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173 lines
7.5 KiB
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<h1 class="title">Antlib Class Loaders</h1>
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<h3 class="section">
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<a name="Jose Alberto Fernandez"></a>
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Jose Alberto Fernandez
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</h3>
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<p>
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Let me first say that this feature appeared by the need to be able to say,
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</p>
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<pre class="code">
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<antlib name="A" classpathref="XYZ"/>
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<antlib name="B" classpathref="XYZ"/>
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</pre>
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<p>
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And being able to make sure that B and A use the same classLoader
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and therefore they can use each other components.
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</p>
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<p>
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My solution at the time was this idea of a named classloader that
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you could define using a classpath, and then tell your antlibs use
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this or that classloader, if you use the same classloader visibility
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is guaranteed.
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</p>
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<h3 class="section">
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<a name="Stefan Bodewig 23.04.2003 17:11"></a>
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Stefan Bodewig 23.04.2003 17:11
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</h3>
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<p>
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I understand that usecase (using the same class loader for 2 different antlibs)
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and think it's important. See Steve
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Loughran's comment on the .NET tasks wanting to have access to the
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datatypes defined in the cpptasks project for example.
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</p>
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<p>
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Take a look at what Costin had done to <taskdef> and <typedef> with
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the loaderref attribute. This has now (i.e. CVS HEAD) been
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generalized in ClasspathUtils, the infrastructure for named
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classloaders is there - at least the foundation for it.
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</p>
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<p>
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Stefan
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</p>
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<h3 class="section">
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<a name="Costin Manolache 29.04.2003 18:52"></a>
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Costin Manolache 29.04.2003 18:52
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</h3>
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<p>
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The main issue is how to enforce ordering to deal with dependencies
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between the antlibs.
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</p>
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<p>
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Or simply do not deal with dependencies, ie antlibs must not (yet)
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depend on on the other, except for the core ones.
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</p>
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<p>
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Using an unified class loader ( at least as default ) - like jboss is doing,
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or like JMX loading policy - has a lot of benefits. It also has some cases
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that are not well covered - so we'll probably need to deal with both
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"unified loader" and "loader hierarchy" cases.
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</p>
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</div>
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<p class="copyright">
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Copyright © 2000-2003 The Apache Software Foundation. All rights reserved.
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