/******************************************************************************* | |
* Copyright (c) 2011, 2013 Oracle and/or its affiliates. All rights reserved. | |
* This program and the accompanying materials are made available under the | |
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* James Sutherland - initial implementation | |
******************************************************************************/ | |
package org.eclipse.persistence.testing.tests.clientserver; | |
import java.util.List; | |
import java.util.Random; | |
import org.eclipse.persistence.testing.framework.*; | |
import org.eclipse.persistence.sessions.*; | |
import org.eclipse.persistence.testing.models.employee.domain.*; | |
/** | |
* This test attempts to cause a database deadlock by updates the same | |
* set of objects in a transaction on multiple threads. | |
* If the updates are ordered randomly, this can cause a deadlock. | |
* @author James Sutherland | |
*/ | |
public class ClientServerUpdateDeadlockTest extends TestCase { | |
protected DatabaseLogin login; | |
protected UpdateDeadlockClient[] clients; | |
protected Server server; | |
public static int NUM_CLIENTS = 15; | |
protected class UpdateDeadlockClient extends Thread { | |
protected int index; | |
protected Server server; | |
protected Session clientSession; | |
protected Session session; | |
public Throwable exception; | |
public UpdateDeadlockClient(Server server, Session session, String name, int index) { | |
super(name); | |
this.index = index; | |
this.server = server; | |
this.session = session; | |
this.clientSession = this.server.serverSession.acquireClientSession(); | |
} | |
public void release() { | |
this.clientSession.release(); | |
} | |
@Override | |
public void run() { | |
try { | |
for (int index = 0; index < 5; index++) { | |
UnitOfWork uow = this.clientSession.acquireUnitOfWork(); | |
uow.setShouldOrderUpdates(true); | |
List<Address> addresses = uow.readAllObjects(Address.class); | |
Random random = new Random(); | |
for (Address address : addresses) { | |
if (random.nextBoolean()) { | |
address.setCity(getName() + index); | |
} | |
} | |
uow.commit(); | |
} | |
} catch (Throwable t) { | |
t.printStackTrace(); | |
exception = t; | |
} | |
} | |
} | |
public ClientServerUpdateDeadlockTest() { | |
this.clients = new UpdateDeadlockClient[NUM_CLIENTS]; | |
setDescription("Tests running a number of threads updating the same employees."); | |
} | |
@Override | |
public void setup() { | |
this.login = (DatabaseLogin)getSession().getLogin().clone(); | |
this.server = new Server(this.login); | |
this.server.serverSession.setSessionLog(getSession().getSessionLog()); | |
this.server.login(); | |
this.server.copyDescriptors(getSession()); | |
for (int index = 0; index < NUM_CLIENTS; index++) { | |
clients[index] = new UpdateDeadlockClient(this.server, getSession(), "Client" + index, index); | |
} | |
} | |
@Override | |
public void reset() { | |
for (int i = 0; i < NUM_CLIENTS; i++) { | |
this.clients[i].release(); | |
} | |
this.server.logout(); | |
getDatabaseSession().logout(); | |
getDatabaseSession().login(); | |
} | |
@Override | |
public void test() { | |
for (int i = 0; i < NUM_CLIENTS; i++) { | |
this.clients[i].start(); | |
} | |
try { | |
for (int i = 0; i < NUM_CLIENTS; i++) { | |
this.clients[i].join(); | |
} | |
} catch (InterruptedException ex) { | |
} | |
} | |
/** | |
* Check if any errors occurred. | |
*/ | |
@Override | |
public void verify() { | |
for (int i = 0; i < NUM_CLIENTS; i++) { | |
if (this.clients[i].exception != null) { | |
throw new TestErrorException("Error occurred, check system.out"); | |
} | |
} | |
} | |
} |