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From: Torsten Zesch <zesch@tk.informatik.tu-darmstadt.de>
To: "user@uima.apache.org" <user@uima.apache.org>
Date: Fri, 9 Jul 2010 11:10:52 +0200
Subject: Process an aggregate with CAS multiplier and merger
Thread-Topic: Process an aggregate with CAS multiplier and merger
Thread-Index: AcsfRqE9Eg4q6tO0RAyiP0tXwzU3xg==
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Hi,

I have a situation in which I want to split a document into several CASes, =
do some processing, and then merge the results back into a single result CA=
S.

I implemented a CAS multiplier and a CAS merger that I put into an aggregat=
e with a FixedFlow, setting ActionAfterCasMultiplier to "drop" and setting =
outputsNewCASes to "true" for the aggregate.
This should drop the source CAS and let the merged CAS be output by the agg=
regate.

Now, if I run that aggregate in an CPE and put the consumer behind the aggr=
egate,=20
=3D> Reader + Aggregate[Multiply-Process-Merge] + Consumer
the consumer only sees the source CAS.

However, if I put the consumer inside the Aggregate,
=3D> Reader + Aggregate[Multiply-Process-Merge-Consumer]
the output is correct.
This means the mergedCAS is correctly created, but it is not available afte=
r the aggregate.

Do I need to always put everything inside one big aggregate, or is there so=
me way to also run pipelines like=20
=3D> Reader + Process + Aggregate[Multiply-Process-Merge] + Process + Consu=
mer

Thanks,
Torsten