Le 1 sept. 2013 à 22:28, Richard S. Hall <[email protected]> a écrit :
> I'm pretty sure this isn't possible for resources, like it is for classes.
>
> The OSGi spec doesn't mandate the format of bundle resource URLs, which is
> what you would need if you wanted to determine from which bundle a looked up
> resource comes.
>
> Not sure about other frameworks, but this is fairly easy to determine from a
> resource URL in the Felix framework, since this host is the bundle id +
> revision id.
I can do an if(felix) in my code to optimize. In the long term can I rely on
this URL scheme ?
Nicolas
>
> -> richard
>
> On 9/1/13 11:31 , Nicolas Lalevée wrote:
>> Hi,
>>
>> Maybe my issue has already been addressed several time, so here is the
>> actual question: how can I get the bundle/classloader which *owns* the URL
>> which I looked up through classloader.getResource(file) ?
>>
>> If it's not clear, here is my context.
>>
>> I am experimenting a build system where some Ant build files and Ant task
>> would be managed like as OSGi bundles. So I can do a modularisation of build
>> files and jars of Ant Tasks.
>>
>> At some point a build file (within a bundle) will have to load some other
>> Ant script (through the bundle wiring). For that I simply get the
>> classloader of the current classloader and do a
>> classloader.getResource("/path/other/build.xml"). So far so good.
>> But when running that other build file, I would need its classloader to do
>> some other import of build.xml file. But I only have the resolved URL, not
>> the bundle which is containing the resolved script. Which java code, it's
>> simple, from the resolved class I can get its classloader. But I cannot do
>> that for a script which as been resolved as an URL.
>>
>> Here is what I have manage to do so far but I find it not pretty:
>>
>> URL buildUrl = currentClassLoader.getResource(buildFile);
>> ClassLoader buildClassLoader = null;
>> for (Bundle bundle : allBundles) {
>> BundleWiring wiring = bundle.adapt(BundleWiring.class);
>> int i = buildFile.lastIndexOf('/');
>> String path = buildFile.substring(0, i);
>> String name = buildFile.substring(i + 1);
>> List<URL> entries = wiring.findEntries(path, name, 0);
>> if (!entries.isEmpty() && containsUrls(entries, buildUrl)) {
>> buildClassLoader = wiring.getClassLoader();
>> break;
>> }
>> }
>> if (buildClassLoader == null) {
>> throw new RuntimeException("WTF! Unable to find the classloader of
>> the build file " + buildFile);
>> }
>>
>> It is working but it doesn't sound nice. Is there an API I didn't found
>> which allows to look for a resource and its bundle or classloader ? I would
>> prefer an OSGi API, but if it's a Felix one I don't mind.
>>
>> Nicolas
>>
>>
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