perflog.rb

require 'pry'

# APPROACH 1

module PerfLogger
  def perflog(func_name)
    new_name_for_old_function = "#{func_name}_old".to_sym
    alias_method(new_name_for_old_function, func_name)
    define_method(func_name) do |*args|
      puts "about to call #{func_name}(#{args.join(', ')})"
      send(new_name_for_old_function, *args)
    end
  end
end

class ExampleClass
  extend PerfLogger

  def instance_method(foo, bar)
    puts "In the instance method with foo=#{foo} & bar=#{bar}"
  end
  perflog(:instance_method)

  def self.class_method(foo, bar)
    puts "In the class method with foo=#{foo} & bar=#{bar}"
  end
  # perflog(:class_method)
end

def bare_method(foo, bar)
  puts "In the bare method with foo=#{foo} & bar=#{bar}"
end
# perflog(:bare_method)


# ExampleClass.new.instance_method("Uno", "Dos")
# ExampleClass.class_method("Tres", "Quatro")
# bare_method("Cinco", "Seis")






# APPROACH 2
def perflog(method_name)
  method = method(name)
  puts "in flog hook"
end

perflog def method_to_perflog(foo, bar)
  puts "in method_to_perflog with foo=#{foo} & bar=#{bar}"
end

puts "methods hooked"
method_to_perflog("biz", "baz")