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From Nicola Ken Barozzi <nicola...@apache.org>
Subject Re: PROPOSAL: top level execution order
Date Tue, 26 Nov 2002 23:16:20 GMT

Costin Manolache wrote:
> I think this is the crucial issue for embed.
> 
> We agreed on allowing top-level tasks. There are 2
> implementations - one made by Stefan on the main branch
> and one in embed. 
> 
> In both cases a dummy target is created and 
> all top-level stuff is placed in this target. 
> 
> The difference is on the execution: 
> 
> - in the main branch, the top-level target is added
> as a dependency to all other targets. The dependency 
> resolver will compute the execution graph and make it 
> the first. This happen in execute(), after the XML
> processing is completed.
> 
> - in [embed], the top-level target is executed _before_
> resolving dependencies, as part of the XML processing
> 
> 
> The main consequence is that in [embed] we can have top-level
> tasks that operate on the build tree and affect the dependencies.
> Import ( and any similar task that will operate on the 
> tree level ) needs that.
> 
> The downside is that if tasks like <echo> or <javac> are used at top level,
> they will be executed when -projecthelp is called. 

The downside is that Centipede will no longer work :-(

We use this [embed] feature so that we can transform a template and 
import the result, all in one swoop, as has already been described here 
and it seemed to be a useful feature.

> Unfortunately it is not possible to implement -projecthelp 
> and also allow <javac> _and_ allow import in a clean way. 
> The only solution is to document this and explain the
> behavior - IMO javac at top level is a bad idea in the first place.
> 
> Opinions ?
> 
> I need a closure on this before anything else - if we keep
> the current behavior then <import> and a lot of other stuff
> will need to be rewritten ( so far I don't know any clean way
> to do it ).
> 
> Stefan - can you live with the top-level processing in embed ?

pleeeeeease

-- 
Nicola Ken Barozzi                   nicolaken@apache.org
             - verba volant, scripta manent -
    (discussions get forgotten, just code remains)
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