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From Dominique Devienne <DDevie...@lgc.com>
Subject RE: subant
Date Fri, 14 Mar 2003 15:23:51 GMT
The dependency ordering addition is pluggeable... you just provide a
resolver implementation. I created only one such implementation for my own
custom format, but a GUMP resolver format would be easy to write. It's just
the matter of parsing the GUMP descriptor, and creating instances that
implements DependencyNode (or provide a DependencyNodeAdapter if it doesn't)
that my DependencyResolver class knows how to sort. Probably Jenny could be
used to load the GUMP project instances, and a dependency adapter
implemented for it.

Note how buildpath returns a double array. This is to allow building in
parallel projects when possible: Consider the usual diamond A, B & C depends
on A, D depends on B & C, my resolver gives you:

{ {A}, {B,C}, {D} } which tells you can run B and C in parallel. Any project
within an inner array can be build in parallel provided their dependencies
(earlier stuff in the outer array) have been build before.

I already submitted SubAnt.java (the older version).
I now have these other classes I'd submit provided enough interest (the last
two are not of interest to anyone but me):

BuildPath.java
BuildPathResolver.java
DependencyCycleException.java
DependencyNode.java
DependencyNodeAdapter.java
DependencyNodeImpl.java
DependencyResolver.java
DependencyResolverTest.java

TahoeBuildPathResolver.java (private impl of BuildPathResolver)
TahoeProject.java (private impl of DependencyNode)

The build path resolver is specified and configured in a usual Ant way:

    <buildpath ident="buildpath"
resolverClassname="com.lgc.buildmagic.TahoeBuildPathResolver">
      <param name="destdir" value="${destdir}" />
      <param name="dependencies" value="${dependencies}" />
    </buildpath>

And the class loaded must implement the BuildPathResolver interface defined
below:

package com.lgc.buildmagic;

import java.io.File;

import org.apache.tools.ant.types.Parameterizable;

/**
 * Helper class allowing a <code>BuildPath</code> to be dynamically
 * inferred instead of being statically defined.
 * <p>
 * Provides the famous <em>extra level of indirection</em> which is the
 * solution to all computing problems ;-)
 *
 * @author <a href="mailto:ddevienne@lgc.com">Dominique Devienne</a>
 * @version Nov 2002 - Copyright (c) 2002, Landmark Graphics Corp.
 *
 * @see BuildPath
 * @see SubAnt
 */
public interface BuildPathResolver
                 extends Parameterizable {

    /**
     * Gets the sorted array of all the build directories or build files
     * that need to be build.
     *
     * @return a non-<code>null</code> but possibly empty array of build
     *         files and/or build directories. All returned files being
     *         directories instead of file will be appended with the anfile
     *         name defined by the &lt;subant&gt; task
     *         (which defaults to build.xml)
     */
    File[][] getBuildPath();

} // END class BuildPathResolver


-----Original Message-----
From: Nicola Ken Barozzi [mailto:nicolaken@apache.org] 
Sent: Friday, March 14, 2003 8:56 AM
To: Ant Developers List
Subject: Re: subant

Dominique Devienne wrote, On 14/03/2003 15.50:
> I actually signed off <lsync>, not <subant>, technically, but in practice
I
> give both. Anything I submit to BugZilla is good for the taking, and I'll
> refrain to include my usual/automatic copyright notice in the future.

Yees! lsync is koooool :-)

> Sorry to hear you suppressed passing down the current target name... That
> one of the feature of that task I won't live without. But that's OK, I'll
> keep using my own task then (actually I would anyhow for the dependency
> ordering I have).

Centipede does it using the Gump project descriptor. Could it be a wise 
thing to stick to one version of the two only, or does it make sense to 
have this anyway? (just asking)

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

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