From: ara.t.howard@...
Date: 2007-02-24T00:42:39+09:00
Subject: Re: Cute little simple scheduling code hack

On Fri, 23 Feb 2007, John Mettraux wrote:

> Hi,
>
> I had come up with that :
>
> http://openwferu.rubyforge.org/scheduler.html

looks very interesting!

> advantage : one thread for all the tasks disadvantage : has to wake up to
> pool its jobqueue

hmmm.  is that even possible?


     harp :~/openwferu/trunk/openwfe-ruby > cat a.rb
     require "time"
     require "openwfe/util/otime"
     require "openwfe/util/scheduler"
     include OpenWFE

     scheduler = Scheduler.new

     i = -1

     scheduler.schedule('*/1 * * * *') do
       4.times{ puts Time.now.iso8601(2); sleep 30 }  ### this takes 120s!
       puts(i += 1)
     end

     scheduler.sstart

     STDIN.gets



     harp :~/openwferu/trunk/openwfe-ruby > RUBYLIB=lib ruby a.rb
     2007-02-23T08:29:00.22-07:00
     2007-02-23T08:29:30.22-07:00
     2007-02-23T08:30:00.22-07:00
     2007-02-23T08:30:30.22-07:00
     0
     2007-02-23T08:31:00.47-07:00
     2007-02-23T08:31:30.47-07:00
     2007-02-23T08:32:00.47-07:00
     2007-02-23T08:32:30.47-07:00
     1
     2007-02-23T08:33:00.73-07:00
     2007-02-23T08:33:30.73-07:00
     2007-02-23T08:34:00.73-07:00
     2007-02-23T08:34:30.73-07:00
     2
     2007-02-23T08:35:00.98-07:00
     2007-02-23T08:35:30.98-07:00
     2007-02-23T08:36:00.98-07:00
     2007-02-23T08:36:30.98-07:00
     3
     2007-02-23T08:38:00.23-07:00
     2007-02-23T08:38:30.23-07:00
     ...
     ...
     ...

it seems like a single threaded/processed scheduler is an imposibility?

nevertheless i've already found a use for this code in a situation where i
don't care if events are fired precisely (as is possible) as i declare them or
not.

cheers.

-a
-- 
be kind whenever possible... it is always possible.
- the dalai lama