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: base_listener.rb
    path of file: ./repos/chatwoot/app/listeners
    
    the code of the file until where you have to start completion: class BaseListener
  include Singleton

  def 
    
  def extract_notification_and_account(event)
    notification = event.data[:notification]
    notification_finder = NotificationFinder.new(notification.user, notification.account)
    unread_count = notification_finder.unread_count
    count = notification_finder.count
    [notification, notification.account, unread_count, count]
  end