| /* |
| * Copyright (c) 2017, 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. |
| */ |
| |
| import java.lang.reflect.Proxy; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Phaser; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * @test |
| * @bug 8174729 |
| * @summary Proxy.getProxyClass() / Proxy.isProxyClass() race detector |
| * @run main ProxyRace |
| * @author plevart |
| */ |
| |
| public class ProxyRace { |
| |
| static final int threads = 8; |
| |
| static volatile ClassLoader classLoader; |
| static volatile boolean terminate; |
| static final AtomicInteger racesDetected = new AtomicInteger(); |
| |
| public static void main(String[] args) throws Exception { |
| |
| Phaser phaser = new Phaser(threads) { |
| @Override |
| protected boolean onAdvance(int phase, int registeredParties) { |
| // install new ClassLoader on each advance |
| classLoader = new CL(); |
| return terminate; |
| } |
| }; |
| |
| ExecutorService exe = Executors.newFixedThreadPool(threads); |
| |
| for (int i = 0; i < threads; i++) { |
| exe.execute(() -> { |
| while (phaser.arriveAndAwaitAdvance() >= 0) { |
| Class<?> proxyClass = Proxy.getProxyClass(classLoader, Runnable.class); |
| if (!Proxy.isProxyClass(proxyClass)) { |
| racesDetected.incrementAndGet(); |
| } |
| } |
| }); |
| } |
| |
| Thread.sleep(5000L); |
| |
| terminate = true; |
| exe.shutdown(); |
| exe.awaitTermination(5L, TimeUnit.SECONDS); |
| |
| System.out.println(racesDetected.get() + " races detected"); |
| if (racesDetected.get() != 0) { |
| throw new RuntimeException(racesDetected.get() + " races detected"); |
| } |
| } |
| |
| static class CL extends ClassLoader { |
| public CL() { |
| super(ClassLoader.getSystemClassLoader()); |
| } |
| } |
| } |