Well... Here is the query
PREFIX : <http://purl.bdrc.io/ontology/core/> PREFIX adm: <http://purl.bdrc.io/ontology/admin/> PREFIX bdr: <http://purl.bdrc.io/resource/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX tbr: <http://purl.bdrc.io/ontology/toberemoved/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX f: <java:io.bdrc.ldsearch.query.functions.CustomARQFunctions.> SELECT DISTINCT ?l WHERE { ?x skos:prefLabel ?l . FILTER (f:myFilter(?l) < 100) } Note that whene I change FILTER (f:myFilter(?l) < 100) to FILTER (STRLEN(?l) < 100), I don't get the 404 exception... Therefore it's not a connection issue. I thing it's more like a unresolved URI or so. Now, since you'are asking for it, here is the full fuseki config: ################################################################ # Fuseki configuration for BDRC, configures two endpoints: # - /bdrc is read-only # - /bdrcrw is read-write # # This was painful to come up with but the web interface basically allows no option # and there is no subclass inference by default so such a configuration file is necessary. # # The main doc sources are: # - https://jena.apache.org/documentation/fuseki2/fuseki-configuration .html # - https://jena.apache.org/documentation/assembler/assembler-howto.ht ml # - https://jena.apache.org/documentation/assembler/assembler.ttl # # See https://jena.apache.org/documentation/fuseki2/fuseki-layout.html for the destination of this file. @prefix fuseki: <http://jena.apache.org/fuseki#> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> . # @prefix tdb2: <http://jena.apache.org/2016/tdb#> . @prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> . @prefix : <http://base/#> . @prefix text: <http://jena.apache.org/text#> . @prefix skos: <http://www.w3.org/2004/02/skos/core#> . @prefix adm: <http://purl.bdrc.io/ontology/admin/> . @prefix bdd: <http://purl.bdrc.io/data/> . @prefix bdo: <http://purl.bdrc.io/ontology/core/> . @prefix bdr: <http://purl.bdrc.io/resource/> . @prefix f: <java:io.bdrc.ldsearch.query.functions.CustomARQFunctions.> . ja:loadClass "io.bdrc.ldsearch.query.functions.CustomARQFunctions" . # [] ja:loadClass "org.seaborne.tdb2.TDB2" . # tdb2:DatasetTDB2 rdfs:subClassOf ja:RDFDataset . # tdb2:GraphTDB2 rdfs:subClassOf ja:Model . [] rdf:type fuseki:Server ; fuseki:services ( :bdrcrw # :bdrcro ) . :bdrcrw rdf:type fuseki:Service ; fuseki:name "bdrcrw" ; # name of the dataset in the url fuseki:serviceQuery "query" ; # SPARQL query service fuseki:serviceUpdate "update" ; # SPARQL update service fuseki:serviceUpload "upload" ; # Non-SPARQL upload service fuseki:serviceReadWriteGraphStore "data" ; # SPARQL Graph store protocol (read and write) fuseki:dataset :bdrc_text_dataset ; . # :bdrcro rdf:type fuseki:Service ; # fuseki:name "bdrc" ; # fuseki:serviceQuery "query" ; # fuseki:serviceReadGraphStore "data" ; # fuseki:dataset :bdrc_text_dataset ; # . # using TDB :dataset_bdrc rdf:type tdb:DatasetTDB ; tdb:location "/etc/fuseki/databases/bdrc" ; tdb:unionDefaultGraph true ; . # # try using TDB2 # :dataset_bdrc rdf:type tdb2:DatasetTDB2 ; # tdb2:location "/etc/fuseki/databases/bdrc" ; # tdb2:unionDefaultGraph true ; # . :bdrc_text_dataset rdf:type text:TextDataset ; text:dataset :dataset_bdrc ; text:index :bdrc_lucene_index ; . # Text index description :bdrc_lucene_index a text:TextIndexLucene ; text:directory <file:/etc/fuseki/lucene-bdrc> ; text:storeValues true ; text:multilingualSupport true ; text:entityMap :bdrc_entmap ; text:defineAnalyzers ( [ text:addLang "bo" ; text:analyzer [ a text:GenericAnalyzer ; text:class "io.bdrc.lucene.bo.TibetanAnalyzer" ; text:params ( [ text:paramName "segmentInWords" ; text:paramType text:TypeBoolean ; text:paramValue false ] [ text:paramName "lemmatize" ; text:paramType text:TypeBoolean ; text:paramValue true ] [ text:paramName "filterChars" ; text:paramType text:TypeBoolean ; text:paramValue false ] [ text:paramName "fromEwts" ; text:paramType text:TypeBoolean ; text:paramValue false ] ) ] ; ] [ text:addLang "bo-x-ewts" ; text:analyzer [ a text:GenericAnalyzer ; text:class "io.bdrc.lucene.bo.TibetanAnalyzer" ; text:params ( [ text:paramName "segmentInWords" ; text:paramType text:TypeBoolean ; text:paramValue false ] [ text:paramName "lemmatize" ; text:paramType text:TypeBoolean ; text:paramValue true ] [ text:paramName "filterChars" ; text:paramType text:TypeBoolean ; text:paramValue false ] [ text:paramName "fromEwts" ; text:paramType text:TypeBoolean ; text:paramValue true ] ) ] ; ] ) ; . # Index mappings :bdrc_entmap a text:EntityMap ; text:entityField "uri" ; text:uidField "uid" ; text:defaultField "label" ; text:langField "lang" ; text:graphField "graph" ; ## enable graph-specific indexing text:map ( [ text:field "label" ; text:predicate skos:prefLabel ] [ text:field "altLabel" ; text:predicate skos:altLabel ; ] [ text:field "rdfsLabel" ; text:predicate rdfs:label ; ] [ text:field "chunkContents" ; text:predicate bdo:chunkContents ; ] [ text:field "eTextTitle" ; text:predicate bdo:eTextTitle ; ] [ text:field "logMessage" ; text:predicate adm:logMessage ; ] [ text:field "noteText" ; text:predicate bdo:noteText ; ] [ text:field "workAuthorshipStatement" ; text:predicate bdo:workAuthorshipStatement ; ] [ text:field "workColophon" ; text:predicate bdo:workColophon ; ] [ text:field "workEditionStatement" ; text:predicate bdo:workEditionStatement ; ] [ text:field "workPublisherLocation" ; text:predicate bdo:workPublisherLocation ; ] [ text:field "workPublisherName" ; text:predicate bdo:workPublisherName ; ] [ text:field "workSeriesName" ; text:predicate bdo:workSeriesName ; ] ) ; . ################################################################### It would be wonderful to have the java:URI scheme thing working (all custom functions in a single class and method calls done directly in the sparql query : sounds like a dream !) Marc Le mardi 26 décembre 2017 à 13:22 -0500, ajs6f a écrit : > That exception doesn't appear to have anything to do with extension > functions. It indicates a problem between client and server. > > Please show at _least_ your actual query execution code, your > complete Fuseki config, and a complete stacktrace. > > > ajs6f > > > On Dec 26, 2017, at 1:17 PM, Marc Agate <[email protected]> > > wrote: > > > > I forgot to mention that according to > > https://jena.apache.org/documentation/query/java-uri.html > > I tried for testing purpose to set a PREFIX f: > > <java:io.bdrc.ldsearch.query.functions.CustomARQFunctions.>and > > added > > the following to fuseki config : > > ja:loadClass "io.bdrc.ldsearch.query.functions.CustomARQFunctions" > > . > > where CustomARQFunctions is : > > public class CustomARQFunctions { public static > > NodeValue myFilter(NodeValue value1){ int i > > = > > value1.asString().length(); return > > NodeValue.makeInteger(i); } > > } > > since according to > > https://jena.apache.org/documentation/query/writing_functions.html > > using the java:URI scheme "dynamically loads the code, which must > > be on > > the Java classpath. With this scheme, the function URI gives the > > class > > name. There is automatic registration of a wrapper into the > > function > > registry. This way, no explicit registration step is needed by the > > application and queries issues with the command line tools can load > > custom functions." > > but no luck: I keep getting the following exception: > > Exception in thread "main" HttpException: 404 at > > org.apache.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java > > :328 > > ) at > > org.apache.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:28 > > 8) > > at > > org.apache.jena.sparql.engine.http.QueryEngineHTTP.execResultSetInn > > er(Q > > ueryEngineHTTP.java:348) at > > org.apache.jena.sparql.engine.http.QueryEngineHTTP.execSelect(Query > > Engi > > neHTTP.java:340) > > I am stuck ! > > Marc > > Le mardi 26 décembre 2017 à 18:56 +0100, Marc Agate a écrit : > > > Hi, > > > Adam's gave me the right direction. > > > I managed to load my function class in fuseki config using > > > ja:loadClass > > > but now remains the following issue (the function is not > > > registered)seefuseki logs : > > > [2017-12-26 16:10:13] exec WARN URI <http://purl.bdrc.io/f > > > unct > > > ions#MyFilterFunction> has no registered function factory > > > How can I register this function now that I have the code > > > available > > > onthe endpoint side ? > > > Thanks for helping > > > Marc. > > > > > > Le mardi 26 décembre 2017 à 17:43 +0000, Andy Seaborne a écrit : > > > > As well s Adam's point (and all the libraries your function > > > > needs, transitively) > > > > What is in the Fuseki log file?How was the data loaded into > > > > Fuseki? > > > > >> I printed out the >> FunctionRegistry > > > > And > > > > On 26/12/17 14:51, ajs6f wrote: > > > > > I'm not as familiar with the extension points of ARQ as I > > > > > wouldlike to be, but as I understand what you are doing, you > > > > > areregistering a new function with your _local_ registry, > > > > > then > > > > > firinga query at a _remote_ endpoint (which has a completely > > > > > independentregistry in a different JVM in a different > > > > > process, > > > > > potentially ina different _system_). > > > > > The query is getting interpreted and executed by that > > > > > remoteservice, not locally. So you need to register the > > > > > function > > > > > _there_. > > > > > Take a look at this thread: > > > > > https://lists.apache.org/thread.html/1cda23332af4264883e88697 > > > > > d994 > > > > > 605770edcde2f93ddea51240e4b8@%3Cusers.jena.apache.org%3E > > > > > It should get you started as to how to register > > > > > extensionfunctionality in Fuseki. > > > > > > > > > > Adam Soroka > > > > > > On Dec 26, 2017, at 9:34 AM, Marc Agate <[email protected] > > > > > > om> > > > > > > wrote: > > > > > > > > > > > > Hi ! > > > > > > > > > > > > I successfully implemented sparql queries using custom ARQ > > > > > > functions > > > > > > using the following (custom function code): > > > > > > > > > > > > **************** > > > > > > public class LevenshteinFilter extends FunctionBase2 { > > > > > > > > > > > > public LevenshteinFilter() { super() ; } > > > > > > > > > > > > public NodeValue exec(NodeValue value1, NodeValue > > > > > > value2){ > > > > > > LevenshteinDistance LD=new LevenshteinDistance(); > > > > > > int i = LD.apply(value1.asString(), > > > > > > value2.asString()); > > > > > > return NodeValue.makeInteger(i); > > > > > > } > > > > > > } > > > > > > *************** > > > > > > > > > > > > it works fine when I query against a Model loaded from a > > > > > > turtle > > > > > > file, > > > > > > like this: > > > > > > > > > > > > *************** > > > > > > InputStream input = > > > > > > QueryProcessor.class.getClassLoader().getResourceAsStream(" > > > > > > full > > > > > > .t > > > > > > tl"); > > > > > > model = > > > > > > ModelFactory.createMemModelMaker().createModel("default"); > > > > > > model.read(input,null,"TURTLE"); // null base > > > > > > URI, > > > > > > since > > > > > > model URIs are absolute > > > > > > input.close(); > > > > > > *************** > > > > > > > > > > > > with the query being sent like this : > > > > > > > > > > > > *************** > > > > > > String functionUri = "http://www.example1.org/LevenshteinFu > > > > > > ncti > > > > > > on > > > > > > "; > > > > > > FunctionRegistry.get().put(functionUri , > > > > > > LevenshteinFilter.class); > > > > > > > > > > > > String s = "whatever you want"; > > > > > > String sparql = prefixes+" SELECT DISTINCT ?l > > > > > > WHERE { > > > > > > ?x > > > > > > rdfs:label ?l . " + "FILTER(fct:LevenshteinFunction(?l, > > > > > > \"" + > > > > > > s > > > > > > + "\") > > > > > > < 4) }"; > > > > > > Query query = QueryFactory.create(sparql); > > > > > > QueryExecution qexec = > > > > > > QueryExecutionFactory.create(query, > > > > > > model); > > > > > > ResultSet rs = qexec.execSelect(); > > > > > > *************** > > > > > > > > > > > > However, if i use a working fuseki endpoint for the same > > > > > > dataset > > > > > > (full.ttl) like this : > > > > > > > > > > > > *************** > > > > > > fusekiUrl="http://localhost:3030/ds/query";; > > > > > > *************** > > > > > > > > > > > > sending the query like this (using > > > > > > QueryExecutionFactory.sparqlService(fusekiUrl,query) > > > > > > instead of > > > > > > QueryExecutionFactory.create(query,model) ): > > > > > > > > > > > > *************** > > > > > > String functionUri = "http://www.example1.org/LevenshteinFu > > > > > > ncti > > > > > > on > > > > > > "; > > > > > > FunctionRegistry.get().put(functionUri , > > > > > > LevenshteinFilter.class); > > > > > > > > > > > > String s = "whatever you want"; > > > > > > String sparql = prefixes+" SELECT DISTINCT ?l > > > > > > WHERE { > > > > > > ?x > > > > > > rdfs:label ?l . " + "FILTER(fct:LevenshteinFunction(?l, \"" > > > > > > + s > > > > > > + > > > > > > "\") > > > > > > < 4) }"; > > > > > > Query query = QueryFactory.create(sparql); > > > > > > QueryExecution qexec = > > > > > > QueryExecutionFactory.sparqlService(fusekiUrl,query); > > > > > > ResultSet rs = qexec.execSelect(); > > > > > > *************** > > > > > > > > > > > > Then I don't get any results back. In both cases I printed > > > > > > out > > > > > > the > > > > > > FunctionRegistry and they contain exactly the same entries, > > > > > > especially > > > > > > : > > > > > > > > > > > > key=http://www.example1.org/LevenshteinFunction value: > > > > > > org.apache.jena.sparql.function.FunctionFactoryAuto@5a45133 > > > > > > e > > > > > > > > > > > > Any clue ? > > > > > > > > > > > > Thanks > >
