From: Daniel Harple <dharple@...>
Date: 2006-06-10T07:07:29+09:00
Subject: Re: ... building my own end-fix statements.

On Jun 9, 2006, at 11:49 PM, Jeff Wood wrote:

> until and while are similar enough, but not 'when' ...
>
> I see that you are saying I could get away with two statements ..
>
> sleep 0.5 until a.ready?
> a.doSomething
>
> ... but I'm still looking for that one layer deeper.
>
> a.doSomething when a.ready?
>
> ... anyways ... thanks for the info ... hadn't seen until

Maybe observer.rb will fit your needs? Can you give a more specific  
example of what you would like to do?

require 'observer'

class HomelandSecurityAdvisorySystem
   def initialize
     @level = "LOW"
   end
   include Observable
   attr_reader :level
   def level=(new_level)
     changed()
     notify_observers(new_level)
     @level = new_level
   end
end

class LevelNotifier
   def update(level)
     case level
       when "LOW"
         puts "Everything is ok."
       when "GUARDED"
         puts "Uh oh"
       when "ELEVATED"
         puts "Watch FOX for the most up-to-date info"
       when "HIGH"
         puts "We're not fear-mongering."
       when "SEVERE"
         puts "You're dead"
     end
   end
end

x = HomelandSecurityAdvisorySystem.new
x.add_observer(LevelNotifier.new)
x.level = "ELEVATED"
x.level = "SEVERE"

-- Daniel