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https://issues.apache.org/jira/browse/STANBOL-234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rupert Westenthaler resolved STANBOL-234.
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Resolution: Fixed
Feature added with revision 1139429
see http://svn.apache.org/viewvc?rev=1139429&view=rev for details
> Use Bundle Extender Pattern to allow Bundles to expose Resource to the
> DataFileProvider
> ---------------------------------------------------------------------------------------
>
> Key: STANBOL-234
> URL: https://issues.apache.org/jira/browse/STANBOL-234
> Project: Stanbol
> Issue Type: New Feature
> Components: Commons
> Reporter: Rupert Westenthaler
> Assignee: Rupert Westenthaler
>
> If a bundle contains the "Data-Files" header field the values are interpreted
> as paths within the Bundle that contain data files. Multiple paths can be
> defined by using ',' as separator.
> A BundleListerner keeps track of all active Bundles with this header and
> registers a DataFileProvider for the configured paths. By this data files
> contained by a Bundle are available via the main DataFileProvider.
> In addition the "Data-Files-Priority" header may by used to define the
> service ranking for the DataFileProvider created and registered for this
> bundle. Bundles that provide default data should use a negative value to
> ensure that they get overridden by Bundles that do not define this property.
> Bundles that need to override preexisting data files should use positive
> values. Note that the main DataFileProvider (loading files form the
> /datafiles folder) uses Integer.MAX_VALUE as ranking.
> Creating such Bundles can be done by adding
> "<Data-Files>{path1},{path2}</Data-Files>" to the instructions of the
> maven-bundle-plugin
> The first place to use this will be the "org.apache.stanbol.defaultdata"
> bundle that provides the minimal set of data needed for the configuration
> shipped with different launchers. Currently it contains the statistical model
> for OpenNLP.
> Current Situation
> * The path to the files needs to be hard coded in all bundles using this
> models (currently the opennlp-ner enhancement engine)
> * An own Classpath based DataFileProvider must be implemented and registered
> as Service to allow loading that resources via the classpath (while still
> using the DataFileProvider
> * Because the DataFileProvider is used additional files can be provided by
> copying Files to the /datafiles folder
> By using the proposed Bundle DataFileProvider
> * A component may define a dependency to the Bundle containing the required
> data. This ensures that required data are available.
> * The component must not do anything to get access to the data, because the
> required DataFileProvider for the Bundle is initialized automatically.
> * Default Data can be overridden by specifying the "Data-Files-Priority"
> header for a Bundle.
> * Additional data can be made available automatically by adding an other
> Bundle with the "Data-Files" header or by directly copying Files to the
> /datafiles folder
> For more Information on the Bundle Extender Pattern see
> http://www.aqute.biz/Snippets/Extender
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