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: hook.rb
    path of file: ./repos/ekylibre/lib/ekylibre
    
    the code of the file until where you have to start completion: module Ekylibre
  class Hook
    @subscriptions = {}.with_indifferent_access

    class << self
      # Publish a given event/message
      def publish(message, data = {})
        Rails.logger.info("Publish: #{message.to_s.yellow}")
        if @subscriptions[message] && @subscriptions[message].any?
          @subscriptions[message]
    
      def publish(message, data = {})
        Rails.logger.info("Publish: #{message.to_s.yellow}")
        if @subscriptions[message] && @subscriptions[message].any?
          @subscriptions[message].each_with_index do |block, index|
            Rails.logger.info "Push to #{message}##{index}".yellow
            if block.arity >= 1
              block.call(data)
            else
              block.call
            end
            Rails.logger.info "Push to #{message}##{index}: terminated".yellow
          end