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From "Andrew Close" <acl...@gmail.com>
Subject Re: Parallel task...
Date Wed, 24 Jan 2007 21:34:53 GMT
Dominique,

thanks for the reply.  i'll heed your advice and stay away from
parallel for now.  it just looked like a nice way to process some of
the 'optional' tasks we have. :)
i'll take a look at your other suggestions.
thanks again

andy

On 1/24/07, Dominique Devienne <ddevienne@gmail.com> wrote:
> > i'm looking at the use of the parallel task to run some optional jobs
> > during my build.  this looks like it would be perfect for doing things
> > like javadoc, junit, jprobe, etc. however, i would like to be able to
> > switch my optional tasks so that they are only run if a flag was set.
> > currently i have each of them in their own target and use the
> > if="flag_set" attribute in the target.  but this doesn't allow me to
> > run them in parallel.  is there a way to run these as 'switched' tasks
> > within a parallel target?
>
> That's an usual request.
>
> > <target name="junit" depends="package" if="run_junit">
> >   <ant antfile="junit.xml />
> > </target>
> >
> > <target name="javadoc" depends="package" if="run_javadoc">
> >   <ant antfile="javadoc.xml" />
> > </target>
>
> Ah, each of these is its own build file!
>
> In this case, what I'd do is use <exec spawn="${in-parallel}"> to run
> the (optional) sub-build, in it's own process. Simply changing the
> value of the 'in-parallel' property changes the behavior from
> sequential to parallel. This way, you achieve parallelism at the
> process level, and not the thread level, which should be more robust
> anyway.
>
> Then your 'optional_tasks' target simply depends on the other targets
> to spawn, and an additional one that simply sets the right properties
> to get the behaviour you want in the former.
>
> With spawn="true", you loose the output of the spawed process, but you
> can configure that process to log to a file. There are examples in the
> archieves to emulate <ant fork="true"> with <java> or <exec>, and
> adding spawn="true" is simply a variation.
>
> Probably not what you wanted to hear, sorry ;-)
>
> I've used Ant for a long time, but except for parallel-<get>s one
> time, I've shied away from <parallel>, as many weird things can happen
> in Ant with it, IMHO. It's not a task for the faint-of-heart ;-) Good
> luck, --DD
>
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