--- jsr166/src/test/tck/AtomicLongArrayTest.java 2003/09/14 20:42:40 1.3 +++ jsr166/src/test/tck/AtomicLongArrayTest.java 2005/05/25 14:27:37 1.9 @@ -1,13 +1,15 @@ /* - * 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 AtomicLongArrayTest extends JSR166TestCase { public static void main (String[] args) { @@ -17,12 +19,65 @@ public class AtomicLongArrayTest extends return new TestSuite(AtomicLongArrayTest.class); } + /** + * constructor creates array of given size with all elements zero + */ public void testConstructor(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) assertEquals(0,ai.get(i)); } + /** + * constructor with null array throws NPE + */ + public void testConstructor2NPE() { + try { + long[] a = null; + AtomicLongArray ai = new AtomicLongArray(a); + } catch (NullPointerException success) { + } catch (Exception ex) { + unexpectedException(); + } + } + + /** + * constructor with array is of same size and has all elements + */ + public void testConstructor2() { + long[] a = { 17L, 3L, -42L, 99L, -7L}; + AtomicLongArray ai = new AtomicLongArray(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(){ + AtomicLongArray ai = new AtomicLongArray(SIZE); + try { + ai.get(SIZE); + } catch(IndexOutOfBoundsException success){ + } + try { + ai.get(-1); + } catch(IndexOutOfBoundsException success){ + } + try { + ai.set(SIZE, 0); + } catch(IndexOutOfBoundsException success){ + } + try { + ai.set(-1, 0); + } catch(IndexOutOfBoundsException success){ + } + } + + /** + * get returns the last value set at index + */ public void testGetSet(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -35,6 +90,24 @@ public class AtomicLongArrayTest extends } } + /** + * get returns the last value lazySet at index by same thread + */ + public void testGetLazySet(){ + AtomicLongArray ai = new AtomicLongArray(SIZE); + for (int i = 0; i < SIZE; ++i) { + ai.lazySet(i, 1); + assertEquals(1,ai.get(i)); + ai.lazySet(i, 2); + assertEquals(2,ai.get(i)); + ai.lazySet(i, -3); + assertEquals(-3,ai.get(i)); + } + } + + /** + * compareAndSet succeeds in changing value if equal to expected else fails + */ public void testCompareAndSet(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -49,6 +122,33 @@ public class AtomicLongArrayTest extends } } + /** + * compareAndSet in one thread enables another waiting for value + * to succeed + */ + public void testCompareAndSetInMultipleThreads() { + final AtomicLongArray a = new AtomicLongArray(1); + a.set(0, 1); + Thread t = new Thread(new Runnable() { + public void run() { + while(!a.compareAndSet(0, 2, 3)) Thread.yield(); + }}); + try { + t.start(); + assertTrue(a.compareAndSet(0, 1, 2)); + t.join(LONG_DELAY_MS); + assertFalse(t.isAlive()); + assertEquals(a.get(0), 3); + } + catch(Exception e) { + unexpectedException(); + } + } + + /** + * repeated weakCompareAndSet succeeds in changing value when equal + * to expected + */ public void testWeakCompareAndSet(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -61,6 +161,9 @@ public class AtomicLongArrayTest extends } } + /** + * getAndSet returns previous value and sets to given value at given index + */ public void testGetAndSet(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -71,6 +174,9 @@ public class AtomicLongArrayTest extends } } + /** + * getAndAdd returns previous value and adds given value + */ public void testGetAndAdd(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -82,6 +188,9 @@ public class AtomicLongArrayTest extends } } + /** + * getAndDecrement returns previous value and decrements + */ public void testGetAndDecrement(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -92,6 +201,9 @@ public class AtomicLongArrayTest extends } } + /** + * getAndIncrement returns previous value and increments + */ public void testGetAndIncrement(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -106,6 +218,9 @@ public class AtomicLongArrayTest extends } } + /** + * addAndGet adds given value to current, and returns current value + */ public void testAddAndGet() { AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -117,6 +232,9 @@ public class AtomicLongArrayTest extends } } + /** + * decrementAndGet decrements and returns current value + */ public void testDecrementAndGet(){ AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -128,6 +246,9 @@ public class AtomicLongArrayTest extends } } + /** + * incrementAndGet increments and returns current value + */ public void testIncrementAndGet() { AtomicLongArray ai = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) { @@ -166,6 +287,10 @@ public class AtomicLongArrayTest extends } } + /** + * Multiple threads using same array of counters successfully + * update a number of times equal to total count + */ public void testCountingInMultipleThreads() { try { final AtomicLongArray ai = new AtomicLongArray(SIZE); @@ -182,10 +307,13 @@ public class AtomicLongArrayTest extends assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); } catch(InterruptedException ie) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * a deserialized serialized array holds same values + */ public void testSerialization() { AtomicLongArray l = new AtomicLongArray(SIZE); for (int i = 0; i < SIZE; ++i) @@ -204,10 +332,18 @@ public class AtomicLongArrayTest extends assertEquals(l.get(i), r.get(i)); } } catch(Exception e){ - e.printStackTrace(); - fail("unexpected exception"); + unexpectedException(); } } + /** + * toString returns current value. + */ + public void testToString() { + long[] a = { 17, 3, -42, 99, -7}; + AtomicLongArray ai = new AtomicLongArray(a); + assertEquals(Arrays.toString(a), ai.toString()); + } + }