| /* |
| * 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.AtomicInteger; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class AtomicIntegerTest 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(AtomicIntegerTest.class); |
| // } |
| |
| final int[] VALUES = { |
| Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, |
| }; |
| |
| /** |
| * constructor initializes to given value |
| */ |
| public void testConstructor() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.get()); |
| } |
| |
| /** |
| * default constructed initializes to zero |
| */ |
| public void testConstructor2() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals(0, ai.get()); |
| } |
| |
| /** |
| * get returns the last value set |
| */ |
| public void testGetSet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.get()); |
| ai.set(2); |
| assertEquals(2, ai.get()); |
| ai.set(-3); |
| assertEquals(-3, ai.get()); |
| } |
| |
| /** |
| * get returns the last value lazySet in same thread |
| */ |
| public void testGetLazySet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.get()); |
| ai.lazySet(2); |
| assertEquals(2, ai.get()); |
| ai.lazySet(-3); |
| assertEquals(-3, ai.get()); |
| } |
| |
| /** |
| * compareAndSet succeeds in changing value if equal to expected else fails |
| */ |
| public void testCompareAndSet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertTrue(ai.compareAndSet(1, 2)); |
| assertTrue(ai.compareAndSet(2, -4)); |
| assertEquals(-4, ai.get()); |
| assertFalse(ai.compareAndSet(-5, 7)); |
| assertEquals(-4, ai.get()); |
| assertTrue(ai.compareAndSet(-4, 7)); |
| assertEquals(7, ai.get()); |
| } |
| |
| /** |
| * compareAndSet in one thread enables another waiting for value |
| * to succeed |
| */ |
| public void testCompareAndSetInMultipleThreads() throws Exception { |
| final AtomicInteger ai = new AtomicInteger(1); |
| Thread t = new Thread(new CheckedRunnable() { |
| public void realRun() { |
| while (!ai.compareAndSet(2, 3)) |
| Thread.yield(); |
| }}); |
| |
| t.start(); |
| assertTrue(ai.compareAndSet(1, 2)); |
| t.join(LONG_DELAY_MS); |
| assertFalse(t.isAlive()); |
| assertEquals(3, ai.get()); |
| } |
| |
| /** |
| * repeated weakCompareAndSet succeeds in changing value when equal |
| * to expected |
| */ |
| public void testWeakCompareAndSet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| do {} while (!ai.weakCompareAndSet(1, 2)); |
| do {} while (!ai.weakCompareAndSet(2, -4)); |
| assertEquals(-4, ai.get()); |
| do {} while (!ai.weakCompareAndSet(-4, 7)); |
| assertEquals(7, ai.get()); |
| } |
| |
| /** |
| * getAndSet returns previous value and sets to given value |
| */ |
| public void testGetAndSet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.getAndSet(0)); |
| assertEquals(0, ai.getAndSet(-10)); |
| assertEquals(-10, ai.getAndSet(1)); |
| } |
| |
| /** |
| * getAndAdd returns previous value and adds given value |
| */ |
| public void testGetAndAdd() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.getAndAdd(2)); |
| assertEquals(3, ai.get()); |
| assertEquals(3, ai.getAndAdd(-4)); |
| assertEquals(-1, ai.get()); |
| } |
| |
| /** |
| * getAndDecrement returns previous value and decrements |
| */ |
| public void testGetAndDecrement() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.getAndDecrement()); |
| assertEquals(0, ai.getAndDecrement()); |
| assertEquals(-1, ai.getAndDecrement()); |
| } |
| |
| /** |
| * getAndIncrement returns previous value and increments |
| */ |
| public void testGetAndIncrement() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(1, ai.getAndIncrement()); |
| assertEquals(2, ai.get()); |
| ai.set(-2); |
| assertEquals(-2, ai.getAndIncrement()); |
| assertEquals(-1, ai.getAndIncrement()); |
| assertEquals(0, ai.getAndIncrement()); |
| assertEquals(1, ai.get()); |
| } |
| |
| /** |
| * addAndGet adds given value to current, and returns current value |
| */ |
| public void testAddAndGet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(3, ai.addAndGet(2)); |
| assertEquals(3, ai.get()); |
| assertEquals(-1, ai.addAndGet(-4)); |
| assertEquals(-1, ai.get()); |
| } |
| |
| /** |
| * decrementAndGet decrements and returns current value |
| */ |
| public void testDecrementAndGet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(0, ai.decrementAndGet()); |
| assertEquals(-1, ai.decrementAndGet()); |
| assertEquals(-2, ai.decrementAndGet()); |
| assertEquals(-2, ai.get()); |
| } |
| |
| /** |
| * incrementAndGet increments and returns current value |
| */ |
| public void testIncrementAndGet() { |
| AtomicInteger ai = new AtomicInteger(1); |
| assertEquals(2, ai.incrementAndGet()); |
| assertEquals(2, ai.get()); |
| ai.set(-2); |
| assertEquals(-1, ai.incrementAndGet()); |
| assertEquals(0, ai.incrementAndGet()); |
| assertEquals(1, ai.incrementAndGet()); |
| assertEquals(1, ai.get()); |
| } |
| |
| /** |
| * a deserialized serialized atomic holds same value |
| */ |
| public void testSerialization() throws Exception { |
| AtomicInteger x = new AtomicInteger(); |
| AtomicInteger y = serialClone(x); |
| assertNotSame(x, y); |
| x.set(22); |
| AtomicInteger z = serialClone(x); |
| assertEquals(22, x.get()); |
| assertEquals(0, y.get()); |
| assertEquals(22, z.get()); |
| } |
| |
| /** |
| * toString returns current value. |
| */ |
| public void testToString() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals("0", ai.toString()); |
| for (int x : VALUES) { |
| ai.set(x); |
| assertEquals(Integer.toString(x), ai.toString()); |
| } |
| } |
| |
| /** |
| * intValue returns current value. |
| */ |
| public void testIntValue() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals(0, ai.intValue()); |
| for (int x : VALUES) { |
| ai.set(x); |
| assertEquals(x, ai.intValue()); |
| } |
| } |
| |
| /** |
| * longValue returns current value. |
| */ |
| public void testLongValue() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals(0L, ai.longValue()); |
| for (int x : VALUES) { |
| ai.set(x); |
| assertEquals((long)x, ai.longValue()); |
| } |
| } |
| |
| /** |
| * floatValue returns current value. |
| */ |
| public void testFloatValue() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals(0.0f, ai.floatValue()); |
| for (int x : VALUES) { |
| ai.set(x); |
| assertEquals((float)x, ai.floatValue()); |
| } |
| } |
| |
| /** |
| * doubleValue returns current value. |
| */ |
| public void testDoubleValue() { |
| AtomicInteger ai = new AtomicInteger(); |
| assertEquals(0.0d, ai.doubleValue()); |
| for (int x : VALUES) { |
| ai.set(x); |
| assertEquals((double)x, ai.doubleValue()); |
| } |
| } |
| |
| } |