How is the best way to start the EM on a Puma in cluster mode and on a Rails app?

[cavi21]

I'm trying to run EventMachine on an webserver that use Puma in cluster mode (so multiple workers are started), and that's running a Rails application and I found it hard to realize where should I start the EM.run { ... }, because I needed as a long running process because is needed to process messages using another gem called Faye.

If a put it in an rails initializer it seems that the code run every time a puma worker is spawned, so if I have multiple 4 workers, there will be 4 times that a code like this runs:

      if EventMachine.reactor_running?
        puts "[reactor_running]...."
        EventMachine.stop
      end
      Thread.new { EventMachine.run }

Is this a correct way to start only one EM? or how I should approach this? any pointer is appreciate it :)! thankss