From: "Simon Kröger" <SimonKroeger@...>
Date: 2006-04-22T04:23:32+09:00
Subject: Re: Synchronized object

Logan Capaldo wrote:

> Well it's not quite as easy as Java but:
> http://www.ruby-doc.org/stdlib/libdoc/monitor/rdoc/index.html
> 
> 
> obj.methods.each do |meth|
>    (class << obj; self; end).module_eval <<HERE
>       def #{meth}(*args, &block)
>           self.synchronize { super }
>       end
> HERE
> 
> end
> 
> obj.extend(MonitorMixin)
> 
> I did it in that order since I wouldn't want a synchronize { synchronize }

accepted answer ... well kind of. ;)

running your code (with an empty array) gave me:

ruby 1.8.4 (2005-12-24) [i386-mswin32]

(eval):1: warning: redefining `__send__' may cause serious problem
(eval):1: warning: redefining `__id__' may cause serious problem
(eval):2:in `extend': undefined method `synchronize' for
#<Array:0x2816468> (NoMethodError)

but i got the right idea i think. My code now looks like:
---------------------------------------------------------------------
require 'monitor'

def sync obj
  meth = obj.methods - %w{__send__ __id__}
  klass = class << obj.extend(MonitorMixin); self; end
  meth.each{|m|klass.module_eval "def #{m}(*a,&b)synchronize{super}end"}
  obj
end

---------------------------------------------------------------------

usage:
---------------------------------------------------------------------
obj = sync([])
obj.push 'a'
p obj
---------------------------------------------------------------------

and now that i see it, it looks quite simple :)

thanks to all of you who responded

cheers

Simon