/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
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* The Apache Software License, Version 1.1
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* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
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package org.jrdf.example.performance;
import static org.jrdf.graph.AnyObjectNode.ANY_OBJECT_NODE;
import static org.jrdf.graph.AnyPredicateNode.ANY_PREDICATE_NODE;
import org.jrdf.graph.Graph;
import org.jrdf.graph.GraphException;
import org.jrdf.graph.SubjectNode;
import org.jrdf.graph.Triple;
import org.jrdf.graph.URIReference;
import org.jrdf.util.ClosableIterable;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
public class UpdatePerformanceImpl implements UpdatePerformance {
private final int nodesToUpdate;
private final String subjectPrefix;
private int noUpdates;
public UpdatePerformanceImpl(int newNodesToUpdate, String newSubjectPrefix) {
this.nodesToUpdate = newNodesToUpdate;
this.subjectPrefix = newSubjectPrefix;
}
public void updatePerformance(Graph graph, GraphPerformance performance) throws Exception {
long startTime = System.currentTimeMillis();
for (int index = 0; index < nodesToUpdate; index++) {
URI subjectURI = URI.create(subjectPrefix + index);
List<Triple> triplesToChange = addTriplesToArray(graph, subjectURI);
for (Triple triple : triplesToChange) {
URI subject = ((URIReference) triple.getSubject()).getURI();
URIReference newSubject = graph.getElementFactory().createURIReference(
URI.create(subject.toString() + "hello"));
graph.add(newSubject, triple.getPredicate(), triple.getObject());
graph.remove(triple);
noUpdates++;
}
}
performance.outputResult(graph, startTime, "Testing Update Performance: " + noUpdates);
}
private List<Triple> addTriplesToArray(Graph graph, URI subjectURI) throws Exception {
URIReference newSubject = graph.getElementFactory().createURIReference(subjectURI);
ClosableIterable<Triple> triples = findAllPredicates(graph, newSubject);
List<Triple> triplesToChange = new ArrayList<Triple>();
try {
for (Triple triple : triples) {
triplesToChange.add(triple);
}
} finally {
triples.iterator().close();
}
return triplesToChange;
}
private ClosableIterable<Triple> findAllPredicates(Graph graph, SubjectNode subject) throws GraphException {
return graph.find(subject, ANY_PREDICATE_NODE, ANY_OBJECT_NODE);
}
}