| /* |
| * 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.Arrays; |
| import java.util.concurrent.atomic.AtomicReferenceArray; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class AtomicReferenceArrayTest 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(AtomicReferenceArrayTest.class); |
| // } |
| |
| /** |
| * constructor creates array of given size with all elements null |
| */ |
| public void testConstructor() { |
| AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| assertNull(aa.get(i)); |
| } |
| } |
| |
| /** |
| * constructor with null array throws NPE |
| */ |
| public void testConstructor2NPE() { |
| try { |
| Integer[] a = null; |
| new AtomicReferenceArray<Integer>(a); |
| shouldThrow(); |
| } catch (NullPointerException success) {} |
| } |
| |
| /** |
| * constructor with array is of same size and has all elements |
| */ |
| public void testConstructor2() { |
| Integer[] a = { two, one, three, four, seven }; |
| AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a); |
| assertEquals(a.length, aa.length()); |
| for (int i = 0; i < a.length; i++) |
| assertEquals(a[i], aa.get(i)); |
| } |
| |
| /** |
| * Initialize AtomicReferenceArray<Class> with SubClass[] |
| */ |
| public void testConstructorSubClassArray() { |
| Integer[] a = { two, one, three, four, seven }; |
| AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a); |
| assertEquals(a.length, aa.length()); |
| for (int i = 0; i < a.length; i++) { |
| assertSame(a[i], aa.get(i)); |
| Long x = Long.valueOf(i); |
| aa.set(i, x); |
| assertSame(x, aa.get(i)); |
| } |
| } |
| |
| /** |
| * get and set for out of bound indices throw IndexOutOfBoundsException |
| */ |
| public void testIndexing() { |
| AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE); |
| for (int index : new int[] { -1, SIZE }) { |
| try { |
| aa.get(index); |
| shouldThrow(); |
| } catch (IndexOutOfBoundsException success) {} |
| try { |
| aa.set(index, null); |
| shouldThrow(); |
| } catch (IndexOutOfBoundsException success) {} |
| try { |
| aa.lazySet(index, null); |
| shouldThrow(); |
| } catch (IndexOutOfBoundsException success) {} |
| try { |
| aa.compareAndSet(index, null, null); |
| shouldThrow(); |
| } catch (IndexOutOfBoundsException success) {} |
| try { |
| aa.weakCompareAndSet(index, null, null); |
| shouldThrow(); |
| } catch (IndexOutOfBoundsException success) {} |
| } |
| } |
| |
| /** |
| * get returns the last value set at index |
| */ |
| public void testGetSet() { |
| AtomicReferenceArray aa = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| aa.set(i, one); |
| assertSame(one, aa.get(i)); |
| aa.set(i, two); |
| assertSame(two, aa.get(i)); |
| aa.set(i, m3); |
| assertSame(m3, aa.get(i)); |
| } |
| } |
| |
| /** |
| * get returns the last value lazySet at index by same thread |
| */ |
| public void testGetLazySet() { |
| AtomicReferenceArray aa = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| aa.lazySet(i, one); |
| assertSame(one, aa.get(i)); |
| aa.lazySet(i, two); |
| assertSame(two, aa.get(i)); |
| aa.lazySet(i, m3); |
| assertSame(m3, aa.get(i)); |
| } |
| } |
| |
| /** |
| * compareAndSet succeeds in changing value if equal to expected else fails |
| */ |
| public void testCompareAndSet() { |
| AtomicReferenceArray aa = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| aa.set(i, one); |
| assertTrue(aa.compareAndSet(i, one, two)); |
| assertTrue(aa.compareAndSet(i, two, m4)); |
| assertSame(m4, aa.get(i)); |
| assertFalse(aa.compareAndSet(i, m5, seven)); |
| assertSame(m4, aa.get(i)); |
| assertTrue(aa.compareAndSet(i, m4, seven)); |
| assertSame(seven, aa.get(i)); |
| } |
| } |
| |
| /** |
| * compareAndSet in one thread enables another waiting for value |
| * to succeed |
| */ |
| public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
| final AtomicReferenceArray a = new AtomicReferenceArray(1); |
| a.set(0, one); |
| Thread t = new Thread(new CheckedRunnable() { |
| public void realRun() { |
| while (!a.compareAndSet(0, two, three)) |
| Thread.yield(); |
| }}); |
| |
| t.start(); |
| assertTrue(a.compareAndSet(0, one, two)); |
| t.join(LONG_DELAY_MS); |
| assertFalse(t.isAlive()); |
| assertSame(three, a.get(0)); |
| } |
| |
| /** |
| * repeated weakCompareAndSet succeeds in changing value when equal |
| * to expected |
| */ |
| public void testWeakCompareAndSet() { |
| AtomicReferenceArray aa = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| aa.set(i, one); |
| do {} while (!aa.weakCompareAndSet(i, one, two)); |
| do {} while (!aa.weakCompareAndSet(i, two, m4)); |
| assertSame(m4, aa.get(i)); |
| do {} while (!aa.weakCompareAndSet(i, m4, seven)); |
| assertSame(seven, aa.get(i)); |
| } |
| } |
| |
| /** |
| * getAndSet returns previous value and sets to given value at given index |
| */ |
| public void testGetAndSet() { |
| AtomicReferenceArray aa = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| aa.set(i, one); |
| assertSame(one, aa.getAndSet(i, zero)); |
| assertSame(zero, aa.getAndSet(i, m10)); |
| assertSame(m10, aa.getAndSet(i, one)); |
| } |
| } |
| |
| /** |
| * a deserialized serialized array holds same values |
| */ |
| public void testSerialization() throws Exception { |
| AtomicReferenceArray x = new AtomicReferenceArray(SIZE); |
| for (int i = 0; i < SIZE; i++) { |
| x.set(i, new Integer(-i)); |
| } |
| AtomicReferenceArray y = serialClone(x); |
| assertNotSame(x, y); |
| assertEquals(x.length(), y.length()); |
| for (int i = 0; i < SIZE; i++) { |
| assertEquals(x.get(i), y.get(i)); |
| } |
| } |
| |
| /** |
| * toString returns current value. |
| */ |
| public void testToString() { |
| Integer[] a = { two, one, three, four, seven }; |
| AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a); |
| assertEquals(Arrays.toString(a), aa.toString()); |
| } |
| } |