ServiceLoader?

[Benedikt Ritter <br...@apache.org>]

Hey,

with the strict separation between RDF interfaces and implementations, I
wonder if if would make sense to make it possible to look up
implementations using the ServiceLoader [1]. As far as a know, all we would
have to do, is to add a file to the META-INF folder of the simple
implementation package.

br,
Benedikt

[1] http://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html

-- 
http://people.apache.org/~britter/
http://www.systemoutprintln.de/
http://twitter.com/BenediktRitter
http://github.com/britter

Re: ServiceLoader?

[Stian Soiland-Reyes <st...@apache.org>]

I have used ServiceLoader together with OSGi. Basically you will have to
duplicate the discovery with OSGi services as each OSGi classloader won't
see the META-INF/services file. There is however no conflict with
supporting both approaches.

What I did was to have a bean property set to null, and through OSGi inject
the list of service instances in the setter, while the getter would fall
back to a ServiceLoader if it was still null.

But the relevance for Commons RDF is perhaps of importance here..I have
used it where I wanted many services (e.g. multiple parsers for different
formats), but in C-RDF the only candidate I can see is RDFTermFactory.

I think we can easily let simple/ have the appropriate META-INF file for
this, but not to instantiate our own service loader from api/, just
document this as one possible discovery mechanism.

Unlike say DOM API implementations I can imagine many scenarios where a
single factory instance per code implementation is NOT the best route, e.g.
Jena might want to have one factory per TDB storage.
On 30 Apr 2015 07:35, "Sergio Fernández" <wi...@apache.org> wrote:

> Hi Benedikt
>
> so far we've been focused on the api, so we never discussed such aspects
> about implementations, but now it's the perfect timing.
>
> We extensively use ServiceLoader in both Sesame and Marmotta, and I'd like
> to use here too. I'm aware of some concerns from the OSGi gang. So I'm
> happy to listen more opinions.
>
> I've just created COMMONSRDF-20 to handle this issue.
>
> Thanks Benedikt!
>
> Cheers,
>
>
>
> On Wed, Apr 29, 2015 at 9:28 AM, Benedikt Ritter <br...@apache.org>
> wrote:
>
> > Hey,
> >
> > with the strict separation between RDF interfaces and implementations, I
> > wonder if if would make sense to make it possible to look up
> > implementations using the ServiceLoader [1]. As far as a know, all we
> would
> > have to do, is to add a file to the META-INF folder of the simple
> > implementation package.
> >
> > br,
> > Benedikt
> >
> > [1]
> http://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html
> >
> > --
> > http://people.apache.org/~britter/
> > http://www.systemoutprintln.de/
> > http://twitter.com/BenediktRitter
> > http://github.com/britter
> >
>
>
>
> --
> Sergio Fernández
> Partner Technology Manager
> Redlink GmbH
> m: +43 6602747925
> e: sergio.fernandez@redlink.co
> w: http://redlink.co
>

Re: ServiceLoader?

[Sergio Fernández <wi...@apache.org>]

Hi Benedikt

so far we've been focused on the api, so we never discussed such aspects
about implementations, but now it's the perfect timing.

We extensively use ServiceLoader in both Sesame and Marmotta, and I'd like
to use here too. I'm aware of some concerns from the OSGi gang. So I'm
happy to listen more opinions.

I've just created COMMONSRDF-20 to handle this issue.

Thanks Benedikt!

Cheers,



On Wed, Apr 29, 2015 at 9:28 AM, Benedikt Ritter <br...@apache.org> wrote:

> Hey,
>
> with the strict separation between RDF interfaces and implementations, I
> wonder if if would make sense to make it possible to look up
> implementations using the ServiceLoader [1]. As far as a know, all we would
> have to do, is to add a file to the META-INF folder of the simple
> implementation package.
>
> br,
> Benedikt
>
> [1] http://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html
>
> --
> http://people.apache.org/~britter/
> http://www.systemoutprintln.de/
> http://twitter.com/BenediktRitter
> http://github.com/britter
>



-- 
Sergio Fernández
Partner Technology Manager
Redlink GmbH
m: +43 6602747925
e: sergio.fernandez@redlink.co
w: http://redlink.co