/*****************************************************************
* 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 org.apache.cayenne.dba;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.cayenne.Cayenne;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.configuration.server.ServerRuntime;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.query.SelectQuery;
import org.apache.cayenne.testdo.qualified.Qualified1;
import org.apache.cayenne.unit.di.server.ServerCase;
import org.apache.cayenne.unit.di.server.UseServerRuntime;
@UseServerRuntime("cayenne-default.xml")
public class ConcurrentPkGeneratorTest extends ServerCase {
@Inject
private ServerRuntime runtime;
/*
* Attempts to discover any problems regarding thread locking in the PkGenerator
*/
public void testConcurrentInserts() throws Exception {
final DataMap dataMap = runtime.getDataDomain().getDataMap("qualified");
// clear out the table
ObjectContext context = runtime.newContext();
List<Qualified1> qualified1s = context.select(SelectQuery.query(Qualified1.class, null));
context.deleteObjects(qualified1s);
context.commitChanges();
// perform concurrent inserts
int numThreads = 2;
ExecutorService executor = Executors.newFixedThreadPool(numThreads);
Runnable task = new Runnable() {
public void run() {
try {
ObjectContext context = runtime.newContext();
for (ObjEntity entity : dataMap.getObjEntities()) {
context.newObject(entity.getJavaClass());
}
context.commitChanges();
} catch (Exception e) {
e.printStackTrace();
}
}
};
for (int j = 0; j < 100; j++) {
for (int i = 0; i < numThreads; i++) {
executor.submit(task);
}
}
// check for completion or deadlock
executor.shutdown();
try {
// normally this completes in less than 2 seconds. If it takes 30 then it failed.
boolean didFinish = executor.awaitTermination(30, TimeUnit.SECONDS);
if (!didFinish) {
fail("Concurrent inserts either deadlocked or contended over the lock too long.");
}
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
// check for gaps in the generated sequence numbers
qualified1s = context.select(SelectQuery.query(Qualified1.class, null));
assertEquals(100 * numThreads, qualified1s.size());
Collections.sort(qualified1s, new Comparator<Qualified1>() {
public int compare(Qualified1 left, Qualified1 right) {
Integer leftPk = Cayenne.intPKForObject(left);
Integer rightPk = Cayenne.intPKForObject(right);
return leftPk.compareTo(rightPk);
}
});
// PKs will be used in order most of the time, but the implementation doesn't guarantee it.
// int lastPk = Cayenne.intPKForObject(qualified1s.get(0)) - 1;
// for (Qualified1 qualified1 : qualified1s) {
// if (lastPk+1 != Cayenne.intPKForObject(qualified1)) {
// fail("Found gap in sequence number: " + lastPk + " - " + Cayenne.intPKForObject(qualified1));
// }
// lastPk++;
// }
}
}