subscribe

# File actioncable/lib/action_cable/subscription_adapter/evented_redis.rb, line 33
      def subscribe(channel, message_callback, success_callback = nil)
        redis_connection_for_subscriptions.pubsub.subscribe(channel, &message_callback).tap do |result|
          result.callback { |reply| success_callback.call } if success_callback
        end
      end