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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.concurrent.atomic.*; |
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import java.util.Arrays; |
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import java.util.concurrent.atomic.AtomicIntegerArray; |
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|
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public class AtomicIntegerArrayTest extends TestCase |
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{ |
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static final int N = 10; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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public class AtomicIntegerArrayTest extends JSR166TestCase { |
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|
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public static void main(String[] args) { |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(AtomicIntegerArrayTest.class); |
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} |
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|
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public void testConstructor(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) |
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assertEquals(0,ai.get(i)); |
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} |
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|
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public void testGetSet(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.get(i)); |
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ai.set(i, 2); |
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assertEquals(2,ai.get(i)); |
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ai.set(i, -3); |
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assertEquals(-3,ai.get(i)); |
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} |
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} |
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|
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public void testCompareAndSet(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertTrue(ai.compareAndSet(i, 1,2)); |
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assertTrue(ai.compareAndSet(i, 2,-4)); |
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assertEquals(-4,ai.get(i)); |
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assertFalse(ai.compareAndSet(i, -5,7)); |
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assertFalse((7 == ai.get(i))); |
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assertTrue(ai.compareAndSet(i, -4,7)); |
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assertEquals(7,ai.get(i)); |
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} |
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} |
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|
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public void testWeakCompareAndSet(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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while(!ai.weakCompareAndSet(i, 1,2)); |
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while(!ai.weakCompareAndSet(i, 2,-4)); |
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assertEquals(-4,ai.get(i)); |
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while(!ai.weakCompareAndSet(i, -4,7)); |
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assertEquals(7,ai.get(i)); |
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} |
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} |
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|
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public void testGetAndSet(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.getAndSet(i,0)); |
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assertEquals(0,ai.getAndSet(i,-10)); |
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assertEquals(-10,ai.getAndSet(i,1)); |
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} |
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} |
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|
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public void testGetAndAdd(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.getAndAdd(i,2)); |
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assertEquals(3,ai.get(i)); |
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assertEquals(3,ai.getAndAdd(i,-4)); |
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assertEquals(-1,ai.get(i)); |
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} |
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} |
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|
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public void testGetAndDecrement(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.getAndDecrement(i)); |
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assertEquals(0,ai.getAndDecrement(i)); |
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assertEquals(-1,ai.getAndDecrement(i)); |
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} |
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} |
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|
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public void testGetAndIncrement(){ |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
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for (int i = 0; i < N; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.getAndIncrement(i)); |
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assertEquals(2,ai.get(i)); |
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ai.set(i,-2); |
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assertEquals(-2,ai.getAndIncrement(i)); |
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assertEquals(-1,ai.getAndIncrement(i)); |
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assertEquals(0,ai.getAndIncrement(i)); |
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assertEquals(1,ai.get(i)); |
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/** |
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* constructor creates array of given size with all elements zero |
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*/ |
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public void testConstructor() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; i++) |
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assertEquals(0, aa.get(i)); |
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} |
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|
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/** |
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* constructor with null array throws NPE |
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*/ |
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public void testConstructor2NPE() { |
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try { |
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int[] a = null; |
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new AtomicIntegerArray(a); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* constructor with array is of same size and has all elements |
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*/ |
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public void testConstructor2() { |
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int[] a = { 17, 3, -42, 99, -7 }; |
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AtomicIntegerArray aa = new AtomicIntegerArray(a); |
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assertEquals(a.length, aa.length()); |
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for (int i = 0; i < a.length; i++) |
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assertEquals(a[i], aa.get(i)); |
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} |
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|
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/** |
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* get and set for out of bound indices throw IndexOutOfBoundsException |
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*/ |
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public void testIndexing() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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for (int index : new int[] { -1, SIZE }) { |
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try { |
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aa.get(index); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.set(index, 1); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.lazySet(index, 1); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.compareAndSet(index, 1, 2); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.weakCompareAndSet(index, 1, 2); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.getAndAdd(index, 1); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
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aa.addAndGet(index, 1); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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} |
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} |
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|
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/** |
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* get returns the last value set at index |
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*/ |
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public void testGetSet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(1, aa.get(i)); |
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aa.set(i, 2); |
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assertEquals(2, aa.get(i)); |
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aa.set(i, -3); |
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assertEquals(-3, aa.get(i)); |
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} |
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} |
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|
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/** |
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* get returns the last value lazySet at index by same thread |
109 |
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*/ |
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public void testGetLazySet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; i++) { |
113 |
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aa.lazySet(i, 1); |
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assertEquals(1, aa.get(i)); |
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aa.lazySet(i, 2); |
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assertEquals(2, aa.get(i)); |
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aa.lazySet(i, -3); |
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assertEquals(-3, aa.get(i)); |
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} |
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} |
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|
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/** |
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* compareAndSet succeeds in changing value if equal to expected else fails |
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*/ |
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public void testCompareAndSet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertTrue(aa.compareAndSet(i, 1, 2)); |
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assertTrue(aa.compareAndSet(i, 2, -4)); |
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assertEquals(-4, aa.get(i)); |
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assertFalse(aa.compareAndSet(i, -5, 7)); |
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assertEquals(-4, aa.get(i)); |
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assertTrue(aa.compareAndSet(i, -4, 7)); |
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assertEquals(7, aa.get(i)); |
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} |
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} |
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|
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/** |
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* compareAndSet in one thread enables another waiting for value |
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* to succeed |
142 |
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*/ |
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public void testCompareAndSetInMultipleThreads() throws Exception { |
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final AtomicIntegerArray a = new AtomicIntegerArray(1); |
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a.set(0, 1); |
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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!a.compareAndSet(0, 2, 3)) |
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Thread.yield(); |
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}}); |
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|
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t.start(); |
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assertTrue(a.compareAndSet(0, 1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(3, a.get(0)); |
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} |
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|
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/** |
160 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
161 |
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* to expected |
162 |
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*/ |
163 |
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public void testWeakCompareAndSet() { |
164 |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
165 |
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for (int i = 0; i < SIZE; i++) { |
166 |
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aa.set(i, 1); |
167 |
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do {} while (!aa.weakCompareAndSet(i, 1, 2)); |
168 |
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do {} while (!aa.weakCompareAndSet(i, 2, -4)); |
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assertEquals(-4, aa.get(i)); |
170 |
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do {} while (!aa.weakCompareAndSet(i, -4, 7)); |
171 |
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assertEquals(7, aa.get(i)); |
172 |
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} |
173 |
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} |
174 |
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|
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/** |
176 |
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* getAndSet returns previous value and sets to given value at given index |
177 |
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*/ |
178 |
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public void testGetAndSet() { |
179 |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
180 |
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for (int i = 0; i < SIZE; i++) { |
181 |
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aa.set(i, 1); |
182 |
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assertEquals(1, aa.getAndSet(i, 0)); |
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assertEquals(0, aa.getAndSet(i, -10)); |
184 |
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assertEquals(-10, aa.getAndSet(i, 1)); |
185 |
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} |
186 |
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} |
187 |
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|
188 |
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/** |
189 |
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* getAndAdd returns previous value and adds given value |
190 |
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*/ |
191 |
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public void testGetAndAdd() { |
192 |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
193 |
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for (int i = 0; i < SIZE; i++) { |
194 |
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aa.set(i, 1); |
195 |
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assertEquals(1, aa.getAndAdd(i, 2)); |
196 |
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assertEquals(3, aa.get(i)); |
197 |
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assertEquals(3, aa.getAndAdd(i, -4)); |
198 |
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assertEquals(-1, aa.get(i)); |
199 |
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} |
200 |
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} |
201 |
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|
202 |
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/** |
203 |
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* getAndDecrement returns previous value and decrements |
204 |
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*/ |
205 |
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public void testGetAndDecrement() { |
206 |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
207 |
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for (int i = 0; i < SIZE; i++) { |
208 |
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aa.set(i, 1); |
209 |
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assertEquals(1, aa.getAndDecrement(i)); |
210 |
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assertEquals(0, aa.getAndDecrement(i)); |
211 |
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assertEquals(-1, aa.getAndDecrement(i)); |
212 |
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} |
213 |
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} |
214 |
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|
215 |
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/** |
216 |
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* getAndIncrement returns previous value and increments |
217 |
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*/ |
218 |
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public void testGetAndIncrement() { |
219 |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
220 |
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for (int i = 0; i < SIZE; i++) { |
221 |
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aa.set(i, 1); |
222 |
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assertEquals(1, aa.getAndIncrement(i)); |
223 |
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assertEquals(2, aa.get(i)); |
224 |
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aa.set(i, -2); |
225 |
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assertEquals(-2, aa.getAndIncrement(i)); |
226 |
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assertEquals(-1, aa.getAndIncrement(i)); |
227 |
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assertEquals(0, aa.getAndIncrement(i)); |
228 |
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assertEquals(1, aa.get(i)); |
229 |
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} |
230 |
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} |
231 |
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|
232 |
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/** |
233 |
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* addAndGet adds given value to current, and returns current value |
234 |
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*/ |
235 |
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public void testAddAndGet() { |
236 |
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AtomicIntegerArray ai = new AtomicIntegerArray(N); |
237 |
< |
for (int i = 0; i < N; ++i) { |
238 |
< |
ai.set(i, 1); |
239 |
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assertEquals(3,ai.addAndGet(i,2)); |
240 |
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assertEquals(3,ai.get(i)); |
241 |
< |
assertEquals(-1,ai.addAndGet(i,-4)); |
242 |
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assertEquals(-1,ai.get(i)); |
236 |
> |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
237 |
> |
for (int i = 0; i < SIZE; i++) { |
238 |
> |
aa.set(i, 1); |
239 |
> |
assertEquals(3, aa.addAndGet(i, 2)); |
240 |
> |
assertEquals(3, aa.get(i)); |
241 |
> |
assertEquals(-1, aa.addAndGet(i, -4)); |
242 |
> |
assertEquals(-1, aa.get(i)); |
243 |
|
} |
244 |
|
} |
245 |
|
|
246 |
< |
public void testDecrementAndGet(){ |
247 |
< |
AtomicIntegerArray ai = new AtomicIntegerArray(N); |
248 |
< |
for (int i = 0; i < N; ++i) { |
249 |
< |
ai.set(i, 1); |
250 |
< |
assertEquals(0,ai.decrementAndGet(i)); |
251 |
< |
assertEquals(-1,ai.decrementAndGet(i)); |
252 |
< |
assertEquals(-2,ai.decrementAndGet(i)); |
253 |
< |
assertEquals(-2,ai.get(i)); |
246 |
> |
/** |
247 |
> |
* decrementAndGet decrements and returns current value |
248 |
> |
*/ |
249 |
> |
public void testDecrementAndGet() { |
250 |
> |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
251 |
> |
for (int i = 0; i < SIZE; i++) { |
252 |
> |
aa.set(i, 1); |
253 |
> |
assertEquals(0, aa.decrementAndGet(i)); |
254 |
> |
assertEquals(-1, aa.decrementAndGet(i)); |
255 |
> |
assertEquals(-2, aa.decrementAndGet(i)); |
256 |
> |
assertEquals(-2, aa.get(i)); |
257 |
|
} |
258 |
|
} |
259 |
|
|
260 |
+ |
/** |
261 |
+ |
* incrementAndGet increments and returns current value |
262 |
+ |
*/ |
263 |
|
public void testIncrementAndGet() { |
264 |
< |
AtomicIntegerArray ai = new AtomicIntegerArray(N); |
265 |
< |
for (int i = 0; i < N; ++i) { |
266 |
< |
ai.set(i, 1); |
267 |
< |
assertEquals(2,ai.incrementAndGet(i)); |
268 |
< |
assertEquals(2,ai.get(i)); |
269 |
< |
ai.set(i, -2); |
270 |
< |
assertEquals(-1,ai.incrementAndGet(i)); |
271 |
< |
assertEquals(0,ai.incrementAndGet(i)); |
272 |
< |
assertEquals(1,ai.incrementAndGet(i)); |
273 |
< |
assertEquals(1,ai.get(i)); |
264 |
> |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
265 |
> |
for (int i = 0; i < SIZE; i++) { |
266 |
> |
aa.set(i, 1); |
267 |
> |
assertEquals(2, aa.incrementAndGet(i)); |
268 |
> |
assertEquals(2, aa.get(i)); |
269 |
> |
aa.set(i, -2); |
270 |
> |
assertEquals(-1, aa.incrementAndGet(i)); |
271 |
> |
assertEquals(0, aa.incrementAndGet(i)); |
272 |
> |
assertEquals(1, aa.incrementAndGet(i)); |
273 |
> |
assertEquals(1, aa.get(i)); |
274 |
|
} |
275 |
|
} |
276 |
|
|
277 |
+ |
class Counter extends CheckedRunnable { |
278 |
+ |
final AtomicIntegerArray aa; |
279 |
+ |
volatile int counts; |
280 |
+ |
Counter(AtomicIntegerArray a) { aa = a; } |
281 |
+ |
public void realRun() { |
282 |
+ |
for (;;) { |
283 |
+ |
boolean done = true; |
284 |
+ |
for (int i = 0; i < aa.length(); i++) { |
285 |
+ |
int v = aa.get(i); |
286 |
+ |
assertTrue(v >= 0); |
287 |
+ |
if (v != 0) { |
288 |
+ |
done = false; |
289 |
+ |
if (aa.compareAndSet(i, v, v-1)) |
290 |
+ |
++counts; |
291 |
+ |
} |
292 |
+ |
} |
293 |
+ |
if (done) |
294 |
+ |
break; |
295 |
+ |
} |
296 |
+ |
} |
297 |
+ |
} |
298 |
+ |
|
299 |
+ |
/** |
300 |
+ |
* Multiple threads using same array of counters successfully |
301 |
+ |
* update a number of times equal to total count |
302 |
+ |
*/ |
303 |
+ |
public void testCountingInMultipleThreads() throws InterruptedException { |
304 |
+ |
final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
305 |
+ |
int countdown = 10000; |
306 |
+ |
for (int i = 0; i < SIZE; i++) |
307 |
+ |
aa.set(i, countdown); |
308 |
+ |
Counter c1 = new Counter(aa); |
309 |
+ |
Counter c2 = new Counter(aa); |
310 |
+ |
Thread t1 = new Thread(c1); |
311 |
+ |
Thread t2 = new Thread(c2); |
312 |
+ |
t1.start(); |
313 |
+ |
t2.start(); |
314 |
+ |
t1.join(); |
315 |
+ |
t2.join(); |
316 |
+ |
assertEquals(c1.counts+c2.counts, SIZE * countdown); |
317 |
+ |
} |
318 |
+ |
|
319 |
+ |
/** |
320 |
+ |
* a deserialized serialized array holds same values |
321 |
+ |
*/ |
322 |
+ |
public void testSerialization() throws Exception { |
323 |
+ |
AtomicIntegerArray x = new AtomicIntegerArray(SIZE); |
324 |
+ |
for (int i = 0; i < SIZE; i++) |
325 |
+ |
x.set(i, -i); |
326 |
+ |
AtomicIntegerArray y = serialClone(x); |
327 |
+ |
assertNotSame(x, y); |
328 |
+ |
assertEquals(x.length(), y.length()); |
329 |
+ |
for (int i = 0; i < SIZE; i++) { |
330 |
+ |
assertEquals(x.get(i), y.get(i)); |
331 |
+ |
} |
332 |
+ |
} |
333 |
+ |
|
334 |
+ |
/** |
335 |
+ |
* toString returns current value. |
336 |
+ |
*/ |
337 |
+ |
public void testToString() { |
338 |
+ |
int[] a = { 17, 3, -42, 99, -7 }; |
339 |
+ |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
340 |
+ |
assertEquals(Arrays.toString(a), aa.toString()); |
341 |
+ |
} |
342 |
+ |
|
343 |
|
} |