author | rriggs |
Fri, 11 Oct 2019 13:11:56 -0400 | |
changeset 58565 | baa5969ecf34 |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2019, 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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/* @test |
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* @summary Verify that concurrent class descriptor lookups function properly, |
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* even when class descriptor initialization is slow or throws an |
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* exception. |
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*/ |
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import java.io.*; |
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class Good implements Serializable { |
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private static final long serialVersionUID = 6319710844400051132L; |
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static { |
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try { Thread.sleep(1000); } catch (InterruptedException ex) {} |
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} |
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} |
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class Bad implements Serializable { |
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// explicit suid triggers class initialization during classdesc lookup |
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private static final long serialVersionUID = 0xBAD; |
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static { |
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try { Thread.sleep(1000); } catch (InterruptedException ex) {} |
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if ("foo".equals("foo")) { |
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throw new RuntimeException(); |
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} |
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} |
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} |
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class SuccessfulLookup extends Thread { |
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Class<?> cl; |
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long suid; |
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Object barrier; |
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boolean ok; |
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SuccessfulLookup(Class<?> cl, long suid, Object barrier) { |
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this.cl = cl; |
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this.suid = suid; |
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this.barrier = barrier; |
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} |
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public void run() { |
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synchronized (barrier) { |
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try { barrier.wait(); } catch (InterruptedException ex) {} |
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} |
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for (int i = 0; i < 100; i++) { |
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if (ObjectStreamClass.lookup(cl).getSerialVersionUID() != suid) { |
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return; |
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} |
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} |
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ok = true; |
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} |
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} |
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class FailingLookup extends Thread { |
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Class<?> cl; |
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final Object barrier; |
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boolean ok; |
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FailingLookup(Class<?> cl, Object barrier) { |
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this.cl = cl; |
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this.barrier = barrier; |
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} |
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public void run() { |
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synchronized (barrier) { |
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try { barrier.wait(); } catch (InterruptedException ex) {} |
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} |
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for (int i = 0; i < 100; i++) { |
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try { |
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ObjectStreamClass.lookup(cl); |
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return; |
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} catch (Throwable th) { |
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} |
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} |
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ok = true; |
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} |
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} |
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public class ConcurrentClassDescLookup { |
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public static void main(String[] args) throws Exception { |
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ClassLoader loader = ConcurrentClassDescLookup.class.getClassLoader(); |
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Class<?> cl = Class.forName("Good", false, loader); |
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Object barrier = new Object(); |
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SuccessfulLookup[] slookups = new SuccessfulLookup[50]; |
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for (int i = 0; i < slookups.length; i++) { |
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slookups[i] = |
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new SuccessfulLookup(cl, 6319710844400051132L, barrier); |
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slookups[i].start(); |
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} |
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Thread.sleep(1000); |
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synchronized (barrier) { |
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barrier.notifyAll(); |
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} |
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for (int i = 0; i < slookups.length; i++) { |
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slookups[i].join(); |
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if (!slookups[i].ok) { |
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throw new Error(); |
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} |
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} |
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cl = Class.forName("Bad", false, loader); |
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FailingLookup[] flookups = new FailingLookup[50]; |
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for (int i = 0; i < flookups.length; i++) { |
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flookups[i] = new FailingLookup(cl, barrier); |
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flookups[i].start(); |
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} |
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Thread.sleep(1000); |
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synchronized (barrier) { |
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barrier.notifyAll(); |
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} |
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for (int i = 0; i < slookups.length; i++) { |
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flookups[i].join(); |
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if (!flookups[i].ok) { |
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throw new Error(); |
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} |
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} |
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} |
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} |