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/*
* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8019623
* @summary Tests that AppContext.getAppContext() works correctly in multi-threads scenario.
* @author Leonid Romanov
* @modules java.desktop/sun.awt
*/
import sun.awt.AppContext;
public class MultiThreadTest {
private static final int NUM_THREADS = 2;
private static AppContextGetter[] getters = new AppContextGetter[NUM_THREADS];
public static void main(String[] args) {
createAndStartThreads();
compareAppContexts();
}
private static void createAndStartThreads() {
ThreadGroup systemGroup = getSystemThreadGroup();
for (int i = 0; i < NUM_THREADS; ++i) {
ThreadGroup tg = new ThreadGroup(systemGroup, "AppContextGetter" + i);
getters[i] = new AppContextGetter(tg);
}
for (int i = 0; i < NUM_THREADS; ++i) {
getters[i].start();
}
for (int i = 0; i < NUM_THREADS; ++i) {
try {
getters[i].join();
} catch (InterruptedException e) {
// ignore
}
}
}
private static ThreadGroup getSystemThreadGroup() {
ThreadGroup currentThreadGroup =
Thread.currentThread().getThreadGroup();
ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
while (parentThreadGroup != null) {
currentThreadGroup = parentThreadGroup;
parentThreadGroup = currentThreadGroup.getParent();
}
return currentThreadGroup;
}
private static void compareAppContexts() {
AppContext ctx = getters[0].getAppContext();
for (int i = 1; i < NUM_THREADS; ++i) {
if (!ctx.equals(getters[i].getAppContext())) {
throw new RuntimeException("Unexpected AppContexts difference, could be a race condition");
}
}
}
private static class AppContextGetter extends Thread {
private AppContext appContext;
public AppContextGetter(ThreadGroup tg) {
super(tg, tg.getName());
}
AppContext getAppContext() {
return appContext;
}
@Override
public void run() {
appContext = AppContext.getAppContext();
}
}
}
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