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From Tommaso Teofili <tommaso.teof...@gmail.com>
Subject Re: UIMA module thoughts (and refactoring)
Date Thu, 08 Sep 2011 10:00:40 GMT
I've updated the website with some basic documentation about Clerezza-UIMA.
See http://incubator.apache.org/clerezza/clerezza-uima
I'm writing also a small getting-started for devs.
Cheers,
Tommaso

2011/9/2 Reto Bachmann-Gmür <me@farewellutopia.com>

> I don't mind. It would be great if a mini howto (with a list of bundle-uri
> for each feature) could be attached.
>
> Cheers,
> Reto
> On Sep 2, 2011 9:05 AM, "Tommaso Teofili" <tommaso.teofili@gmail.com>
> wrote:
> > If no one objects, I plan to commit the solution I proposed above by the
> end
> > of the day so that we can start from there for the first release and
> > eventually change/better things along time.
> > Cheers,
> > Tommaso
> >
> > 2011/8/31 Tommaso Teofili <tommaso.teofili@gmail.com>
> >
> >> the dynamic-imports way was taken in consideration when talking with
> other
> >> UIMA mates, but I haven't inspected that possibility yet.
> >> Thanks Reto.
> >> Cheers,
> >> Tommaso
> >>
> >>
> >> 2011/8/31 Reto Bachmann-Gmür <me@farewellutopia.com>
> >>
> >>> Hi Tommaso
> >>>
> >>> Without knowing about the details I'm wondering if this extension
> >>> class loader defined when instantiating the UIMA framework cannot be
> >>> the Bundle-Class-Loader with the Bundle having a dynamic-import
> >>> directive.
> >>>
> >>> I'm very much looking forward to the 'Getting started with Clerezza
> >>> and UIMA' page :)
> >>>
> >>> Cheers,
> >>> Reto
> >>>
> >>> On Wed, Aug 31, 2011 at 4:48 PM, Tommaso Teofili
> >>> <tommaso.teofili@gmail.com> wrote:
> >>> > Hi all,
> >>> > the UIMA Addons 2.3.1 release happened on August 29th [1], this
> release
> >>> > didn't include the OSGi packaging for the annotators since the UIMA
> >>> > community wants to provide full support to OSGi in the future while
> the
> >>> > addons OSGi packaging allowed only some basic use cases to be
> executed.
> >>> >
> >>> > So far the bad news, the good news is that we can now include UIMA
> >>> Addons
> >>> > artifacts in our modules and that there is already a solution to face
> >>> the
> >>> > possible issues with class loading within a framework which is not
> fully
> >>> > OSGi compliant.
> >>> >
> >>> > The UIMAFramework class creates an AnalysisEngines given its (XML)
> >>> > descriptor that contains the FQN of the annotator class which is then
> >>> > instantiated via Class.forName().
> >>> > As far as I've experienced this is not good when working within OSGi
> >>> > containers as each bundle uses a separate ClassLoader so, for
> example,
> >>> the
> >>> > ClassLoader of the uima.utils bundle cannot see the
> ClerezzaCASConsumer
> >>> > class in uima.casconsumer module by default.
> >>> > Luckily UIMA provides the possibility of defining an extension
> >>> ClassLoader
> >>> > when instantiating the framework.
> >>> > So the idea is to define an ExtensionClassLoader which registers the
> >>> > ClassLoaders of UIMA classes implementing AnalysisComponent interface
> >>> (that
> >>> > is the interface for Annotators and CAS Consumers) and use it within
> the
> >>> > creation of each AnalysisEngine.
> >>> > Each bundle which has annotator classes can automatically register
> its
> >>> > classes (in the ExtensionClassLoader) using an OSGi Activator (a
> >>> > UIMABundleActivator in the maven-bundle-plugin configuration) which
> is
> >>> > responsible for this task.
> >>> >
> >>> > Obviously in the future releases of UIMA with full OSGi support the
> >>> above
> >>> > constraints could be safely removed.
> >>> >
> >>> > So my idea is to apply the above changes in order to allow easy
> deploy
> >>> of
> >>> > custom UIMA pipelines within Clerezza. After that I think a brief
> >>> 'Getting
> >>> > started with Clerezza and UIMA' page would be useful.
> >>> > Looking forward to your feedback.
> >>> > Cheers,
> >>> > Tommaso
> >>> >
> >>> > [1] : http://uima.apache.org/downloads.cgi
> >>> >
> >>>
> >>
> >>
>

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