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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; |
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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 AtomicReferenceFieldUpdaterTest extends JSR166TestCase { |
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volatile Integer x = null; |
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protected volatile Integer protectedField; |
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private volatile Integer privateField; |
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Object z; |
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Integer w; |
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volatile int i; |
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|
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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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(AtomicReferenceFieldUpdaterTest.class); |
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} |
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|
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
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static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
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return AtomicReferenceFieldUpdater.newUpdater |
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(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName); |
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} |
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updaterFor("y"); |
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shouldThrow(); |
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} catch (RuntimeException success) { |
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assertTrue(success.getCause() != null); |
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assertNotNull(success.getCause()); |
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} |
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} |
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|
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} |
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/** |
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* construction using private field from subclass throws RuntimeException |
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*/ |
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public void testPrivateFieldInSubclass() { |
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new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass() |
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.checkPrivateAccess(); |
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} |
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|
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/** |
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* construction from unrelated class; package access is allowed, |
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* private access is not |
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*/ |
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public void testUnrelatedClassAccess() { |
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new NonNestmates().checkPackageAccess(this); |
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new NonNestmates().checkPrivateAccess(this); |
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} |
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|
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/** |
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* get returns the last value set or assigned |
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*/ |
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public void testGetSet() { |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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x = one; |
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assertSame(one, a.get(this)); |
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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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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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x = one; |
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assertSame(one, a.get(this)); |
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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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* compareAndSet succeeds in changing value if same as expected else fails |
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*/ |
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public void testCompareAndSet() { |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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x = one; |
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assertTrue(a.compareAndSet(this, one, two)); |
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assertTrue(a.compareAndSet(this, two, m4)); |
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assertSame(m4, a.get(this)); |
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assertFalse(a.compareAndSet(this, m5, seven)); |
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assertFalse(seven == a.get(this)); |
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assertNotSame(seven, a.get(this)); |
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assertTrue(a.compareAndSet(this, m4, seven)); |
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assertSame(seven, a.get(this)); |
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} |
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/** |
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* compareAndSet succeeds in changing protected field value if |
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* same as expected else fails |
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*/ |
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public void testCompareAndSetProtectedInSubclass() { |
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new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass() |
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.checkCompareAndSetProtectedSub(); |
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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() throws Exception { |
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x = one; |
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final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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|
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Thread t = new Thread(new CheckedRunnable() { |
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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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* repeated weakCompareAndSet succeeds in changing value when same as expected |
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*/ |
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public void testWeakCompareAndSet() { |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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x = one; |
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while (!a.weakCompareAndSet(this, one, two)); |
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while (!a.weakCompareAndSet(this, two, m4)); |
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do {} while (!a.weakCompareAndSet(this, one, two)); |
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do {} while (!a.weakCompareAndSet(this, two, m4)); |
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assertSame(m4, a.get(this)); |
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while (!a.weakCompareAndSet(this, m4, seven)); |
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do {} while (!a.weakCompareAndSet(this, m4, seven)); |
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assertSame(seven, a.get(this)); |
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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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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
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a = updaterFor("x"); |
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x = one; |
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assertSame(one, a.getAndSet(this, zero)); |