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Diffstat (limited to 'jsr166-tests/src/test/java/jsr166/AtomicIntegerTest.java')
| -rw-r--r-- | jsr166-tests/src/test/java/jsr166/AtomicIntegerTest.java | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/jsr166-tests/src/test/java/jsr166/AtomicIntegerTest.java b/jsr166-tests/src/test/java/jsr166/AtomicIntegerTest.java new file mode 100644 index 0000000..2afaa73 --- /dev/null +++ b/jsr166-tests/src/test/java/jsr166/AtomicIntegerTest.java @@ -0,0 +1,261 @@ +/* + * 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 junit.framework.*; +import java.util.concurrent.atomic.AtomicInteger; + +public class AtomicIntegerTest extends JSR166TestCase { + + 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); + while (!ai.weakCompareAndSet(1, 2)); + while (!ai.weakCompareAndSet(2, -4)); + assertEquals(-4, ai.get()); + 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()); + } + } + +} |