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Java example source code file (Bug7017458.java)

This example Java source code file (Bug7017458.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bug7017458, bytearrayinputstream, bytearrayoutputstream, calendar, deserializationthread, exception, multithreaded, objectinputstream, objectoutputstream, runtimeexception, serializationthread, util

The Bug7017458.java Java example source code

/*
 * Copyright (c) 2012, 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 7017458
 * @summary Test of multithreaded serialization/deserialization of Calendar.
 */

import java.io.*;
import java.util.Calendar;

public class Bug7017458 {

    static volatile boolean err = false;

    public static void main(String[] args) {
        try {
            new Bug7017458().perform();
        }
        catch (Exception e) {
            e.printStackTrace();
            err = true;
        }

        if (err) {
            throw new RuntimeException("Multithreaded serialization/deserialization test failed.");
        } else {
            System.out.println("Multithreaded serialization/deserialization test passed.");
        }
    }

    public void perform() throws Exception {
        int nbThreads = 8;
        Calendar cal = Calendar.getInstance();
        SerializationThread[] threads = new SerializationThread[nbThreads];
        for (int i = 0; i < nbThreads; i++) {
            threads[i] = new SerializationThread(cal);
        }
        for (int i = 0; i < nbThreads; i++) {
            threads[i].start();
        }
        for (int i = 0; i < nbThreads; i++) {
            threads[i].join();
        }

        DeserializationThread[] threads2 = new DeserializationThread[nbThreads];
        for (int i = 0; i < nbThreads; i++) {
            threads2[i] = new DeserializationThread(threads[i].data);
        }
        for (int i = 0; i < nbThreads; i++) {
            threads2[i].start();
        }
        for (int i = 0; i < nbThreads; i++) {
            threads2[i].join();
        }
    }

    public class SerializationThread extends Thread {
        private Calendar cal;
        public byte[] data;

        public SerializationThread(Calendar cal) {
            this.cal = cal;
        }

        public void run() {
            try {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(baos);
                oos.writeObject(cal);
                oos.flush();
                oos.close();
                data = baos.toByteArray();
                }
            catch (Exception e) {
                e.printStackTrace();
                err = true;
            }
        }
    }

    public class DeserializationThread extends Thread {
        public Calendar cal;
        public byte[] data;

        public DeserializationThread(byte[] data) {
            this.data = data;
        }

        public void run() {
            try {
                ByteArrayInputStream bais = new ByteArrayInputStream(data);
                ObjectInputStream ois = new ObjectInputStream(bais);
                cal = (Calendar) ois.readObject();
                ois.close();
            }
            catch (Exception e) {
                e.printStackTrace();
                err = true;
            }
        }
    }
}

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