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/* |
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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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* 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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|
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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.concurrent.atomic.AtomicInteger; |
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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 AtomicIntegerTest extends JSR166TestCase { |
15 |
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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(AtomicIntegerTest.class); |
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} |
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|
22 |
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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 |
28 |
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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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assertEquals(1, ai.get()); |
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} |
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|
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/** |
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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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assertEquals(0, ai.get()); |
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} |
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|
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/** |
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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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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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*/ |
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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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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() { |
87 |
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public void realRun() { |
88 |
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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(3, ai.get()); |
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} |
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|
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/** |
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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)); |
106 |
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while (!ai.weakCompareAndSet(2,-4)); |
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assertEquals(-4,ai.get()); |
108 |
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while (!ai.weakCompareAndSet(-4,7)); |
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assertEquals(7,ai.get()); |
105 |
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do {} while (!ai.weakCompareAndSet(1, 2)); |
106 |
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do {} while (!ai.weakCompareAndSet(2, -4)); |
107 |
> |
assertEquals(-4, ai.get()); |
108 |
> |
do {} while (!ai.weakCompareAndSet(-4, 7)); |
109 |
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assertEquals(7, ai.get()); |
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} |
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|
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/** |
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*/ |
115 |
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public void testGetAndSet() { |
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AtomicInteger ai = new AtomicInteger(1); |
117 |
< |
assertEquals(1,ai.getAndSet(0)); |
118 |
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assertEquals(0,ai.getAndSet(-10)); |
119 |
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assertEquals(-10,ai.getAndSet(1)); |
117 |
> |
assertEquals(1, ai.getAndSet(0)); |
118 |
> |
assertEquals(0, ai.getAndSet(-10)); |
119 |
> |
assertEquals(-10, ai.getAndSet(1)); |
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} |
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|
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/** |
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*/ |
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public void testGetAndAdd() { |
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AtomicInteger ai = new AtomicInteger(1); |
127 |
< |
assertEquals(1,ai.getAndAdd(2)); |
128 |
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assertEquals(3,ai.get()); |
129 |
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assertEquals(3,ai.getAndAdd(-4)); |
130 |
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assertEquals(-1,ai.get()); |
127 |
> |
assertEquals(1, ai.getAndAdd(2)); |
128 |
> |
assertEquals(3, ai.get()); |
129 |
> |
assertEquals(3, ai.getAndAdd(-4)); |
130 |
> |
assertEquals(-1, ai.get()); |
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} |
132 |
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|
133 |
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/** |
135 |
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*/ |
136 |
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public void testGetAndDecrement() { |
137 |
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AtomicInteger ai = new AtomicInteger(1); |
138 |
< |
assertEquals(1,ai.getAndDecrement()); |
139 |
< |
assertEquals(0,ai.getAndDecrement()); |
140 |
< |
assertEquals(-1,ai.getAndDecrement()); |
138 |
> |
assertEquals(1, ai.getAndDecrement()); |
139 |
> |
assertEquals(0, ai.getAndDecrement()); |
140 |
> |
assertEquals(-1, ai.getAndDecrement()); |
141 |
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} |
142 |
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|
143 |
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/** |
145 |
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*/ |
146 |
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public void testGetAndIncrement() { |
147 |
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AtomicInteger ai = new AtomicInteger(1); |
148 |
< |
assertEquals(1,ai.getAndIncrement()); |
149 |
< |
assertEquals(2,ai.get()); |
150 |
< |
ai.set(-2); |
151 |
< |
assertEquals(-2,ai.getAndIncrement()); |
152 |
< |
assertEquals(-1,ai.getAndIncrement()); |
153 |
< |
assertEquals(0,ai.getAndIncrement()); |
154 |
< |
assertEquals(1,ai.get()); |
148 |
> |
assertEquals(1, ai.getAndIncrement()); |
149 |
> |
assertEquals(2, ai.get()); |
150 |
> |
ai.set(-2); |
151 |
> |
assertEquals(-2, ai.getAndIncrement()); |
152 |
> |
assertEquals(-1, ai.getAndIncrement()); |
153 |
> |
assertEquals(0, ai.getAndIncrement()); |
154 |
> |
assertEquals(1, ai.get()); |
155 |
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} |
156 |
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|
157 |
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/** |
159 |
|
*/ |
160 |
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public void testAddAndGet() { |
161 |
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AtomicInteger ai = new AtomicInteger(1); |
162 |
< |
assertEquals(3,ai.addAndGet(2)); |
163 |
< |
assertEquals(3,ai.get()); |
164 |
< |
assertEquals(-1,ai.addAndGet(-4)); |
165 |
< |
assertEquals(-1,ai.get()); |
162 |
> |
assertEquals(3, ai.addAndGet(2)); |
163 |
> |
assertEquals(3, ai.get()); |
164 |
> |
assertEquals(-1, ai.addAndGet(-4)); |
165 |
> |
assertEquals(-1, ai.get()); |
166 |
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} |
167 |
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|
168 |
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/** |
170 |
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*/ |
171 |
|
public void testDecrementAndGet() { |
172 |
|
AtomicInteger ai = new AtomicInteger(1); |
173 |
< |
assertEquals(0,ai.decrementAndGet()); |
174 |
< |
assertEquals(-1,ai.decrementAndGet()); |
175 |
< |
assertEquals(-2,ai.decrementAndGet()); |
176 |
< |
assertEquals(-2,ai.get()); |
173 |
> |
assertEquals(0, ai.decrementAndGet()); |
174 |
> |
assertEquals(-1, ai.decrementAndGet()); |
175 |
> |
assertEquals(-2, ai.decrementAndGet()); |
176 |
> |
assertEquals(-2, ai.get()); |
177 |
|
} |
178 |
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|
179 |
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/** |
181 |
|
*/ |
182 |
|
public void testIncrementAndGet() { |
183 |
|
AtomicInteger ai = new AtomicInteger(1); |
184 |
< |
assertEquals(2,ai.incrementAndGet()); |
185 |
< |
assertEquals(2,ai.get()); |
186 |
< |
ai.set(-2); |
187 |
< |
assertEquals(-1,ai.incrementAndGet()); |
188 |
< |
assertEquals(0,ai.incrementAndGet()); |
189 |
< |
assertEquals(1,ai.incrementAndGet()); |
190 |
< |
assertEquals(1,ai.get()); |
184 |
> |
assertEquals(2, ai.incrementAndGet()); |
185 |
> |
assertEquals(2, ai.get()); |
186 |
> |
ai.set(-2); |
187 |
> |
assertEquals(-1, ai.incrementAndGet()); |
188 |
> |
assertEquals(0, ai.incrementAndGet()); |
189 |
> |
assertEquals(1, ai.incrementAndGet()); |
190 |
> |
assertEquals(1, ai.get()); |
191 |
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} |
192 |
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|
193 |
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/** |
194 |
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* a deserialized serialized atomic holds same value |
195 |
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*/ |
196 |
< |
public void testSerialization() { |
197 |
< |
AtomicInteger l = new AtomicInteger(); |
198 |
< |
|
199 |
< |
try { |
200 |
< |
l.set(22); |
201 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
202 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
203 |
< |
out.writeObject(l); |
204 |
< |
out.close(); |
204 |
< |
|
205 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
206 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
207 |
< |
AtomicInteger r = (AtomicInteger) in.readObject(); |
208 |
< |
assertEquals(l.get(), r.get()); |
209 |
< |
} catch (Exception e) { |
210 |
< |
unexpectedException(); |
211 |
< |
} |
196 |
> |
public void testSerialization() throws Exception { |
197 |
> |
AtomicInteger x = new AtomicInteger(); |
198 |
> |
AtomicInteger y = serialClone(x); |
199 |
> |
assertNotSame(x, y); |
200 |
> |
x.set(22); |
201 |
> |
AtomicInteger z = serialClone(x); |
202 |
> |
assertEquals(22, x.get()); |
203 |
> |
assertEquals(0, y.get()); |
204 |
> |
assertEquals(22, z.get()); |
205 |
|
} |
206 |
|
|
207 |
|
/** |
209 |
|
*/ |
210 |
|
public void testToString() { |
211 |
|
AtomicInteger ai = new AtomicInteger(); |
212 |
< |
for (int i = -12; i < 6; ++i) { |
213 |
< |
ai.set(i); |
214 |
< |
assertEquals(ai.toString(), Integer.toString(i)); |
212 |
> |
assertEquals("0", ai.toString()); |
213 |
> |
for (int x : VALUES) { |
214 |
> |
ai.set(x); |
215 |
> |
assertEquals(Integer.toString(x), ai.toString()); |
216 |
|
} |
217 |
|
} |
218 |
|
|
221 |
|
*/ |
222 |
|
public void testIntValue() { |
223 |
|
AtomicInteger ai = new AtomicInteger(); |
224 |
< |
for (int i = -12; i < 6; ++i) { |
225 |
< |
ai.set(i); |
226 |
< |
assertEquals(i, ai.intValue()); |
224 |
> |
assertEquals(0, ai.intValue()); |
225 |
> |
for (int x : VALUES) { |
226 |
> |
ai.set(x); |
227 |
> |
assertEquals(x, ai.intValue()); |
228 |
|
} |
229 |
|
} |
230 |
|
|
236 |
– |
|
231 |
|
/** |
232 |
|
* longValue returns current value. |
233 |
|
*/ |
234 |
|
public void testLongValue() { |
235 |
|
AtomicInteger ai = new AtomicInteger(); |
236 |
< |
for (int i = -12; i < 6; ++i) { |
237 |
< |
ai.set(i); |
238 |
< |
assertEquals((long)i, ai.longValue()); |
236 |
> |
assertEquals(0L, ai.longValue()); |
237 |
> |
for (int x : VALUES) { |
238 |
> |
ai.set(x); |
239 |
> |
assertEquals((long)x, ai.longValue()); |
240 |
|
} |
241 |
|
} |
242 |
|
|
245 |
|
*/ |
246 |
|
public void testFloatValue() { |
247 |
|
AtomicInteger ai = new AtomicInteger(); |
248 |
< |
for (int i = -12; i < 6; ++i) { |
249 |
< |
ai.set(i); |
250 |
< |
assertEquals((float)i, ai.floatValue()); |
248 |
> |
assertEquals(0.0f, ai.floatValue()); |
249 |
> |
for (int x : VALUES) { |
250 |
> |
ai.set(x); |
251 |
> |
assertEquals((float)x, ai.floatValue()); |
252 |
|
} |
253 |
|
} |
254 |
|
|
257 |
|
*/ |
258 |
|
public void testDoubleValue() { |
259 |
|
AtomicInteger ai = new AtomicInteger(); |
260 |
< |
for (int i = -12; i < 6; ++i) { |
261 |
< |
ai.set(i); |
262 |
< |
assertEquals((double)i, ai.doubleValue()); |
260 |
> |
assertEquals(0.0d, ai.doubleValue()); |
261 |
> |
for (int x : VALUES) { |
262 |
> |
ai.set(x); |
263 |
> |
assertEquals((double)x, ai.doubleValue()); |
264 |
|
} |
265 |
|
} |
266 |
|
|
267 |
+ |
// jdk9 |
268 |
+ |
|
269 |
+ |
/** |
270 |
+ |
* getPlain returns the last value set |
271 |
+ |
*/ |
272 |
+ |
public void testGetPlainSet() { |
273 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
274 |
+ |
assertEquals(1, ai.getPlain()); |
275 |
+ |
ai.set(2); |
276 |
+ |
assertEquals(2, ai.getPlain()); |
277 |
+ |
ai.set(-3); |
278 |
+ |
assertEquals(-3, ai.getPlain()); |
279 |
+ |
} |
280 |
+ |
|
281 |
+ |
/** |
282 |
+ |
* getOpaque returns the last value set |
283 |
+ |
*/ |
284 |
+ |
public void testGetOpaqueSet() { |
285 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
286 |
+ |
assertEquals(1, ai.getOpaque()); |
287 |
+ |
ai.set(2); |
288 |
+ |
assertEquals(2, ai.getOpaque()); |
289 |
+ |
ai.set(-3); |
290 |
+ |
assertEquals(-3, ai.getOpaque()); |
291 |
+ |
} |
292 |
+ |
|
293 |
+ |
/** |
294 |
+ |
* getAcquire returns the last value set |
295 |
+ |
*/ |
296 |
+ |
public void testGetAcquireSet() { |
297 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
298 |
+ |
assertEquals(1, ai.getAcquire()); |
299 |
+ |
ai.set(2); |
300 |
+ |
assertEquals(2, ai.getAcquire()); |
301 |
+ |
ai.set(-3); |
302 |
+ |
assertEquals(-3, ai.getAcquire()); |
303 |
+ |
} |
304 |
+ |
|
305 |
+ |
/** |
306 |
+ |
* get returns the last value setPlain |
307 |
+ |
*/ |
308 |
+ |
public void testGetSetPlain() { |
309 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
310 |
+ |
assertEquals(1, ai.get()); |
311 |
+ |
ai.setPlain(2); |
312 |
+ |
assertEquals(2, ai.get()); |
313 |
+ |
ai.setPlain(-3); |
314 |
+ |
assertEquals(-3, ai.get()); |
315 |
+ |
} |
316 |
+ |
|
317 |
+ |
/** |
318 |
+ |
* get returns the last value setOpaque |
319 |
+ |
*/ |
320 |
+ |
public void testGetSetOpaque() { |
321 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
322 |
+ |
assertEquals(1, ai.get()); |
323 |
+ |
ai.setOpaque(2); |
324 |
+ |
assertEquals(2, ai.get()); |
325 |
+ |
ai.setOpaque(-3); |
326 |
+ |
assertEquals(-3, ai.get()); |
327 |
+ |
} |
328 |
+ |
|
329 |
+ |
/** |
330 |
+ |
* get returns the last value setRelease |
331 |
+ |
*/ |
332 |
+ |
public void testGetSetRelease() { |
333 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
334 |
+ |
assertEquals(1, ai.get()); |
335 |
+ |
ai.setRelease(2); |
336 |
+ |
assertEquals(2, ai.get()); |
337 |
+ |
ai.setRelease(-3); |
338 |
+ |
assertEquals(-3, ai.get()); |
339 |
+ |
} |
340 |
+ |
|
341 |
+ |
/** |
342 |
+ |
* compareAndExchange succeeds in changing value if equal to |
343 |
+ |
* expected else fails |
344 |
+ |
*/ |
345 |
+ |
public void testCompareAndExchange() { |
346 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
347 |
+ |
assertEquals(1, ai.compareAndExchange(1, 2)); |
348 |
+ |
assertEquals(2, ai.compareAndExchange(2, -4)); |
349 |
+ |
assertEquals(-4, ai.get()); |
350 |
+ |
assertEquals(-4, ai.compareAndExchange(-5, 7)); |
351 |
+ |
assertEquals(-4, ai.get()); |
352 |
+ |
assertEquals(-4, ai.compareAndExchange(-4, 7)); |
353 |
+ |
assertEquals(7, ai.get()); |
354 |
+ |
} |
355 |
+ |
|
356 |
+ |
/** |
357 |
+ |
* compareAndExchangeAcquire succeeds in changing value if equal to |
358 |
+ |
* expected else fails |
359 |
+ |
*/ |
360 |
+ |
public void testCompareAndExchangeAcquire() { |
361 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
362 |
+ |
assertEquals(1, ai.compareAndExchangeAcquire(1, 2)); |
363 |
+ |
assertEquals(2, ai.compareAndExchangeAcquire(2, -4)); |
364 |
+ |
assertEquals(-4, ai.get()); |
365 |
+ |
assertEquals(-4, ai.compareAndExchangeAcquire(-5, 7)); |
366 |
+ |
assertEquals(-4, ai.get()); |
367 |
+ |
assertEquals(-4, ai.compareAndExchangeAcquire(-4, 7)); |
368 |
+ |
assertEquals(7, ai.get()); |
369 |
+ |
} |
370 |
+ |
|
371 |
+ |
/** |
372 |
+ |
* compareAndExchangeRelease succeeds in changing value if equal to |
373 |
+ |
* expected else fails |
374 |
+ |
*/ |
375 |
+ |
public void testCompareAndExchangeRelease() { |
376 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
377 |
+ |
assertEquals(1, ai.compareAndExchangeRelease(1, 2)); |
378 |
+ |
assertEquals(2, ai.compareAndExchangeRelease(2, -4)); |
379 |
+ |
assertEquals(-4, ai.get()); |
380 |
+ |
assertEquals(-4, ai.compareAndExchangeRelease(-5, 7)); |
381 |
+ |
assertEquals(-4, ai.get()); |
382 |
+ |
assertEquals(-4, ai.compareAndExchangeRelease(-4, 7)); |
383 |
+ |
assertEquals(7, ai.get()); |
384 |
+ |
} |
385 |
|
|
386 |
+ |
/** |
387 |
+ |
* repeated weakCompareAndSetVolatile succeeds in changing value when equal |
388 |
+ |
* to expected |
389 |
+ |
*/ |
390 |
+ |
public void testWeakCompareAndSetVolatile() { |
391 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
392 |
+ |
do {} while (!ai.weakCompareAndSetVolatile(1, 2)); |
393 |
+ |
do {} while (!ai.weakCompareAndSetVolatile(2, -4)); |
394 |
+ |
assertEquals(-4, ai.get()); |
395 |
+ |
do {} while (!ai.weakCompareAndSetVolatile(-4, 7)); |
396 |
+ |
assertEquals(7, ai.get()); |
397 |
+ |
} |
398 |
|
|
399 |
+ |
/** |
400 |
+ |
* repeated weakCompareAndSetAcquire succeeds in changing value when equal |
401 |
+ |
* to expected |
402 |
+ |
*/ |
403 |
+ |
public void testWeakCompareAndSetAcquire() { |
404 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
405 |
+ |
do {} while (!ai.weakCompareAndSetAcquire(1, 2)); |
406 |
+ |
do {} while (!ai.weakCompareAndSetAcquire(2, -4)); |
407 |
+ |
assertEquals(-4, ai.get()); |
408 |
+ |
do {} while (!ai.weakCompareAndSetAcquire(-4, 7)); |
409 |
+ |
assertEquals(7, ai.get()); |
410 |
+ |
} |
411 |
+ |
|
412 |
+ |
/** |
413 |
+ |
* repeated weakCompareAndSetRelease succeeds in changing value when equal |
414 |
+ |
* to expected |
415 |
+ |
*/ |
416 |
+ |
public void testWeakCompareAndSetRelease() { |
417 |
+ |
AtomicInteger ai = new AtomicInteger(1); |
418 |
+ |
do {} while (!ai.weakCompareAndSetRelease(1, 2)); |
419 |
+ |
do {} while (!ai.weakCompareAndSetRelease(2, -4)); |
420 |
+ |
assertEquals(-4, ai.get()); |
421 |
+ |
do {} while (!ai.weakCompareAndSetRelease(-4, 7)); |
422 |
+ |
assertEquals(7, ai.get()); |
423 |
+ |
} |
424 |
+ |
|
425 |
+ |
|
426 |
|
} |