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From "Wannheden, Knut" <knut.wannhe...@paranor.ch>
Subject RE: can <subant> reuse Projects?
Date Thu, 14 Aug 2003 14:05:39 GMT
Dominique,

> Even my current use of <antReturn> I find hackish, but 
> without the ability
> to use Ant's own digester-like XML to Java engine, I find 
> easier to call
> another Project and extract what I need out of it, rather 
> than coding from
> scratch the info I need about of a separate non-Ant (data-type) file.
> 

Maybe the xpath PropertyHelper would help you in this case.

My version of <subant> (not based on it (yet)) does what I suggested, but
not by reusing Projects, because it's also internally using <ant> :-)
Rather I have a static Map which tells me what targets I've already run on
what buildfiles.

Of course it's not always desirable to run a target only exactly once.  But
IMO, if the buildfiles are well organized, this should be the case.  At
least for project inter-dependencies.  And I can of course always get around
this "optimization" by using <ant> instead.  Also my <subant> has a
"onlyonce" attribute to control this.

I found that I can significantly lower my build times with this behaviour.
Also the log is more readable.

I think I will continue using my own <subant>.  But if someone thinks this
is a good idea I could write a patch which would add a "onlyonce" attribute
to Ant's <subant>.

--
knut

> I hope I'm not too off base vis-à-vis your question. --DD
> 
> > -----Original Message-----
> > From: Knut Wannheden [mailto:knut.wannheden@paranor.ch]
> > Sent: Thursday, August 14, 2003 6:40 AM
> > To: dev@ant.apache.org
> > Subject: can <subant> reuse Projects?
> > 
> > Hi,
> > 
> > Up until now I've been using my own <subant> like task.  
> But now that Ant
> > 1.6 doesn't seem too distant anymore I'd like to integrate 
> with <subant>.
> > 
> > There's one thing I'm wondering about: Can <subant> reuse 
> the same Project
> > object corresponding to a buildfile in multiple calls?  The 
> reason that
> > I'm
> > askin this is that I think it would be nice if a target's 
> dependencies
> > were
> > only resolved once.  Consider the following case:
> > 
> >          a.xml
> >            ^
> >          /   \
> >     b.xml    c.xml
> >        ^      ^
> >         \    /
> >          d.xml
> > 
> > where I in b.xml and c.xml use <subant> to invoke a target 
> i a.xml.  And
> > in
> > d.xml i use <subant> to invoke a target in b.xml and c.xml. 
>  Now if both
> > b.xml and c.xml invoke the same target "foo" in a.xml, then 
> I'd only want
> > the dependencies of "a:foo" to be resolved once.
> > 
> > Is this currently possible with <subant> or would it be 
> possible to add
> > this
> > behaviour?
> > 
> > --
> > knut
> 
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