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SRU and Lucene

SRU and Lucene. Ralph LeVan Research Scientist levan@oclc.org. SRU Overview. A Simple Web Service Supports REST-ful and SOAP requests Responses are always XML records Supports Search and Retrieve Uses a Standard Query Grammar Supports Self-Configuring Clients

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SRU and Lucene

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  1. SRU and Lucene Ralph LeVan Research Scientist levan@oclc.org

  2. SRU Overview • A Simple Web Service • Supports REST-ful and SOAP requests • Responses are always XML records • Supports Search and Retrieve • Uses a Standard Query Grammar • Supports Self-Configuring Clients • A Gateway to Local Databases

  3. SRU Features • Explain Records • CQL Query Grammar • Persistent Result Sets • XML Database Records Returned • Index Browses • Stylesheets

  4. Explain Records • serverInfo • databaseInfo • metaInfo • indexInfo • schemaInfo • configInfo

  5. serverInfo • Generated Automatically • host • port • database

  6. databaseInfo • From SRWDatabase.props • databaseInfo.title • databaseInfo.description • databaseInfo.contact • Provided Automatically • implementation

  7. metaInfo • From SRWDatabase.props • metaInfo.dateModified • metaInfo.aggregatedFrom • metaInfo.dateAggregated

  8. indexInfo • Generated Automatically • “local” index set and Lucene index names • From SRWDatabase.props • qualifier.<indexSet>.<indexName> = <LuceneIndexName> • Used only if you want to map other index names to your Lucene indexes (e.g. qualifier.dc.identifier=id)

  9. schemaInfo • Generated Automatically • LuceneDocument • From SRWDatabase.props • xmlSchemas=<list of name> • <schemaName>.identifier= • <schemaName>.location= • <schemaName>.namespace= • <schemaName>.title= • [<schemaName>.transformer=] • [<schemaName>.resolver=]

  10. schemaInfo Example xmlSchemas=LuceneDocument, DC LuceneDocument.identifier=info:srw/schema/1/LuceneDocument LuceneDocument.location=http://www.oclc.org/standards/Lucene/schema/LuceneDocument.xsd LuceneDocument.namespace=http://www.oclc.org/LuceneDocument LuceneDocument.title=Lucene Demo Database records in their internal format

  11. schemaInfo Example (cont.) DC.identifier=info:srw/schema/1/dc-v1.1 DC.location=http://www.loc.gov/zing/srw/dc-schema.xsd DC.title=DC: Dublin Core Elements DC.transformer=LuceneToDC.xsl

  12. configInfo • Generated Automatically • maximumRecords (20) • numberOfRecords (10) • resultSetTTL (300) • From SRWDatabase.props • configInfo.maximumRecords • configInfo.numberOfRecords • configInfo.resultSetTTL

  13. CQL Query Grammar • Builtin: BasicLuceneQueryTranslator • CqlQueryTranslator • Query makeQuery(CQLNode cn); • Term getTerm(); • From SRWDatabase.props • SRWLuceneDatabase. CqlToLuceneQueryTranslator= <ClassName>

  14. Persistent Result Sets • Builtin: LuceneQueryResult

  15. XML Database Records • Builtin: BasicLuceneRecordResolver • RecordResolver • Void init(Properties props); • Record resolve(Document doc, String IdFieldName, ExtraDataType extraDataType) • From SRWDatabase.props • <schemaName>.resolver=<ClassName> • SRWLuceneDatabase.idFieldName= <FieldName>

  16. Index Browses • Builtin: SRWLuceneDatabase.getTerms()

  17. Stylesheets • From SRWDatabase.props • explainStyleSheet= /SRW/explainResponse.xsl • scanStyleSheet=/SRW/scanResponse.xsl • searchStyleSheet= /SRW/searchRetrieveResponse.xsl

  18. Making the Magic Happen • Drop the SRWLucene.war into your <tomcat>/webapps directory • Restart Tomcat • Edit <tomcat>/webapps/SRWLucene/WEB-INF/classes/SRWServer.props • Restart Tomcat

  19. Sample SRWServer.props db.LuceneDemoDB.class= ORG.oclc.os.SRW.Lucene.SRWLuceneDatabase db.LuceneDemoDB.home= f:/lucene-2.0.0 db.LuceneDemoDB.configuration= SRWDatabase.props

  20. Sample SRWDatabase.props databaseInfo.title=Lucene Demo Database databaseInfo.description=An index of the source code for Lucene databaseInfo.contact=Ralph LeVan (levan@oclc.org) qualifier.cql.serverChoice=contents explainStyleSheet=/SRWLucene/explainResponse.xsl scanStyleSheet=/SRWLucene/scanResponse.xsl searchStyleSheet= /SRWLucene/searchRetrieveResponse.xsl

  21. Resources • http://www.oclc.org/research/software/srw • http://staff.oclc.org/~levan/SRWLuceneSource.jar • http://staff.oclc.org/~levan/SRWLucene.war • http://staff.oclc.org/~levan/Implementing%20an%20SRWLuceneDatabase.doc • http://staff.oclc.org/~levan/SRU%20and%20Lucene.ppt • http://alcme.oclc.org/srw/SRUServerTester.html

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