An example of AOP in Ruby using Aquarium

aquarium_aop.rb

require 'rubygems'
require 'benchmark'
require 'aquarium'

ITERATIONS = 100_000

class MyProcessor
  def test_one
    1 + 1
  end
end

class MySecondProcessor
  def test_two
    sleep 3
    puts "I've awoken!"
  end
end

Benchmark.bmbm do |bm|
  bm.report('baseline') do
    ITERATIONS.times { MyProcessor.new.test_one }
  end
end

# Example results
#               user     system      total        real
#baseline   0.100000   0.010000   0.110000 (  0.054000)


class ProcessorTracer
  include Aquarium::DSL

  around :calls_to => :all_methods, :in_types => MyProcessor,
         :method_options => :exclude_ancestor_methods do |jp, object, *args|
    jp.proceed
  end

  around :calls_to => :all_methods, :in_types => /SecondProcessor/,
         :method_options => :exclude_ancestor_methods do |jp, object, *args|
    start = Time.now
    begin
      jp.proceed
    ensure
      puts "Time taken for '#{jp.target_type.name}\##{jp.method_name}': #{Time.now - start}"
    end
  end
end

puts ""
Benchmark.bmbm do |bm|
  bm.report('with AOP') do
    ITERATIONS.times { MyProcessor.new.test_one }
  end
end

#Example results
#               user     system      total        real
#with AOP   0.620000   0.000000   0.620000 (  0.528000)
#
# Overhead is about 4.7 microseconds per method call

MySecondProcessor.new.test_two