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<p style="margin: 10px 0 0 0; margin-top: 0">enable any module in either the "already enabled" set (if they still exist in the upgraded plugin) and in the enable-after-install set from the new version</p>
</blockquote> <p style="margin: 10px 0 0 0">This is actually quite interesting - and it gets oh, so confusing.</p>
<ul>
<li>Prior to any uninstall, get a list of all module <b>names</b> (not Module instances) which are enabled. Get this list from the "plugins already installed" classpath.</li>
<li>After the new IdP has been installed built <b>another</b> ClasspathLoader consisting of the "now" contents of <tt>dist/plugin-webapp/WEB-INF/lib</tt> (that is to say the new plugin <b>and</b> the old plugins minus the uninstalled one)</li>
<li>Lookup the modules by name on this module list and re-enable them. This operation is <b>not</b> rolled back because the modules were already enabled so there is no state to unroll to.</li>
<li>The new classpath loader can be closed as soon as this is done (or fails)</li>
<li><b>Then</b> ** with the "just installed" classpath still unclosed (to allow rollback) enable any modules on on the plugin supplied list which are not already enabled. This <b>is</b> rolled back.</li>
</ul> <p style="margin: 10px 0 0 0">Does that make sense?</p> <p style="margin: 10px 0 0 0">An alterative is to look up the names of the currently enabled modules in the "about to be installed" classpath loader. This won't save much time (since all the non plugin modules will be listed and thus re-enabled) but it does stop all the faffing around with a third classpath loader. Extra cuteness marks for looking up the modules on the default classpath loader (which , for the plugin command means <tt>dist\webapp\WEB-INF\lib* and edit-webapp\WEB-INF\lib*</tt> )</p> </td>
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