Move EventMachine initialization to Runner::EventLoop

app/models/runner.rb

@@ -41,7 +41,6 @@ class Runner < ApplicationRecord
   end
 
   def attach_to_execution(command, &block)
-    ensure_event_machine
     starting_time = Time.zone.now
     begin
       # As the EventMachine reactor is probably shared with other threads, we cannot use EventMachine.run with
@@ -66,22 +65,6 @@ class Runner < ApplicationRecord
 
   private
 
-  # If there are multiple threads trying to connect to the WebSocket of their execution at the same time,
-  # the Faye WebSocket connections will use the same reactor. We therefore only need to start an EventMachine
-  # if there isn't a running reactor yet.
-  # See this StackOverflow answer: https://stackoverflow.com/a/8247947
-  def ensure_event_machine
-    unless EventMachine.reactor_running? && EventMachine.reactor_thread.alive?
-      event_loop = Runner::EventLoop.new
-      Thread.new do
-        EventMachine.run { event_loop.stop }
-      ensure
-        ActiveRecord::Base.connection_pool.release_connection
-      end
-      event_loop.wait
-    end
-  end
-
   def request_id
     request_new_id if runner_id.blank?
   end