/*

 * 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.

 */

/*

 * Written by Martin Buchholz with assistance from members of JCP JSR-166

 * Expert Group and released to the public domain, as explained at

 * http://creativecommons.org/publicdomain/zero/1.0/

 */

/*

 * @test

 * @run main DoneTimedGetLoops 300

 * @summary isDone returning true guarantees that subsequent timed get

 * will never throw TimeoutException.

 */

import java.util.*;

import java.util.concurrent.*;

import java.util.concurrent.atomic.*;

@SuppressWarnings({"unchecked", "rawtypes", "deprecation"})

public class DoneTimedGetLoops {

    final long testDurationMillisDefault = 10L * 1000L;

    final long testDurationMillis;

    static class PublicFutureTask extends FutureTask<Boolean> {

        PublicFutureTask() { super(noop, null); }

        public void set(Boolean v) { super.set(v); }

        public void setException(Throwable t) { super.setException(t); }

    }

    DoneTimedGetLoops(String[] args) {

        testDurationMillis = (args.length > 0) ?

            Long.valueOf(args[0]) : testDurationMillisDefault;

    }

    void test(String[] args) throws Throwable {

        final long testDurationNanos = testDurationMillis * 1000L * 1000L;

        final long quittingTimeNanos = System.nanoTime() + testDurationNanos;

        final long timeoutMillis = 10L * 1000L;

        final AtomicReference<PublicFutureTask> normalRef

            = new AtomicReference<PublicFutureTask>();

        final AtomicReference<PublicFutureTask> abnormalRef

            = new AtomicReference<PublicFutureTask>();

        final Throwable throwable = new Throwable();

        abstract class CheckedThread extends Thread {

            CheckedThread(String name) {

                super(name);

                setDaemon(true);

                start();

            }

            /** Polls for quitting time. */

            protected boolean quittingTime() {

                return System.nanoTime() - quittingTimeNanos > 0;

            }

            /** Polls occasionally for quitting time. */

            protected boolean quittingTime(long i) {

                return (i % 1024) == 0 && quittingTime();

            }

            public void run() {

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

            }

        }

        Thread setter = new CheckedThread("setter") {

            protected void realRun() {

                while (! quittingTime()) {

                    PublicFutureTask future = new PublicFutureTask();

                    normalRef.set(future);

                    future.set(Boolean.TRUE);

                }}};

        Thread setterException = new CheckedThread("setterException") {

            protected void realRun() {

                while (! quittingTime()) {

                    PublicFutureTask future = new PublicFutureTask();

                    abnormalRef.set(future);

                    future.setException(throwable);

                }}};

        Thread doneTimedGetNormal = new CheckedThread("doneTimedGetNormal") {

            protected void realRun() throws Exception {

                while (! quittingTime()) {

                    PublicFutureTask future = normalRef.get();

                    if (future != null) {

                        while (!future.isDone())

                            ;

                        check(future.get(0L, TimeUnit.HOURS) == Boolean.TRUE);

                    }}}};

        Thread doneTimedGetAbnormal = new CheckedThread("doneTimedGetAbnormal") {

            protected void realRun() throws Exception {

                while (! quittingTime()) {

                    PublicFutureTask future = abnormalRef.get();

                    if (future != null) {

                        while (!future.isDone())

                            ;

                        try { future.get(0L, TimeUnit.HOURS); fail(); }

                        catch (ExecutionException t) {

                            check(t.getCause() == throwable);

                        }

                    }}}};

        for (Thread thread : new Thread[] {

                 setter,

                 setterException,

                 doneTimedGetNormal,

                 doneTimedGetAbnormal }) {

            thread.join(timeoutMillis + testDurationMillis);

            if (thread.isAlive()) {

                System.err.printf("Hung thread: %s%n", thread.getName());

                failed++;

                for (StackTraceElement e : thread.getStackTrace())

                    System.err.println(e);

                // Kludge alert

                thread.stop();

                thread.join(timeoutMillis);

            }

        }

    }

    //--------------------- 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 {

        new DoneTimedGetLoops(args).instanceMain(args);}

    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");}

}