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import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.Phaser; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.atomic.AtomicLong; |
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import java.util.concurrent.atomic.AtomicReference; |
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import java.util.function.Consumer; |
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import java.util.function.Predicate; |
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import java.util.stream.Collectors; |
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import junit.framework.Test; |
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switch (rnd.nextInt(4)) { |
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case 0: survivors.addAll(c); break; |
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case 1: survivors.addAll(Arrays.asList(c.toArray())); break; |
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case 2: c.forEach(e -> survivors.add(e)); break; |
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case 2: c.forEach(survivors::add); break; |
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case 3: for (Object e : c) survivors.add(e); break; |
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} |
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assertTrue(orig.containsAll(accepts)); |
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ArrayList forEached = new ArrayList(); |
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ArrayList removeIfed = new ArrayList(); |
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for (Object x : c) iterated.add(x); |
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c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e)); |
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c.iterator().forEachRemaining(iteratedForEachRemaining::add); |
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for (Spliterator s = c.spliterator(); |
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s.tryAdvance(e -> tryAdvanced.add(e)); ) {} |
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c.spliterator().forEachRemaining(e -> spliterated.add(e)); |
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c.forEach(e -> forEached.add(e)); |
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s.tryAdvance(tryAdvanced::add); ) {} |
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c.spliterator().forEachRemaining(spliterated::add); |
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c.forEach(forEached::add); |
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c.removeIf(e -> { removeIfed.add(e); return false; }); |
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boolean ordered = |
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c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
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public void testRemoveAfterForEachRemaining() { |
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Collection c = impl.emptyCollection(); |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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{ |
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testCollection: { |
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int n = 3 + rnd.nextInt(2); |
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for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
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Iterator it = c.iterator(); |
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if (c instanceof java.util.concurrent.ArrayBlockingQueue) { |
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assertIteratorExhausted(it); |
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} else { |
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it.remove(); |
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try { it.remove(); } |
419 |
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catch (UnsupportedOperationException ok) { |
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break testCollection; |
421 |
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} |
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assertEquals(n - 1, c.size()); |
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for (int i = 0; i < n - 1; i++) |
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assertTrue(c.contains(impl.makeElement(i))); |
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assertTrue(found.isEmpty()); |
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} |
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public void testForEachConcurrentStressTest() throws Throwable { |
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/** |
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* Motley crew of threads concurrently randomly hammer the collection. |
539 |
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*/ |
540 |
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public void testDetectRaces() throws Throwable { |
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if (!impl.isConcurrent()) return; |
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final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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final Collection c = impl.emptyCollection(); |
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final long testDurationMillis = timeoutMillis(); |
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final AtomicBoolean done = new AtomicBoolean(false); |
546 |
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final Object elt = impl.makeElement(1); |
547 |
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final Future<?> f1, f2; |
546 |
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final Object one = impl.makeElement(1); |
547 |
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final Object two = impl.makeElement(2); |
548 |
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final Object[] emptyArray = |
549 |
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(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0); |
550 |
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final List<Future<?>> futures; |
551 |
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final Phaser threadsStarted = new Phaser(1); // register this thread |
552 |
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final Runnable[] frobbers = { |
553 |
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() -> c.forEach(x -> assertTrue(x == one || x == two)), |
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() -> c.stream().forEach(x -> assertTrue(x == one || x == two)), |
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() -> c.spliterator().trySplit(), |
556 |
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() -> { |
557 |
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Spliterator s = c.spliterator(); |
558 |
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s.tryAdvance(x -> assertTrue(x == one || x == two)); |
559 |
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s.trySplit(); |
560 |
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}, |
561 |
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() -> { |
562 |
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Spliterator s = c.spliterator(); |
563 |
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do {} while (s.tryAdvance(x -> assertTrue(x == one || x == two))); |
564 |
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}, |
565 |
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() -> { |
566 |
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for (Object x : c) assertTrue(x == one || x == two); |
567 |
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}, |
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() -> { |
569 |
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for (Object x : c.toArray()) assertTrue(x == one || x == two); |
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}, |
571 |
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() -> { |
572 |
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for (Object x : c.toArray(emptyArray)) assertTrue(x == one || x == two); |
573 |
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}, |
574 |
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() -> { |
575 |
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assertTrue(c.add(one)); |
576 |
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assertTrue(c.contains(one)); |
577 |
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assertTrue(c.remove(one)); |
578 |
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assertFalse(c.contains(one)); |
579 |
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}, |
580 |
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() -> { |
581 |
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assertTrue(c.add(two)); |
582 |
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assertTrue(c.contains(two)); |
583 |
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assertTrue(c.remove(two)); |
584 |
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assertFalse(c.contains(two)); |
585 |
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}, |
586 |
> |
}; |
587 |
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final List<Runnable> tasks = |
588 |
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Arrays.stream(frobbers) |
589 |
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.filter(task -> rnd.nextBoolean()) // random subset |
590 |
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.map(task -> (Runnable) () -> { |
591 |
> |
threadsStarted.arriveAndAwaitAdvance(); |
592 |
> |
while (!done.get()) |
593 |
> |
task.run(); |
594 |
> |
}) |
595 |
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.collect(Collectors.toList()); |
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final ExecutorService pool = Executors.newCachedThreadPool(); |
597 |
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try (PoolCleaner cleaner = cleaner(pool, done)) { |
598 |
< |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
599 |
< |
Runnable checkElt = () -> { |
600 |
< |
threadsStarted.countDown(); |
601 |
< |
while (!done.get()) |
602 |
< |
c.forEach(x -> assertSame(x, elt)); }; |
546 |
< |
Runnable addRemove = () -> { |
547 |
< |
threadsStarted.countDown(); |
548 |
< |
while (!done.get()) { |
549 |
< |
assertTrue(c.add(elt)); |
550 |
< |
assertTrue(c.remove(elt)); |
551 |
< |
}}; |
552 |
< |
f1 = pool.submit(checkElt); |
553 |
< |
f2 = pool.submit(addRemove); |
598 |
> |
threadsStarted.bulkRegister(tasks.size()); |
599 |
> |
futures = tasks.stream() |
600 |
> |
.map(pool::submit) |
601 |
> |
.collect(Collectors.toList()); |
602 |
> |
threadsStarted.arriveAndDeregister(); |
603 |
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Thread.sleep(testDurationMillis); |
604 |
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} |
605 |
< |
assertNull(f1.get(0L, MILLISECONDS)); |
606 |
< |
assertNull(f2.get(0L, MILLISECONDS)); |
605 |
> |
for (Future future : futures) |
606 |
> |
assertNull(future.get(0L, MILLISECONDS)); |
607 |
> |
} |
608 |
> |
|
609 |
> |
/** |
610 |
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* Spliterators are either IMMUTABLE or truly late-binding or, if |
611 |
> |
* concurrent, use the same "late-binding style" of returning |
612 |
> |
* elements added between creation and first use. |
613 |
> |
*/ |
614 |
> |
public void testLateBindingStyle() { |
615 |
> |
if (!testImplementationDetails) return; |
616 |
> |
// Immutable (snapshot) spliterators are exempt |
617 |
> |
if (impl.emptyCollection().spliterator() |
618 |
> |
.hasCharacteristics(Spliterator.IMMUTABLE)) |
619 |
> |
return; |
620 |
> |
final Object one = impl.makeElement(1); |
621 |
> |
{ |
622 |
> |
final Collection c = impl.emptyCollection(); |
623 |
> |
final Spliterator split = c.spliterator(); |
624 |
> |
c.add(one); |
625 |
> |
assertTrue(split.tryAdvance(e -> { assertSame(e, one); })); |
626 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
627 |
> |
assertTrue(c.contains(one)); |
628 |
> |
} |
629 |
> |
{ |
630 |
> |
final AtomicLong count = new AtomicLong(0); |
631 |
> |
final Collection c = impl.emptyCollection(); |
632 |
> |
final Spliterator split = c.spliterator(); |
633 |
> |
c.add(one); |
634 |
> |
split.forEachRemaining( |
635 |
> |
e -> { assertSame(e, one); count.getAndIncrement(); }); |
636 |
> |
assertEquals(1L, count.get()); |
637 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
638 |
> |
assertTrue(c.contains(one)); |
639 |
> |
} |
640 |
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} |
641 |
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|
642 |
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// public void testCollection8DebugFail() { |