Decoupled Analytics

01-business_case.rb

class SomeBusinessCase
  include Wisper

  def execute(attributes)
    if true
      publish(:some_business_case_successful, details)
    else
      publish(:some_business_case_failed, details)
    end
  end
end

02-stats_listener.rb

# app/listeners/statistics_listener.rb

class StatisticsListener
  def some_business_case_successful(details)
    # store stats...
  end
  
  # lots more callback methods...
end

03-some_controller.rb

class SomeController
  def create
    business_case = SomeBusinessCase.new
    business_case.subscribe(StatisticsListener.new)
    business_case.on(:some_business_case_successful) { |details| redirect_to somewhere }
    business_case.on(:some_business_case_failed)     { |details| render :action => :new }
    business_case.execute(params[:stuff]    
  end
end