AtomicLongArrayTestpublic class AtomicLongArrayTest extends JSR166TestCase
| Fields Summary |
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| static final long | COUNTDOWN |
| Methods Summary |
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| public static void | main(java.lang.String[] args)
junit.textui.TestRunner.run (suite());
| | public static junit.framework.Test | suite()
return new TestSuite(AtomicLongArrayTest.class);
| | public void | testAddAndGet()addAndGet adds given value to current, and returns current value
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(3,ai.addAndGet(i,2));
assertEquals(3,ai.get(i));
assertEquals(-1,ai.addAndGet(i,-4));
assertEquals(-1,ai.get(i));
}
| | public void | testCompareAndSet()compareAndSet succeeds in changing value if equal to expected else fails
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertTrue(ai.compareAndSet(i, 1,2));
assertTrue(ai.compareAndSet(i, 2,-4));
assertEquals(-4,ai.get(i));
assertFalse(ai.compareAndSet(i, -5,7));
assertFalse((7 == ai.get(i)));
assertTrue(ai.compareAndSet(i, -4,7));
assertEquals(7,ai.get(i));
}
| | public void | testCompareAndSetInMultipleThreads()compareAndSet in one thread enables another waiting for value
to succeed
final AtomicLongArray a = new AtomicLongArray(1);
a.set(0, 1);
Thread t = new Thread(new Runnable() {
public void run() {
while(!a.compareAndSet(0, 2, 3)) Thread.yield();
}});
try {
t.start();
assertTrue(a.compareAndSet(0, 1, 2));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertEquals(a.get(0), 3);
}
catch(Exception e) {
unexpectedException();
}
| | public void | testConstructor()constructor creates array of given size with all elements zero
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i)
assertEquals(0,ai.get(i));
| | public void | testConstructor2()constructor with array is of same size and has all elements
long[] a = { 17L, 3L, -42L, 99L, -7L};
AtomicLongArray ai = new AtomicLongArray(a);
assertEquals(a.length, ai.length());
for (int i = 0; i < a.length; ++i)
assertEquals(a[i], ai.get(i));
| | public void | testConstructor2NPE()constructor with null array throws NPE
try {
long[] a = null;
AtomicLongArray ai = new AtomicLongArray(a);
} catch (NullPointerException success) {
} catch (Exception ex) {
unexpectedException();
}
| | public void | testCountingInMultipleThreads()Multiple threads using same array of counters successfully
update a number of times equal to total count
try {
final AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i)
ai.set(i, COUNTDOWN);
Counter c1 = new Counter(ai);
Counter c2 = new Counter(ai);
Thread t1 = new Thread(c1);
Thread t2 = new Thread(c2);
t1.start();
t2.start();
t1.join();
t2.join();
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
}
catch(InterruptedException ie) {
unexpectedException();
}
| | public void | testDecrementAndGet()decrementAndGet decrements and returns current value
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(0,ai.decrementAndGet(i));
assertEquals(-1,ai.decrementAndGet(i));
assertEquals(-2,ai.decrementAndGet(i));
assertEquals(-2,ai.get(i));
}
| | public void | testGetAndAdd()getAndAdd returns previous value and adds given value
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(1,ai.getAndAdd(i,2));
assertEquals(3,ai.get(i));
assertEquals(3,ai.getAndAdd(i,-4));
assertEquals(-1,ai.get(i));
}
| | public void | testGetAndDecrement()getAndDecrement returns previous value and decrements
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(1,ai.getAndDecrement(i));
assertEquals(0,ai.getAndDecrement(i));
assertEquals(-1,ai.getAndDecrement(i));
}
| | public void | testGetAndIncrement()getAndIncrement returns previous value and increments
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(1,ai.getAndIncrement(i));
assertEquals(2,ai.get(i));
ai.set(i,-2);
assertEquals(-2,ai.getAndIncrement(i));
assertEquals(-1,ai.getAndIncrement(i));
assertEquals(0,ai.getAndIncrement(i));
assertEquals(1,ai.get(i));
}
| | public void | testGetAndSet()getAndSet returns previous value and sets to given value at given index
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(1,ai.getAndSet(i,0));
assertEquals(0,ai.getAndSet(i,-10));
assertEquals(-10,ai.getAndSet(i,1));
}
| | public void | testGetSet()get returns the last value set at index
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(1,ai.get(i));
ai.set(i, 2);
assertEquals(2,ai.get(i));
ai.set(i, -3);
assertEquals(-3,ai.get(i));
}
| | public void | testIncrementAndGet()incrementAndGet increments and returns current value
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
assertEquals(2,ai.incrementAndGet(i));
assertEquals(2,ai.get(i));
ai.set(i, -2);
assertEquals(-1,ai.incrementAndGet(i));
assertEquals(0,ai.incrementAndGet(i));
assertEquals(1,ai.incrementAndGet(i));
assertEquals(1,ai.get(i));
}
| | public void | testIndexing()get and set for out of bound indices throw IndexOutOfBoundsException
AtomicLongArray ai = new AtomicLongArray(SIZE);
try {
ai.get(SIZE);
} catch(IndexOutOfBoundsException success){
}
try {
ai.get(-1);
} catch(IndexOutOfBoundsException success){
}
try {
ai.set(SIZE, 0);
} catch(IndexOutOfBoundsException success){
}
try {
ai.set(-1, 0);
} catch(IndexOutOfBoundsException success){
}
| | public void | testSerialization()a deserialized serialized array holds same values
AtomicLongArray l = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i)
l.set(i, -i);
try {
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
out.writeObject(l);
out.close();
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
AtomicLongArray r = (AtomicLongArray) in.readObject();
for (int i = 0; i < SIZE; ++i) {
assertEquals(l.get(i), r.get(i));
}
} catch(Exception e){
unexpectedException();
}
| | public void | testToString()toString returns current value.
long[] a = { 17, 3, -42, 99, -7};
AtomicLongArray ai = new AtomicLongArray(a);
assertEquals(Arrays.toString(a), ai.toString());
| | public void | testWeakCompareAndSet()repeated weakCompareAndSet succeeds in changing value when equal
to expected
AtomicLongArray ai = new AtomicLongArray(SIZE);
for (int i = 0; i < SIZE; ++i) {
ai.set(i, 1);
while(!ai.weakCompareAndSet(i, 1,2));
while(!ai.weakCompareAndSet(i, 2,-4));
assertEquals(-4,ai.get(i));
while(!ai.weakCompareAndSet(i, -4,7));
assertEquals(7,ai.get(i));
}
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