/**
* 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;
}
/**
* 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;
}