| /* |
| * 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. |
| */ |
| |
| package jsr166; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class AtomicBooleanTest extends JSR166TestCase { |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // 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(true); |
| assertEquals(true, ai.getAndSet(false)); |
| assertEquals(false, ai.getAndSet(false)); |
| assertEquals(false, ai.getAndSet(true)); |
| assertTrue(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()); |
| } |
| |
| } |