/**
* Queries the {@link #rdfEndpoint(String)} with each of the {@link #rdfQueries} and harvests the
* results of the query.
*/
private void harvestFromEndpoint() {
Query query;
QueryExecution qExec;
for (String rdfQuery : rdfQueries) {
if (closed) break;
logger.info(
"Harvesting with query: [{}] on index [{}] and type [{}]", rdfQuery, indexName, typeName);
try {
query = QueryFactory.create(rdfQuery);
} catch (QueryParseException qpe) {
logger.error("Could not parse [{}]. Please provide a relevant query. {}", rdfQuery, qpe);
continue;
}
qExec = QueryExecutionFactory.sparqlService(rdfEndpoint, query);
try {
harvest(qExec);
} catch (Exception e) {
logger.error("Exception [{}] occurred while harvesting", e.getLocalizedMessage());
} finally {
qExec.close();
}
}
}
void runTestSelect(Query query, QueryExecution qe) throws Exception {
// Do the query!
ResultSetRewindable resultsActual = ResultSetFactory.makeRewindable(qe.execSelect());
qe.close();
if (results == null) return;
// Assumes resultSetCompare can cope with full isomorphism possibilities.
ResultSetRewindable resultsExpected;
if (results.isResultSet())
resultsExpected = ResultSetFactory.makeRewindable(results.getResultSet());
else if (results.isModel())
resultsExpected = ResultSetFactory.makeRewindable(results.getModel());
else {
fail("Wrong result type for SELECT query");
resultsExpected = null; // Keep the compiler happy
}
if (query.isReduced()) {
// Reduced - best we can do is DISTINCT
resultsExpected = unique(resultsExpected);
resultsActual = unique(resultsActual);
}
// Hack for CSV : tests involving bNodes need manually checking.
if (testItem.getResultFile().endsWith(".csv")) {
resultsActual = convertToStrings(resultsActual);
resultsActual.reset();
int nActual = ResultSetFormatter.consume(resultsActual);
int nExpected = ResultSetFormatter.consume(resultsExpected);
resultsActual.reset();
resultsExpected.reset();
assertEquals("CSV: Different number of rows", nExpected, nActual);
boolean b = resultSetEquivalent(query, resultsExpected, resultsActual);
if (!b) System.out.println("Manual check of CSV results required: " + testItem.getName());
return;
}
boolean b = resultSetEquivalent(query, resultsExpected, resultsActual);
if (!b) {
resultsExpected.reset();
resultsActual.reset();
boolean b2 = resultSetEquivalent(query, resultsExpected, resultsActual);
printFailedResultSetTest(query, qe, resultsExpected, resultsActual);
}
assertTrue("Results do not match: " + testItem.getName(), b);
return;
}
/**
* Query SPARQL endpoint with a SELECT query
*
* @param qExec QueryExecution encapsulating the query
* @return model retrieved by querying the endpoint
*/
private Model getSelectModel(QueryExecution qExec) {
Model model = ModelFactory.createDefaultModel();
Graph graph = model.getGraph();
ResultSet results = qExec.execSelect();
while (results.hasNext()) {
QuerySolution sol = results.next();
String subject;
String predicate;
RDFNode object;
try {
subject = sol.getResource("s").toString();
predicate = sol.getResource("p").toString();
object = sol.get("o");
} catch (NoSuchElementException e) {
logger.error("SELECT query does not return a (?s ?p ?o) Triple");
continue;
}
Node objNode;
if (object.isLiteral()) {
Literal obj = object.asLiteral();
objNode = NodeFactory.createLiteral(obj.getString(), obj.getDatatype());
} else {
objNode = NodeFactory.createLiteral(object.toString());
}
graph.add(
new Triple(NodeFactory.createURI(subject), NodeFactory.createURI(predicate), objNode));
}
return model;
}
@Override
protected void runTestForReal() throws Throwable {
Query query = null;
try {
try {
query = queryFromTestItem(testItem);
} catch (QueryException qEx) {
query = null;
qEx.printStackTrace(System.err);
fail("Parse failure: " + qEx.getMessage());
throw qEx;
}
Dataset dataset = setUpDataset(query, testItem);
if (dataset == null && !doesQueryHaveDataset(query)) fail("No dataset for query");
QueryExecution qe = null;
if (dataset == null) qe = QueryExecutionFactory.create(query, queryFileManager);
else qe = QueryExecutionFactory.create(query, dataset);
try {
if (query.isSelectType()) runTestSelect(query, qe);
else if (query.isConstructType()) runTestConstruct(query, qe);
else if (query.isDescribeType()) runTestDescribe(query, qe);
else if (query.isAskType()) runTestAsk(query, qe);
} finally {
qe.close();
}
} catch (IOException ioEx) {
// log.debug("IOException: ",ioEx) ;
fail("IOException: " + ioEx.getMessage());
throw ioEx;
} catch (NullPointerException ex) {
throw ex;
} catch (Exception ex) {
ex.printStackTrace(System.err);
fail("Exception: " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
/**
* Returns the string value of the first of the properties in the uriDescriptionList for the given
* resource (as an URI). In case the resource does not have any of the properties mentioned, its
* URI is returned. The value is obtained by querying the endpoint and the endpoint is queried
* repeatedly until it gives a response (value or the lack of it)
*
* <p>It is highly recommended that the list contains properties like labels or titles, with test
* values.
*
* @param uri - the URI for which a label is required
* @return a String value, either a label for the parameter or its value if no label is obtained
* from the endpoint
*/
private String getLabelForUri(String uri) {
String result;
if (uriLabelCache.containsKey(uri)) {
return uriLabelCache.get(uri);
}
for (String prop : uriDescriptionList) {
String innerQuery = "SELECT ?r WHERE {<" + uri + "> <" + prop + "> ?r } LIMIT 1";
try {
Query query = QueryFactory.create(innerQuery);
QueryExecution qExec = QueryExecutionFactory.sparqlService(rdfEndpoint, query);
boolean keepTrying = true;
while (keepTrying) {
keepTrying = false;
try {
ResultSet results = qExec.execSelect();
if (results.hasNext()) {
QuerySolution sol = results.nextSolution();
result = EEASettings.parseForJson(sol.getLiteral("r").getLexicalForm());
if (!result.isEmpty()) {
uriLabelCache.put(uri, result);
return result;
}
}
} catch (Exception e) {
keepTrying = true;
logger.warn("Could not get label for uri {}. Retrying.", uri);
} finally {
qExec.close();
}
}
} catch (QueryParseException qpe) {
logger.error("Exception for query {}. The label cannot be obtained", innerQuery);
}
}
return uri;
}
/**
* Get a set of unique queryObjName returned from a select query
*
* <p>Used to retrieve sets of modified objects used in sync
*
* @param rdfQuery query to execute
* @param queryObjName name of the object returned
* @return set of values for queryObjectName in the rdfQuery result
*/
HashSet<String> executeSyncQuery(String rdfQuery, String queryObjName) {
HashSet<String> rdfUrls = new HashSet<String>();
Query query;
try {
query = QueryFactory.create(rdfQuery);
} catch (QueryParseException qpe) {
logger.warn(
"Could not parse [{}]. Please provide a relevant query. {}",
rdfQuery,
qpe.getLocalizedMessage());
return null;
}
QueryExecution qExec = QueryExecutionFactory.sparqlService(rdfEndpoint, query);
try {
ResultSet results = qExec.execSelect();
while (results.hasNext()) {
QuerySolution sol = results.nextSolution();
try {
String value = sol.getResource(queryObjName).toString();
rdfUrls.add(value);
} catch (NoSuchElementException e) {
logger.error("Encountered a NoSuchElementException: " + e.getLocalizedMessage());
return null;
}
}
} catch (Exception e) {
logger.error(
"Encountered a [{}] while querying the endpoint for sync", e.getLocalizedMessage());
return null;
} finally {
qExec.close();
}
return rdfUrls;
}
void runTestAsk(Query query, QueryExecution qe) throws Exception {
boolean result = qe.execAsk();
if (results != null) {
if (results.isBoolean()) {
boolean b = results.getBooleanResult();
assertEquals("ASK test results do not match", b, result);
} else {
Model resultsAsModel = results.getModel();
StmtIterator sIter =
results.getModel().listStatements(null, RDF.type, ResultSetGraphVocab.ResultSet);
if (!sIter.hasNext()) throw new QueryTestException("Can't find the ASK result");
Statement s = sIter.nextStatement();
if (sIter.hasNext()) throw new QueryTestException("Too many result sets in ASK result");
Resource r = s.getSubject();
Property p = resultsAsModel.createProperty(ResultSetGraphVocab.getURI() + "boolean");
boolean x = r.getRequiredProperty(p).getBoolean();
if (x != result) assertEquals("ASK test results do not match", x, result);
}
}
return;
}
void runTestDescribe(Query query, QueryExecution qe) throws Exception {
Model resultsActual = qe.execDescribe();
compareGraphResults(resultsActual, query);
}
void runTestConstruct(Query query, QueryExecution qe) throws Exception {
// Do the query!
Model resultsActual = qe.execConstruct();
compareGraphResults(resultsActual, query);
}
/**
* Query SPARQL endpoint with a DESCRIBE query
*
* @param qExec QueryExecution encapsulating the query
* @return model retrieved by querying the endpoint
*/
private Model getDescribeModel(QueryExecution qExec) {
return qExec.execDescribe(ModelFactory.createDefaultModel());
}
/**
* Query SPARQL endpoint with a CONSTRUCT query
*
* @param qExec QueryExecution encapsulating the query
* @return model retrieved by querying the endpoint
*/
private Model getConstructModel(QueryExecution qExec) {
return qExec.execConstruct(ModelFactory.createDefaultModel());
}
/**
* Starts a harvester with predefined queries to synchronize with the changes from the SPARQL
* endpoint
*/
public boolean sync() {
logger.info("Sync resources newer than {}", startTime);
String rdfQueryTemplate =
"PREFIX xsd:<http://www.w3.org/2001/XMLSchema#> "
+ "SELECT DISTINCT ?resource WHERE { "
+ " GRAPH ?graph { %s }"
+ " ?graph <%s> ?time . %s "
+ " FILTER (?time > xsd:dateTime(\"%s\")) }";
String queryStr =
String.format(
rdfQueryTemplate, syncConditions, syncTimeProp, graphSyncConditions, startTime);
Set<String> syncUris = executeSyncQuery(queryStr, "resource");
if (syncUris == null) {
logger.error("Errors occurred during sync procedure. Aborting!");
return false;
}
/**
* If desired, query for old data that has the sync conditions modified
*
* <p>This option is useful in the case in which the application indexes resources that match
* some conditions. In this case, if they are modified and no longer match the initial
* conditions, they will not be synchronized. When syncOldData is True, the modified resources
* that no longer match the conditions are deleted.
*/
int deleted = 0;
int count = 0;
if (this.syncOldData) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
queryStr =
String.format(
rdfQueryTemplate,
syncConditions,
syncTimeProp,
graphSyncConditions,
sdf.format(new Date(0)));
HashSet<String> allIndexURIs = executeSyncQuery(queryStr, "resource");
if (allIndexURIs == null) {
logger.error("Errors occurred during modified content sync query. Aborting!");
return false;
}
deleted = removeMissingUris(allIndexURIs);
}
/* Prepare a series of bulk uris to be described so we can make
* a smaller number of calls to the SPARQL endpoint. */
ArrayList<ArrayList<String>> bulks = new ArrayList<ArrayList<String>>();
ArrayList<String> currentBulk = new ArrayList<String>();
for (String uri : syncUris) {
currentBulk.add(uri);
if (currentBulk.size() == EEASettings.DEFAULT_BULK_SIZE) {
bulks.add(currentBulk);
currentBulk = new ArrayList<String>();
}
}
if (currentBulk.size() > 0) {
bulks.add(currentBulk);
}
/* Execute RDF queries for the resources in each bulk */
for (ArrayList<String> bulk : bulks) {
String syncQuery = getSyncQueryStr(bulk);
try {
Query query = QueryFactory.create(syncQuery);
QueryExecution qExec = QueryExecutionFactory.sparqlService(rdfEndpoint, query);
try {
Model constructModel = ModelFactory.createDefaultModel();
qExec.execConstruct(constructModel);
BulkRequestBuilder bulkRequest = client.prepareBulk();
/**
* When adding the model to ES do not use toDescribeURIs as the query already returned the
* correct labels.
*/
addModelToES(constructModel, bulkRequest, false);
count += bulk.size();
} catch (Exception e) {
logger.error("Error while querying for modified content. {}", e.getLocalizedMessage());
return false;
} finally {
qExec.close();
}
} catch (QueryParseException qpe) {
logger.warn(
"Could not parse Sync query. Please provide a relevant query. {}",
qpe.getLocalizedMessage());
return false;
}
}
logger.info(
"Finished synchronisation: Deleted {}, Updated {}/{}", deleted, count, syncUris.size());
return true;
}
