test/jdk/java/text/Format/DateFormat/Bug4407042.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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/**
 * @test
 * @bug 4407042
 * @summary Make sure that cloned SimpleDateFormat objects work
 * independently in multiple threads.
 * @library /java/text/testlib
 * @run main Bug4407042 10
 */

import java.io.*;
import java.text.*;
import java.util.*;

// Usage: java Bug4407042 [duration]
public class Bug4407042 {

    static final String TIME_STRING = "2000/11/18 00:01:00";
    static final long UTC_LONG = 974534460000L;
    static SimpleDateFormat masterFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    static boolean runrun = true;
    static int duration = 100;

    void test() {
        Locale locale = Locale.getDefault();
        if (!TestUtils.usesAsciiDigits(locale)
                || !TestUtils.usesGregorianCalendar(locale)) {
            System.out.println("Skipping this test because locale is " + locale);
            return;
        }

        masterFormat.setTimeZone(TimeZone.getTimeZone("America/Los_Angeles"));
        DateParseThread d1 = new DateParseThread();
        DateFormatThread d2 = new DateFormatThread();
        d1.start();
        d2.start();
        int n = Thread.activeCount();
        boolean failed = false;

        for (int i = 0; i < duration; i++) {
            try {
                Thread.sleep(1000);
                if (Thread.activeCount() != n) {
                    failed = true;
                    break;
                }
            } catch (InterruptedException e) {
            }
        }
        runrun = false;
        try {
            d1.join();
            d2.join();
        } catch (InterruptedException e) {
        }
        if (failed) {
            throw new RuntimeException("Failed");
        }
    }

    synchronized static SimpleDateFormat getFormatter() {
        return (SimpleDateFormat) masterFormat.clone();
    }

    static class DateParseThread extends Thread {
        public void run() {
            SimpleDateFormat sdf = getFormatter();
            Calendar cal = null;

            try {
                int i = 0;
                while (runrun) {
                    Date date =sdf.parse(TIME_STRING);
                    long t = date.getTime();
                    i++;
                    if (t != UTC_LONG) {
                        throw new RuntimeException("Parse Error: " + i +
                                                   " (" + sdf.format(date) + ") " + t +
                                                   " != " + UTC_LONG);
                    }
                }
            } catch (ParseException e) {
                e.printStackTrace();
                throw new RuntimeException("Parse Error");
            }
        }
    }

    static class DateFormatThread extends Thread {
        public  void run () {
            SimpleDateFormat sdf = getFormatter();
            Calendar cal = null;

            int i = 0;
            while (runrun) {
                i++;
                String s = sdf.format(new Date(UTC_LONG));
                if (!s.equals(TIME_STRING)) {
                    throw new RuntimeException("Format Error: " + i + " " +
                                               s + " != " + TIME_STRING);
                }
            }
        }
    }

    public static void main (String[] args) {
        if (args.length == 1) {
            duration = Math.max(10, Integer.parseInt(args[0]));
        }
        new Bug4407042().test();
    }
}