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From Marshall Schor <...@schor.com>
Subject Re: Multithreading question
Date Mon, 12 Nov 2007 12:09:03 GMT
This may not be quite precise enough.  Your Annotators will be
instantiated multiple times,  so that a single *instance* of an
annotator will not be run on multiple threads at once.  So - if you have
non-static fields in your annotator, they do not need to be accessed
with threading in mind. But if you make use of "static" fields, there is
only one instance of these, so access to them must be thread-safe.

If your *application*  (not your annotator) is multi-threaded, it will
need to be thread-safe. You can find relevant information about this in
the tutorial and reference docs for UIMA (search for "thread").


Michael Baessler wrote:
> Benjamin Sznajder wrote:
>> Hi all,
>> I am interested in using multi-threading in UIMA.
>> My aim is that the flow runs several annotators in parallel.
>> One of my annotators is not thread-safe. My question is, then,
>> Does the UIMA parallelism ( setting "MultipleDeployment=true") requires
>> that annotators on which this flag is set, are thread-safe?
>> Regards,
>> Benjamin.
> Yes, your annotator have to be thread-safe when you want to run them
> multi-threaded.
> -- Michael

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