AtomicLongFieldUpdaterTestpublic class AtomicLongFieldUpdaterTest extends JSR166TestCase
| Fields Summary |
|---|
| volatile long | x | | int | z | | long | w |
| Methods Summary |
|---|
| public static void | main(java.lang.String[] args)
junit.textui.TestRunner.run(suite());
| | public static junit.framework.Test | suite()
return new TestSuite(AtomicLongFieldUpdaterTest.class);
| | public void | testAddAndGet()addAndGet adds given value to current, and returns current value
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(3,a.addAndGet(this,2));
assertEquals(3,a.get(this));
assertEquals(-1,a.addAndGet(this,-4));
assertEquals(-1,a.get(this));
| | public void | testCompareAndSet()compareAndSet succeeds in changing value if equal to expected else fails
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertTrue(a.compareAndSet(this,1,2));
assertTrue(a.compareAndSet(this,2,-4));
assertEquals(-4,a.get(this));
assertFalse(a.compareAndSet(this,-5,7));
assertFalse((7 == a.get(this)));
assertTrue(a.compareAndSet(this,-4,7));
assertEquals(7,a.get(this));
| | public void | testCompareAndSetInMultipleThreads()compareAndSet in one thread enables another waiting for value
to succeed
x = 1;
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
Thread t = new Thread(new Runnable() {
public void run() {
while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield();
}});
try {
t.start();
assertTrue(a.compareAndSet(this, 1, 2));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertEquals(a.get(this), 3);
}
catch(Exception e) {
unexpectedException();
}
| | public void | testConstructor()Construction with non-existent field throws RuntimeException
try{
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
a = AtomicLongFieldUpdater.newUpdater
(AtomicLongFieldUpdaterTest.class, "y");
shouldThrow();
}
catch (RuntimeException rt) {}
| | public void | testConstructor2()construction with field not of given type throws RuntimeException
try{
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
a = AtomicLongFieldUpdater.newUpdater
(AtomicLongFieldUpdaterTest.class, "z");
shouldThrow();
}
catch (RuntimeException rt) {}
| | public void | testConstructor3()construction with non-volatile field throws RuntimeException
try{
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
a = AtomicLongFieldUpdater.newUpdater
(AtomicLongFieldUpdaterTest.class, "w");
shouldThrow();
}
catch (RuntimeException rt) {}
| | public void | testDecrementAndGet()decrementAndGet decrements and returns current value
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(0,a.decrementAndGet(this));
assertEquals(-1,a.decrementAndGet(this));
assertEquals(-2,a.decrementAndGet(this));
assertEquals(-2,a.get(this));
| | public void | testGetAndAdd()getAndAdd returns previous value and adds given value
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(1,a.getAndAdd(this,2));
assertEquals(3,a.get(this));
assertEquals(3,a.getAndAdd(this,-4));
assertEquals(-1,a.get(this));
| | public void | testGetAndDecrement()getAndDecrement returns previous value and decrements
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(1,a.getAndDecrement(this));
assertEquals(0,a.getAndDecrement(this));
assertEquals(-1,a.getAndDecrement(this));
| | public void | testGetAndIncrement()getAndIncrement returns previous value and increments
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(1,a.getAndIncrement(this));
assertEquals(2,a.get(this));
a.set(this,-2);
assertEquals(-2,a.getAndIncrement(this));
assertEquals(-1,a.getAndIncrement(this));
assertEquals(0,a.getAndIncrement(this));
assertEquals(1,a.get(this));
| | public void | testGetAndSet()getAndSet returns previous value and sets to given value
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(1,a.getAndSet(this, 0));
assertEquals(0,a.getAndSet(this,-10));
assertEquals(-10,a.getAndSet(this,1));
| | public void | testGetSet()get returns the last value set or assigned
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(1,a.get(this));
a.set(this,2);
assertEquals(2,a.get(this));
a.set(this,-3);
assertEquals(-3,a.get(this));
| | public void | testIncrementAndGet()incrementAndGet increments and returns current value
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
assertEquals(2,a.incrementAndGet(this));
assertEquals(2,a.get(this));
a.set(this,-2);
assertEquals(-1,a.incrementAndGet(this));
assertEquals(0,a.incrementAndGet(this));
assertEquals(1,a.incrementAndGet(this));
assertEquals(1,a.get(this));
| | public void | testWeakCompareAndSet()repeated weakCompareAndSet succeeds in changing value when equal
to expected
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
try {
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
} catch (RuntimeException ok) {
return;
}
x = 1;
while(!a.weakCompareAndSet(this,1,2));
while(!a.weakCompareAndSet(this,2,-4));
assertEquals(-4,a.get(this));
while(!a.weakCompareAndSet(this,-4,7));
assertEquals(7,a.get(this));
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