/*

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug 6725789

 * @summary Check for long overflow in task time comparison.

 */

import java.util.concurrent.*;

public class DelayOverflow {

    static void waitForNanoTimeTick() {

        for (long t0 = System.nanoTime(); t0 == System.nanoTime(); )

            ;

    }

    void scheduleNow(ScheduledThreadPoolExecutor pool,

                     Runnable r, int how) {

        switch (how) {

        case 0:

            pool.schedule(r, 0, TimeUnit.MILLISECONDS);

            break;

        case 1:

            pool.schedule(Executors.callable(r), 0, TimeUnit.DAYS);

            break;

        case 2:

            pool.scheduleWithFixedDelay(r, 0, 1000, TimeUnit.NANOSECONDS);

            break;

        case 3:

            pool.scheduleAtFixedRate(r, 0, 1000, TimeUnit.MILLISECONDS);

            break;

        default:

            fail(String.valueOf(how));

        }

    }

    void scheduleAtTheEndOfTime(ScheduledThreadPoolExecutor pool,

                                Runnable r, int how) {

        switch (how) {

        case 0:

            pool.schedule(r, Long.MAX_VALUE, TimeUnit.MILLISECONDS);

            break;

        case 1:

            pool.schedule(Executors.callable(r), Long.MAX_VALUE, TimeUnit.DAYS);

            break;

        case 2:

            pool.scheduleWithFixedDelay(r, Long.MAX_VALUE, 1000, TimeUnit.NANOSECONDS);

            break;

        case 3:

            pool.scheduleAtFixedRate(r, Long.MAX_VALUE, 1000, TimeUnit.MILLISECONDS);

            break;

        default:

            fail(String.valueOf(how));

        }

    }

    /**

     * Attempts to test exhaustively and deterministically, all 20

     * possible ways that one task can be scheduled in the maximal

     * distant future, while at the same time an existing tasks's time

     * has already expired.

     */

    void test(String[] args) throws Throwable {

        for (int nowHow = 0; nowHow < 4; nowHow++) {

            for (int thenHow = 0; thenHow < 4; thenHow++) {

                final ScheduledThreadPoolExecutor pool

                    = new ScheduledThreadPoolExecutor(1);

                final CountDownLatch runLatch     = new CountDownLatch(1);

                final CountDownLatch busyLatch    = new CountDownLatch(1);

                final CountDownLatch proceedLatch = new CountDownLatch(1);

                final Runnable notifier = new Runnable() {

                        public void run() { runLatch.countDown(); }};

                final Runnable neverRuns = new Runnable() {

                        public void run() { fail(); }};

                final Runnable keepPoolBusy = new Runnable() {

                        public void run() {

                            try {

                                busyLatch.countDown();

                                proceedLatch.await();

                            } catch (Throwable t) { unexpected(t); }

                        }};

                pool.schedule(keepPoolBusy, 0, TimeUnit.SECONDS);

                busyLatch.await();

                scheduleNow(pool, notifier, nowHow);

                waitForNanoTimeTick();

                scheduleAtTheEndOfTime(pool, neverRuns, thenHow);

                proceedLatch.countDown();

                check(runLatch.await(10L, TimeUnit.SECONDS));

                equal(runLatch.getCount(), 0L);

                pool.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);

                pool.shutdown();

            }

            final int nowHowCopy = nowHow;

            final ScheduledThreadPoolExecutor pool

                = new ScheduledThreadPoolExecutor(1);

            final CountDownLatch runLatch = new CountDownLatch(1);

            final Runnable notifier = new Runnable() {

                    public void run() { runLatch.countDown(); }};

            final Runnable scheduleNowScheduler = new Runnable() {

                    public void run() {

                        try {

                            scheduleNow(pool, notifier, nowHowCopy);

                            waitForNanoTimeTick();

                        } catch (Throwable t) { unexpected(t); }

                    }};

            pool.scheduleWithFixedDelay(scheduleNowScheduler,

                                        0, Long.MAX_VALUE,

                                        TimeUnit.NANOSECONDS);

            check(runLatch.await(10L, TimeUnit.SECONDS));

            equal(runLatch.getCount(), 0L);

            pool.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);

            pool.shutdown();

        }

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

    public static void main(String[] args) throws Throwable {

        Class<?> k = new Object(){}.getClass().getEnclosingClass();

        try {k.getMethod("instanceMain",String[].class)

                .invoke( k.newInstance(), (Object) args);}

        catch (Throwable e) {throw e.getCause();}}

    public void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}