Exploration of the Ruby Gem Wisper in the context of class-level subscriptions

wispertest.rb

#!/usr/bin/env ruby
# 
# License: MIT
# Author: Konstantin Gredeskoul
#
# This is a simple conceptual script to explore the gem Wisper, but unlike the examples in the README
# using the class methods and class-level subscriptions similar to how another gem Ventable
# accomplishes something similar. Wisper passes with flying colors.
#
# ## Usage
#
# ```bash
#    gem install wisper colored2
#    # download the gist to wispertest.rb
#    ruby wispertest.rb 100
#    ruby wispertest.rb 101
# ```
#

require 'wisper'
require 'colored2'

class EmailService
  def self.form_published(id)
    puts "EmailService: sending email because form #{id} is published".green
  end
end


class ErrorLogger
  def self.form_publishing_failed(id, msg = '')
    puts "ErrorLogger: logging form publishing failure for form #{id} #{msg.yellow}".red
  end
end


class FormsService
  extend Wisper::Publisher

  subscribe EmailService
  subscribe ErrorLogger

  def self.activate(id)
    id.even? ? broadcast(:form_published, id) : 
               broadcast(:form_publishing_failed, id, 'form publishing failed because its ID was odd...')
  end
end


class Main
  def self.call(id)
    
    FormsService.on(:form_published) { |id| puts "main: form #{id} publishing succeeded!" }
    FormsService.on(:form_publishing_failed) { |id| puts "main: form #{id} pubshing broke" }

    FormsService.activate(id)
    FormsService.activate(id + 10001)
  end
end

ARGV.empty? ? puts("usage: #{$0} id"): Main.call(ARGV.first.to_i)