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From: Richard Eckart de Castilho <eckartde@tk.informatik.tu-darmstadt.de>
To: uima-user@incubator.apache.org
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Subject: Are CasConsumers deprecated by AnalysisEngines?
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Date: Mon, 10 Aug 2009 21:52:59 +0200

Hello everybody,

recently the question of replacing all our CasConsumers with =20
AnalysisEngines comes up quite frequently and the potential myth that =20=

CasCosumers should no longer be used and instead AnalysisEngines =20
should be preferred crops up every once in a while. I tried finding a =20=

definitive information about this in the mailing list archives, but I =20=

did not.

In 2007 Adam Lally stated:

> In recent versions of UIMA there is essentially no difference =20
> between an AnalysisEngine and a CasConsumer

I think at least in CPEs it makes a difference, since with the first =20
CasConsumer the CPE supposed to be run in a single thread, so the =20
CasConsumer sees all the documents. The CPE, however, is afaik =20
deprecated and replaced by UIMA AS.

If an AnalysisEngine has "allow multiple deployment" set to "false", =20
that should have the same affect within a CPE or within UIMA AS.

So the questions are:

- Is there any reason why CasConsumers are still required?

- Is there any reason that a CasConsumer cannot be replaced "as =20
is" (minus inheriting from a different base class and changing the =20
descriptor type) by an AnalysisEngine that may not be deployed multiply?

Best regards,

Richard Eckart de Castilho

--=20
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Richard Eckart de Castilho
Software Engineer
Ubiquitous Knowledge Processing Lab
FB 20 Computer Science Department
Technische Universit=E4t Darmstadt
Hochschulstr. 10, D-64289 Darmstadt, Germany
phone +49 (6151) 16 - 6218, fax -5455, room S2/02/E225
eckartde@tk.informatik.tu-darmstadt.de
www.ukp.tu-darmstadt.de
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