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Message-ID: <4A81576E.6050400@gmail.com>
Date: Tue, 11 Aug 2009 13:35:10 +0200
From: =?ISO-8859-1?Q?J=F6rn_Kottmann?= <kottmann@gmail.com>
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To: uima-user@incubator.apache.org
Subject: Re: Are CasConsumers deprecated by AnalysisEngines?
References: 
 <DD073385-8CDE-4EDD-B9FF-632E1BF9D10E@tk.informatik.tu-darmstadt.de>
 <4A81545E.6090505@schor.com>
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Marshall Schor wrote:
> Richard Eckart de Castilho wrote:
>   
>> Hello everybody,
>>
>> recently the question of replacing all our CasConsumers with
>> AnalysisEngines comes up quite frequently and the potential myth that
>> CasCosumers should no longer be used and instead AnalysisEngines
>> should be preferred crops up every once in a while. I tried finding a
>> definitive information about this in the mailing list archives, but I
>> did not.
>>
>> In 2007 Adam Lally stated:
>>
>>     
>>> In recent versions of UIMA there is essentially no difference between
>>> an AnalysisEngine and a CasConsumer
>>>       
>> I think at least in CPEs it makes a difference, since with the first
>> CasConsumer the CPE supposed to be run in a single thread, so the
>> CasConsumer sees all the documents. The CPE, however, is afaik
>> deprecated and replaced by UIMA AS.
>>
>> If an AnalysisEngine has "allow multiple deployment" set to "false",
>> 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 is"
>> (minus inheriting from a different base class and changing the
>> descriptor type) by an AnalysisEngine that may not be deployed multiply?
>>     
>
> I think this is basically correct.  The one thing I'm not completely
> sure of because I haven't checked (:-) ) is whether calling something a
> Cas Consumer moves the component in the default flow to the end of the
> pipe line, in a CPE.  In UIMA-AS, it doesn't, I think..
>   
Is there a reason why Cas Consumer is not deprecated ?

The tutorial and dev guide suggest that it should not longer be used:

2.4.3:
"... We recommend for future work that users implement and use Analysis 
Engine components instead of CAS Consumers. ..."

J�rn

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