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dl |
1.1 |
/* |
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dl |
1.6 |
* 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/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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dl |
1.1 |
*/ |
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import junit.framework.*; |
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import java.util.concurrent.atomic.*; |
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dl |
1.2 |
import java.io.*; |
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dl |
1.1 |
|
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1.3 |
public class AtomicIntegerArrayTest extends JSR166TestCase { |
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dl |
1.1 |
|
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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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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dl |
1.3 |
|
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dl |
1.4 |
/** |
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1.5 |
* constructor creates array of given size with all elements zero |
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dl |
1.4 |
*/ |
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public void testConstructor() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) |
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1.1 |
assertEquals(0,ai.get(i)); |
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} |
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dl |
1.4 |
/** |
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1.5 |
* 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 ai = new AtomicIntegerArray(SIZE); |
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try { |
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ai.get(SIZE); |
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} catch(IndexOutOfBoundsException success){ |
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} |
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try { |
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ai.get(-1); |
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} catch(IndexOutOfBoundsException success){ |
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} |
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try { |
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ai.set(SIZE, 0); |
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} catch(IndexOutOfBoundsException success){ |
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} |
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try { |
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ai.set(-1, 0); |
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} catch(IndexOutOfBoundsException success){ |
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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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1.4 |
*/ |
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public void testGetSet() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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1.1 |
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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1.4 |
/** |
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1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
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1.4 |
*/ |
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public void testCompareAndSet() { |
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1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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1.1 |
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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1.4 |
/** |
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1.5 |
* compareAndSet in one thread enables another waiting for value |
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* to succeed |
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*/ |
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public void testCompareAndSetInMultipleThreads() { |
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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 Runnable() { |
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public void run() { |
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while(!a.compareAndSet(0, 2, 3)) Thread.yield(); |
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}}); |
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try { |
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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(a.get(0), 3); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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} |
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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
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* to expected |
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1.4 |
*/ |
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public void testWeakCompareAndSet() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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1.1 |
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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dl |
1.4 |
/** |
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dl |
1.5 |
* getAndSet returns previous value and sets to given value at given index |
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dl |
1.4 |
*/ |
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public void testGetAndSet() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
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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dl |
1.4 |
/** |
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dl |
1.5 |
* getAndAdd returns previous value and adds given value |
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dl |
1.4 |
*/ |
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public void testGetAndAdd() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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1.1 |
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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dl |
1.4 |
/** |
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dl |
1.5 |
* getAndDecrement returns previous value and decrements |
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dl |
1.4 |
*/ |
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public void testGetAndDecrement() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
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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dl |
1.4 |
/** |
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dl |
1.5 |
* getAndIncrement returns previous value and increments |
168 |
dl |
1.4 |
*/ |
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public void testGetAndIncrement() { |
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dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
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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dl |
1.4 |
/** |
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dl |
1.5 |
* addAndGet adds given value to current, and returns current value |
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dl |
1.4 |
*/ |
186 |
dl |
1.1 |
public void testAddAndGet() { |
187 |
dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
ai.set(i, 1); |
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assertEquals(3,ai.addAndGet(i,2)); |
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assertEquals(3,ai.get(i)); |
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assertEquals(-1,ai.addAndGet(i,-4)); |
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assertEquals(-1,ai.get(i)); |
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} |
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} |
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dl |
1.4 |
/** |
198 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
199 |
dl |
1.4 |
*/ |
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public void testDecrementAndGet() { |
201 |
dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
203 |
dl |
1.1 |
ai.set(i, 1); |
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assertEquals(0,ai.decrementAndGet(i)); |
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assertEquals(-1,ai.decrementAndGet(i)); |
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assertEquals(-2,ai.decrementAndGet(i)); |
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assertEquals(-2,ai.get(i)); |
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} |
209 |
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} |
210 |
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211 |
dl |
1.4 |
/** |
212 |
dl |
1.5 |
* incrementAndGet increments and returns current value |
213 |
dl |
1.4 |
*/ |
214 |
dl |
1.1 |
public void testIncrementAndGet() { |
215 |
dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
216 |
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for (int i = 0; i < SIZE; ++i) { |
217 |
dl |
1.1 |
ai.set(i, 1); |
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assertEquals(2,ai.incrementAndGet(i)); |
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assertEquals(2,ai.get(i)); |
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ai.set(i, -2); |
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assertEquals(-1,ai.incrementAndGet(i)); |
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assertEquals(0,ai.incrementAndGet(i)); |
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assertEquals(1,ai.incrementAndGet(i)); |
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assertEquals(1,ai.get(i)); |
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dl |
1.2 |
} |
226 |
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} |
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228 |
dl |
1.3 |
static final int COUNTDOWN = 100000; |
229 |
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230 |
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class Counter implements Runnable { |
231 |
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final AtomicIntegerArray ai; |
232 |
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volatile int counts; |
233 |
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Counter(AtomicIntegerArray a) { ai = a; } |
234 |
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public void run() { |
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for (;;) { |
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boolean done = true; |
237 |
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for (int i = 0; i < ai.length(); ++i) { |
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int v = ai.get(i); |
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threadAssertTrue(v >= 0); |
240 |
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if (v != 0) { |
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done = false; |
242 |
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if (ai.compareAndSet(i, v, v-1)) |
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++counts; |
244 |
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} |
245 |
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} |
246 |
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if (done) |
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break; |
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} |
249 |
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} |
250 |
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} |
251 |
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252 |
dl |
1.4 |
/** |
253 |
dl |
1.5 |
* Multiple threads using same array of counters successfully |
254 |
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* update a number of times equal to total count |
255 |
dl |
1.4 |
*/ |
256 |
dl |
1.3 |
public void testCountingInMultipleThreads() { |
257 |
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try { |
258 |
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final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
259 |
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for (int i = 0; i < SIZE; ++i) |
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ai.set(i, COUNTDOWN); |
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Counter c1 = new Counter(ai); |
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Counter c2 = new Counter(ai); |
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Thread t1 = new Thread(c1); |
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Thread t2 = new Thread(c2); |
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t1.start(); |
266 |
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t2.start(); |
267 |
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t1.join(); |
268 |
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t2.join(); |
269 |
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assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
270 |
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} |
271 |
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catch(InterruptedException ie) { |
272 |
dl |
1.4 |
unexpectedException(); |
273 |
dl |
1.3 |
} |
274 |
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} |
275 |
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276 |
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277 |
dl |
1.4 |
/** |
278 |
dl |
1.5 |
* a deserialized serialized array holds same values |
279 |
dl |
1.4 |
*/ |
280 |
dl |
1.2 |
public void testSerialization() { |
281 |
dl |
1.3 |
AtomicIntegerArray l = new AtomicIntegerArray(SIZE); |
282 |
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for (int i = 0; i < SIZE; ++i) |
283 |
dl |
1.2 |
l.set(i, -i); |
284 |
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285 |
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try { |
286 |
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ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
287 |
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ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
288 |
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out.writeObject(l); |
289 |
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out.close(); |
290 |
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291 |
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ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
292 |
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ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
293 |
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AtomicIntegerArray r = (AtomicIntegerArray) in.readObject(); |
294 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
295 |
dl |
1.2 |
assertEquals(l.get(i), r.get(i)); |
296 |
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} |
297 |
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} catch(Exception e){ |
298 |
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e.printStackTrace(); |
299 |
dl |
1.4 |
unexpectedException(); |
300 |
dl |
1.1 |
} |
301 |
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} |
302 |
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303 |
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} |