--- jsr166/src/test/tck/AtomicLongTest.java 2003/09/14 20:42:40 1.3 +++ jsr166/src/test/tck/AtomicLongTest.java 2014/12/31 19:05:42 1.27 @@ -1,138 +1,269 @@ /* - * Written by members of JCP JSR-166 Expert Group and released to the - * public domain. Use, modify, and redistribute this code in any way - * without acknowledgement. Other contributors include Andrew Wright, - * Jeffrey Hayes, Pat Fischer, Mike Judd. + * 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 junit.framework.*; -import java.util.concurrent.atomic.*; -import java.io.*; +import java.util.concurrent.atomic.AtomicLong; + +import junit.framework.Test; +import junit.framework.TestSuite; public class AtomicLongTest extends JSR166TestCase { - public static void main (String[] args) { - junit.textui.TestRunner.run (suite()); + public static void main(String[] args) { + junit.textui.TestRunner.run(suite()); } public static Test suite() { return new TestSuite(AtomicLongTest.class); } - public void testConstructor(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(1,ai.get()); - } - - public void testConstructor2(){ + final long[] VALUES = { + Long.MIN_VALUE, + Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, + Long.MAX_VALUE, + }; + + /** + * constructor initializes to given value + */ + public void testConstructor() { + AtomicLong ai = new AtomicLong(1); + assertEquals(1, ai.get()); + } + + /** + * default constructed initializes to zero + */ + public void testConstructor2() { AtomicLong ai = new AtomicLong(); - assertEquals(0,ai.get()); - } - - public void testGetSet(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(1,ai.get()); - ai.set(2); - assertEquals(2,ai.get()); - ai.set(-3); - assertEquals(-3,ai.get()); - - } - public void testCompareAndSet(){ - AtomicLong ai = new AtomicLong(1); - assertTrue(ai.compareAndSet(1,2)); - assertTrue(ai.compareAndSet(2,-4)); - assertEquals(-4,ai.get()); - assertFalse(ai.compareAndSet(-5,7)); - assertFalse((7 == ai.get())); - assertTrue(ai.compareAndSet(-4,7)); - assertEquals(7,ai.get()); - } - - public void testWeakCompareAndSet(){ - AtomicLong ai = new AtomicLong(1); - while(!ai.weakCompareAndSet(1,2)); - while(!ai.weakCompareAndSet(2,-4)); - assertEquals(-4,ai.get()); - while(!ai.weakCompareAndSet(-4,7)); - assertEquals(7,ai.get()); - } - - public void testGetAndSet(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(1,ai.getAndSet(0)); - assertEquals(0,ai.getAndSet(-10)); - assertEquals(-10,ai.getAndSet(1)); - } - - public void testGetAndAdd(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(1,ai.getAndAdd(2)); - assertEquals(3,ai.get()); - assertEquals(3,ai.getAndAdd(-4)); - assertEquals(-1,ai.get()); + assertEquals(0, ai.get()); } - public void testGetAndDecrement(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(1,ai.getAndDecrement()); - assertEquals(0,ai.getAndDecrement()); - assertEquals(-1,ai.getAndDecrement()); - } - - public void testGetAndIncrement(){ - AtomicLong ai = new AtomicLong(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()); + /** + * get returns the last value set + */ + public void testGetSet() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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 AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(1); + assertEquals(1, ai.getAndDecrement()); + assertEquals(0, ai.getAndDecrement()); + assertEquals(-1, ai.getAndDecrement()); + } + + /** + * getAndIncrement returns previous value and increments + */ + public void testGetAndIncrement() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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() { + AtomicLong ai = new AtomicLong(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 { + AtomicLong x = new AtomicLong(); + AtomicLong y = serialClone(x); + assertNotSame(x, y); + x.set(-22); + AtomicLong z = serialClone(x); + assertNotSame(y, z); + assertEquals(-22, x.get()); + assertEquals(0, y.get()); + assertEquals(-22, z.get()); + } + + /** + * toString returns current value. + */ + public void testToString() { + AtomicLong ai = new AtomicLong(); + assertEquals("0", ai.toString()); + for (long x : VALUES) { + ai.set(x); + assertEquals(Long.toString(x), ai.toString()); + } } - public void testAddAndGet(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(3,ai.addAndGet(2)); - assertEquals(3,ai.get()); - assertEquals(-1,ai.addAndGet(-4)); - assertEquals(-1,ai.get()); + /** + * intValue returns current value. + */ + public void testIntValue() { + AtomicLong ai = new AtomicLong(); + assertEquals(0, ai.intValue()); + for (long x : VALUES) { + ai.set(x); + assertEquals((int)x, ai.intValue()); + } } - public void testDecrementAndGet(){ - AtomicLong ai = new AtomicLong(1); - assertEquals(0,ai.decrementAndGet()); - assertEquals(-1,ai.decrementAndGet()); - assertEquals(-2,ai.decrementAndGet()); - assertEquals(-2,ai.get()); + /** + * longValue returns current value. + */ + public void testLongValue() { + AtomicLong ai = new AtomicLong(); + assertEquals(0L, ai.longValue()); + for (long x : VALUES) { + ai.set(x); + assertEquals(x, ai.longValue()); + } } - public void testIncrementAndGet(){ - AtomicLong ai = new AtomicLong(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()); + /** + * floatValue returns current value. + */ + public void testFloatValue() { + AtomicLong ai = new AtomicLong(); + assertEquals(0.0f, ai.floatValue()); + for (long x : VALUES) { + ai.set(x); + assertEquals((float)x, ai.floatValue()); + } } - public void testSerialization() { - AtomicLong l = new AtomicLong(); - - try { - l.set(-22); - ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); - ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); - out.writeObject(l); - out.close(); - - ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); - ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); - AtomicLong r = (AtomicLong) in.readObject(); - assertEquals(l.get(), r.get()); - } catch(Exception e){ - e.printStackTrace(); - fail("unexpected exception"); + /** + * doubleValue returns current value. + */ + public void testDoubleValue() { + AtomicLong ai = new AtomicLong(); + assertEquals(0.0d, ai.doubleValue()); + for (long x : VALUES) { + ai.set(x); + assertEquals((double)x, ai.doubleValue()); } }