Adam Lally wrote:
On Tue, Sep 8, 2009 at 6:49 AM, Jörn Kottmann<[email protected]> 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
The externalResource definition now looks like this
<externalResource>
<name>SampleSearchQueryProvider</name>
<customResourceSpecifier>
<resourceClassName>org.apache.uima.lucas.SampleSearchQueryProvider</resourceClassName>
</customResourceSpecifier>
</externalResource>
and the SampleSearchQueryProvider instance can be accessed by an
AnalysisEngine.
Thanks for your help,
Jörn
