Listing 2. update-stocks.rb

#!/usr/bin/env ruby

COMPANIES = %w(ABC DEF GHI JKL MNO)

require 'pusher'

Pusher.app_id = APP_ID_FROM_PUSHER
Pusher.key = 'KEY_FROM_PUSHER'
Pusher.secret = 'SECRET_FROM_PUSHER'


loop do
  company = COMPANIES.sample
  price = rand 100
  Pusher['stock_ticker'].trigger('update_event', { :name => company, :price => price})

  sleep 5
end