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Application Context in Rails

Rails comes with a convenient hash session in which we can squeeze stuff into our hearty content. However, I would like something like the context of an ASP application that, instead of sharing data for only one session, will share it with all sessions in one application. I am writing a simple toolbar application and would like to retrieve data every 5 minutes, not every 5 minutes for each session.

I could, of course, store the cache update times in the database, but so far there was no need to configure the database for this application and I would like to avoid this dependency, if possible.

So, is there a way to get (or simulate) such things? If it is not possible to do this without a database, is there any “fake” database engine that comes with Rails that works in memory but does not bother current data between reboots?

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7 answers

Correct answer : memcached. Fast, clean, supports several processes, now it is very clean using Rails. It's not even that bad to set up, but that’s another thing to keep working.

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What you ask for is completely impossible in Rails because of how it is designed. What you are asking for is a shared object, and Rails is strictly single-threaded. Memcached or a similar tool for exchanging data between distributed processes is the only way to go.

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Rails.cache freezes stored objects. This approach makes sense for the cache, but NOT for the application context. I assume that instead of going to the moon to complete this simple task, all you have to do is create a constant inside config / environment.rb

APP_CONTEXT = Hash.new

Pretty simple, huh?

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Source: https://habr.com/ru/post/1697263/

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