The RdfPersistenceIndexer listens to the repository generated JMS events and persists metadata in a configurable RDF format to the file system. 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. |
RDF is the native format supported by Fedora 4, and provides more information than the JCR/XML persistance.
The RDF files are stored in the configured path in a directory tree that corresponds to the repository URI. So the the resource at |
The indexer is configured using Spring that can be done with Java bean setter methods. The base filesystem storage path, RDF variant, and filename extension be configured. Here is a sample configuration fragment showing how to configure and use the RdfPersistenceIndexer:
<!-- jcr/xml persistence Indexer --> <bean id="rdfPersist" class="org.fcrepo.indexer.persistence.RdfPersistenceIndexer"> <constructor-arg value="${fcrepo.rdf.storage:fcrepo4-rdf}" /> <constructor-arg value="${fcrepo.rdf.lang:TURTLE}" /> <constructor-arg value="${fcrepo.rdf.ext:.ttl}" /> </bean> <!-- Message Driven POJO (MDP) that manages individual indexers --> <bean id="indexerGroup" class="org.fcrepo.indexer.IndexerGroup"> <constructor-arg name="indexers"> <set> ... <ref bean="rdfPersist"/> ... </set> </constructor-arg> ... </bean> |
Valid values for fcrepo.rdf.lang (the RDF variant used) are: