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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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|
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import java.util.concurrent.atomic.AtomicBoolean; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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public class AtomicBooleanTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(AtomicBooleanTest.class); |
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} |
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|
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/** |
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* constructor initializes to given value |
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*/ |
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public void testConstructor() { |
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assertTrue(new AtomicBoolean(true).get()); |
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assertFalse(new AtomicBoolean(false).get()); |
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} |
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|
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/** |
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* default constructed initializes to false |
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*/ |
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public void testConstructor2() { |
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AtomicBoolean ai = new AtomicBoolean(); |
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assertFalse(ai.get()); |
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} |
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|
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/** |
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* get returns the last value set |
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*/ |
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public void testGetSet() { |
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AtomicBoolean ai = new AtomicBoolean(true); |
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assertTrue(ai.get()); |
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ai.set(false); |
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assertFalse(ai.get()); |
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ai.set(true); |
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assertTrue(ai.get()); |
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} |
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|
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/** |
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* get returns the last value lazySet in same thread |
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*/ |
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public void testGetLazySet() { |
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AtomicBoolean ai = new AtomicBoolean(true); |
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assertTrue(ai.get()); |
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ai.lazySet(false); |
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assertFalse(ai.get()); |
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ai.lazySet(true); |
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assertTrue(ai.get()); |
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} |
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|
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/** |
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* compareAndSet succeeds in changing value if equal to expected else fails |
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*/ |
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public void testCompareAndSet() { |
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AtomicBoolean ai = new AtomicBoolean(true); |
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assertTrue(ai.compareAndSet(true, false)); |
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assertFalse(ai.get()); |
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assertTrue(ai.compareAndSet(false, false)); |
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assertFalse(ai.get()); |
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assertFalse(ai.compareAndSet(true, false)); |
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assertFalse(ai.get()); |
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assertTrue(ai.compareAndSet(false, true)); |
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assertTrue(ai.get()); |
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} |
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|
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/** |
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* compareAndSet in one thread enables another waiting for value |
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* to succeed |
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*/ |
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public void testCompareAndSetInMultipleThreads() throws Exception { |
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final AtomicBoolean ai = new AtomicBoolean(true); |
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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!ai.compareAndSet(false, true)) Thread.yield(); |
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}}); |
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|
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t.start(); |
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assertTrue(ai.compareAndSet(true, false)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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} |
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|
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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSet() { |
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AtomicBoolean ai = new AtomicBoolean(true); |
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do {} while (!ai.weakCompareAndSet(true, false)); |
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assertFalse(ai.get()); |
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do {} while (!ai.weakCompareAndSet(false, false)); |
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assertFalse(ai.get()); |
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do {} while (!ai.weakCompareAndSet(false, true)); |
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assertTrue(ai.get()); |
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} |
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|
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/** |
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* getAndSet returns previous value and sets to given value |
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*/ |
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public void testGetAndSet() { |
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AtomicBoolean ai = new AtomicBoolean(); |
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boolean[] booleans = { false, true }; |
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for (boolean before : booleans) |
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for (boolean after : booleans) { |
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ai.set(before); |
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assertEquals(before, ai.getAndSet(after)); |
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assertEquals(after, ai.get()); |
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} |
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} |
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|
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/** |
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* a deserialized serialized atomic holds same value |
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*/ |
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public void testSerialization() throws Exception { |
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AtomicBoolean x = new AtomicBoolean(); |
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AtomicBoolean y = serialClone(x); |
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x.set(true); |
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AtomicBoolean z = serialClone(x); |
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assertTrue(x.get()); |
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assertFalse(y.get()); |
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assertTrue(z.get()); |
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} |
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|
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/** |
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* toString returns current value. |
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*/ |
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public void testToString() { |
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AtomicBoolean ai = new AtomicBoolean(); |
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assertEquals(Boolean.toString(false), ai.toString()); |
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ai.set(true); |
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assertEquals(Boolean.toString(true), ai.toString()); |
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} |
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|
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} |
