af_write_logging.rb

require 'active_fedora/base'
require 'singleton'

class CallCounter
  include Singleton
  attr_reader :result

  def initialize
    @result = {}
    @mutex = Mutex.new
  end

  def count(klass, id, method)
    @mutex.synchronize do
      @result[method] ||= {}
      @result[method][klass] ||= {}
      @result[method][klass][id] ||= 0
      @result[method][klass][id] += 1
    end
  end
end

module ActiveFedora
  class Base
    [:update_index, :save, :save!, :update, :update!, :delete].each do |method|
      alias_method "_#{method}".to_sym, method

      define_method method do |*args|
        self.send("_#{method}".to_sym, *args).tap do
          CallCounter.instance.count(self.class.name, self.id, method)
        end
      end
    end
  end
end