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Classloading and caching changes
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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/543110#543110">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote">"the classloader used is in the parent domain"<p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But this isn't always the case?<br/>Only for this piece:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">      <span style="color: darkgreen;">// Try the before attempt (e.g. from the parent)</span>
      Loader loader = <span style="color: navy;"><strong>null</strong></span>;
      <span style="color: navy;"><strong>if</strong></span> (findInParent)
         loader = findBeforeLoader(name);
      <span style="color: navy;"><strong>if</strong></span> (loader != <span style="color: navy;"><strong>null</strong></span>)
         <span style="color: navy;"><strong>return</strong></span> loader;
</code></pre>
<p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p>
<p>But this could be cached -- if the policy permits it?</p>
<p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p>
<pre class="jive-pre"><code class="jive-code jive-java">      <span style="color: darkgreen;">// Next use any requesting classloader, this will look at everything not just what it exports</span>
      <span style="color: navy;"><strong>if</strong></span> (classLoader != <span style="color: navy;"><strong>null</strong></span>)
      <span style="color: navy;">{</span>
         <span style="color: navy;"><strong>if</strong></span> (trace)
            log.trace(<span style="color: navy;"><strong>this</strong></span> + <span style="color: red;">" trying to load "</span> + name + <span style="color: red;">" from requesting "</span> + classLoader);
         <span style="color: navy;"><strong>if</strong></span> (classLoader.getResourceLocally(name) != <span style="color: navy;"><strong>null</strong></span>)
            <span style="color: navy;"><strong>return</strong></span> classLoader.getLoader();
      <span style="color: navy;">}</span>
</code></pre>
</blockquote><p>That's why it can't update the Cache in the place you suggested.<br/>For a classloader inside the domain it can globally cache, otherwise it can't.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>It should cache in the domain where the classloader lives.<br/>What needs changing is to check that cache according to the parent delegation<br/>rules outside the synchronization block.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>if (matchesParentBefore)<br/>  checkParentCache();<br/>checkOurCache();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The difficulty comes in that we would like to add<br/>if (matchesParentAfter)<br/>  checkParentCache();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But we can't because the next logical step is to see if we can load from our domain.<br/>This however would work:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>if (isBlackListedInOurDomain && matchesParentAfter)<br/>  checkParentCache();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>because we know we won't load it from our domain.</p></div>
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