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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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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/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 java.util.concurrent.atomic.*; |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
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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 AtomicIntegerFieldUpdaterTest extends JSR166TestCase { |
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volatile int x = 0; |
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long z; |
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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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protected volatile int protectedField; |
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private volatile int privateField; |
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int w; |
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float z; |
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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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– |
|
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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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|
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) { |
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return AtomicIntegerFieldUpdater.newUpdater |
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(AtomicIntegerFieldUpdaterTest.class, fieldName); |
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} |
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|
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/** |
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* |
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* Construction with non-existent field throws RuntimeException |
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*/ |
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public void testConstructor() { |
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try{ |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> |
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a = AtomicIntegerFieldUpdater.newUpdater |
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(getClass(), "y"); |
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try { |
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updaterFor("y"); |
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shouldThrow(); |
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} catch (RuntimeException success) { |
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assertNotNull(success.getCause()); |
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} |
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catch (RuntimeException rt) {} |
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} |
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|
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/** |
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* |
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* construction with field not of given type throws IllegalArgumentException |
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*/ |
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public void testConstructor2() { |
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try{ |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> |
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a = AtomicIntegerFieldUpdater.newUpdater |
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(getClass(), "z"); |
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try { |
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updaterFor("z"); |
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shouldThrow(); |
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} |
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catch (RuntimeException rt) {} |
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} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* construction with non-volatile field throws IllegalArgumentException |
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*/ |
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public void testConstructor3() { |
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try { |
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updaterFor("w"); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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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.AtomicIntegerFieldUpdaterTestSubclass() |
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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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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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a = updaterFor("x"); |
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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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} |
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|
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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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a = updaterFor("x"); |
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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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|
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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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} |
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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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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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a = updaterFor("x"); |
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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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assertEquals(-4, 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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|
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/** |
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* compareAndSet succeeds in changing protected field value if |
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* equal to expected else fails |
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*/ |
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public void testCompareAndSetProtected() { |
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AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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a = updaterFor("protectedField"); |
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protectedField = 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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assertEquals(-4, 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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> |
|
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> |
/** |
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* compareAndSet succeeds in changing protected field value if |
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* equal to expected else fails |
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> |
*/ |
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> |
public void testCompareAndSetProtectedInSubclass() { |
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new NonNestmates.AtomicIntegerFieldUpdaterTestSubclass() |
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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 = 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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> |
final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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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> |
public void realRun() { |
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> |
while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 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(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(3, a.get(this)); |
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} |
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|
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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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*/ |
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public void testWeakCompareAndSet() { |
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< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
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> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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> |
a = updaterFor("x"); |
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x = 1; |
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< |
while(!a.weakCompareAndSet(this,1,2)); |
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< |
while(!a.weakCompareAndSet(this,2,-4)); |
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assertEquals(-4,a.get(this)); |
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while(!a.weakCompareAndSet(this,-4,7)); |
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assertEquals(7,a.get(this)); |
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do {} while (!a.weakCompareAndSet(this, 1, 2)); |
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do {} while (!a.weakCompareAndSet(this, 2, -4)); |
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assertEquals(-4, a.get(this)); |
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do {} while (!a.weakCompareAndSet(this, -4, 7)); |
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assertEquals(7, a.get(this)); |
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} |
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|
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/** |
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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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< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
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> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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> |
a = updaterFor("x"); |
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x = 1; |
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< |
assertEquals(1,a.getAndSet(this, 0)); |
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< |
assertEquals(0,a.getAndSet(this,-10)); |
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< |
assertEquals(-10,a.getAndSet(this,1)); |
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> |
assertEquals(1, a.getAndSet(this, 0)); |
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> |
assertEquals(0, a.getAndSet(this, -10)); |
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> |
assertEquals(-10, a.getAndSet(this, 1)); |
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} |
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|
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/** |
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< |
* |
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> |
* getAndAdd returns previous value and adds given value |
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*/ |
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public void testGetAndAdd() { |
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< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
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> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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> |
a = updaterFor("x"); |
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x = 1; |
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< |
assertEquals(1,a.getAndAdd(this,2)); |
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< |
assertEquals(3,a.get(this)); |
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< |
assertEquals(3,a.getAndAdd(this,-4)); |
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< |
assertEquals(-1,a.get(this)); |
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> |
assertEquals(1, a.getAndAdd(this, 2)); |
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> |
assertEquals(3, a.get(this)); |
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> |
assertEquals(3, a.getAndAdd(this, -4)); |
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> |
assertEquals(-1, a.get(this)); |
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} |
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|
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/** |
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< |
* |
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> |
* getAndDecrement returns previous value and decrements |
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*/ |
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public void testGetAndDecrement() { |
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< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
| 217 |
> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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> |
a = updaterFor("x"); |
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|
x = 1; |
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< |
assertEquals(1,a.getAndDecrement(this)); |
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< |
assertEquals(0,a.getAndDecrement(this)); |
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< |
assertEquals(-1,a.getAndDecrement(this)); |
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> |
assertEquals(1, a.getAndDecrement(this)); |
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> |
assertEquals(0, a.getAndDecrement(this)); |
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> |
assertEquals(-1, a.getAndDecrement(this)); |
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} |
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|
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/** |
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< |
* |
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> |
* getAndIncrement returns previous value and increments |
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*/ |
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public void testGetAndIncrement() { |
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< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
| 229 |
> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
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> |
a = updaterFor("x"); |
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x = 1; |
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< |
assertEquals(1,a.getAndIncrement(this)); |
| 233 |
< |
assertEquals(2,a.get(this)); |
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< |
a.set(this,-2); |
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< |
assertEquals(-2,a.getAndIncrement(this)); |
| 236 |
< |
assertEquals(-1,a.getAndIncrement(this)); |
| 237 |
< |
assertEquals(0,a.getAndIncrement(this)); |
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< |
assertEquals(1,a.get(this)); |
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> |
assertEquals(1, a.getAndIncrement(this)); |
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> |
assertEquals(2, a.get(this)); |
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> |
a.set(this, -2); |
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> |
assertEquals(-2, a.getAndIncrement(this)); |
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> |
assertEquals(-1, a.getAndIncrement(this)); |
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> |
assertEquals(0, a.getAndIncrement(this)); |
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> |
assertEquals(1, a.get(this)); |
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} |
| 240 |
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|
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/** |
| 242 |
< |
* |
| 242 |
> |
* addAndGet adds given value to current, and returns current value |
| 243 |
|
*/ |
| 244 |
|
public void testAddAndGet() { |
| 245 |
< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
| 245 |
> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 246 |
> |
a = updaterFor("x"); |
| 247 |
|
x = 1; |
| 248 |
< |
assertEquals(3,a.addAndGet(this,2)); |
| 249 |
< |
assertEquals(3,a.get(this)); |
| 250 |
< |
assertEquals(-1,a.addAndGet(this,-4)); |
| 251 |
< |
assertEquals(-1,a.get(this)); |
| 248 |
> |
assertEquals(3, a.addAndGet(this, 2)); |
| 249 |
> |
assertEquals(3, a.get(this)); |
| 250 |
> |
assertEquals(-1, a.addAndGet(this, -4)); |
| 251 |
> |
assertEquals(-1, a.get(this)); |
| 252 |
|
} |
| 253 |
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|
| 254 |
|
/** |
| 255 |
< |
* |
| 255 |
> |
* decrementAndGet decrements and returns current value |
| 256 |
|
*/ |
| 257 |
|
public void testDecrementAndGet() { |
| 258 |
< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
| 258 |
> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 259 |
> |
a = updaterFor("x"); |
| 260 |
|
x = 1; |
| 261 |
< |
assertEquals(0,a.decrementAndGet(this)); |
| 262 |
< |
assertEquals(-1,a.decrementAndGet(this)); |
| 263 |
< |
assertEquals(-2,a.decrementAndGet(this)); |
| 264 |
< |
assertEquals(-2,a.get(this)); |
| 261 |
> |
assertEquals(0, a.decrementAndGet(this)); |
| 262 |
> |
assertEquals(-1, a.decrementAndGet(this)); |
| 263 |
> |
assertEquals(-2, a.decrementAndGet(this)); |
| 264 |
> |
assertEquals(-2, a.get(this)); |
| 265 |
|
} |
| 266 |
|
|
| 267 |
|
/** |
| 268 |
< |
* |
| 268 |
> |
* incrementAndGet increments and returns current value |
| 269 |
|
*/ |
| 270 |
|
public void testIncrementAndGet() { |
| 271 |
< |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x"); |
| 271 |
> |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 272 |
> |
a = updaterFor("x"); |
| 273 |
|
x = 1; |
| 274 |
< |
assertEquals(2,a.incrementAndGet(this)); |
| 275 |
< |
assertEquals(2,a.get(this)); |
| 276 |
< |
a.set(this,-2); |
| 277 |
< |
assertEquals(-1,a.incrementAndGet(this)); |
| 278 |
< |
assertEquals(0,a.incrementAndGet(this)); |
| 279 |
< |
assertEquals(1,a.incrementAndGet(this)); |
| 280 |
< |
assertEquals(1,a.get(this)); |
| 274 |
> |
assertEquals(2, a.incrementAndGet(this)); |
| 275 |
> |
assertEquals(2, a.get(this)); |
| 276 |
> |
a.set(this, -2); |
| 277 |
> |
assertEquals(-1, a.incrementAndGet(this)); |
| 278 |
> |
assertEquals(0, a.incrementAndGet(this)); |
| 279 |
> |
assertEquals(1, a.incrementAndGet(this)); |
| 280 |
> |
assertEquals(1, a.get(this)); |
| 281 |
|
} |
| 282 |
|
|
| 283 |
|
} |
