| /* |
| * 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/licenses/publicdomain |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| package tests.api.java.util.concurrent; // android-added |
| |
| import junit.framework.*; |
| import java.util.concurrent.atomic.*; |
| import java.io.*; |
| |
| public class AtomicLongTest extends JSR166TestCase { |
| public static Test suite() { |
| return new TestSuite(AtomicLongTest.class); |
| } |
| |
| 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()); |
| } |
| |
| /** |
| * 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(ai.get(), 3); |
| } |
| |
| /** |
| * 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 l = new AtomicLong(); |
| |
| 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()); |
| } |
| |
| /** |
| * toString returns current value. |
| */ |
| public void testToString() { |
| AtomicLong ai = new AtomicLong(); |
| assertEquals("0", ai.toString()); |
| for (long i : VALUES) { |
| ai.set(i); |
| assertEquals(ai.toString(), Long.toString(i)); |
| } |
| } |
| |
| /** |
| * 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()); |
| } |
| } |
| |
| /** |
| * longValue returns current value. |
| */ |
| public void testLongValue() { |
| AtomicLong ai = new AtomicLong(); |
| assertEquals(0L, ai.longValue()); |
| for (long x : VALUES) { |
| ai.set(x); |
| assertEquals((long)x, ai.longValue()); |
| } |
| } |
| |
| /** |
| * 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()); |
| } |
| } |
| |
| /** |
| * 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()); |
| } |
| } |
| |
| } |