Ruby on Rails 数据库队列

Question

In my ruby on rails web app I want to queue DML operations.

Now I do not know if it would be best use an existing queue (like RabbitMQ) or to write my own but I guess writing my own would be a good idea.

Do you have any tips on how to write a database queue and integrate it in ruby on rails?

Thanks.

Answer 1

It's quite often you need some consumer-producer implementation on your own. You can create own processor and tasks, it's not so hard. Here is an example you can use. Just implement own backend logic using MySQL.

module MyJobs
    def self.backend
      @backend
    end

    def self.backend=(backend)
      @backend = backend
    end

  class Processor
    def self.start(concurrency = 1)
      concurrency.times { |n| new("Processor #{n}") }
    end

    def initialize(name)
      thread = Thread.new do
        loop do
          payload = MyJobs.backend.pop
          worker_class = payload[:worker]
          worker_class.new.perform(*payload[:args])
        end
      end

      thread.name = name
    end
  end

  module Worker
    module ClassMethods
      def perform_async(*args)
        MyJobs.backend.push(worker: self, args: args)
      end
    end
  end
end

MyJobs.backend = Queue.new
MyJobs::Processor.start(5)