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import java.util.concurrent.atomic.*; |
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import java.io.*; |
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< |
public class AtomicIntegerTest extends TestCase { |
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public class AtomicIntegerTest 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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} |
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return new TestSuite(AtomicIntegerTest.class); |
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} |
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|
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/** |
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* constructor initializes to given value |
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*/ |
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public void testConstructor(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.get()); |
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} |
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|
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/** |
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* default constructed intializes to zero |
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*/ |
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public void testConstructor2(){ |
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AtomicInteger ai = new AtomicInteger(); |
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assertEquals(0,ai.get()); |
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} |
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|
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/** |
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* get returns the last value set |
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*/ |
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public void testGetSet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.get()); |
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assertEquals(-3,ai.get()); |
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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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AtomicInteger ai = new AtomicInteger(1); |
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assertTrue(ai.compareAndSet(1,2)); |
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assertEquals(7,ai.get()); |
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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 |
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*/ |
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public void testCompareAndSetInMultipleThreads() { |
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final AtomicInteger ai = new AtomicInteger(1); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!ai.compareAndSet(2, 3)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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assertTrue(ai.compareAndSet(1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(ai.get(), 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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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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while(!ai.weakCompareAndSet(1,2)); |
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assertEquals(7,ai.get()); |
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} |
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|
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/** |
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* getAndSet returns previous value and sets to given value |
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*/ |
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public void testGetAndSet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.getAndSet(0)); |
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assertEquals(-10,ai.getAndSet(1)); |
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} |
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|
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/** |
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* getAndAdd returns previous value and adds given value |
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*/ |
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public void testGetAndAdd(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.getAndAdd(2)); |
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assertEquals(-1,ai.get()); |
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} |
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|
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/** |
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* getAndDecrement returns previous value and decrements |
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*/ |
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public void testGetAndDecrement(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.getAndDecrement()); |
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assertEquals(-1,ai.getAndDecrement()); |
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} |
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|
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/** |
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* getAndIncrement returns previous value and increments |
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*/ |
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public void testGetAndIncrement(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.getAndIncrement()); |
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assertEquals(1,ai.get()); |
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} |
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|
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/** |
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* addAndGet adds given value to current, and returns current value |
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*/ |
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public void testAddAndGet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(3,ai.addAndGet(2)); |
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assertEquals(-1,ai.get()); |
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} |
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|
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/** |
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* decrementAndGet decrements and returns current value |
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*/ |
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public void testDecrementAndGet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(0,ai.decrementAndGet()); |
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assertEquals(-2,ai.get()); |
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} |
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|
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/** |
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* incrementAndGet increments and returns current value |
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*/ |
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public void testIncrementAndGet(){ |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(2,ai.incrementAndGet()); |
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assertEquals(1,ai.get()); |
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} |
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/** |
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* a deserialized serialized atomic holds same value |
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*/ |
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public void testSerialization() { |
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AtomicInteger l = new AtomicInteger(); |
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|
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AtomicInteger r = (AtomicInteger) in.readObject(); |
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assertEquals(l.get(), r.get()); |
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} catch(Exception e){ |
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e.printStackTrace(); |
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fail("unexpected exception"); |
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unexpectedException(); |
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} |
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} |
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