Re: OSGi talks at ApacheCon EU 2006

[Thor Heinrichs-Wolpert <th...@lunartek.com>]

Where can I see more on the OSGi / Dependency Injection?

It's something I need to resolve in my work so knowing what a good  
direction is would be helpful.  I've been looking at the Spring/OSGi  
stuff that cocoon is doing with some interest.

Cheers,
Thor HW

On 19-Apr-06, at 8:20 AM, Noel J. Bergman wrote:

>> I cannot help but feel a little bummed because Peter Kriens' OSGi
>> tutorial was not accepted
>
> Huh?  I show it as having been accepted, and tentatively (tutorials  
> are not
> actually "accepted" until they reach a critical enrollment point)  
> scheduled
> for Tuesday afternoon.
>
>> nor was BJ Hargrave's OSGi/Dependency Injection talk...both of which
>> would have been excellent.
>
> We have to reject something on the order of 75% of all submissions,  
> most of
> which would be excellent.  And we try to make sure that as many  
> projects as
> possible have some representation.  OSGi actually has quite a bit of
> coverage at the conference.
>
>> Are we going to receive some sort of official notice about this?
>
> The conference production company is supposed to send out notices.
>
> 	--- Noel
>
>

Re: OSGi talks at ApacheCon EU 2006

["Richard S. Hall" <he...@ungoverned.org>]

Thor Heinrichs-Wolpert wrote:
> Where can I see more on the OSGi / Dependency Injection?

Start by checking out the OSGi R4 Compendium spec for Declarative 
Services on the standard OSGi way of doing dependency injection. BJ 
Hargrave also gave a talk at the San Diego ApacheCon about Declarative 
Services, so that could give you some information too.

-> richard

> It's something I need to resolve in my work so knowing what a good 
> direction is would be helpful.  I've been looking at the Spring/OSGi 
> stuff that cocoon is doing with some interest.
>
> Cheers,
> Thor HW
>
> On 19-Apr-06, at 8:20 AM, Noel J. Bergman wrote:
>
>>> I cannot help but feel a little bummed because Peter Kriens' OSGi
>>> tutorial was not accepted
>>
>> Huh?  I show it as having been accepted, and tentatively (tutorials 
>> are not
>> actually "accepted" until they reach a critical enrollment point) 
>> scheduled
>> for Tuesday afternoon.
>>
>>> nor was BJ Hargrave's OSGi/Dependency Injection talk...both of which
>>> would have been excellent.
>>
>> We have to reject something on the order of 75% of all submissions, 
>> most of
>> which would be excellent.  And we try to make sure that as many 
>> projects as
>> possible have some representation.  OSGi actually has quite a bit of
>> coverage at the conference.
>>
>>> Are we going to receive some sort of official notice about this?
>>
>> The conference production company is supposed to send out notices.
>>
>>     --- Noel
>>
>>
>
>

Re: OSGi talks at ApacheCon EU 2006

[Daniel Fagerstrom <da...@nada.kth.se>]

Thor Heinrichs-Wolpert skrev:
> Where can I see more on the OSGi / Dependency Injection?
>
> It's something I need to resolve in my work so knowing what a good 
> direction is would be helpful.
I would recommend to use the OSGi declarative services without any 
Spring couplings. Considering that you can depend on such new and 
untested technology as the DS of course.
>   I've been looking at the Spring/OSGi stuff that cocoon is doing with 
> some interest.
We develop the Spring/OSGi stuff only because we need to support our 
legacy. If I where to start from scratch I wouldn't create such a 
complicated architecture and only use DS for all dependency injection needs.

If you need Spring/OSGi integration there is some ongoing work within 
the Spring community there is some code in their whiteboard (the CVS 
seem to be down ATM, so I can't provide any link).

The reason that we develop an own Spring/OSGi bridge in Cocoon is that I 
didn't know about the work at Spring when I started and also because we 
have the additional complication that our Spring container is extended 
to handle Avalon components.

Spring and OSGi has some impedance mismatch in component life cycle, and 
component concepts. So it is easier to get correct dynamic service 
dependency handling between bundles if you use DS alone.

                         --- o0o ---

For those interested in the technical details: The Cocoon/Spring bridge 
use one Spring factory for each bundle. We use the bean post processor 
hook in Spring for register all the Spring managed beans as services 
(this requires that all beans are created at the bean factory creation 
time, to make the beans available to the rest of the bundles). We also 
have a OSGi service/Spring bridge in each bundle that implements 
BeanFactory and that do a service lookup for each bean request. This 
makes it possible to get beans that are managed in other bundles.

The OSGi service/Spring bridge is used as parent factory for the bean 
factory, and make it thus possible to create components that get 
dependencies from other bundles injected.

                         --- o0o ---

All this is ongoing work, and I'm fairly certain about that there are 
further complexities that we haven't solved yet :/

/Daniel

Re: OSGi talks at ApacheCon EU 2006

[Marcel Offermans <ma...@luminis.nl>]

Hello Peter,

Peter Neubauer wrote:

> we have written a simple tutorial on what now is the Felix Dependency  
> Manager. I'm not sure our contributions have been incorporated  
> (Marcel, what is the status, and btw, we found a bug in the code).

I am still working on that, but with a big deadline and visits to 
JavaONE, NLJUG and ApacheCON in the upcoming months progress is a bit 
slow. Could you please report the bug to the Felix JIRA so I can look at it.

Greetings, Marcel

Re: OSGi talks at ApacheCon EU 2006

[Peter Neubauer <pe...@neubauer.se>]

Hi Thos,
we have written a simple tutorial on what now is the Felix Dependency  
Manager. I'm not sure our contributions have been incorporated  
(Marcel, what is the status, and btw, we found a bug in the code).

http://wiki.ops4j.org/dokuwiki/doku.php?id=pax:xenotron
Hope that helps to get an overview.

/peter

On May 4, 2006, at 2:07 AM, Thor Heinrichs-Wolpert wrote:

> Where can I see more on the OSGi / Dependency Injection?
>
> It's something I need to resolve in my work so knowing what a good  
> direction is would be helpful.  I've been looking at the Spring/ 
> OSGi stuff that cocoon is doing with some interest.
>
> Cheers,
> Thor HW
>
> On 19-Apr-06, at 8:20 AM, Noel J. Bergman wrote:
>
>>> I cannot help but feel a little bummed because Peter Kriens' OSGi
>>> tutorial was not accepted
>>
>> Huh?  I show it as having been accepted, and tentatively  
>> (tutorials are not
>> actually "accepted" until they reach a critical enrollment point)  
>> scheduled
>> for Tuesday afternoon.
>>
>>> nor was BJ Hargrave's OSGi/Dependency Injection talk...both of which
>>> would have been excellent.
>>
>> We have to reject something on the order of 75% of all  
>> submissions, most of
>> which would be excellent.  And we try to make sure that as many  
>> projects as
>> possible have some representation.  OSGi actually has quite a bit of
>> coverage at the conference.
>>
>>> Are we going to receive some sort of official notice about this?
>>
>> The conference production company is supposed to send out notices.
>>
>> 	--- Noel
>>
>>
>
>
>