/**
* 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 com.hp.hpl.jena.tdb.extra;
import java.security.SecureRandom ;
import java.util.Iterator ;
import java.util.concurrent.CountDownLatch ;
import java.util.concurrent.ExecutorService ;
import java.util.concurrent.Executors ;
import java.util.concurrent.atomic.AtomicInteger ;
import org.openjena.atlas.logging.Log ;
import com.hp.hpl.jena.graph.Node ;
import com.hp.hpl.jena.query.ReadWrite ;
import com.hp.hpl.jena.sparql.core.Quad ;
import com.hp.hpl.jena.tdb.StoreConnection ;
import com.hp.hpl.jena.tdb.base.file.Location ;
import com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn ;
import com.hp.hpl.jena.tdb.transaction.TransactionManager ;
public class T_TxnDeadlockTest {
static {
Log.setLog4j() ;
//Log.enable("TDB") ;
if ( false ) Log.enable(TransactionManager.class) ;
//Log.enable(LockMRSW.class) ;
}
private static final int CONCURRENT_RANDOM_OPERATIONS = 1000;
private static final SecureRandom numberGenerator = new SecureRandom();
public static void main(String ... argv)
{
for(int i = 0 ; i < 1000 ; i++ )
{
System.out.println("Loop = "+i) ;
new T_TxnDeadlockTest().test() ;
}
}
//@Test
public void test() {
final StoreConnection storeConnection =
StoreConnection.make(Location.mem());
//ExecutorService executor = Executors.newCachedThreadPool() ; // Not seen blocking.
// 4 blocks maybe 1 in 4 times
// 8 blocks (quad core) 2 in 3 times.
ExecutorService executor = Executors.newFixedThreadPool(8) ;
final AtomicInteger nbQuadruplesAdded = new AtomicInteger();
final CountDownLatch doneSignal =
new CountDownLatch(CONCURRENT_RANDOM_OPERATIONS);
for (int i = 0; i < CONCURRENT_RANDOM_OPERATIONS; i++) {
executor.execute(new Runnable() {
@Override
public void run() {
try {
if (numberGenerator.nextInt(2) == 0) {
DatasetGraphTxn txnGraph =
storeConnection.begin(ReadWrite.WRITE);
txnGraph.add(new Quad(
Node.createURI("http://openjena.org/"
+ numberGenerator.nextInt()),
Node.createURI("http://openjena.org/"
+ numberGenerator.nextInt()),
Node.createURI("http://openjena.org/"
+ numberGenerator.nextInt()),
Node.createURI("http://openjena.org/"
+ numberGenerator.nextInt())));
txnGraph.commit();
txnGraph.end();
nbQuadruplesAdded.incrementAndGet();
} else {
DatasetGraphTxn txnGraph =
storeConnection.begin(ReadWrite.READ);
txnGraph.find(Node.ANY, Node.ANY, Node.ANY, Node.ANY);
//Iterator<Quad> iter = txnGraph.find(Node.ANY, Node.ANY, Node.ANY, Node.ANY);
//Iter.count(iter) ; // Consume
txnGraph.end();
}
} finally {
doneSignal.countDown();
}
}
});
}
// shutdown is orderly so sync'ing up before the shutdown is nice but not needed.
try {
doneSignal.await();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} finally {
executor.shutdown();
}
DatasetGraphTxn txnGraph =
storeConnection.begin(ReadWrite.READ);
Iterator<Quad> result = txnGraph.find(
Node.ANY, Node.ANY, Node.ANY, Node.ANY);
long count = 0;
while (result.hasNext()) {
result.next();
count++;
}
txnGraph.end();
StoreConnection.release(storeConnection.getLocation());
//System.out.println() ;
System.out.println("FINISHED") ;
// // This is unsafe - the quad adds may generate duplicates (ity's unlikly 4 random number reoccur but it's possible).
// Assert.assertEquals(count, nbQuadruplesAdded.get());
}
}