| /* |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| package jsr166; |
| |
| import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase { |
| volatile Integer x = null; |
| protected volatile Integer protectedField; |
| private volatile Integer privateField; |
| Object z; |
| Integer w; |
| volatile int i; |
| |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // public static void main(String[] args) { |
| // main(suite(), args); |
| // } |
| // public static Test suite() { |
| // return new TestSuite(AtomicReferenceFieldUpdaterTest.class); |
| // } |
| |
| // for testing subclass access |
| static class AtomicReferenceFieldUpdaterTestSubclass extends AtomicReferenceFieldUpdaterTest { |
| public void checkPrivateAccess() { |
| try { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a = |
| AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, "privateField"); |
| shouldThrow(); |
| } catch (RuntimeException success) { |
| assertNotNull(success.getCause()); |
| } |
| } |
| |
| public void checkCompareAndSetProtectedSub() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a = |
| AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, "protectedField"); |
| this.protectedField = one; |
| assertTrue(a.compareAndSet(this, one, two)); |
| assertTrue(a.compareAndSet(this, two, m4)); |
| assertSame(m4, a.get(this)); |
| assertFalse(a.compareAndSet(this, m5, seven)); |
| assertFalse(seven == a.get(this)); |
| assertTrue(a.compareAndSet(this, m4, seven)); |
| assertSame(seven, a.get(this)); |
| } |
| } |
| |
| static class UnrelatedClass { |
| public void checkPackageAccess(AtomicReferenceFieldUpdaterTest obj) { |
| obj.x = one; |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a = |
| AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, "x"); |
| assertSame(one, a.get(obj)); |
| assertTrue(a.compareAndSet(obj, one, two)); |
| assertSame(two, a.get(obj)); |
| } |
| |
| public void checkPrivateAccess(AtomicReferenceFieldUpdaterTest obj) { |
| try { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a = |
| AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, "privateField"); |
| throw new AssertionError("should throw"); |
| } catch (RuntimeException success) { |
| assertNotNull(success.getCause()); |
| } |
| } |
| } |
| |
| static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
| return AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName); |
| } |
| |
| /** |
| * Construction with non-existent field throws RuntimeException |
| */ |
| public void testConstructor() { |
| try { |
| updaterFor("y"); |
| shouldThrow(); |
| } catch (RuntimeException success) { |
| assertNotNull(success.getCause()); |
| } |
| } |
| |
| /** |
| * construction with field not of given type throws ClassCastException |
| */ |
| public void testConstructor2() { |
| try { |
| updaterFor("z"); |
| shouldThrow(); |
| } catch (ClassCastException success) {} |
| } |
| |
| /** |
| * Constructor with non-volatile field throws IllegalArgumentException |
| */ |
| public void testConstructor3() { |
| try { |
| updaterFor("w"); |
| shouldThrow(); |
| } catch (IllegalArgumentException success) {} |
| } |
| |
| /** |
| * Constructor with non-reference field throws ClassCastException |
| */ |
| public void testConstructor4() { |
| try { |
| updaterFor("i"); |
| shouldThrow(); |
| } catch (ClassCastException success) {} |
| } |
| |
| /** |
| * construction using private field from subclass throws RuntimeException |
| */ |
| public void testPrivateFieldInSubclass() { |
| AtomicReferenceFieldUpdaterTestSubclass s = |
| new AtomicReferenceFieldUpdaterTestSubclass(); |
| s.checkPrivateAccess(); |
| } |
| |
| /** |
| * construction from unrelated class; package access is allowed, |
| * private access is not |
| */ |
| public void testUnrelatedClassAccess() { |
| new UnrelatedClass().checkPackageAccess(this); |
| new UnrelatedClass().checkPrivateAccess(this); |
| } |
| |
| /** |
| * get returns the last value set or assigned |
| */ |
| public void testGetSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.get(this)); |
| a.set(this, two); |
| assertSame(two, a.get(this)); |
| a.set(this, m3); |
| assertSame(m3, a.get(this)); |
| } |
| |
| /** |
| * get returns the last value lazySet by same thread |
| */ |
| public void testGetLazySet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.get(this)); |
| a.lazySet(this, two); |
| assertSame(two, a.get(this)); |
| a.lazySet(this, m3); |
| assertSame(m3, a.get(this)); |
| } |
| |
| /** |
| * compareAndSet succeeds in changing value if equal to expected else fails |
| */ |
| public void testCompareAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertTrue(a.compareAndSet(this, one, two)); |
| assertTrue(a.compareAndSet(this, two, m4)); |
| assertSame(m4, a.get(this)); |
| assertFalse(a.compareAndSet(this, m5, seven)); |
| assertFalse(seven == a.get(this)); |
| assertTrue(a.compareAndSet(this, m4, seven)); |
| assertSame(seven, a.get(this)); |
| } |
| |
| /** |
| * compareAndSet in one thread enables another waiting for value |
| * to succeed |
| */ |
| public void testCompareAndSetInMultipleThreads() throws Exception { |
| x = one; |
| final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| |
| Thread t = new Thread(new CheckedRunnable() { |
| public void realRun() { |
| while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) |
| Thread.yield(); |
| }}); |
| |
| t.start(); |
| assertTrue(a.compareAndSet(this, one, two)); |
| t.join(LONG_DELAY_MS); |
| assertFalse(t.isAlive()); |
| assertSame(three, a.get(this)); |
| } |
| |
| /** |
| * repeated weakCompareAndSet succeeds in changing value when equal |
| * to expected |
| */ |
| public void testWeakCompareAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| do {} while (!a.weakCompareAndSet(this, one, two)); |
| do {} while (!a.weakCompareAndSet(this, two, m4)); |
| assertSame(m4, a.get(this)); |
| do {} while (!a.weakCompareAndSet(this, m4, seven)); |
| assertSame(seven, a.get(this)); |
| } |
| |
| /** |
| * getAndSet returns previous value and sets to given value |
| */ |
| public void testGetAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.getAndSet(this, zero)); |
| assertSame(zero, a.getAndSet(this, m10)); |
| assertSame(m10, a.getAndSet(this, 1)); |
| } |
| |
| } |