How do I process ActiveSupport::Notifications events?

I've looked at the documentation for ActiveSupport::Notifications but I'm a little unclear about how to use it. Here's what I have right now:

class Foo
  ...

  def xyz
    # other stuff
    ActiveSupport::Notifications.instrument(:interesting)
      expensive_operation(123, 'apple')    # We want to instrument this.
    end
  end
end

What I would like to do is have another class, Auditor, invoke puts "event #{e开发者_JAVA技巧vent}" whenever the interesting event is raised. How do I do that?

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A good resources is from railscast.com

http://railscasts.com/episodes/249-notifications-in-rails-3

Another resource that you can take a look at is Jose Valim's book Crafting Rails Application.

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Here are a few good resources to get you started:

• Using ActiveSupport::Notifications and ActiveSupport::Concern To Create An Audit Trail
• Digging Deep with ActiveSupport::Notifications
• ActiveSupport::Notifications API Documentation
• Active Support Instrumentation Rails Guide - This contains a list of all available notifications that you can subscribe to.
• RailsCasts #249 - Notifications in Rails 3