109 lines
4.0 KiB
Java
109 lines
4.0 KiB
Java
/*
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* Copyright (c) 2007, 2023, 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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/*
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* @test
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* @bug 4518797
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* @summary Make sure that hashCode() and read/writeObject() are thread-safe.
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* @run main HashCodeShouldBeThreadSafe 10
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*/
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.util.Locale;
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// Usage: java HashCodeShouldBeThreadSafe [duration]
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public class HashCodeShouldBeThreadSafe {
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static volatile boolean runrun = true;
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static volatile String message = null;
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public static void main(String[] args) {
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int duration = 180;
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if (args.length == 1) {
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duration = Math.max(5, Integer.parseInt(args[0]));
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}
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final Locale loc = Locale.of("ja", "US");
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final int hashcode = loc.hashCode();
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System.out.println("correct hash code: " + hashcode);
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Thread t1 = new Thread(new Runnable() {
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public void run() {
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while (runrun) {
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int hc = loc.hashCode();
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if (hc != hashcode) {
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runrun = false;
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message = "t1: wrong hashcode: " + hc;
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}
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}
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}
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});
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Thread t2 = new Thread(new Runnable() {
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public void run() {
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// Repeat serialization and deserialization. And get the
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// hash code from a deserialized Locale object.
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while (runrun) {
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try {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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ObjectOutputStream oos = new ObjectOutputStream(baos);
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oos.writeObject(loc);
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byte[] b = baos.toByteArray();
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oos.close();
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ByteArrayInputStream bais = new ByteArrayInputStream(b);
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ObjectInputStream ois = new ObjectInputStream(bais);
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Locale loc2 = (Locale) ois.readObject();
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int hc = loc2.hashCode();
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if (hc != hashcode) {
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runrun = false;
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message = "t2: wrong hashcode: " + hc;
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}
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} catch (IOException ioe) {
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runrun = false;
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throw new RuntimeException("t2: can't perform test", ioe);
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} catch (ClassNotFoundException cnfe) {
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runrun = false;
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throw new RuntimeException("t2: can't perform test", cnfe);
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}
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}
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}
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});
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t1.start();
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t2.start();
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try {
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for (int i = 0; runrun && i < duration; i++) {
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Thread.sleep(1000);
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}
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runrun = false;
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t1.join();
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t2.join();
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} catch (InterruptedException e) {
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}
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if (message != null) {
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throw new RuntimeException(message);
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}
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}
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}
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