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Subject: Re: CAS Multiplier usage in UIMAfit
From: Richard Eckart de Castilho <rec@apache.org>
In-Reply-To: <20140416092736.GW6156@machine.or.cz>
Date: Wed, 16 Apr 2014 11:39:44 +0200
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Message-Id: <055D8055-D512-4EC6-B92C-9E7DBC146379@apache.org>
References: <0415d209e8661a1e057a0632512d917f@crydee.eu>
 <20140416092736.GW6156@machine.or.cz>
To: user@uima.apache.org

Hum, I had totally forgotten about this code by Philipp W.

But anyway, I recently looked into the problem as well [1]
and I wasn't particularly happy because whatever I could=20
come up with required client code to call CAS.release()
explicitly - at least when trying to solve the problem
in JCasIterable.

Addressing that only on the level of SimplePipeline
may be more straight-forward. I'll look into that as well.

Btw. feel free to comment on the issue if you have further
insight or suggestions (or patches ;) ).

Cheers,

-- Richard

[1] https://issues.apache.org/jira/browse/UIMA-3470

On 16.04.2014, at 11:27, Petr Baudis <pasky@ucw.cz> wrote:

>  Hi!
>=20
> On Wed, Apr 16, 2014 at 03:26:54PM +0900, Hugo Mougard wrote:
>> I'm trying to use a multiplier to discard some CASes based on some
>> annotation. It currently doesn't work (the CASes are not discarded). =
I
>> also noticed several tickets opened on the suject of multipliers and
>> am therefore not sure if it's currently possible to use them in
>> UIMAfit.
>=20
>  Perhaps a better solution exists meanwhile, but some time ago,
> Philipp W suggested on this mailing list a SimplePipeline replacement
> that can deal with CAS multipliers:
>=20
> 	=
https://groups.google.com/forum/#!topic/uimafit-users/yA0w2Q8tGNE
>=20
> I had to wrap it up in an actual class and fix it for Aggregate =
Engines,
> my version is at:
>=20
> 	=
https://github.com/brmson/yodaqa/blob/master/src/main/java/cz/brmlab/yodaq=
a/flow/MultiCASPipeline.java
>=20
> You just use it in the same way as you'd use SimplePipeline then, =
e.g.:
>=20
> 	=
https://github.com/brmson/yodaqa/blob/9e12a80c/src/main/java/cz/brmlab/yod=
aqa/YodaQAApp.java
>=20
>=20
>  P.S.: I think ideally, to enable better scale-out and for consistency
> if you are using other Aggregate Engines anyway, you would probably
> create a single aggregate engine for your pipeline with the proper =
flow
> controller setup within, setting FlowController's =
ActionForIntermediateSegments
> to "drop".  In XML CPE descriptor you'd do that like this:
>=20
> 	=
https://github.com/brmson/yodaqa/blob/bad64d5c/src/main/resources/cz/brmla=
b/yodaqa/pipeline/YodaQA.xml
>=20
> If you come up with a way to do that in UIMAfit, I will be glad if =
you'd
> share a working code snippet.
>=20
> 				Petr "Pasky" Baudis