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From Adam Lally <ala...@alum.rpi.edu>
Subject Re: Passing java references to a UIMAJ component
Date Tue, 08 Sep 2009 13:44:40 GMT
On Tue, Sep 8, 2009 at 6:49 AM, Jörn Kottmann<kottmann@gmail.com> wrote:
> Marshall Schor wrote:
>>
>> Fabio Mancinelli wrote:
>>
>>>
>>> Hi everybody,
>>>
>>> I have a quick question about UIMAJ component initialization.
>>>
>>> What I would like to do is to pass a Java reference to an object that
>>> will be used by the "business logic" of a collection reader in the
>>> context of a CPE. Since I cannot control the instantiation of the
>>> collection reader, I was wondering if there is a quick and clean way
>>> to pass that object reference or if this is not impossible at all
>>> (like I am suspecting).
>>>
>>
>> There is no clean way to do this in general.  This is because the
>> components in general could be running in other contexts, for instance,
>> in a remote machine, not the same JVM, etc.
>>
>> There is a way to share Java objects among annotators running in the
>> same machine, using external resources; see
>>
>> http://incubator.apache.org/uima/downloads/releaseDocs/2.2.2-incubating/docs/html/tutorials_and_users_guides/tutorials_and_users_guides.html#ugr.tug.aae.accessing_external_resource_files
>>
>> While that specifically addresses creating a Java object and then
>> "loading" it from an external file, the loading part is optional.
>>
>
> What must be done to make the loading part optional ?
>
> If a resource is described without the fileResourceSpecifier element,
> then the framework throws a NullPointerException.
>
> For example:
> <externalResourceDependency>
>  <key>searchQueryProvider</key>
>  <interfaceName>org.apache.uima.lucas.SearchQueryProvider</interfaceName>
> </externalResourceDependency>
> ...
> <externalResource>
>  <name>SampleSearchQueryProvider</name>
>  <implementationName>org.apache.uima.lucas.SampleSearchQueryProvider
>  </implementationName>
> </externalResource>
>


Instead of a fileResourceSpecifier you can use a customResourceSpecifier. See:
http://incubator.apache.org/uima/downloads/releaseDocs/2.2.2-incubating/docs/html/references/references.html#ugr.ref.xml.component_descriptor.custom_resource_specifiers

-Adam

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