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/*
* 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.AtomicLongFieldUpdater;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
volatile long x = 0;
int z;
long w;
// 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(...);
// }
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
return AtomicLongFieldUpdater.newUpdater
(AtomicLongFieldUpdaterTest.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 IllegalArgumentException
*/
public void testConstructor2() {
try {
updaterFor("z");
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* construction with non-volatile field throws IllegalArgumentException
*/
public void testConstructor3() {
try {
updaterFor("w");
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* get returns the last value set or assigned
*/
public void testGetSet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
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));
}
/**
* get returns the last value lazySet by same thread
*/
public void testGetLazySet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(1, a.get(this));
a.lazySet(this, 2);
assertEquals(2, a.get(this));
a.lazySet(this, -3);
assertEquals(-3, a.get(this));
}
/**
* compareAndSet succeeds in changing value if equal to expected else fails
*/
public void testCompareAndSet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
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));
assertEquals(-4, a.get(this));
assertTrue(a.compareAndSet(this, -4, 7));
assertEquals(7, a.get(this));
}
/**
* compareAndSet in one thread enables another waiting for value
* to succeed
*/
public void testCompareAndSetInMultipleThreads() throws Exception {
x = 1;
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
Thread.yield();
}});
t.start();
assertTrue(a.compareAndSet(this, 1, 2));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertEquals(3, a.get(this));
}
/**
* repeated weakCompareAndSet succeeds in changing value when equal
* to expected
*/
public void testWeakCompareAndSet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
do {} while (!a.weakCompareAndSet(this, 1, 2));
do {} while (!a.weakCompareAndSet(this, 2, -4));
assertEquals(-4, a.get(this));
do {} while (!a.weakCompareAndSet(this, -4, 7));
assertEquals(7, a.get(this));
}
/**
* getAndSet returns previous value and sets to given value
*/
public void testGetAndSet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(1, a.getAndSet(this, 0));
assertEquals(0, a.getAndSet(this, -10));
assertEquals(-10, a.getAndSet(this, 1));
}
/**
* getAndAdd returns previous value and adds given value
*/
public void testGetAndAdd() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(1, a.getAndAdd(this, 2));
assertEquals(3, a.get(this));
assertEquals(3, a.getAndAdd(this, -4));
assertEquals(-1, a.get(this));
}
/**
* getAndDecrement returns previous value and decrements
*/
public void testGetAndDecrement() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(1, a.getAndDecrement(this));
assertEquals(0, a.getAndDecrement(this));
assertEquals(-1, a.getAndDecrement(this));
}
/**
* getAndIncrement returns previous value and increments
*/
public void testGetAndIncrement() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
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));
}
/**
* addAndGet adds given value to current, and returns current value
*/
public void testAddAndGet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(3, a.addAndGet(this, 2));
assertEquals(3, a.get(this));
assertEquals(-1, a.addAndGet(this, -4));
assertEquals(-1, a.get(this));
}
/**
* decrementAndGet decrements and returns current value
*/
public void testDecrementAndGet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
x = 1;
assertEquals(0, a.decrementAndGet(this));
assertEquals(-1, a.decrementAndGet(this));
assertEquals(-2, a.decrementAndGet(this));
assertEquals(-2, a.get(this));
}
/**
* incrementAndGet increments and returns current value
*/
public void testIncrementAndGet() {
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
a = updaterFor("x");
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));
}
}
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