[JENA-1026] listIndividuals (and listClasses) performance issue

• Type: Question
• Status: Closed
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: Jena 3.0.0
• Component/s: Ontology API

Environment

Verified on Jena 3.0.1-SNAPSHOT (2015-09-13) w/ Ubuntu 14.04/x64, 4 cores i7-3520M, 16G ram, SSD disk, Open JDK 1.8.0_45-internal

• Assignee: Unassigned
• Reporter: Stian Soiland-Reyes
• Created: 13/Sep/15 02:10
• Updated: 20/Sep/15 20:29
• Resolved: 20/Sep/15 20:27

Description

As reported by Maria Clementina Latanzi on dev@jena 2015-09-12:

I'm working with Jena. I have an ontology with no more than 50 individuals,
and I use Jena to
get individuals from Ontology by calling listIndividual (
com.hp.hpl.jena.ontology.OntModel.listIndividuals). When I call this
method, it's taking a lot of time up to 20 seconds. When debugging, it
takes more than 1 minute to return. Other methods like *listClass *return
instantly.

package testOnto;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import com.hp.hpl.jena.ontology.Individual;
import com.hp.hpl.jena.ontology.OntClass;
import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.rdf.model.impl.StatementImpl;
import com.hp.hpl.jena.shared.JenaException;
import com.hp.hpl.jena.util.FileManager;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;

public class onto {
    static String Ontofile = "C:/Users/Sig/Clemen/OntologiasArchivos/OntologiaIngesta.owl";

    public static void main(String[] args) {
        //crea ontologia

        OntModel m = ModelFactory.createOntologyModel();
        try {
            InputStream in = FileManager.get().open("C:/Users/Sig/Clemen/OntologiasArchivosOntologiaDeAlimentos.owl");
            if (in ==null) {
                System.out.println("ERROR abriendo archivo" + Ontofile);
                return;
            }
            else {  m.read(in, "RDF/XML");
                System.out.println("archivo" + Ontofile + "leido exitosamente" );
            }
        } catch (JenaException je) {
            System.out.println("ERROR leyendo archivo" + je.getMessage());
            je.printStackTrace();
            System.exit(0);
        }

        long startMilC = System.currentTimeMillis();
        System.out.println("Start list classes: " + startMilC);
        ExtendedIterator classes = m.listClasses();
        long endMilC = System.currentTimeMillis();
        System.out.println("Duration ListIndividuals: " + (endMilC -startMilC));
        long startMil = System.currentTimeMillis();

        System.out.println("Start ListIndividuals: " + startMil);
        ExtendedIterator individuos = m.listIndividuals();
        long endMil = System.currentTimeMillis();
        System.out.println("Duration ListIndividuals: " + (endMil - startMil));

    }
}

See attached ontology and test case.

Verified against current 3.0.1-SNAPSHOT.