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From "Richard S. Hall" <he...@ungoverned.org>
Subject Re: OSGi, versioning and native code
Date Wed, 04 Jan 2006 18:41:02 GMT
Tim Ellison wrote:
>> The OSGi framework must process the
>> Bundle-NativeCode header to make the selected libraries available at some 
>> bundle unique location so that if each bundle contains libfoo.so, the 
>> absolute path for each bundle's libfoo.so is unique.
>>     
>
> Not only path, but also filename I would assume, right?
> On windows a call to LoadLibrary with \\foo\mylib.dll followed by a call
> to LoadLibrary with \\bar\mylib.dll will simply result in reloading
> \\foo\mylib.dll.  So will the framework mange the filename too to allow
> for multiple versions of my bundle's natives to be active concurrently?
>   

Are you sure? I don't think this is the case, I think it is the complete 
path. I did testing on this before for Oscar and I only had to change 
the path, unless I missed something.

> As a bonus question:  Is there any support for native to native calls?
>   

No.

> Assume I have a bundle that only contains library files, with a manifest
> to get the platform deploy right, versioning etc..  As I've now learnt,
> the framework will put the right library into some unique location that
> I'm not privy to; so I assume I can *only* load it via the framework
> (System.loadLibrary()) by calling back into java :-( , and then I need
> to get a handle to that library instance so I can GetProcAddress/dlsym a
> function in that library, and of course there is no API way to get that
> handle :-( .  Is that right,  am I out of luck for native->native calls
> between bundles?
>   

Yes, you are out of luck.


-> richard


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