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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.io.*; |
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import java.util.Arrays; |
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import java.util.concurrent.atomic.AtomicLongArray; |
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|
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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 class AtomicLongArrayTest extends JSR166TestCase { |
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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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(AtomicLongArrayTest.class); |
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} |
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|
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public void testConstructor(){ |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++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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/** |
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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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AtomicLongArray aa = new AtomicLongArray(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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long[] a = null; |
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new AtomicLongArray(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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long[] a = { 17L, 3L, -42L, 99L, -7L }; |
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AtomicLongArray aa = new AtomicLongArray(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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AtomicLongArray aa = new AtomicLongArray(SIZE); |
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for (int index : new int[] { -1, SIZE }) { |
60 |
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try { |
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aa.get(index); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
64 |
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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(); |
71 |
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} catch (IndexOutOfBoundsException success) {} |
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try { |
73 |
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aa.compareAndSet(index, 1, 2); |
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shouldThrow(); |
75 |
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} catch (IndexOutOfBoundsException success) {} |
76 |
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try { |
77 |
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aa.weakCompareAndSet(index, 1, 2); |
78 |
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shouldThrow(); |
79 |
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} catch (IndexOutOfBoundsException success) {} |
80 |
+ |
try { |
81 |
+ |
aa.getAndAdd(index, 1); |
82 |
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shouldThrow(); |
83 |
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} catch (IndexOutOfBoundsException success) {} |
84 |
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try { |
85 |
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aa.addAndGet(index, 1); |
86 |
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shouldThrow(); |
87 |
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} catch (IndexOutOfBoundsException success) {} |
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} |
89 |
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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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AtomicLongArray aa = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
98 |
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assertEquals(1, aa.get(i)); |
99 |
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aa.set(i, 2); |
100 |
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assertEquals(2, aa.get(i)); |
101 |
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aa.set(i, -3); |
102 |
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assertEquals(-3, aa.get(i)); |
103 |
+ |
} |
104 |
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} |
105 |
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|
106 |
+ |
/** |
107 |
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* get returns the last value lazySet at index by same thread |
108 |
+ |
*/ |
109 |
+ |
public void testGetLazySet() { |
110 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
111 |
+ |
for (int i = 0; i < SIZE; i++) { |
112 |
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aa.lazySet(i, 1); |
113 |
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assertEquals(1, aa.get(i)); |
114 |
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aa.lazySet(i, 2); |
115 |
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assertEquals(2, aa.get(i)); |
116 |
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aa.lazySet(i, -3); |
117 |
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assertEquals(-3, aa.get(i)); |
118 |
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} |
119 |
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} |
120 |
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|
121 |
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/** |
122 |
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* compareAndSet succeeds in changing value if equal to expected else fails |
123 |
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*/ |
124 |
+ |
public void testCompareAndSet() { |
125 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
126 |
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for (int i = 0; i < SIZE; i++) { |
127 |
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aa.set(i, 1); |
128 |
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assertTrue(aa.compareAndSet(i, 1, 2)); |
129 |
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assertTrue(aa.compareAndSet(i, 2, -4)); |
130 |
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assertEquals(-4, aa.get(i)); |
131 |
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assertFalse(aa.compareAndSet(i, -5, 7)); |
132 |
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assertEquals(-4, aa.get(i)); |
133 |
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assertTrue(aa.compareAndSet(i, -4, 7)); |
134 |
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assertEquals(7, aa.get(i)); |
135 |
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} |
136 |
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} |
137 |
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|
138 |
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/** |
139 |
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* compareAndSet in one thread enables another waiting for value |
140 |
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* to succeed |
141 |
+ |
*/ |
142 |
+ |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
143 |
+ |
final AtomicLongArray a = new AtomicLongArray(1); |
144 |
+ |
a.set(0, 1); |
145 |
+ |
Thread t = new Thread(new CheckedRunnable() { |
146 |
+ |
public void realRun() { |
147 |
+ |
while (!a.compareAndSet(0, 2, 3)) |
148 |
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Thread.yield(); |
149 |
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}}); |
150 |
+ |
|
151 |
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t.start(); |
152 |
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assertTrue(a.compareAndSet(0, 1, 2)); |
153 |
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t.join(LONG_DELAY_MS); |
154 |
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assertFalse(t.isAlive()); |
155 |
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assertEquals(3, a.get(0)); |
156 |
+ |
} |
157 |
+ |
|
158 |
+ |
/** |
159 |
+ |
* repeated weakCompareAndSet succeeds in changing value when equal |
160 |
+ |
* to expected |
161 |
+ |
*/ |
162 |
+ |
public void testWeakCompareAndSet() { |
163 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
164 |
+ |
for (int i = 0; i < SIZE; i++) { |
165 |
+ |
aa.set(i, 1); |
166 |
+ |
do {} while (!aa.weakCompareAndSet(i, 1, 2)); |
167 |
+ |
do {} while (!aa.weakCompareAndSet(i, 2, -4)); |
168 |
+ |
assertEquals(-4, aa.get(i)); |
169 |
+ |
do {} while (!aa.weakCompareAndSet(i, -4, 7)); |
170 |
+ |
assertEquals(7, aa.get(i)); |
171 |
+ |
} |
172 |
+ |
} |
173 |
+ |
|
174 |
+ |
/** |
175 |
+ |
* getAndSet returns previous value and sets to given value at given index |
176 |
+ |
*/ |
177 |
+ |
public void testGetAndSet() { |
178 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
179 |
+ |
for (int i = 0; i < SIZE; i++) { |
180 |
+ |
aa.set(i, 1); |
181 |
+ |
assertEquals(1, aa.getAndSet(i, 0)); |
182 |
+ |
assertEquals(0, aa.getAndSet(i, -10)); |
183 |
+ |
assertEquals(-10, aa.getAndSet(i, 1)); |
184 |
+ |
} |
185 |
+ |
} |
186 |
+ |
|
187 |
+ |
/** |
188 |
+ |
* getAndAdd returns previous value and adds given value |
189 |
+ |
*/ |
190 |
+ |
public void testGetAndAdd() { |
191 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
192 |
+ |
for (int i = 0; i < SIZE; i++) { |
193 |
+ |
aa.set(i, 1); |
194 |
+ |
assertEquals(1, aa.getAndAdd(i, 2)); |
195 |
+ |
assertEquals(3, aa.get(i)); |
196 |
+ |
assertEquals(3, aa.getAndAdd(i, -4)); |
197 |
+ |
assertEquals(-1, aa.get(i)); |
198 |
+ |
} |
199 |
+ |
} |
200 |
+ |
|
201 |
+ |
/** |
202 |
+ |
* getAndDecrement returns previous value and decrements |
203 |
+ |
*/ |
204 |
+ |
public void testGetAndDecrement() { |
205 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
206 |
+ |
for (int i = 0; i < SIZE; i++) { |
207 |
+ |
aa.set(i, 1); |
208 |
+ |
assertEquals(1, aa.getAndDecrement(i)); |
209 |
+ |
assertEquals(0, aa.getAndDecrement(i)); |
210 |
+ |
assertEquals(-1, aa.getAndDecrement(i)); |
211 |
+ |
} |
212 |
+ |
} |
213 |
+ |
|
214 |
+ |
/** |
215 |
+ |
* getAndIncrement returns previous value and increments |
216 |
+ |
*/ |
217 |
+ |
public void testGetAndIncrement() { |
218 |
+ |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
219 |
+ |
for (int i = 0; i < SIZE; i++) { |
220 |
+ |
aa.set(i, 1); |
221 |
+ |
assertEquals(1, aa.getAndIncrement(i)); |
222 |
+ |
assertEquals(2, aa.get(i)); |
223 |
+ |
aa.set(i, -2); |
224 |
+ |
assertEquals(-2, aa.getAndIncrement(i)); |
225 |
+ |
assertEquals(-1, aa.getAndIncrement(i)); |
226 |
+ |
assertEquals(0, aa.getAndIncrement(i)); |
227 |
+ |
assertEquals(1, aa.get(i)); |
228 |
+ |
} |
229 |
+ |
} |
230 |
+ |
|
231 |
+ |
/** |
232 |
+ |
* addAndGet adds given value to current, and returns current value |
233 |
+ |
*/ |
234 |
|
public void testAddAndGet() { |
235 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
236 |
< |
for (int i = 0; i < SIZE; ++i) { |
237 |
< |
ai.set(i, 1); |
238 |
< |
assertEquals(3,ai.addAndGet(i,2)); |
239 |
< |
assertEquals(3,ai.get(i)); |
240 |
< |
assertEquals(-1,ai.addAndGet(i,-4)); |
241 |
< |
assertEquals(-1,ai.get(i)); |
235 |
> |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
236 |
> |
for (int i = 0; i < SIZE; i++) { |
237 |
> |
aa.set(i, 1); |
238 |
> |
assertEquals(3, aa.addAndGet(i, 2)); |
239 |
> |
assertEquals(3, aa.get(i)); |
240 |
> |
assertEquals(-1, aa.addAndGet(i, -4)); |
241 |
> |
assertEquals(-1, aa.get(i)); |
242 |
|
} |
243 |
|
} |
244 |
|
|
245 |
< |
public void testDecrementAndGet(){ |
246 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
247 |
< |
for (int i = 0; i < SIZE; ++i) { |
248 |
< |
ai.set(i, 1); |
249 |
< |
assertEquals(0,ai.decrementAndGet(i)); |
250 |
< |
assertEquals(-1,ai.decrementAndGet(i)); |
251 |
< |
assertEquals(-2,ai.decrementAndGet(i)); |
252 |
< |
assertEquals(-2,ai.get(i)); |
245 |
> |
/** |
246 |
> |
* decrementAndGet decrements and returns current value |
247 |
> |
*/ |
248 |
> |
public void testDecrementAndGet() { |
249 |
> |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
250 |
> |
for (int i = 0; i < SIZE; i++) { |
251 |
> |
aa.set(i, 1); |
252 |
> |
assertEquals(0, aa.decrementAndGet(i)); |
253 |
> |
assertEquals(-1, aa.decrementAndGet(i)); |
254 |
> |
assertEquals(-2, aa.decrementAndGet(i)); |
255 |
> |
assertEquals(-2, aa.get(i)); |
256 |
|
} |
257 |
|
} |
258 |
|
|
259 |
+ |
/** |
260 |
+ |
* incrementAndGet increments and returns current value |
261 |
+ |
*/ |
262 |
|
public void testIncrementAndGet() { |
263 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
264 |
< |
for (int i = 0; i < SIZE; ++i) { |
265 |
< |
ai.set(i, 1); |
266 |
< |
assertEquals(2,ai.incrementAndGet(i)); |
267 |
< |
assertEquals(2,ai.get(i)); |
268 |
< |
ai.set(i, -2); |
269 |
< |
assertEquals(-1,ai.incrementAndGet(i)); |
270 |
< |
assertEquals(0,ai.incrementAndGet(i)); |
271 |
< |
assertEquals(1,ai.incrementAndGet(i)); |
272 |
< |
assertEquals(1,ai.get(i)); |
263 |
> |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
264 |
> |
for (int i = 0; i < SIZE; i++) { |
265 |
> |
aa.set(i, 1); |
266 |
> |
assertEquals(2, aa.incrementAndGet(i)); |
267 |
> |
assertEquals(2, aa.get(i)); |
268 |
> |
aa.set(i, -2); |
269 |
> |
assertEquals(-1, aa.incrementAndGet(i)); |
270 |
> |
assertEquals(0, aa.incrementAndGet(i)); |
271 |
> |
assertEquals(1, aa.incrementAndGet(i)); |
272 |
> |
assertEquals(1, aa.get(i)); |
273 |
|
} |
274 |
|
} |
275 |
|
|
276 |
< |
static final long COUNTDOWN = 100000; |
277 |
< |
|
278 |
< |
class Counter implements Runnable { |
279 |
< |
final AtomicLongArray ai; |
280 |
< |
volatile long counts; |
150 |
< |
Counter(AtomicLongArray a) { ai = a; } |
151 |
< |
public void run() { |
276 |
> |
class Counter extends CheckedRunnable { |
277 |
> |
final AtomicLongArray aa; |
278 |
> |
int decs; |
279 |
> |
Counter(AtomicLongArray a) { aa = a; } |
280 |
> |
public void realRun() { |
281 |
|
for (;;) { |
282 |
|
boolean done = true; |
283 |
< |
for (int i = 0; i < ai.length(); ++i) { |
284 |
< |
long v = ai.get(i); |
285 |
< |
threadAssertTrue(v >= 0); |
283 |
> |
for (int i = 0; i < aa.length(); i++) { |
284 |
> |
long v = aa.get(i); |
285 |
> |
assertTrue(v >= 0); |
286 |
|
if (v != 0) { |
287 |
|
done = false; |
288 |
< |
if (ai.compareAndSet(i, v, v-1)) |
289 |
< |
++counts; |
288 |
> |
if (aa.compareAndSet(i, v, v - 1)) |
289 |
> |
decs++; |
290 |
|
} |
291 |
|
} |
292 |
|
if (done) |
295 |
|
} |
296 |
|
} |
297 |
|
|
298 |
< |
public void testCountingInMultipleThreads() { |
299 |
< |
try { |
300 |
< |
final AtomicLongArray ai = new AtomicLongArray(SIZE); |
301 |
< |
for (int i = 0; i < SIZE; ++i) |
302 |
< |
ai.set(i, COUNTDOWN); |
303 |
< |
Counter c1 = new Counter(ai); |
304 |
< |
Counter c2 = new Counter(ai); |
305 |
< |
Thread t1 = new Thread(c1); |
306 |
< |
Thread t2 = new Thread(c2); |
307 |
< |
t1.start(); |
308 |
< |
t2.start(); |
309 |
< |
t1.join(); |
310 |
< |
t2.join(); |
311 |
< |
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
312 |
< |
} |
313 |
< |
catch(InterruptedException ie) { |
314 |
< |
fail("unexpected exception"); |
298 |
> |
/** |
299 |
> |
* Multiple threads using same array of counters successfully |
300 |
> |
* update a number of times equal to total count |
301 |
> |
*/ |
302 |
> |
public void testCountingInMultipleThreads() throws InterruptedException { |
303 |
> |
final AtomicLongArray aa = new AtomicLongArray(SIZE); |
304 |
> |
long countdown = 10000; |
305 |
> |
for (int i = 0; i < SIZE; i++) |
306 |
> |
aa.set(i, countdown); |
307 |
> |
Counter c1 = new Counter(aa); |
308 |
> |
Counter c2 = new Counter(aa); |
309 |
> |
Thread t1 = newStartedThread(c1); |
310 |
> |
Thread t2 = newStartedThread(c2); |
311 |
> |
t1.join(); |
312 |
> |
t2.join(); |
313 |
> |
assertEquals(c1.decs + c2.decs, SIZE * countdown); |
314 |
> |
} |
315 |
> |
|
316 |
> |
/** |
317 |
> |
* a deserialized/reserialized array holds same values in same order |
318 |
> |
*/ |
319 |
> |
public void testSerialization() throws Exception { |
320 |
> |
AtomicLongArray x = new AtomicLongArray(SIZE); |
321 |
> |
for (int i = 0; i < SIZE; i++) |
322 |
> |
x.set(i, -i); |
323 |
> |
AtomicLongArray y = serialClone(x); |
324 |
> |
assertNotSame(x, y); |
325 |
> |
assertEquals(x.length(), y.length()); |
326 |
> |
for (int i = 0; i < SIZE; i++) { |
327 |
> |
assertEquals(x.get(i), y.get(i)); |
328 |
|
} |
329 |
|
} |
330 |
|
|
331 |
< |
public void testSerialization() { |
332 |
< |
AtomicLongArray l = new AtomicLongArray(SIZE); |
333 |
< |
for (int i = 0; i < SIZE; ++i) |
334 |
< |
l.set(i, -i); |
335 |
< |
|
336 |
< |
try { |
337 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
196 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
197 |
< |
out.writeObject(l); |
198 |
< |
out.close(); |
199 |
< |
|
200 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
201 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
202 |
< |
AtomicLongArray r = (AtomicLongArray) in.readObject(); |
203 |
< |
for (int i = 0; i < SIZE; ++i) { |
204 |
< |
assertEquals(l.get(i), r.get(i)); |
205 |
< |
} |
206 |
< |
} catch(Exception e){ |
207 |
< |
e.printStackTrace(); |
208 |
< |
fail("unexpected exception"); |
209 |
< |
} |
331 |
> |
/** |
332 |
> |
* toString returns current value. |
333 |
> |
*/ |
334 |
> |
public void testToString() { |
335 |
> |
long[] a = { 17, 3, -42, 99, -7 }; |
336 |
> |
AtomicLongArray aa = new AtomicLongArray(a); |
337 |
> |
assertEquals(Arrays.toString(a), aa.toString()); |
338 |
|
} |
339 |
|
|
212 |
– |
|
340 |
|
} |