--- jsr166/src/test/tck/AtomicReferenceArrayTest.java 2003/09/07 20:39:11 1.2 +++ jsr166/src/test/tck/AtomicReferenceArrayTest.java 2011/05/31 16:16:23 1.21 @@ -1,112 +1,200 @@ /* - * 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.Arrays; +import java.util.concurrent.atomic.AtomicReferenceArray; -public class AtomicReferenceArrayTest extends TestCase -{ - static final int N = 10; - - static final Integer zero = new Integer(0); - static final Integer one = new Integer(1); - static final Integer two = new Integer(2); - static final Integer m3 = new Integer(-3); - static final Integer m4 = new Integer(-4); - static final Integer m5 = new Integer(-5); - static final Integer seven = new Integer(7); - static final Integer m10 = new Integer(-10); - - public static void main (String[] args) { - junit.textui.TestRunner.run (suite()); +public class AtomicReferenceArrayTest extends JSR166TestCase { + public static void main(String[] args) { + junit.textui.TestRunner.run(suite()); } public static Test suite() { return new TestSuite(AtomicReferenceArrayTest.class); } - public void testConstructor(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++i) { + /** + * constructor creates array of given size with all elements null + */ + public void testConstructor() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { assertNull(ai.get(i)); } } - public void testGetSet(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++i) { + /** + * constructor with null array throws NPE + */ + public void testConstructor2NPE() { + try { + Integer[] a = null; + AtomicReferenceArray ai = new AtomicReferenceArray(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 ai = new AtomicReferenceArray(a); + assertEquals(a.length, ai.length()); + for (int i = 0; i < a.length; ++i) + assertEquals(a[i], ai.get(i)); + } + + /** + * get and set for out of bound indices throw IndexOutOfBoundsException + */ + public void testIndexing() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + try { + ai.get(SIZE); + shouldThrow(); + } catch (IndexOutOfBoundsException success) { + } + try { + ai.get(-1); + shouldThrow(); + } catch (IndexOutOfBoundsException success) { + } + try { + ai.set(SIZE, null); + shouldThrow(); + } catch (IndexOutOfBoundsException success) { + } + try { + ai.set(-1, null); + shouldThrow(); + } catch (IndexOutOfBoundsException success) { + } + } + + /** + * get returns the last value set at index + */ + public void testGetSet() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { ai.set(i, one); - assertEquals(one,ai.get(i)); + assertSame(one,ai.get(i)); ai.set(i, two); - assertEquals(two,ai.get(i)); + assertSame(two,ai.get(i)); ai.set(i, m3); - assertEquals(m3,ai.get(i)); + assertSame(m3,ai.get(i)); + } + } + + /** + * get returns the last value lazySet at index by same thread + */ + public void testGetLazySet() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { + ai.lazySet(i, one); + assertSame(one,ai.get(i)); + ai.lazySet(i, two); + assertSame(two,ai.get(i)); + ai.lazySet(i, m3); + assertSame(m3,ai.get(i)); } } - public void testCompareAndSet(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++i) { + /** + * compareAndSet succeeds in changing value if equal to expected else fails + */ + public void testCompareAndSet() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { ai.set(i, one); assertTrue(ai.compareAndSet(i, one,two)); assertTrue(ai.compareAndSet(i, two,m4)); - assertEquals(m4,ai.get(i)); + assertSame(m4,ai.get(i)); assertFalse(ai.compareAndSet(i, m5,seven)); - assertFalse((seven.equals(ai.get(i)))); + assertSame(m4,ai.get(i)); assertTrue(ai.compareAndSet(i, m4,seven)); - assertEquals(seven,ai.get(i)); + assertSame(seven,ai.get(i)); } } - public void testWeakCompareAndSet(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++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(a.get(0), three); + } + + /** + * repeated weakCompareAndSet succeeds in changing value when equal + * to expected + */ + public void testWeakCompareAndSet() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { ai.set(i, one); - while(!ai.weakCompareAndSet(i, one,two)); - while(!ai.weakCompareAndSet(i, two,m4)); - assertEquals(m4,ai.get(i)); - while(!ai.weakCompareAndSet(i, m4,seven)); - assertEquals(seven,ai.get(i)); + while (!ai.weakCompareAndSet(i, one,two)); + while (!ai.weakCompareAndSet(i, two,m4)); + assertSame(m4,ai.get(i)); + while (!ai.weakCompareAndSet(i, m4,seven)); + assertSame(seven,ai.get(i)); } } - public void testGetAndSet(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++i) { + /** + * getAndSet returns previous value and sets to given value at given index + */ + public void testGetAndSet() { + AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++i) { ai.set(i, one); - assertEquals(one,ai.getAndSet(i,zero)); - assertEquals(0,ai.getAndSet(i,m10)); - assertEquals(m10,ai.getAndSet(i,one)); + assertSame(one,ai.getAndSet(i,zero)); + assertSame(zero,ai.getAndSet(i,m10)); + assertSame(m10,ai.getAndSet(i,one)); } } - public void testSerialization() { - AtomicReferenceArray l = new AtomicReferenceArray(10); - for (int i = 0; i < 10; ++i) { - l.set(i, new Integer(-i)); - } - - try { - 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)); - AtomicReferenceArray r = (AtomicReferenceArray) in.readObject(); - assertEquals(l.length(), r.length()); - for (int i = 0; i < 10; ++i) { - assertEquals(r.get(i), l.get(i)); - } - } catch(Exception e){ - e.printStackTrace(); - fail("unexpected exception"); + /** + * 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); + assertTrue(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 ai = new AtomicReferenceArray(a); + assertEquals(Arrays.toString(a), ai.toString()); + } }