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The SparqlIndexer listens to the repository generated JMS events and index records to a the triplestore like Fuseki, Sesame etc. It implements the org.fcrepo.indexer.Indexer interface for the indexing functionalities, which consists of the methods to handle new/updated records and deleted records. |
Once the SparqlIndexer configured to index the records, we can use the triplestore to perform external SPARQL searchings with with the SPARQL Recipes.
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The triplestore need to be started before running the message consumer web app. Please follow the instructions to setup the a triplestore. |
Configuration
The SparqlIndexer is indexer is configured using Spring that can be done using through the Java bean setter methods. Here is a sample configuration fragment showing how to configure and use itthe SparqlIndexer:
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<!-- sparql-update indexer -->
<bean id="sparqlUpdate" class="org.fcrepo.indexer.sparql.SparqlIndexer">
<!-- fuseki -->
<property name="queryBase" value="http://${fuseki.host:localhost}:${fuseki.port:3030}/test/query"/>
<property name="updateBase" value="http://${fuseki.host:localhost}:${fuseki.port:3030}/test/update"/>
<property name="formUpdates">
<value type="java.lang.Boolean">false</value>
</property>
<!-- sesame -->
<!--
<property name="queryBase" value="http://${sesame.host:localhost}:${sesame.port:8081}/openrdf-sesame/repositories/test"/>
<property name="updateBase" value="http://${sesame.host:localhost}:${sesame.port:8081}/openrdf-sesame/repositories/test/statements"/>
<property name="formUpdates">
<value type="java.lang.Boolean">true</value>
</property>
-->
</bean>
<!-- Message Driven POJO (MDP) that manages individual indexers -->
<bean id="indexerGroup" class="org.fcrepo.indexer.IndexerGroup">
<constructor-arg name="repositoryURL" value="http://${fcrepo.host:localhost}:${fcrepo.port:8080}${fcrepo.context:/}rest" />
<constructor-arg name="indexers">
<set>
...
<ref bean="sparqlUpdate"/>
...
</set>
</constructor-arg>
...
</bean> |