| 21 |
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import java.util.Spliterator; |
| 22 |
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import java.util.concurrent.BlockingDeque; |
| 23 |
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import java.util.concurrent.BlockingQueue; |
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+ |
import java.util.concurrent.ConcurrentLinkedQueue; |
| 25 |
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import java.util.concurrent.CountDownLatch; |
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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; |
| 30 |
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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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| 38 |
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import junit.framework.Test; |
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|
| 64 |
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} |
| 65 |
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| 66 |
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/** Checks properties of empty collections. */ |
| 67 |
< |
public void testEmptyMeansEmpty() throws InterruptedException { |
| 67 |
> |
public void testEmptyMeansEmpty() throws Throwable { |
| 68 |
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Collection c = impl.emptyCollection(); |
| 69 |
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emptyMeansEmpty(c); |
| 70 |
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|
| 71 |
< |
if (c instanceof java.io.Serializable) |
| 72 |
< |
emptyMeansEmpty(serialClone(c)); |
| 71 |
> |
if (c instanceof java.io.Serializable) { |
| 72 |
> |
try { |
| 73 |
> |
emptyMeansEmpty(serialClonePossiblyFailing(c)); |
| 74 |
> |
} catch (java.io.NotSerializableException ex) { |
| 75 |
> |
// excusable when we have a serializable wrapper around |
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> |
// a non-serializable collection, as can happen with: |
| 77 |
> |
// Vector.subList() => wrapped AbstractList$RandomAccessSubList |
| 78 |
> |
if (testImplementationDetails |
| 79 |
> |
&& (! c.getClass().getName().matches( |
| 80 |
> |
"java.util.Collections.*"))) |
| 81 |
> |
throw ex; |
| 82 |
> |
} |
| 83 |
> |
} |
| 84 |
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| 85 |
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Collection clone = cloneableClone(c); |
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if (clone != null) |
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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; |
| 308 |
< |
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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} |
| 329 |
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} catch (Throwable ex) { |
| 330 |
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System.err.println(impl.klazz()); |
| 331 |
< |
System.err.printf("c=%s%n", c); |
| 331 |
> |
// c is at risk of corruption if we got here, so be lenient |
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> |
try { System.err.printf("c=%s%n", c); } |
| 333 |
> |
catch (Throwable t) { t.printStackTrace(); } |
| 334 |
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System.err.printf("n=%d%n", n); |
| 335 |
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System.err.printf("orig=%s%n", orig); |
| 336 |
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System.err.printf("accepts=%s%n", accepts); |
| 354 |
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ArrayList tryAdvanced = new ArrayList(); |
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ArrayList spliterated = new ArrayList(); |
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ArrayList forEached = new ArrayList(); |
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+ |
ArrayList streamForEached = new ArrayList(); |
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+ |
ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue(); |
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ArrayList removeIfed = new ArrayList(); |
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for (Object x : c) iterated.add(x); |
| 361 |
< |
c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e)); |
| 361 |
> |
c.iterator().forEachRemaining(iteratedForEachRemaining::add); |
| 362 |
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for (Spliterator s = c.spliterator(); |
| 363 |
< |
s.tryAdvance(e -> tryAdvanced.add(e)); ) {} |
| 364 |
< |
c.spliterator().forEachRemaining(e -> spliterated.add(e)); |
| 365 |
< |
c.forEach(e -> forEached.add(e)); |
| 363 |
> |
s.tryAdvance(tryAdvanced::add); ) {} |
| 364 |
> |
c.spliterator().forEachRemaining(spliterated::add); |
| 365 |
> |
c.forEach(forEached::add); |
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> |
c.stream().forEach(streamForEached::add); |
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> |
c.parallelStream().forEach(parallelStreamForEached::add); |
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c.removeIf(e -> { removeIfed.add(e); return false; }); |
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boolean ordered = |
| 370 |
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c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
| 371 |
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if (c instanceof List || c instanceof Deque) |
| 372 |
|
assertTrue(ordered); |
| 373 |
+ |
HashSet cset = new HashSet(c); |
| 374 |
+ |
assertEquals(cset, new HashSet(parallelStreamForEached)); |
| 375 |
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if (ordered) { |
| 376 |
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assertEquals(iterated, iteratedForEachRemaining); |
| 377 |
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assertEquals(iterated, tryAdvanced); |
| 378 |
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assertEquals(iterated, spliterated); |
| 379 |
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assertEquals(iterated, forEached); |
| 380 |
+ |
assertEquals(iterated, streamForEached); |
| 381 |
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assertEquals(iterated, removeIfed); |
| 382 |
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} else { |
| 360 |
– |
HashSet cset = new HashSet(c); |
| 383 |
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assertEquals(cset, new HashSet(iterated)); |
| 384 |
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assertEquals(cset, new HashSet(iteratedForEachRemaining)); |
| 385 |
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assertEquals(cset, new HashSet(tryAdvanced)); |
| 386 |
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assertEquals(cset, new HashSet(spliterated)); |
| 387 |
|
assertEquals(cset, new HashSet(forEached)); |
| 388 |
+ |
assertEquals(cset, new HashSet(streamForEached)); |
| 389 |
|
assertEquals(cset, new HashSet(removeIfed)); |
| 390 |
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} |
| 391 |
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if (c instanceof Deque) { |
| 410 |
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public void testRemoveAfterForEachRemaining() { |
| 411 |
|
Collection c = impl.emptyCollection(); |
| 412 |
|
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| 413 |
< |
{ |
| 413 |
> |
testCollection: { |
| 414 |
|
int n = 3 + rnd.nextInt(2); |
| 415 |
|
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
| 416 |
|
Iterator it = c.iterator(); |
| 423 |
|
if (c instanceof java.util.concurrent.ArrayBlockingQueue) { |
| 424 |
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assertIteratorExhausted(it); |
| 425 |
|
} else { |
| 426 |
< |
it.remove(); |
| 426 |
> |
try { it.remove(); } |
| 427 |
> |
catch (UnsupportedOperationException ok) { |
| 428 |
> |
break testCollection; |
| 429 |
> |
} |
| 430 |
|
assertEquals(n - 1, c.size()); |
| 431 |
|
for (int i = 0; i < n - 1; i++) |
| 432 |
|
assertTrue(c.contains(impl.makeElement(i))); |
| 542 |
|
assertTrue(found.isEmpty()); |
| 543 |
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} |
| 544 |
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|
| 545 |
< |
public void testForEachConcurrentStressTest() throws Throwable { |
| 545 |
> |
/** |
| 546 |
> |
* Motley crew of threads concurrently randomly hammer the collection. |
| 547 |
> |
*/ |
| 548 |
> |
public void testDetectRaces() throws Throwable { |
| 549 |
|
if (!impl.isConcurrent()) return; |
| 550 |
+ |
final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| 551 |
|
final Collection c = impl.emptyCollection(); |
| 552 |
|
final long testDurationMillis = timeoutMillis(); |
| 553 |
|
final AtomicBoolean done = new AtomicBoolean(false); |
| 554 |
< |
final Object elt = impl.makeElement(1); |
| 555 |
< |
final Future<?> f1, f2; |
| 554 |
> |
final Object one = impl.makeElement(1); |
| 555 |
> |
final Object two = impl.makeElement(2); |
| 556 |
> |
final Object[] emptyArray = |
| 557 |
> |
(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0); |
| 558 |
> |
final List<Future<?>> futures; |
| 559 |
> |
final Phaser threadsStarted = new Phaser(1); // register this thread |
| 560 |
> |
final Consumer checkSanity = x -> assertTrue(x == one || x == two); |
| 561 |
> |
final Runnable[] frobbers = { |
| 562 |
> |
() -> c.forEach(checkSanity), |
| 563 |
> |
() -> c.stream().forEach(checkSanity), |
| 564 |
> |
() -> c.parallelStream().forEach(checkSanity), |
| 565 |
> |
() -> c.spliterator().trySplit(), |
| 566 |
> |
() -> { |
| 567 |
> |
Spliterator s = c.spliterator(); |
| 568 |
> |
s.tryAdvance(checkSanity); |
| 569 |
> |
s.trySplit(); |
| 570 |
> |
}, |
| 571 |
> |
() -> { |
| 572 |
> |
Spliterator s = c.spliterator(); |
| 573 |
> |
do {} while (s.tryAdvance(checkSanity)); |
| 574 |
> |
}, |
| 575 |
> |
() -> { for (Object x : c) checkSanity.accept(x); }, |
| 576 |
> |
() -> { for (Object x : c.toArray()) checkSanity.accept(x); }, |
| 577 |
> |
() -> { for (Object x : c.toArray(emptyArray)) checkSanity.accept(x); }, |
| 578 |
> |
() -> { |
| 579 |
> |
assertTrue(c.add(one)); |
| 580 |
> |
assertTrue(c.contains(one)); |
| 581 |
> |
assertTrue(c.remove(one)); |
| 582 |
> |
assertFalse(c.contains(one)); |
| 583 |
> |
}, |
| 584 |
> |
() -> { |
| 585 |
> |
assertTrue(c.add(two)); |
| 586 |
> |
assertTrue(c.contains(two)); |
| 587 |
> |
assertTrue(c.remove(two)); |
| 588 |
> |
assertFalse(c.contains(two)); |
| 589 |
> |
}, |
| 590 |
> |
}; |
| 591 |
> |
final List<Runnable> tasks = |
| 592 |
> |
Arrays.stream(frobbers) |
| 593 |
> |
.filter(task -> rnd.nextBoolean()) // random subset |
| 594 |
> |
.map(task -> (Runnable) () -> { |
| 595 |
> |
threadsStarted.arriveAndAwaitAdvance(); |
| 596 |
> |
while (!done.get()) |
| 597 |
> |
task.run(); |
| 598 |
> |
}) |
| 599 |
> |
.collect(Collectors.toList()); |
| 600 |
|
final ExecutorService pool = Executors.newCachedThreadPool(); |
| 601 |
|
try (PoolCleaner cleaner = cleaner(pool, done)) { |
| 602 |
< |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
| 603 |
< |
Runnable checkElt = () -> { |
| 604 |
< |
threadsStarted.countDown(); |
| 605 |
< |
while (!done.get()) |
| 606 |
< |
c.forEach(x -> assertSame(x, elt)); }; |
| 533 |
< |
Runnable addRemove = () -> { |
| 534 |
< |
threadsStarted.countDown(); |
| 535 |
< |
while (!done.get()) { |
| 536 |
< |
assertTrue(c.add(elt)); |
| 537 |
< |
assertTrue(c.remove(elt)); |
| 538 |
< |
}}; |
| 539 |
< |
f1 = pool.submit(checkElt); |
| 540 |
< |
f2 = pool.submit(addRemove); |
| 602 |
> |
threadsStarted.bulkRegister(tasks.size()); |
| 603 |
> |
futures = tasks.stream() |
| 604 |
> |
.map(pool::submit) |
| 605 |
> |
.collect(Collectors.toList()); |
| 606 |
> |
threadsStarted.arriveAndDeregister(); |
| 607 |
|
Thread.sleep(testDurationMillis); |
| 608 |
|
} |
| 609 |
< |
assertNull(f1.get(0L, MILLISECONDS)); |
| 610 |
< |
assertNull(f2.get(0L, MILLISECONDS)); |
| 609 |
> |
for (Future future : futures) |
| 610 |
> |
assertNull(future.get(0L, MILLISECONDS)); |
| 611 |
> |
} |
| 612 |
> |
|
| 613 |
> |
/** |
| 614 |
> |
* Spliterators are either IMMUTABLE or truly late-binding or, if |
| 615 |
> |
* concurrent, use the same "late-binding style" of returning |
| 616 |
> |
* elements added between creation and first use. |
| 617 |
> |
*/ |
| 618 |
> |
public void testLateBindingStyle() { |
| 619 |
> |
if (!testImplementationDetails) return; |
| 620 |
> |
if (impl.klazz() == ArrayList.class) return; // for jdk8 |
| 621 |
> |
// Immutable (snapshot) spliterators are exempt |
| 622 |
> |
if (impl.emptyCollection().spliterator() |
| 623 |
> |
.hasCharacteristics(Spliterator.IMMUTABLE)) |
| 624 |
> |
return; |
| 625 |
> |
final Object one = impl.makeElement(1); |
| 626 |
> |
{ |
| 627 |
> |
final Collection c = impl.emptyCollection(); |
| 628 |
> |
final Spliterator split = c.spliterator(); |
| 629 |
> |
c.add(one); |
| 630 |
> |
assertTrue(split.tryAdvance(e -> { assertSame(e, one); })); |
| 631 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
| 632 |
> |
assertTrue(c.contains(one)); |
| 633 |
> |
} |
| 634 |
> |
{ |
| 635 |
> |
final AtomicLong count = new AtomicLong(0); |
| 636 |
> |
final Collection c = impl.emptyCollection(); |
| 637 |
> |
final Spliterator split = c.spliterator(); |
| 638 |
> |
c.add(one); |
| 639 |
> |
split.forEachRemaining( |
| 640 |
> |
e -> { assertSame(e, one); count.getAndIncrement(); }); |
| 641 |
> |
assertEquals(1L, count.get()); |
| 642 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
| 643 |
> |
assertTrue(c.contains(one)); |
| 644 |
> |
} |
| 645 |
|
} |
| 646 |
|
|
| 647 |
|
// public void testCollection8DebugFail() { |
