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From: Richard Eckart de Castilho <eckart@ukp.informatik.tu-darmstadt.de>
To: "<user@uima.apache.org>" <user@uima.apache.org>
Subject: Re: Dependency injection support in UIMA
Thread-Topic: Dependency injection support in UIMA
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Date: Wed, 21 Nov 2012 18:25:51 +0000
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Hi,
>   Thank you for your anwers. Regarding the SharedResourceObject approach
> in the JavaDoc I didn't find any reference about how many instances will =
be
> created when you have many Annotators using the same resource. I would sa=
y
> that that will be one SharedResouce per instance Annotator.

The ResourceManager creates one instance per resource per UIMA context.

>  1.So suppose that you have AnnotatorX  and AnnotatorY using the
> SharedResourceObject collocated (same JVM) how many instances of
> SharedResourceObject do we have?

Depends how you deploy your pipelines. Assuming that run a single CPE
(or something the likes) per JVM, there will be a single instance. Each
CPE run creates an UIMA context internally. I don't know how UIMA-AS handle=
s
that. If you run your pipelines with uimaFIT's SimplePipeline, one instance
per call run runPipeline() is created.

>   2.Also, if the AnnotatorX is a remote EA that is using the
> SharedResourceObject with a scale out factor of 3, how many instances of
> SharedResourceObject  will be created?

As the name says, the instance is shared - so one instance.

>  What I'm afraid, that given the ApplicationContext on some point we have
> to destroy it. As far as I know this can be achieve in the destroy method
> of the annotator. But if we have a single SharedResourceObject shared amo=
ng
> annotators probably will be a mess to destroy the context from each of th=
e
> instances.

It seems that UIMA does currently not support a full lifecycle management
for external resources. It can create the, but they are not notified in any=
 way
when the UIMA context/ResourceManager goes out of business.

You could implement a check-out/return mechanism: increment a counter varia=
ble
in the resource every time an analysis engine calls a certain method on the
resource. In the destroy() method of the analysis engine, call another meth=
od
to decrement the counter. If the counter reaches 0 at the end of the=20
decrement method, call your resource's destroy() logic.

>  I would like to ask you if this code is proper solution for our case
>=20
> MyCasConsumer {
>=20
>   private ApplicationContext springContext;
>=20
>  void  initialize() {
>   springContext =3D new ClassPathXmlApplicationContext("spring-context.xm=
l");
>  }
>=20
>  void destroy() {
>   springContext.close();
>  }
> }

I wouldn't call a shared resource "CasConsumer". Also, CasConsumer's normal=
ly
don't scale because they have the MULTIPLE_DEPLOYMENT_ALLOWED_DEFAULT flag =
set
to "false".

-- Richard

--=20
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Richard Eckart de Castilho
Technical Lead
Ubiquitous Knowledge Processing Lab (UKP-TUD)=20
FB 20 Computer Science Department     =20
Technische Universit=E4t Darmstadt=20
Hochschulstr. 10, D-64289 Darmstadt, Germany=20
phone [+49] (0)6151 16-7477, fax -5455, room S2/02/B117
eckart@ukp.informatik.tu-darmstadt.de=20
www.ukp.tu-darmstadt.de=20
Web Research at TU Darmstadt (WeRC) www.werc.tu-darmstadt.de
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