You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: action_cable.rb
    path of file: ./repos/hyperstack/ruby/hyper-operation/lib/hyper-operation/transport
    
    the code of the file until where you have to start completion: module ApplicationCable
  class Channel < ActionCable::Channel::Base; end
  class Connection < ActionCable::Connection::Base; end
end

module Hyperstack
  class Ac
    
    def subscribed
      session_id = params["client_id"]
      authorization = Hyperstack.authorization(params["salt"], params["hyperstack_channel"], session_id)
      if params["authorization"] == authorization
        inc_subscription
        stream_from "hyperstack-#{params[:hyperstack_channel]}"
      else
        reject
      end