/*

 * 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

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 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Written by Doug Lea 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/

 * Other contributors include Andrew Wright, Jeffrey Hayes,

 * Pat Fisher, Mike Judd.

 */

import java.util.concurrent.atomic.AtomicBoolean;

import junit.framework.Test;

import junit.framework.TestSuite;

public class AtomicBooleanTest extends JSR166TestCase {

    public static void main(String[] args) {

        main(suite(), args);

    }

    public static Test suite() {

        return new TestSuite(AtomicBooleanTest.class);

    }

    /**

     * constructor initializes to given value

     */

    public void testConstructor() {

        assertTrue(new AtomicBoolean(true).get());

        assertFalse(new AtomicBoolean(false).get());

    }

    /**

     * default constructed initializes to false

     */

    public void testConstructor2() {

        AtomicBoolean ai = new AtomicBoolean();

        assertFalse(ai.get());

    }

    /**

     * get returns the last value set

     */

    public void testGetSet() {

        AtomicBoolean ai = new AtomicBoolean(true);

        assertTrue(ai.get());

        ai.set(false);

        assertFalse(ai.get());

        ai.set(true);

        assertTrue(ai.get());

    }

    /**

     * get returns the last value lazySet in same thread

     */

    public void testGetLazySet() {

        AtomicBoolean ai = new AtomicBoolean(true);

        assertTrue(ai.get());

        ai.lazySet(false);

        assertFalse(ai.get());

        ai.lazySet(true);

        assertTrue(ai.get());

    }

    /**

     * compareAndSet succeeds in changing value if equal to expected else fails

     */

    public void testCompareAndSet() {

        AtomicBoolean ai = new AtomicBoolean(true);

        assertTrue(ai.compareAndSet(true, false));

        assertFalse(ai.get());

        assertTrue(ai.compareAndSet(false, false));

        assertFalse(ai.get());

        assertFalse(ai.compareAndSet(true, false));

        assertFalse(ai.get());

        assertTrue(ai.compareAndSet(false, true));

        assertTrue(ai.get());

    }

    /**

     * compareAndSet in one thread enables another waiting for value

     * to succeed

     */

    public void testCompareAndSetInMultipleThreads() throws Exception {

        final AtomicBoolean ai = new AtomicBoolean(true);

        Thread t = new Thread(new CheckedRunnable() {

            public void realRun() {

                while (!ai.compareAndSet(false, true)) Thread.yield();

            }});

        t.start();

        assertTrue(ai.compareAndSet(true, false));

        t.join(LONG_DELAY_MS);

        assertFalse(t.isAlive());

    }

    /**

     * repeated weakCompareAndSet succeeds in changing value when equal

     * to expected

     */

    public void testWeakCompareAndSet() {

        AtomicBoolean ai = new AtomicBoolean(true);

        do {} while (!ai.weakCompareAndSet(true, false));

        assertFalse(ai.get());

        do {} while (!ai.weakCompareAndSet(false, false));

        assertFalse(ai.get());

        do {} while (!ai.weakCompareAndSet(false, true));

        assertTrue(ai.get());

    }

    /**

     * getAndSet returns previous value and sets to given value

     */

    public void testGetAndSet() {

        AtomicBoolean ai = new AtomicBoolean();

        boolean[] booleans = { false, true };

        for (boolean before : booleans)

            for (boolean after : booleans) {

                ai.set(before);

                assertEquals(before, ai.getAndSet(after));

                assertEquals(after, ai.get());

            }

    }

    /**

     * a deserialized serialized atomic holds same value

     */

    public void testSerialization() throws Exception {

        AtomicBoolean x = new AtomicBoolean();

        AtomicBoolean y = serialClone(x);

        x.set(true);

        AtomicBoolean z = serialClone(x);

        assertTrue(x.get());

        assertFalse(y.get());

        assertTrue(z.get());

    }

    /**

     * toString returns current value.

     */

    public void testToString() {

        AtomicBoolean ai = new AtomicBoolean();

        assertEquals(Boolean.toString(false), ai.toString());

        ai.set(true);

        assertEquals(Boolean.toString(true), ai.toString());

    }

}