[kepler-dev] What ever came of the OSGI initiative?

[David Welker]

I don't agree with this point about OSGi, but it is sort of a moot  
point.


On May 10, 2011, at 2:31 PM, Aaron Schultz wrote:

>
> Hi Frank,
>
> Generally, I think most everyone working on Kepler eventually  
> realized that an OSGi-ified Kepler/Ptolemy was the best possible end  
> result for modularization of the system.  Unfortunately that  
> realization happened too late and the feeling was that we would not  
> be able to achieve that goal with the existing resources in a  
> consistent and backward compatible manner.  The system that was  
> produced meets most of the goals of the original Kepler Core proposal.
>
> Christopher!  Glad to hear you have some funding to continue OSGi  
> work.  Let me know if any more becomes available  :)   I have no  
> doubt we could find a good technical solution within the OSGi  
> framework that maintains an "open system".  Reflection is such a  
> nasty business...
>
> Aaron Schultz
>
>
> On 5/10/2011 10:46 AM, Christopher Brooks wrote:
>> Hi Frank,
>> My understanding is that some research was done and it was
>> found not to work out for Kepler.
>>
>> Try using google to search for
>> site:http://lists.nceas.ucsb.edu osgi
>>
>> Some good things did come out of that effort though.  One thing
>> is that I cleaned up a bunch of unneeded dependencies in the
>> ptolemy tree.
>>
>> My current understanding is that a big issue is with how MoMLParser
>> instantiates actor classes by using reflection.  Apparently there
>> is an issue with OSGi where OSGi needs to know in advance what
>> classes are in the classpath.  The problem is that MoMLParser does  
>> not
>> know in advance what classes will be instantiated.  I don't find  
>> closed
>> systems to be that compelling for research.  A closed system is  
>> useful
>> for deployment. Here, closed means that only a predefined set of  
>> classes
>> will *ever* be loaded.
>>
>> I'm a little foggy on the details, but I believe Eclipse has a buddy
>> annotation that could help.
>>
>> In other news, I have funding to do some of the OSGi work, but
>> it is not scheduled until next year.  I think I blocked out about
>> 6 months at 30% time.
>>
>> In other, other news, I noticed that Taverna is in the process
>> of releasing an OSGi, see
>> http://www.mygrid.org.uk/dev/issues/browse/TOSGI
>>
>> _Christopher
>>
>> On 5/9/11 6:34 PM, Frank White wrote:
>>> Hello All:
>>>
>>> What ever came of the Kepler OSGI initiative? I see there were some
>>> OSGI investigations back in 2008, but I can't seem to find  
>>> anything that
>>> documents a final decision. Appreciate any insights you might  
>>> provide.
>>> Thanks!
>>> Frank
>>>
>>
>
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