[jira] [Resolved] (STANBOL-593) EntityIterator implementation based on Jena TDB that allows to filter Entities based on Triple Filters

["Rupert Westenthaler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STANBOL-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rupert Westenthaler resolved STANBOL-593.
-----------------------------------------

    Resolution: Fixed

implemented with revision #1330107
                
> EntityIterator implementation based on Jena TDB that allows to filter Entities based on Triple Filters
> ------------------------------------------------------------------------------------------------------
>
>                 Key: STANBOL-593
>                 URL: https://issues.apache.org/jira/browse/STANBOL-593
>             Project: Stanbol
>          Issue Type: New Feature
>          Components: Entity Hub
>            Reporter: Rupert Westenthaler
>            Assignee: Rupert Westenthaler
>             Fix For: 0.10.0-incubating
>
>
> The FieldValueProcessor (EntityProcessor) already allows to filter Entities based on Triple Filters. However this requires to Iterate over all entities - something very ineffective if one wants only to index a rather small fraction of all Entities.
> To achieve better performance in such cases one needs an Component that uses a similar functionality to filter Entities within the Indexing Source. Such an implementation is very easy to implement based on Jena TDB as the low level API natively supports filtered iterators.
> Indexing configurations would than use a EntityIterator/EntityDataProvider combination as source for the indexing. A according configuration would look like
>     entityIdIterator=org.apache.stanbol.entityhub.indexing.source.jenatdb.ResourceFilterIterator,config:entityTypes.properties
>     entityDataProvider=org.apache.stanbol.entityhub.indexing.source.jenatdb.RdfIndexingSource,source:rdfdata
> the entityTypes.properties file would require the following properties
>     field=rdf:type
>     values=dbp-ont:Person;dbp-ont:Place;dbp-ont:Organisation
> With this configuration the indexing process would only iterate over Persons, Places and Organisations present within the IndexingSource.

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