[jboss-as7-dev] Exposing OSGi runtime bundle management through the Detyped API

[David Bosschaert]

On 29/09/2011 13:28, Thomas Diesler wrote:
> |I'd prefer an operation 'list-bundles' with every bundle being an 
> addressable resource. |

No sure I follow this completely...
So you have bundles as addressable resources:
/subsystem=osgi/bundle=0
/subsystem=osgi/bundle=1
/subsystem=osgi/bundle=2
etc...

and then you'd like an operation
/subsystem=osgi:list-bundles
?

Isn't that what you get when you call
/subsystem=osgi:read-children-names(child-type=bundle)
or simply in the CLI
ls bundle
?

> |The attributes you mention are fine for a start, however please have 
> a look at BUNDLE_TYPE 
> <http://www.osgi.org/javadoc/r4v42/org/osgi/jmx/framework/BundleStateMBean.html#BUNDLE_TYPE> 
> and check whether you want to support one or the other as well. The 
> list of supported attributes can always be expanded.
> |

Yeah I wanted to start small and add more later on, but thinking more 
about it, exposing the bundle's start level should probably go in the 
first round.

> |Strictly speaking the start-level is not a property of the framework, 
> but of the StartLevel service. It'd be better to model that service as 
> an addressable resource. In future there will probably be more services
>
> /subsystem=osgi/service=startlevel:write-attribute(name=startlevel,value=5)
> |

That depends on how you look at it :) up until core 4.2 it's exposed 
through the Start Level service. From core 4.3 start level is actually 
an API on the Framework (you need to adapt bundle 0 to get the start 
level API) so for the future it might actually be more consistent to 
represent this as a property of the framework. (BTW the Start Level 
services will still be supported for BW compatibility).

> |For consistency the bundle operations should be called start/stop |
> |
> ||/subsystem=osgi/bundle=1:start
> ||/subsystem=osgi/bundle=1:stop
> |

The reason why I suggested start-bundle and stop-bundle is that start 
and stop are highly generic and I was worried that in the future there 
might be global operations called start and stop. Hence I added the 
-bundle suffix.

> |
> Are you planning to support start options?
>
> |

Ultimately yes, but not in the initial cut. Most people don't use those 
AFAIK.

> |Glad you considered domain mode ;-)
>
> cheers
> -thomas
> |||
Thanks for the feedback!

David

> On 09/28/2011 05:57 PM, David Bosschaert wrote:
>> Hi all,
>>
>> I'm planning to add some runtime management via the Detyped API to the
>> OSGi subsystem. After getting some staring point input from Brian and
>> Thomas I wrote a page on how an initial implementation could look like.
>>
>> Any feedback appreciated:
>> http://community.jboss.org/wiki/OSGiRuntimeManagementUsingDetypedAPI
>>
>> Cheers,
>>
>> David
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>
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> Thomas Diesler
> JBoss OSGi Lead
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