From: Logan Capaldo <logancapaldo@...>
Date: 2005-12-19T18:02:30+09:00
Subject: Re: Thread specific singleton's


On Dec 19, 2005, at 2:12 AM, List Recv wrote:

> How do I make a thread specific Singleton?
>
> That is, once instance per thread.
>
> Related question: why do Singleton's use the Name.instance.method  
> idiom
> (using instance methods) as opposed to Name.method (using class
> methods), which seems simpler and clearer.
>
> -- 
> Posted via http://www.ruby-forum.com/.
>

def thread_singleton()
     Thread.current["my singleton"]  ||= MyOnePerThreadClass.new #  
note, don't  actually make MyOnePerThreadClass a "real"  singleton
end

Then whenever you want to use the thread singleton in a given thread  
use the thread_singleton function

e.g.:

Thread.start do
     thread_singleton.send_some_message
end

Thread.start do
       thread_singleton.send_other_message # a different singleton  
for this thread than the other thread, but will be the same for the  
duration of this thread
end

etc.


As far as your Name.method question, there's no particular reason not  
to.. If you want you can implement a singleton like that.