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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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jsr166 |
1.10 |
* 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 java.util.concurrent.atomic.*; |
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import junit.framework.*; |
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import java.util.*; |
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dl |
1.2 |
public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase { |
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dl |
1.1 |
volatile int x = 0; |
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dl |
1.4 |
int w; |
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dl |
1.2 |
long z; |
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jsr166 |
1.12 |
public static void main(String[] args) { |
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dl |
1.1 |
junit.textui.TestRunner.run(suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(AtomicIntegerFieldUpdaterTest.class); |
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} |
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dl |
1.3 |
/** |
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dl |
1.7 |
* Construction with non-existent field throws RuntimeException |
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dl |
1.3 |
*/ |
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public void testConstructor() { |
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jsr166 |
1.11 |
try { |
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jsr166 |
1.10 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> |
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dl |
1.1 |
a = AtomicIntegerFieldUpdater.newUpdater |
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dl |
1.5 |
(AtomicIntegerFieldUpdaterTest.class, "y"); |
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1.3 |
shouldThrow(); |
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1.2 |
} |
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catch (RuntimeException rt) {} |
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} |
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dl |
1.3 |
/** |
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dl |
1.4 |
* construction with field not of given type throws RuntimeException |
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dl |
1.3 |
*/ |
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public void testConstructor2() { |
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jsr166 |
1.11 |
try { |
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jsr166 |
1.10 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> |
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dl |
1.2 |
a = AtomicIntegerFieldUpdater.newUpdater |
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dl |
1.5 |
(AtomicIntegerFieldUpdaterTest.class, "z"); |
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dl |
1.3 |
shouldThrow(); |
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dl |
1.1 |
} |
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catch (RuntimeException rt) {} |
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} |
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dl |
1.3 |
/** |
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dl |
1.4 |
* construction with non-volatile field throws RuntimeException |
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*/ |
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public void testConstructor3() { |
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jsr166 |
1.11 |
try { |
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jsr166 |
1.10 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> |
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dl |
1.4 |
a = AtomicIntegerFieldUpdater.newUpdater |
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dl |
1.5 |
(AtomicIntegerFieldUpdaterTest.class, "w"); |
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dl |
1.4 |
shouldThrow(); |
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} |
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catch (RuntimeException rt) {} |
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} |
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/** |
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* get returns the last value set or assigned |
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dl |
1.3 |
*/ |
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public void testGetSet() { |
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dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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try { |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
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return; |
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} |
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dl |
1.1 |
x = 1; |
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assertEquals(1,a.get(this)); |
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a.set(this,2); |
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assertEquals(2,a.get(this)); |
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a.set(this,-3); |
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assertEquals(-3,a.get(this)); |
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jsr166 |
1.10 |
|
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dl |
1.1 |
} |
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dl |
1.9 |
|
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/** |
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* get returns the last value lazySet by same thread |
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*/ |
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public void testGetLazySet() { |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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try { |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.get(this)); |
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a.lazySet(this,2); |
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assertEquals(2,a.get(this)); |
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a.lazySet(this,-3); |
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assertEquals(-3,a.get(this)); |
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jsr166 |
1.10 |
|
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dl |
1.9 |
} |
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dl |
1.3 |
/** |
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dl |
1.4 |
* compareAndSet succeeds in changing value if equal to expected else fails |
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dl |
1.3 |
*/ |
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public void testCompareAndSet() { |
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dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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try { |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
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return; |
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} |
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dl |
1.1 |
x = 1; |
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assertTrue(a.compareAndSet(this,1,2)); |
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assertTrue(a.compareAndSet(this,2,-4)); |
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assertEquals(-4,a.get(this)); |
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assertFalse(a.compareAndSet(this,-5,7)); |
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assertFalse((7 == a.get(this))); |
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assertTrue(a.compareAndSet(this,-4,7)); |
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assertEquals(7,a.get(this)); |
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} |
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dl |
1.4 |
|
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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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jsr166 |
1.13 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
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dl |
1.4 |
x = 1; |
128 |
dl |
1.8 |
final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a; |
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try { |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
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return; |
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} |
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dl |
1.4 |
|
135 |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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jsr166 |
1.11 |
while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield(); |
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dl |
1.4 |
}}); |
139 |
jsr166 |
1.13 |
|
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t.start(); |
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assertTrue(a.compareAndSet(this, 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(this), 3); |
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dl |
1.4 |
} |
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147 |
dl |
1.3 |
/** |
148 |
dl |
1.4 |
* repeated weakCompareAndSet succeeds in changing value when equal |
149 |
jsr166 |
1.10 |
* to expected |
150 |
dl |
1.3 |
*/ |
151 |
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public void testWeakCompareAndSet() { |
152 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
153 |
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try { |
154 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
156 |
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return; |
157 |
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} |
158 |
dl |
1.1 |
x = 1; |
159 |
jsr166 |
1.11 |
while (!a.weakCompareAndSet(this,1,2)); |
160 |
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while (!a.weakCompareAndSet(this,2,-4)); |
161 |
dl |
1.1 |
assertEquals(-4,a.get(this)); |
162 |
jsr166 |
1.11 |
while (!a.weakCompareAndSet(this,-4,7)); |
163 |
dl |
1.1 |
assertEquals(7,a.get(this)); |
164 |
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} |
165 |
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166 |
dl |
1.3 |
/** |
167 |
dl |
1.4 |
* getAndSet returns previous value and sets to given value |
168 |
dl |
1.3 |
*/ |
169 |
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public void testGetAndSet() { |
170 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
171 |
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try { |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
174 |
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return; |
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} |
176 |
dl |
1.1 |
x = 1; |
177 |
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assertEquals(1,a.getAndSet(this, 0)); |
178 |
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assertEquals(0,a.getAndSet(this,-10)); |
179 |
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assertEquals(-10,a.getAndSet(this,1)); |
180 |
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} |
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182 |
dl |
1.3 |
/** |
183 |
dl |
1.4 |
* getAndAdd returns previous value and adds given value |
184 |
dl |
1.3 |
*/ |
185 |
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public void testGetAndAdd() { |
186 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
187 |
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try { |
188 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException ok) { |
190 |
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return; |
191 |
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} |
192 |
dl |
1.1 |
x = 1; |
193 |
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assertEquals(1,a.getAndAdd(this,2)); |
194 |
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assertEquals(3,a.get(this)); |
195 |
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assertEquals(3,a.getAndAdd(this,-4)); |
196 |
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assertEquals(-1,a.get(this)); |
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} |
198 |
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199 |
dl |
1.3 |
/** |
200 |
dl |
1.4 |
* getAndDecrement returns previous value and decrements |
201 |
dl |
1.3 |
*/ |
202 |
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public void testGetAndDecrement() { |
203 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
204 |
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try { |
205 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
206 |
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} catch (RuntimeException ok) { |
207 |
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return; |
208 |
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} |
209 |
dl |
1.1 |
x = 1; |
210 |
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assertEquals(1,a.getAndDecrement(this)); |
211 |
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assertEquals(0,a.getAndDecrement(this)); |
212 |
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assertEquals(-1,a.getAndDecrement(this)); |
213 |
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} |
214 |
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215 |
dl |
1.3 |
/** |
216 |
dl |
1.4 |
* getAndIncrement returns previous value and increments |
217 |
dl |
1.3 |
*/ |
218 |
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public void testGetAndIncrement() { |
219 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
220 |
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try { |
221 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
222 |
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} catch (RuntimeException ok) { |
223 |
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return; |
224 |
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} |
225 |
dl |
1.1 |
x = 1; |
226 |
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assertEquals(1,a.getAndIncrement(this)); |
227 |
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assertEquals(2,a.get(this)); |
228 |
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a.set(this,-2); |
229 |
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assertEquals(-2,a.getAndIncrement(this)); |
230 |
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assertEquals(-1,a.getAndIncrement(this)); |
231 |
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assertEquals(0,a.getAndIncrement(this)); |
232 |
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assertEquals(1,a.get(this)); |
233 |
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} |
234 |
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235 |
dl |
1.3 |
/** |
236 |
dl |
1.4 |
* addAndGet adds given value to current, and returns current value |
237 |
dl |
1.3 |
*/ |
238 |
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public void testAddAndGet() { |
239 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
240 |
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try { |
241 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
242 |
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} catch (RuntimeException ok) { |
243 |
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return; |
244 |
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} |
245 |
dl |
1.1 |
x = 1; |
246 |
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assertEquals(3,a.addAndGet(this,2)); |
247 |
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assertEquals(3,a.get(this)); |
248 |
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assertEquals(-1,a.addAndGet(this,-4)); |
249 |
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assertEquals(-1,a.get(this)); |
250 |
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} |
251 |
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252 |
dl |
1.3 |
/** |
253 |
dl |
1.4 |
* decrementAndGet decrements and returns current value |
254 |
dl |
1.3 |
*/ |
255 |
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public void testDecrementAndGet() { |
256 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
257 |
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try { |
258 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
259 |
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} catch (RuntimeException ok) { |
260 |
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return; |
261 |
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} |
262 |
dl |
1.1 |
x = 1; |
263 |
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assertEquals(0,a.decrementAndGet(this)); |
264 |
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assertEquals(-1,a.decrementAndGet(this)); |
265 |
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assertEquals(-2,a.decrementAndGet(this)); |
266 |
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assertEquals(-2,a.get(this)); |
267 |
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} |
268 |
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|
269 |
dl |
1.3 |
/** |
270 |
dl |
1.4 |
* incrementAndGet increments and returns current value |
271 |
dl |
1.3 |
*/ |
272 |
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public void testIncrementAndGet() { |
273 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
274 |
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try { |
275 |
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a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x"); |
276 |
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} catch (RuntimeException ok) { |
277 |
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return; |
278 |
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} |
279 |
dl |
1.1 |
x = 1; |
280 |
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assertEquals(2,a.incrementAndGet(this)); |
281 |
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assertEquals(2,a.get(this)); |
282 |
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a.set(this,-2); |
283 |
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assertEquals(-1,a.incrementAndGet(this)); |
284 |
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assertEquals(0,a.incrementAndGet(this)); |
285 |
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assertEquals(1,a.incrementAndGet(this)); |
286 |
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assertEquals(1,a.get(this)); |
287 |
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} |
288 |
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289 |
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} |