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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cayenne.access;
import static org.junit.Assert.assertFalse;
import java.util.List;
import java.util.Random;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.configuration.server.ServerRuntime;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.query.SelectQuery;
import org.apache.cayenne.test.jdbc.DBHelper;
import org.apache.cayenne.test.jdbc.TableHelper;
import org.apache.cayenne.test.parallel.ParallelTestContainer;
import org.apache.cayenne.testdo.testmap.Artist;
import org.apache.cayenne.unit.di.server.CayenneProjects;
import org.apache.cayenne.unit.di.server.ServerCase;
import org.apache.cayenne.unit.di.server.UseServerRuntime;
import org.junit.Before;
import org.junit.Test;
@UseServerRuntime(CayenneProjects.TESTMAP_PROJECT)
public class NestedDataContext_DeadlockIT extends ServerCase {
@Inject
private DataContext parent;
@Inject
private ServerRuntime runtime;
@Inject
protected DBHelper dbHelper;
protected TableHelper tArtist;
@Before
public void setUp() throws Exception {
tArtist = new TableHelper(dbHelper, "ARTIST");
tArtist.setColumns("ARTIST_ID", "ARTIST_NAME");
}
private void createArtists() throws Exception {
for (int i = 0; i < 300; i++) {
tArtist.insert(i + 1, "X" + i);
}
}
@Test
public void testDeadlock() throws Exception {
createArtists();
final Thread[] threads = new Thread[2];
Random rnd = new Random(System.currentTimeMillis());
for (int i = 0; i < threads.length; i++) {
threads[i] = new UpdateThread("UpdateThread-" + i, runtime.newContext(parent), rnd);
}
for (Thread thread : threads) {
thread.start();
}
new ParallelTestContainer() {
@Override
protected void assertResult() throws Exception {
for (Thread thread : threads) {
// unfortunately here we'll have to leave some dead threads
// behind... Of course if there's no deadlock, there won't
// be a leak either
assertFalse("Deadlocked thread", thread.isAlive());
}
}
}.runTest(40000);
}
static class UpdateThread extends Thread {
protected ObjectContext nestedContext;
protected Random rnd;
UpdateThread(String name, ObjectContext nestedContext, Random rnd) {
super(name);
setDaemon(true);
this.nestedContext = nestedContext;
this.rnd = rnd;
}
@Override
public void run() {
List<Artist> artists = nestedContext.select(new SelectQuery<Artist>(Artist.class));
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 5; j++) {
int index = rnd.nextInt(artists.size());
Artist a = artists.get(index);
a.setArtistName("Y" + rnd.nextInt());
}
nestedContext.commitChanges();
// ensure other threads get a chance to run too
Thread.yield();
}
}
}
}