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Wildcard support in Dynamic-imports
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reply from <a href="http://community.jboss.org/people/alesj">Ales Justin</a> in <i>JBoss Microcontainer Development</i> - <a href="http://community.jboss.org/message/547040#547040">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote">public class Module {<p>    public DelegateLoader resolveWildcard(...)</p><p>    {</p><p>         WildcardDelegateLoader result = new WilcardDelegateLoader(...);</p><p>         return result.resolve(...); // HERE ??</p><p>    }</p><p>}</p></blockquote><p>I don't understand the idea behind resolve().</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I thought we would simply create a single WildcardDelegateLoader for the whole wildcard requirement,</p><p>which would then get hit for every not-yet-resolved class/resource lookup.</p><p>Resulting in creating new DelegateLoader, and adding that to existing delegates -- before our wildcard "creator".</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>e.g.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>class</b></font> WildcardDelegateLoader <font color="navy"><b>extends</b></font> FilteredDelegateLoader
<font color="navy">{</font>
   ...
 
   <font color="navy"><b>protected</b></font> DelegateLoader resolve(String pckg)
   <font color="navy">{</font>
      Requirement requirement = <font color="navy"><b>new</b></font> PackageRequirement(pckg, range);
      WildcardRequirementDependencyItem item = <font color="navy"><b>new</b></font> WildcardRequirementDependencyItem(module, requirement, module.getClassLoaderState());
      <font color="navy"><b>if</b></font> (item.resolve(controller))
      <font color="navy">{</font>
         List<RequirementDependencyItem> items = module.getDependencies(); <font color="darkgreen">// should not be null, as this delegate was created from a requirement</font>
         items.add(item);
         module.addIDependOn(item);
        
         Module resolvedModule = item.getResolvedModule();
         <font color="navy"><b>if</b></font> (resolvedModule <font color="navy"><b>instanceof</b></font> ClassLoaderPolicyModule)
         <font color="navy">{</font>
            ClassLoaderPolicyModule clpm = (ClassLoaderPolicyModule) resolvedModule;
            DelegateLoader loader = clpm.getDelegateLoader(module, requirement);
            item.setLoader(loader);
 
            ClassLoaderPolicy policy = getPolicy();
            <font color="darkgreen">// TODO -- add new loader to policy's delegate</font>
 
            <font color="darkgreen">// pseudo-code -- ???</font>
            List<DelegateLoader> delegates = policy.getDelegates();
            delegates.add(0, loader); <font color="darkgreen">// make sure it's before this wildcard delegate</font>
         <font color="navy">}</font>
      <font color="navy">}</font>
      <font color="navy"><b>return</b></font> <font color="navy"><b>null</b></font>;
   <font color="navy">}</font>
 
   @Override
   <font color="navy"><b>protected</b></font> Class<?> doLoadClass(String className)
   <font color="navy">{</font>
      DelegateLoader loader = resolve(ClassLoaderUtils.getClassPackageName(className));
      <font color="navy"><b>return</b></font> loader != <font color="navy"><b>null</b></font> ? loader.loadClass(className) : <font color="navy"><b>null</b></font>;
   <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And I have no idea how to hack around this dynamic loader to policy's delegates addition.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Or I completely misunderstood your impl? :-)</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/547040#547040">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Microcontainer Development at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2115">Community</a></p>
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