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Faster Graph query for sprawl interface; add caching as it is still quite slow

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This commit is contained in:
Graham Triggs 2015-11-06 11:15:39 +00:00
parent cc300bf419
commit dd76bb73a4
1 changed files with 55 additions and 30 deletions
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85
webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/sparql/RDFServiceSparql.java
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@ -11,6 +11,7 @@ import java.io.StringWriter;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
@ -87,6 +88,9 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
protected HttpClient httpClient;
protected boolean rebuildGraphURICache = true;
private List<String> graphURIs = null;
/**
* Returns an RDFService for a remote repository
* @param String - URI of the read SPARQL endpoint for the knowledge base
@ -215,6 +219,8 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
} catch (Exception e) {
log.error(e, e);
throw new RDFServiceException(e);
} finally {
rebuildGraphURICache = true;
}
return true;
}
@ -413,12 +419,16 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
*/
@Override
public List<String> getGraphURIs() throws RDFServiceException {
return getGraphURIsFromSparqlQuery();
if (graphURIs == null || rebuildGraphURICache) {
graphURIs = getGraphURIsFromSparqlQuery();
rebuildGraphURICache = false;
}
return graphURIs;
}
private List<String> getGraphURIsFromSparqlQuery() throws RDFServiceException {
String fastJenaQuery = "SELECT DISTINCT ?g WHERE { GRAPH ?g {} } ORDER BY ?g";
String standardQuery = "SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } } ORDER BY ?g";
String standardQuery = "SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } }";
List<String> graphURIs = new ArrayList<String>();
try {
graphURIs = getGraphURIsFromSparqlQuery(fastJenaQuery);
@ -427,6 +437,7 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
}
if (graphURIs.isEmpty()) {
graphURIs = getGraphURIsFromSparqlQuery(standardQuery);
Collections.sort(graphURIs);
}
return graphURIs;
}
@ -537,11 +548,19 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
}
public void addModel(Model model, String graphURI) throws RDFServiceException {
verbModel(model, graphURI, "INSERT");
try {
verbModel(model, graphURI, "INSERT");
} finally {
rebuildGraphURICache = true;
}
}
public void deleteModel(Model model, String graphURI) throws RDFServiceException {
verbModel(model, graphURI, "DELETE");
try {
verbModel(model, graphURI, "DELETE");
} finally {
rebuildGraphURICache = true;
}
}
private void verbModel(Model model, String graphURI, String verb) throws RDFServiceException {
@ -573,37 +592,43 @@ public class RDFServiceSparql extends RDFServiceImpl implements RDFService {
}
protected void addTriple(Triple t, String graphURI) throws RDFServiceException {
try {
StringBuffer updateString = new StringBuffer();
updateString.append("INSERT DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "");
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
StringBuffer updateString = new StringBuffer();
updateString.append("INSERT DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" );
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.ADD, graphURI);
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.ADD, graphURI);
} finally {
rebuildGraphURICache = true;
}
}
protected void removeTriple(Triple t, String graphURI) throws RDFServiceException {
try {
StringBuffer updateString = new StringBuffer();
updateString.append("DELETE DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "");
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
StringBuffer updateString = new StringBuffer();
updateString.append("DELETE DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" );
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.REMOVE, graphURI);
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.REMOVE, graphURI);
} finally {
rebuildGraphURICache = true;
}
}
@Override