/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dev ;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.apache.jena.larq.IndexBuilderString;
import org.apache.jena.larq.IndexLARQ;
import org.apache.jena.larq.LARQ;
import org.apache.log4j.Logger;
import org.apache.lucene.queryParser.ParseException;
import org.junit.Test;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.shared.Lock;
public class Report_LARQ_Concurrent {
static final int numThreads = 2;
static final long duration = 2;
long startTime = System.currentTimeMillis();
long endTime;
Model model;
@Test
public void test_concurrent_larq_query() throws ParseException, InterruptedException, ExecutionException {
endTime = startTime + duration * 1000;
model = ModelFactory.createDefaultModel();
IndexBuilderString larqBuilder = new IndexBuilderString() ;
IndexLARQ index = larqBuilder.getIndex() ;
LARQ.setDefaultIndex(index) ;
ExecutorService executorService = Executors.newCachedThreadPool();
Future<?>[] future = new Future<?>[numThreads];
for (int t=0; t<numThreads; t++) {
future[t]= executorService.submit(new R());
}
try {
executorService.awaitTermination(duration + 2, TimeUnit.SECONDS);
} catch (InterruptedException e) {
logger.info("main thread interupted");
}
// make sure everything is stopped - as best we can
executorService.shutdownNow();
for (int t=0; t<numThreads; t++) {
future[t].get();
}
}
class R implements Runnable {
final String queryString =
"PREFIX pf: <http://jena.hpl.hp.com/ARQ/property#>\n" +
"SELECT ?doc ?score\n" +
"WHERE {\n" +
" (?lit ?score ) pf:textMatch '+text' .\n" +
" ?doc ?p ?lit\n" +
"}\n";
//@Override
public void run() {
while (System.currentTimeMillis() < endTime) {
model.enterCriticalSection(Lock.READ);
try {
Query query = QueryFactory.create(queryString) ;
QueryExecution qExec = QueryExecutionFactory.create(query, model) ;
ResultSet resultSet = qExec.execSelect();
while (resultSet.hasNext()) {
resultSet.next();
}
} finally {
model.leaveCriticalSection();
}
}
}
}
private static Logger logger = Logger.getLogger(Report_LARQ_Concurrent.class);
}