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From Rick McGuire <>
Subject Re: OSGI progress
Date Wed, 23 Sep 2009 10:35:32 GMT
David Jencks wrote:
> On Sep 22, 2009, at 10:50 PM, Ivan wrote:
>> After reading some code changes of the geronimo-kenel in the sanbox, 
>> I found that we keep the Geronimo kenel as an OSGI service, and each 
>> Configuration ( or a bundle) will search it and start the 
>> configuration as we do in the past while starting. 
> There's a difference in lifecycles between osgi bundles and geronimo 
> configurations.
> bundles can be installed, in which case the classes are not available, 
> or started, in which case the classes are all available and the bundle 
> activator has been started.  AFAICT there is no other built in 
> "no-really-start-it" state beyond "started".  There might be more 
> less-started states I'm not aware of.
The extender model sort or introduces an additional state (or at least 
the Blueprint extender does).  After STARTED state, the extender kicks 
in and processes metadata in the bundle and performs additional 
actions.  The completion point is when the BlueprintContainer service is 
published to the service registry.  At that point, the bundle state is 
"complete".  Something similar might make sense for a configuration, 
where a "ConfigurationContainer" service is published to the registry 
that would allow additional configuration operations to be performed. 
> Geronimo:
> A Configuration is a gbean.  You can't get much usefaul data out of it 
> until its started.  Once it is started the classes are available and 
> you can find out what services (gbeans) are in the configuration and 
> look at their attributes.  There's a further state of "all gbeans 
> started".  The configuration manager treats these states as "loaded" 
> and "started"
Again, this maps fairly well to the model used by Blueprint extender.  
The Configuration gbean could be published to the registry once it 
reaches the "all gbeans started" state. 

> So far it seems to work to do something similar in the osgi 
> environment but it doesn't really fit very well yet.  I'm not sure 
> where we will end up with this.
>> I have a feeling that, if we do that, Geronimo is still a part of 
>> OSGI env, could we make the Geronimo is an OSGI env?
> I don't understand what you are asking here.  In the sandbox, geronimo 
> plugins are running in an osgi enviroment, and all the classes are 
> loaded from osgi bundles.  Could you explain more what you are asking 
> about?
>> Could we publish GBeans as OSGI service via a ConfigurationActivator, 
>> or though a GBean-OSGI adapter ?
> I'm pretty sure we could, but I'd like to get more stuff working 
> before we decide if its a good idea.  IIUC blueprint doesn't publish 
> every blueprint bean as an osgi service, but only ones you configure 
> to be published.  I suspect we may want to, similarly, only publish 
> some gbeans as osgi services.
Your understanding is correct.  Only the explicitly identified beans are 
published as services.  I suspect this would likely make sense within a 
configuration context as well.

> My current approach is to try to modify the existing geronimo 
> architecture relatively little where possible to get it to run in 
> osgi, respecting osgi architecture.  So, I am trying to get stuff 
> working with the kernel as an osgi service, get the deployers working, 
> etc etc.  I think after we have done this we will have a much better 
> idea what other work we want to try.  For instance, we might not need 
> a kernel at all: possibly gbeans can just be osgi services with  a few 
> extra attributes.
> thanks
> david jencks
>> Thanks !
>> 2009/9/22 Rex Wang < <>>
>>     Yes! hope for detail sharing :-)
>>     -Rex
>>     2009/9/22 Jack Cai <
>>     <>>
>>         David, that's exciting work!
>>         It'll be great if you can share some more details. There are
>>         a few puzzles that flow around my mind -
>>          * Are we just taking OSGi framework in as another plug-in to
>>         let it host OSGi applications? Or, vice-versa, we are
>>         converting Geronimo into an OSGi application? 
>>          * If the latter case, will GBean go away?
>>          * If yes, how much code changes are required? I'd say a lot ...
>>         -Jack
>>         On Tue, Sep 22, 2009 at 8:25 AM, David Jencks
>>         < <>> wrote:
>>             Over the weekend I got my sandbox osgi framework to build
>>             and generate all the plugins as osgi bundles.  This
>>             involves running some of the geronimo server on
>>             osgi/felix inside maven.  The dependency management
>>             system seems to work OK at least for starting bundles.  I
>>             also started doing a little bit of code cleanup.
>>             I think the next step will be to get the framework server
>>             running in standalone karaf or felix.  Hopefully this
>>             will be no harder than getting it running in embedded
>>             felix in maven.
>>             thanks
>>             david jencks
>> -- 
>> Ivan

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