89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.reflect.Proxy;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Phaser;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* @test
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* @bug 8174729
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* @summary Proxy.getProxyClass() / Proxy.isProxyClass() race detector
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* @run main ProxyRace
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* @author plevart
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*/
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public class ProxyRace {
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static final int threads = 8;
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static volatile ClassLoader classLoader;
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static volatile boolean terminate;
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static final AtomicInteger racesDetected = new AtomicInteger();
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public static void main(String[] args) throws Exception {
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Phaser phaser = new Phaser(threads) {
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@Override
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protected boolean onAdvance(int phase, int registeredParties) {
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// install new ClassLoader on each advance
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classLoader = new CL();
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return terminate;
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}
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};
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ExecutorService exe = Executors.newFixedThreadPool(threads);
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for (int i = 0; i < threads; i++) {
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exe.execute(() -> {
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while (phaser.arriveAndAwaitAdvance() >= 0) {
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Class<?> proxyClass = Proxy.getProxyClass(classLoader, Runnable.class);
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if (!Proxy.isProxyClass(proxyClass)) {
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racesDetected.incrementAndGet();
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}
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}
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});
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}
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Thread.sleep(5000L);
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terminate = true;
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exe.shutdown();
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exe.awaitTermination(5L, TimeUnit.SECONDS);
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System.out.println(racesDetected.get() + " races detected");
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if (racesDetected.get() != 0) {
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throw new RuntimeException(racesDetected.get() + " races detected");
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}
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}
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static class CL extends ClassLoader {
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public CL() {
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super(ClassLoader.getSystemClassLoader());
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}
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}
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}
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