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/*
* 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.
*/
/*
* 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/reserialized 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());
}
}
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