From: ara.t.howard@...
Date: 2006-04-27T02:12:43+09:00
Subject: Re: Rake task dependeny vs. method call

On Thu, 27 Apr 2006 Ara.T.Howard@noaa.gov wrote:

> but by redefining tasklib.rb to use tsort both task lists function correctly:
>
>
>    harp:~ > cat a.rb
>    require 'tasklib2'
>
>    task :uidgen do |*argv| (seed = argv.shift) ? rand(seed) : 
> $UID||=uidgen(42) end
>
>    task :a => :uidgen do y "a" => $UID end
>    task :b => :a do y "b" => uidgen(42) end
>    task :c => :a do y "c" => uidgen(42) end
>    task :d => [:b, :c] do y "d" end
>
>    d()
>
>
>    harp:~ > ruby a.rb
>    ---
>    a: 5
>    ---
>    b: 15
>    ---
>    a: 5
>    ---
>    c: 3
>    --- d


i realized as soon as i hit send this error.  the dag run should be looked up
from the global dat (TH in tasklib2) so a does not get run more than once.
like i said, my impl wasn't perfect but, by using tsort, we can indeed enforce
only the declared call graph.

sorry for the mistake.

cheers.


-a
-- 
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama