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In some cases, we might want to run our code at specific times. Not necessarily every 3 minutes, but every day at 08.00AM. While this is perfectly achievable leveraging the same tools, I'll be pragmatic and recommend Quantum. It allows you to schedule the execution of functions with a cron syntax and takes away all the complexity of managing processes. It's a seasoned library, widely-adopted within the community, very lightweight... And extremely simple.
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However, while Elixir does provide the necessary abstractions to make caching easy, my recommendation on this one is usually to lean on the community's shoulders. Saša Jurić, for example, wrote a while back ConCache which does exactly this, but there are many others out there. The good thing about not implementing one it's own is that there are many edge cases when dealing with concurrency and it's easy to get it wrong the first few times. As they say, the two hardest problems in computer science are naming and caching.
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