"对于 redis 数据存储?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！