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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/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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* 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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return new TestSuite(AtomicIntegerTest.class); |
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} |
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|
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final int[] VALUES = { |
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Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, |
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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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public void testConstructor() { |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.get()); |
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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 initializes to zero |
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*/ |
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public void testConstructor2(){ |
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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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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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ai.set(2); |
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assertEquals(2,ai.get()); |
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ai.set(-3); |
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assertEquals(-3,ai.get()); |
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} |
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|
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/** |
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* get returns the last value lazySet in same thread |
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*/ |
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public void testGetLazySet(){ |
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public void testGetLazySet() { |
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AtomicInteger ai = new AtomicInteger(1); |
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assertEquals(1,ai.get()); |
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ai.lazySet(2); |
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assertEquals(2,ai.get()); |
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ai.lazySet(-3); |
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assertEquals(-3,ai.get()); |
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|
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assertEquals(1,ai.get()); |
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ai.lazySet(2); |
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assertEquals(2,ai.get()); |
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ai.lazySet(-3); |
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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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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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assertTrue(ai.compareAndSet(2,-4)); |
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assertEquals(-4,ai.get()); |
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assertFalse(ai.compareAndSet(-5,7)); |
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assertFalse((7 == ai.get())); |
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assertTrue(ai.compareAndSet(-4,7)); |
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assertEquals(7,ai.get()); |
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assertTrue(ai.compareAndSet(1,2)); |
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assertTrue(ai.compareAndSet(2,-4)); |
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assertEquals(-4,ai.get()); |
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assertFalse(ai.compareAndSet(-5,7)); |
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assertEquals(-4,ai.get()); |
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assertTrue(ai.compareAndSet(-4,7)); |
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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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public void testCompareAndSetInMultipleThreads() throws Exception { |
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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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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!ai.compareAndSet(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(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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|
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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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* to expected |
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*/ |
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public void testWeakCompareAndSet(){ |
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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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while(!ai.weakCompareAndSet(2,-4)); |
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assertEquals(-4,ai.get()); |
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while(!ai.weakCompareAndSet(-4,7)); |
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assertEquals(7,ai.get()); |
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while (!ai.weakCompareAndSet(1,2)); |
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while (!ai.weakCompareAndSet(2,-4)); |
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assertEquals(-4,ai.get()); |
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while (!ai.weakCompareAndSet(-4,7)); |
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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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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(0,ai.getAndSet(-10)); |
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assertEquals(-10,ai.getAndSet(1)); |
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assertEquals(1,ai.getAndSet(0)); |
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assertEquals(0,ai.getAndSet(-10)); |
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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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> |
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(3,ai.get()); |
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assertEquals(3,ai.getAndAdd(-4)); |
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assertEquals(-1,ai.get()); |
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assertEquals(1,ai.getAndAdd(2)); |
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assertEquals(3,ai.get()); |
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assertEquals(3,ai.getAndAdd(-4)); |
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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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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(0,ai.getAndDecrement()); |
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assertEquals(-1,ai.getAndDecrement()); |
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> |
assertEquals(1,ai.getAndDecrement()); |
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> |
assertEquals(0,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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> |
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(2,ai.get()); |
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< |
ai.set(-2); |
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< |
assertEquals(-2,ai.getAndIncrement()); |
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< |
assertEquals(-1,ai.getAndIncrement()); |
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assertEquals(0,ai.getAndIncrement()); |
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assertEquals(1,ai.get()); |
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assertEquals(1,ai.getAndIncrement()); |
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> |
assertEquals(2,ai.get()); |
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> |
ai.set(-2); |
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> |
assertEquals(-2,ai.getAndIncrement()); |
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> |
assertEquals(-1,ai.getAndIncrement()); |
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> |
assertEquals(0,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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> |
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(3,ai.get()); |
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assertEquals(-1,ai.addAndGet(-4)); |
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assertEquals(-1,ai.get()); |
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assertEquals(3,ai.addAndGet(2)); |
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assertEquals(3,ai.get()); |
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> |
assertEquals(-1,ai.addAndGet(-4)); |
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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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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(-1,ai.decrementAndGet()); |
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assertEquals(-2,ai.decrementAndGet()); |
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assertEquals(-2,ai.get()); |
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> |
assertEquals(0,ai.decrementAndGet()); |
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> |
assertEquals(-1,ai.decrementAndGet()); |
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assertEquals(-2,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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> |
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(2,ai.get()); |
185 |
< |
ai.set(-2); |
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< |
assertEquals(-1,ai.incrementAndGet()); |
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assertEquals(0,ai.incrementAndGet()); |
188 |
< |
assertEquals(1,ai.incrementAndGet()); |
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assertEquals(1,ai.get()); |
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> |
assertEquals(2,ai.incrementAndGet()); |
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> |
assertEquals(2,ai.get()); |
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> |
ai.set(-2); |
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> |
assertEquals(-1,ai.incrementAndGet()); |
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> |
assertEquals(0,ai.incrementAndGet()); |
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> |
assertEquals(1,ai.incrementAndGet()); |
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> |
assertEquals(1,ai.get()); |
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} |
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|
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/** |
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* a deserialized serialized atomic holds same value |
194 |
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*/ |
195 |
< |
public void testSerialization() { |
195 |
> |
public void testSerialization() throws Exception { |
196 |
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AtomicInteger l = new AtomicInteger(); |
197 |
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|
198 |
< |
try { |
199 |
< |
l.set(22); |
200 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
201 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
202 |
< |
out.writeObject(l); |
203 |
< |
out.close(); |
204 |
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|
205 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
206 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
207 |
< |
AtomicInteger r = (AtomicInteger) in.readObject(); |
195 |
< |
assertEquals(l.get(), r.get()); |
196 |
< |
} catch(Exception e){ |
197 |
< |
unexpectedException(); |
198 |
< |
} |
198 |
> |
l.set(22); |
199 |
> |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
200 |
> |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
201 |
> |
out.writeObject(l); |
202 |
> |
out.close(); |
203 |
> |
|
204 |
> |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
205 |
> |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
206 |
> |
AtomicInteger r = (AtomicInteger) in.readObject(); |
207 |
> |
assertEquals(l.get(), r.get()); |
208 |
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} |
209 |
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|
210 |
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/** |
211 |
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* toString returns current value. |
212 |
< |
*/ |
212 |
> |
*/ |
213 |
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public void testToString() { |
214 |
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AtomicInteger ai = new AtomicInteger(); |
215 |
< |
for (int i = -12; i < 6; ++i) { |
216 |
< |
ai.set(i); |
217 |
< |
assertEquals(ai.toString(), Integer.toString(i)); |
215 |
> |
assertEquals("0", ai.toString()); |
216 |
> |
for (int x : VALUES) { |
217 |
> |
ai.set(x); |
218 |
> |
assertEquals(ai.toString(), Integer.toString(x)); |
219 |
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} |
220 |
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} |
221 |
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|
222 |
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/** |
223 |
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* intValue returns current value. |
224 |
< |
*/ |
224 |
> |
*/ |
225 |
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public void testIntValue() { |
226 |
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AtomicInteger ai = new AtomicInteger(); |
227 |
< |
for (int i = -12; i < 6; ++i) { |
228 |
< |
ai.set(i); |
229 |
< |
assertEquals(i, ai.intValue()); |
227 |
> |
assertEquals(0, ai.intValue()); |
228 |
> |
for (int x : VALUES) { |
229 |
> |
ai.set(x); |
230 |
> |
assertEquals(x, ai.intValue()); |
231 |
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} |
232 |
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} |
233 |
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|
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|
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/** |
235 |
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* longValue returns current value. |
236 |
< |
*/ |
236 |
> |
*/ |
237 |
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public void testLongValue() { |
238 |
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AtomicInteger ai = new AtomicInteger(); |
239 |
< |
for (int i = -12; i < 6; ++i) { |
240 |
< |
ai.set(i); |
241 |
< |
assertEquals((long)i, ai.longValue()); |
239 |
> |
assertEquals(0L, ai.longValue()); |
240 |
> |
for (int x : VALUES) { |
241 |
> |
ai.set(x); |
242 |
> |
assertEquals((long)x, ai.longValue()); |
243 |
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} |
244 |
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} |
245 |
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|
246 |
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/** |
247 |
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* floatValue returns current value. |
248 |
< |
*/ |
248 |
> |
*/ |
249 |
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public void testFloatValue() { |
250 |
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AtomicInteger ai = new AtomicInteger(); |
251 |
< |
for (int i = -12; i < 6; ++i) { |
252 |
< |
ai.set(i); |
253 |
< |
assertEquals((float)i, ai.floatValue()); |
251 |
> |
assertEquals(0.0f, ai.floatValue()); |
252 |
> |
for (int x : VALUES) { |
253 |
> |
ai.set(x); |
254 |
> |
assertEquals((float)x, ai.floatValue()); |
255 |
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} |
256 |
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} |
257 |
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|
258 |
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/** |
259 |
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* doubleValue returns current value. |
260 |
< |
*/ |
260 |
> |
*/ |
261 |
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public void testDoubleValue() { |
262 |
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AtomicInteger ai = new AtomicInteger(); |
263 |
< |
for (int i = -12; i < 6; ++i) { |
264 |
< |
ai.set(i); |
265 |
< |
assertEquals((double)i, ai.doubleValue()); |
263 |
> |
assertEquals(0.0d, ai.doubleValue()); |
264 |
> |
for (int x : VALUES) { |
265 |
> |
ai.set(x); |
266 |
> |
assertEquals((double)x, ai.doubleValue()); |
267 |
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} |
268 |
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} |
269 |
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|
257 |
– |
|
258 |
– |
|
270 |
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} |