Le 05/04/2013 11:15, Alexander Kriegisch a écrit :
> Check out
> http://www.eclipse.org/aspectj/doc/next/weaver-api/org/aspectj/weaver/loadtime/WeavingURLClassLoader.html.
>
> Here is a little old code snippet I found in one of my projects when I
> implemented a plug-in concept in which I had the aspect code in my main
> project, but wanted to advise plugin JARs which were loaded on demand. Feel
> free to modify it according to your needs:
>
> private void loadPlugin(String pluginJar, String pluginClassName)
> throws Exception {
> echo("Trying to load plugin JAR " + pluginJar);
> ClassLoader loader =
> Thread.currentThread().getContextClassLoader();
> WeavingURLClassLoader weaver = new WeavingURLClassLoader(
> new URL[] { new File(pluginJar).toURI().toURL() },
> new URL[] { loader.getResource(".") },
> loader
> );
> Class<?> pluginClass = weaver.loadClass(pluginClassName);
> Plugin plugin = (Plugin) pluginClass.newInstance();
> plugin.init(this);
> plugins.add(plugin);
> echo("Successfully loaded and initialised plugin '" +
> plugin.getName() + "'");
> }
Hi, and thanks for the answer.
But i had already seen this code and it doesn't fits our needs
In fact:
- two annotated aspects are present in the project, but not in separate jars
- aspect can't dynamically added at runtime depending on user configuration
(cache, log, time aspects).
I succeeded tweaking some portion of the code and using ugly introspective
code to bypass aspectj final or private modifier (aspectj uses a little bit of
defensive code).
The code currently looks like:
AspectJUrlClassLoader loader = new AspectJUrlClassLoader(urls, parentLoader);
thread.setContextClassLoader(loader);
if (parameters.getUseTrace()) {
loader.deploy(TraceAspect.class);
}
if (parameters.getUseCache()) {
loader.deploy(CacheAspect.class);
}
if (parameters.getUseTime()) {
loader.deploy(TimeAspect.class);
}
loader.prepareForWeave();
thread.start();
Then every class loaded from this new class loader is automatically weaved
if needed depending of registered aspects.
I have committed my current code here:
http://forge.codelutin.com/projects/isis-fish/repository/revisions/3822/show/branches/4.0.1/src/main/java/fr/ifremer/isisfish/aspect
Is it an approach that could be introduced into aspectj ?
--
Éric Chatellier - Code Lutin
Tel: 02.40.50.29.28 - http://www.codelutin.com
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