--- jsr166/src/test/tck/AtomicReferenceArrayTest.java 2003/08/31 19:24:53 1.1 +++ jsr166/src/test/tck/AtomicReferenceArrayTest.java 2009/11/17 02:50:57 1.14 @@ -1,26 +1,17 @@ /* - * 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/licenses/publicdomain + * 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.*; -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 class AtomicReferenceArrayTest extends JSR166TestCase { public static void main (String[] args) { junit.textui.TestRunner.run (suite()); } @@ -28,16 +19,72 @@ public class AtomicReferenceArrayTest ex 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)); ai.set(i, two); @@ -47,9 +94,27 @@ public class AtomicReferenceArrayTest ex } } - public void testCompareAndSet(){ - AtomicReferenceArray ai = new AtomicReferenceArray(N); - for (int i = 0; i < N; ++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); + assertEquals(one,ai.get(i)); + ai.lazySet(i, two); + assertEquals(two,ai.get(i)); + ai.lazySet(i, m3); + assertEquals(m3,ai.get(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)); @@ -61,21 +126,51 @@ public class AtomicReferenceArrayTest ex } } - 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() { + final AtomicReferenceArray a = new AtomicReferenceArray(1); + a.set(0, one); + Thread t = new Thread(new Runnable() { + public void run() { + while (!a.compareAndSet(0, two, three)) Thread.yield(); + }}); + try { + t.start(); + assertTrue(a.compareAndSet(0, one, two)); + t.join(LONG_DELAY_MS); + assertFalse(t.isAlive()); + assertEquals(a.get(0), three); + } + catch (Exception e) { + unexpectedException(); + } + } + + /** + * 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)); + while (!ai.weakCompareAndSet(i, one,two)); + while (!ai.weakCompareAndSet(i, two,m4)); assertEquals(m4,ai.get(i)); - while(!ai.weakCompareAndSet(i, m4,seven)); + while (!ai.weakCompareAndSet(i, m4,seven)); assertEquals(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)); @@ -83,5 +178,40 @@ public class AtomicReferenceArrayTest ex } } + /** + * a deserialized serialized array holds same values + */ + public void testSerialization() { + AtomicReferenceArray l = new AtomicReferenceArray(SIZE); + for (int i = 0; i < SIZE; ++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 < SIZE; ++i) { + assertEquals(r.get(i), l.get(i)); + } + } catch (Exception e) { + unexpectedException(); + } + } + + /** + * 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()); + } }