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From Richard Eckart de Castilho <...@apache.org>
Subject Implications of the UimaContextHolder
Date Mon, 06 Feb 2017 11:11:44 GMT
Hi all,

triggered by changes in UIMA-5058, I have looked again at how the UimaContextHolder works
and is being used right now.

In particular, I think the following case is not uncommon but now potentially problematic:

// 1) instantiate reader
CollectionReader reader = UIMAFramework.produceCollectionReader(readerDesc, resMgr, null);

// 2) instantiate analysis engine
AnalysisEngine aae = UIMAFramework.produceAnalysisEngine(aaeDesc, resMgr, null);

// 3) create a CAS
CAS cas = CasCreationUtils.createCas(asList(reader.getMetaData(), aae.getMetaData()),
            null, resMgr);

// 4) inform the reader about the type system

// 5) iterate over the reader using the given CAS and process it using the AE

The potential problem in this setup is that 1) and 2) both call UimaContextHolder.setContext().

Do you see that as a problem?


-- Richard
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