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Rdf4jUpdateModule.java
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Rdf4jUpdateModule.java
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package cz.cvut.spipes.modules;
import cz.cvut.spipes.constants.KBSS_MODULE;
import cz.cvut.spipes.constants.SML;
import cz.cvut.spipes.engine.ExecutionContext;
import cz.cvut.spipes.exception.ModuleConfigurationInconsistentException;
import cz.cvut.spipes.exceptions.RepositoryAccessException;
import cz.cvut.spipes.util.QueryUtils;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.ResourceFactory;
import org.apache.jena.vocabulary.RDF;
import org.eclipse.rdf4j.query.MalformedQueryException;
import org.eclipse.rdf4j.query.QueryLanguage;
import org.eclipse.rdf4j.query.Update;
import org.eclipse.rdf4j.query.UpdateExecutionException;
import org.eclipse.rdf4j.repository.Repository;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.repository.RepositoryException;
import org.eclipse.rdf4j.repository.sparql.SPARQLRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.topbraid.spin.vocabulary.SP;
import java.util.List;
import java.util.stream.Collectors;
public class Rdf4jUpdateModule extends AbstractModule {
private static final Logger LOG = LoggerFactory.getLogger(Rdf4jUpdateModule.class.getName());
private static final String TYPE_URI = KBSS_MODULE.getURI() + "rdf4j-update";
private static final String PROPERTY_PREFIX_URI = KBSS_MODULE.getURI() + "rdf4j";
/**
* URL of the Rdf4j server
*/
static final Property P_RDF4J_SERVER_URL = getParameter("p-rdf4j-server-url");
private String rdf4jServerURL;
/**
* Rdf4j repository ID
*/
static final Property P_RDF4J_REPOSITORY_NAME = getParameter("p-rdf4j-repository-name");
private String rdf4jRepositoryName;
private List<String> updateQueries;
static final Property P_RDF4J_STOP_ITERATION_ON_STABLE_TRIPLE_COUNT =
getParameter("p-stop-iteration-on-stable-triple-count");
private boolean onlyIfTripleCountChanges;
private int iterationCount;
private Repository updateRepository;
public void setUpdateQueries(List<String> updateQueries) {
this.updateQueries = updateQueries;
}
public List<String> getUpdateQueries() {
return updateQueries;
}
public int getIterationCount() {
return iterationCount;
}
public void setIterationCount(int iterationCount) {
this.iterationCount = iterationCount;
}
public String getRdf4jServerURL() {
return rdf4jServerURL;
}
public void setRdf4jServerURL(String rdf4jServerURL) {
this.rdf4jServerURL = rdf4jServerURL;
}
public boolean isOnlyIfTripleCountChanges() {
return onlyIfTripleCountChanges;
}
public void setOnlyIfTripleCountChanges(boolean onlyIfTripleCountChanges) {
this.onlyIfTripleCountChanges = onlyIfTripleCountChanges;
}
public String getRdf4jRepositoryName() {
return rdf4jRepositoryName;
}
public void setRdf4jRepositoryName(String rdf4jRepositoryName) {
this.rdf4jRepositoryName = rdf4jRepositoryName;
}
void setUpdateRepository(Repository updateRepository) {
this.updateRepository = updateRepository;
}
public static Resource createUpdateQueryResource(Model model, String updateQuery) {
return
model.createResource()
.addProperty(RDF.type, SML.updateQuery)
.addProperty(SP.text, ResourceFactory.createPlainLiteral(updateQuery));
}
private static Property getParameter(final String name) {
return ResourceFactory.createProperty(PROPERTY_PREFIX_URI + "/" + name);
}
@Override
ExecutionContext executeSelf() {
try (RepositoryConnection updateConnection = updateRepository.getConnection()) {
LOG.debug("Connected to {}", rdf4jRepositoryName);
long newTriplesCount = updateConnection.size();
long oldTriplesCount;
LOG.debug("Number of triples before execution of updates: {}", newTriplesCount);
for(int i = 0;i < iterationCount; i++) {
oldTriplesCount = newTriplesCount;
for (int j = 0; j < updateQueries.size(); j++) {
String updateQuery = updateQueries.get(j);
if (LOG.isTraceEnabled()) {
String queryComment = QueryUtils.getQueryComment(updateQuery);
LOG.trace(
"Executing iteration {}/{} with {}/{} query \"{}\" ...",
i+1, iterationCount, j + 1, updateQueries.size(), queryComment
);
}
makeUpdate(updateQuery, updateConnection);
}
newTriplesCount = updateConnection.size();
LOG.debug("Number of triples after finishing iteration {}/{}: {}",
i+1, iterationCount, newTriplesCount
);
if (onlyIfTripleCountChanges && (newTriplesCount == oldTriplesCount)) {
LOG.debug("Stopping execution of iterations as triples count did not change.");
break;
}
}
} catch (RepositoryException e) {
throw new RepositoryAccessException(rdf4jRepositoryName, e);
}
return this.executionContext;
}
void makeUpdate(String updateString, RepositoryConnection updateConnection) {
Update prepareUpdate;
try {
prepareUpdate = updateConnection.prepareUpdate(QueryLanguage.SPARQL, updateString);
} catch (MalformedQueryException e) {
LOG.error("Malformed Query, query text:\n{}",
updateString);
return;
} catch (RepositoryException e) {
LOG.error("Repository exception\n{}",
e.getMessage());
return;
}
try {
assert prepareUpdate != null;
prepareUpdate.execute();
LOG.debug("Update successful");
} catch (UpdateExecutionException e) {
LOG.error("Update execution exception, query text:\n{}\n{}",
updateString,
e.getMessage());
}
}
@Override
public String getTypeURI() {
return TYPE_URI;
}
@Override
public void loadConfiguration() {
rdf4jServerURL = getEffectiveValue(P_RDF4J_SERVER_URL).asLiteral().getString();
rdf4jRepositoryName = getEffectiveValue(P_RDF4J_REPOSITORY_NAME).asLiteral().getString();
iterationCount = getPropertyValue(KBSS_MODULE.has_max_iteration_count,1);
onlyIfTripleCountChanges = getPropertyValue(P_RDF4J_STOP_ITERATION_ON_STABLE_TRIPLE_COUNT,false);
LOG.debug("Iteration count={}\nOnlyIf...Changes={}"
,iterationCount
,onlyIfTripleCountChanges);
if (updateRepository != null && rdf4jServerURL != null) {
throw new ModuleConfigurationInconsistentException(
"Repository is already initialized. Trying to override its configuration from RDF.");
}
updateRepository = new SPARQLRepository(
rdf4jServerURL + "/repositories/" + rdf4jRepositoryName + "/statements"
);
updateQueries = loadUpdateQueries();
}
private List<String> loadUpdateQueries() {
return getResourcesByProperty(SML.updateQuery).stream().map(
r -> r.getProperty(SP.text).getLiteral().getString()).collect(Collectors.toList());
}
}