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root/jsr166/jsr166/src/test/tck/Collection8Test.java

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.25 by jsr166, Tue Nov 15 00:08:25 2016 UTC vs.
Revision 1.48 by jsr166, Sat Mar 24 14:46:18 2018 UTC

#	Line 12 | Line 12 | import java.util.ArrayList;
12		import java.util.Arrays;
13		import java.util.Collection;
14		import java.util.Collections;
15	+	import java.util.ConcurrentModificationException;
16		import java.util.Deque;
17		import java.util.HashSet;
18		import java.util.Iterator;
19		import java.util.List;
20		import java.util.NoSuchElementException;
21		import java.util.Queue;
22	+	import java.util.Set;
23		import java.util.Spliterator;
24		import java.util.concurrent.BlockingDeque;
25		import java.util.concurrent.BlockingQueue;
26	+	import java.util.concurrent.ConcurrentLinkedQueue;
27		import java.util.concurrent.CountDownLatch;
28		import java.util.concurrent.Executors;
29		import java.util.concurrent.ExecutorService;
30		import java.util.concurrent.Future;
31	+	import java.util.concurrent.Phaser;
32		import java.util.concurrent.ThreadLocalRandom;
33		import java.util.concurrent.atomic.AtomicBoolean;
34		import java.util.concurrent.atomic.AtomicLong;
35		import java.util.concurrent.atomic.AtomicReference;
36		import java.util.function.Consumer;
37		import java.util.function.Predicate;
38	+	import java.util.stream.Collectors;
39
40		import junit.framework.Test;
41
#	Line 55 | Line 60 | public class Collection8Test extends JSR
60
61		Object bomb() {
62		return new Object() {
63	<	public boolean equals(Object x) { throw new AssertionError(); }
64	<	public int hashCode() { throw new AssertionError(); }
65	<	};
63	>	@Override public boolean equals(Object x) { throw new AssertionError(); }
64	>	@Override public int hashCode() { throw new AssertionError(); }
65	>	@Override public String toString() { throw new AssertionError(); }
66	>	};
67		}
68
69		/** Checks properties of empty collections. */
#	Line 88 | Line 94 | public class Collection8Test extends JSR
94		assertTrue(c.isEmpty());
95		assertEquals(0, c.size());
96		assertEquals("[]", c.toString());
97	+	if (c instanceof List<?>) {
98	+	List x = (List) c;
99	+	assertEquals(1, x.hashCode());
100	+	assertEquals(x, Collections.emptyList());
101	+	assertEquals(Collections.emptyList(), x);
102	+	assertEquals(-1, x.indexOf(impl.makeElement(86)));
103	+	assertEquals(-1, x.lastIndexOf(impl.makeElement(99)));
104	+	}
105	+	else if (c instanceof Set<?>) {
106	+	assertEquals(0, c.hashCode());
107	+	assertEquals(c, Collections.emptySet());
108	+	assertEquals(Collections.emptySet(), c);
109	+	}
110		{
111		Object[] a = c.toArray();
112		assertEquals(0, a.length);
#	Line 136 | Line 155 | public class Collection8Test extends JSR
155		}
156		if (c instanceof BlockingQueue) {
157		BlockingQueue q = (BlockingQueue) c;
158	<	assertNull(q.poll(0L, MILLISECONDS));
158	>	assertNull(q.poll(randomExpiredTimeout(), randomTimeUnit()));
159		}
160		if (c instanceof BlockingDeque) {
161		BlockingDeque q = (BlockingDeque) c;
162	<	assertNull(q.pollFirst(0L, MILLISECONDS));
163	<	assertNull(q.pollLast(0L, MILLISECONDS));
162	>	assertNull(q.pollFirst(randomExpiredTimeout(), randomTimeUnit()));
163	>	assertNull(q.pollLast(randomExpiredTimeout(), randomTimeUnit()));
164		}
165		}
166
#	Line 248 | Line 267 | public class Collection8Test extends JSR
267		() -> d.pop(),
268		() -> d.descendingIterator().next());
269		}
270	+	if (c instanceof List) {
271	+	List x = (List) c;
272	+	assertThrows(
273	+	NoSuchElementException.class,
274	+	() -> x.iterator().next(),
275	+	() -> x.listIterator().next(),
276	+	() -> x.listIterator(0).next(),
277	+	() -> x.listIterator().previous(),
278	+	() -> x.listIterator(0).previous());
279	+	}
280		}
281
282		public void testRemoveIf() {
#	Line 302 | Line 331 | public class Collection8Test extends JSR
331		switch (rnd.nextInt(4)) {
332		case 0: survivors.addAll(c); break;
333		case 1: survivors.addAll(Arrays.asList(c.toArray())); break;
334	<	case 2: c.forEach(e -> survivors.add(e)); break;
334	>	case 2: c.forEach(survivors::add); break;
335		case 3: for (Object e : c) survivors.add(e); break;
336		}
337		assertTrue(orig.containsAll(accepts));
#	Line 339 | Line 368 | public class Collection8Test extends JSR
368		}
369
370		/**
371	+	* All elements removed in the middle of CONCURRENT traversal.
372	+	*/
373	+	public void testElementRemovalDuringTraversal() {
374	+	Collection c = impl.emptyCollection();
375	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
376	+	int n = rnd.nextInt(6);
377	+	ArrayList copy = new ArrayList();
378	+	for (int i = 0; i < n; i++) {
379	+	Object x = impl.makeElement(i);
380	+	copy.add(x);
381	+	c.add(x);
382	+	}
383	+	ArrayList iterated = new ArrayList();
384	+	ArrayList spliterated = new ArrayList();
385	+	Spliterator s = c.spliterator();
386	+	Iterator it = c.iterator();
387	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
388	+	assertTrue(s.tryAdvance(spliterated::add));
389	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
390	+	iterated.add(it.next());
391	+	}
392	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
393	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
394	+	c.clear();          // TODO: many more removal methods
395	+	if (testImplementationDetails
396	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue)) {
397	+	if (rnd.nextBoolean())
398	+	assertFalse(s.tryAdvance(alwaysThrows));
399	+	else
400	+	s.forEachRemaining(alwaysThrows);
401	+	}
402	+	if (it.hasNext()) iterated.add(it.next());
403	+	if (rnd.nextBoolean()) assertIteratorExhausted(it);
404	+	}
405	+	assertTrue(copy.containsAll(iterated));
406	+	assertTrue(copy.containsAll(spliterated));
407	+	}
408	+
409	+	/**
410	+	* Some elements randomly disappear in the middle of traversal.
411	+	*/
412	+	public void testRandomElementRemovalDuringTraversal() {
413	+	Collection c = impl.emptyCollection();
414	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
415	+	int n = rnd.nextInt(6);
416	+	ArrayList copy = new ArrayList();
417	+	for (int i = 0; i < n; i++) {
418	+	Object x = impl.makeElement(i);
419	+	copy.add(x);
420	+	c.add(x);
421	+	}
422	+	ArrayList iterated = new ArrayList();
423	+	ArrayList spliterated = new ArrayList();
424	+	ArrayList removed = new ArrayList();
425	+	Spliterator s = c.spliterator();
426	+	Iterator it = c.iterator();
427	+	if (! (s.hasCharacteristics(Spliterator.CONCURRENT) ||
428	+	s.hasCharacteristics(Spliterator.IMMUTABLE)))
429	+	return;
430	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
431	+	assertTrue(s.tryAdvance(e -> {}));
432	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
433	+	it.next();
434	+	}
435	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
436	+	// TODO: many more removal methods
437	+	if (rnd.nextBoolean()) {
438	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
439	+	Object e = z.next();
440	+	if (rnd.nextBoolean()) {
441	+	try {
442	+	z.remove();
443	+	} catch (UnsupportedOperationException ok) { return; }
444	+	removed.add(e);
445	+	}
446	+	}
447	+	} else {
448	+	Predicate randomlyRemove = e -> {
449	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
450	+	else return false;
451	+	};
452	+	c.removeIf(randomlyRemove);
453	+	}
454	+	s.forEachRemaining(spliterated::add);
455	+	while (it.hasNext())
456	+	iterated.add(it.next());
457	+	assertTrue(copy.containsAll(iterated));
458	+	assertTrue(copy.containsAll(spliterated));
459	+	assertTrue(copy.containsAll(removed));
460	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
461	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
462	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
463	+	iteratedAndRemoved.retainAll(removed);
464	+	spliteratedAndRemoved.retainAll(removed);
465	+	assertTrue(iteratedAndRemoved.size() <= 1);
466	+	assertTrue(spliteratedAndRemoved.size() <= 1);
467	+	if (testImplementationDetails
468	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
469	+	assertTrue(spliteratedAndRemoved.isEmpty());
470	+	}
471	+	}
472	+
473	+	/**
474		* Various ways of traversing a collection yield same elements
475		*/
476	<	public void testIteratorEquivalence() {
476	>	public void testTraversalEquivalence() {
477		Collection c = impl.emptyCollection();
478		ThreadLocalRandom rnd = ThreadLocalRandom.current();
479		int n = rnd.nextInt(6);
#	Line 350 | Line 482 | public class Collection8Test extends JSR
482		ArrayList iteratedForEachRemaining = new ArrayList();
483		ArrayList tryAdvanced = new ArrayList();
484		ArrayList spliterated = new ArrayList();
485	+	ArrayList splitonced = new ArrayList();
486		ArrayList forEached = new ArrayList();
487	+	ArrayList streamForEached = new ArrayList();
488	+	ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue();
489		ArrayList removeIfed = new ArrayList();
490		for (Object x : c) iterated.add(x);
491	<	c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e));
491	>	c.iterator().forEachRemaining(iteratedForEachRemaining::add);
492		for (Spliterator s = c.spliterator();
493	<	s.tryAdvance(e -> tryAdvanced.add(e)); ) {}
494	<	c.spliterator().forEachRemaining(e -> spliterated.add(e));
495	<	c.forEach(e -> forEached.add(e));
493	>	s.tryAdvance(tryAdvanced::add); ) {}
494	>	c.spliterator().forEachRemaining(spliterated::add);
495	>	{                       // trySplit returns "strict prefix"
496	>	Spliterator s1 = c.spliterator(), s2 = s1.trySplit();
497	>	if (s2 != null) s2.forEachRemaining(splitonced::add);
498	>	s1.forEachRemaining(splitonced::add);
499	>	}
500	>	c.forEach(forEached::add);
501	>	c.stream().forEach(streamForEached::add);
502	>	c.parallelStream().forEach(parallelStreamForEached::add);
503		c.removeIf(e -> { removeIfed.add(e); return false; });
504		boolean ordered =
505		c.spliterator().hasCharacteristics(Spliterator.ORDERED);
506		if (c instanceof List || c instanceof Deque)
507		assertTrue(ordered);
508	+	HashSet cset = new HashSet(c);
509	+	assertEquals(cset, new HashSet(parallelStreamForEached));
510		if (ordered) {
511		assertEquals(iterated, iteratedForEachRemaining);
512		assertEquals(iterated, tryAdvanced);
513		assertEquals(iterated, spliterated);
514	+	assertEquals(iterated, splitonced);
515		assertEquals(iterated, forEached);
516	+	assertEquals(iterated, streamForEached);
517		assertEquals(iterated, removeIfed);
518		} else {
373	–	HashSet cset = new HashSet(c);
519		assertEquals(cset, new HashSet(iterated));
520		assertEquals(cset, new HashSet(iteratedForEachRemaining));
521		assertEquals(cset, new HashSet(tryAdvanced));
522		assertEquals(cset, new HashSet(spliterated));
523	+	assertEquals(cset, new HashSet(splitonced));
524		assertEquals(cset, new HashSet(forEached));
525	+	assertEquals(cset, new HashSet(streamForEached));
526		assertEquals(cset, new HashSet(removeIfed));
527		}
528		if (c instanceof Deque) {
#	Line 394 | Line 541 | public class Collection8Test extends JSR
541		}
542
543		/**
544	+	* Iterator.forEachRemaining has same behavior as Iterator's
545	+	* default implementation.
546	+	*/
547	+	public void testForEachRemainingConsistentWithDefaultImplementation() {
548	+	Collection c = impl.emptyCollection();
549	+	if (!testImplementationDetails
550	+	|| c.getClass() == java.util.LinkedList.class)
551	+	return;
552	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
553	+	int n = 1 + rnd.nextInt(3);
554	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
555	+	ArrayList iterated = new ArrayList();
556	+	ArrayList iteratedForEachRemaining = new ArrayList();
557	+	Iterator it1 = c.iterator();
558	+	Iterator it2 = c.iterator();
559	+	assertTrue(it1.hasNext());
560	+	assertTrue(it2.hasNext());
561	+	c.clear();
562	+	Object r1, r2;
563	+	try {
564	+	while (it1.hasNext()) iterated.add(it1.next());
565	+	r1 = iterated;
566	+	} catch (ConcurrentModificationException ex) {
567	+	r1 = ConcurrentModificationException.class;
568	+	assertFalse(impl.isConcurrent());
569	+	}
570	+	try {
571	+	it2.forEachRemaining(iteratedForEachRemaining::add);
572	+	r2 = iteratedForEachRemaining;
573	+	} catch (ConcurrentModificationException ex) {
574	+	r2 = ConcurrentModificationException.class;
575	+	assertFalse(impl.isConcurrent());
576	+	}
577	+	assertEquals(r1, r2);
578	+	}
579	+
580	+	/**
581		* Calling Iterator#remove() after Iterator#forEachRemaining
582		* should (maybe) remove last element
583		*/
#	Line 532 | Line 716 | public class Collection8Test extends JSR
716		assertTrue(found.isEmpty());
717		}
718
719	<	public void testForEachConcurrentStressTest() throws Throwable {
719	>	/** TODO: promote to a common utility */
720	>	static <T> T chooseOne(T ... ts) {
721	>	return ts[ThreadLocalRandom.current().nextInt(ts.length)];
722	>	}
723	>
724	>	/** TODO: more random adders and removers */
725	>	static <E> Runnable adderRemover(Collection<E> c, E e) {
726	>	return chooseOne(
727	>	() -> {
728	>	assertTrue(c.add(e));
729	>	assertTrue(c.contains(e));
730	>	assertTrue(c.remove(e));
731	>	assertFalse(c.contains(e));
732	>	},
733	>	() -> {
734	>	assertTrue(c.add(e));
735	>	assertTrue(c.contains(e));
736	>	assertTrue(c.removeIf(x -> x == e));
737	>	assertFalse(c.contains(e));
738	>	},
739	>	() -> {
740	>	assertTrue(c.add(e));
741	>	assertTrue(c.contains(e));
742	>	for (Iterator it = c.iterator();; )
743	>	if (it.next() == e) {
744	>	try { it.remove(); }
745	>	catch (UnsupportedOperationException ok) {
746	>	c.remove(e);
747	>	}
748	>	break;
749	>	}
750	>	assertFalse(c.contains(e));
751	>	});
752	>	}
753	>
754	>	/**
755	>	* Concurrent Spliterators, once exhausted, stay exhausted.
756	>	*/
757	>	public void testStickySpliteratorExhaustion() throws Throwable {
758		if (!impl.isConcurrent()) return;
759	+	if (!testImplementationDetails) return;
760	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
761	+	final Consumer alwaysThrows = e -> { throw new AssertionError(); };
762		final Collection c = impl.emptyCollection();
763	<	final long testDurationMillis = timeoutMillis();
763	>	final Spliterator s = c.spliterator();
764	>	if (rnd.nextBoolean()) {
765	>	assertFalse(s.tryAdvance(alwaysThrows));
766	>	} else {
767	>	s.forEachRemaining(alwaysThrows);
768	>	}
769	>	final Object one = impl.makeElement(1);
770	>	// Spliterator should not notice added element
771	>	c.add(one);
772	>	if (rnd.nextBoolean()) {
773	>	assertFalse(s.tryAdvance(alwaysThrows));
774	>	} else {
775	>	s.forEachRemaining(alwaysThrows);
776	>	}
777	>	}
778	>
779	>	/**
780	>	* Motley crew of threads concurrently randomly hammer the collection.
781	>	*/
782	>	public void testDetectRaces() throws Throwable {
783	>	if (!impl.isConcurrent()) return;
784	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
785	>	final Collection c = impl.emptyCollection();
786	>	final long testDurationMillis
787	>	= expensiveTests ? LONG_DELAY_MS : timeoutMillis();
788		final AtomicBoolean done = new AtomicBoolean(false);
789	<	final Object elt = impl.makeElement(1);
790	<	final Future<?> f1, f2;
789	>	final Object one = impl.makeElement(1);
790	>	final Object two = impl.makeElement(2);
791	>	final Consumer checkSanity = x -> assertTrue(x == one || x == two);
792	>	final Consumer<Object[]> checkArraySanity = array -> {
793	>	// assertTrue(array.length <= 2); // duplicates are permitted
794	>	for (Object x : array) assertTrue(x == one || x == two);
795	>	};
796	>	final Object[] emptyArray =
797	>	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
798	>	final List<Future<?>> futures;
799	>	final Phaser threadsStarted = new Phaser(1); // register this thread
800	>	final Runnable[] frobbers = {
801	>	() -> c.forEach(checkSanity),
802	>	() -> c.stream().forEach(checkSanity),
803	>	() -> c.parallelStream().forEach(checkSanity),
804	>	() -> c.spliterator().trySplit(),
805	>	() -> {
806	>	Spliterator s = c.spliterator();
807	>	s.tryAdvance(checkSanity);
808	>	s.trySplit();
809	>	},
810	>	() -> {
811	>	Spliterator s = c.spliterator();
812	>	do {} while (s.tryAdvance(checkSanity));
813	>	},
814	>	() -> { for (Object x : c) checkSanity.accept(x); },
815	>	() -> checkArraySanity.accept(c.toArray()),
816	>	() -> checkArraySanity.accept(c.toArray(emptyArray)),
817	>	() -> {
818	>	Object[] a = new Object[5];
819	>	Object three = impl.makeElement(3);
820	>	Arrays.fill(a, 0, a.length, three);
821	>	Object[] x = c.toArray(a);
822	>	if (x == a)
823	>	for (int i = 0; i < a.length && a[i] != null; i++)
824	>	checkSanity.accept(a[i]);
825	>	// A careful reading of the spec does not support:
826	>	// for (i++; i < a.length; i++) assertSame(three, a[i]);
827	>	else
828	>	checkArraySanity.accept(x);
829	>	},
830	>	adderRemover(c, one),
831	>	adderRemover(c, two),
832	>	};
833	>	final List<Runnable> tasks =
834	>	Arrays.stream(frobbers)
835	>	.filter(task -> rnd.nextBoolean()) // random subset
836	>	.map(task -> (Runnable) () -> {
837	>	threadsStarted.arriveAndAwaitAdvance();
838	>	while (!done.get())
839	>	task.run();
840	>	})
841	>	.collect(Collectors.toList());
842		final ExecutorService pool = Executors.newCachedThreadPool();
843		try (PoolCleaner cleaner = cleaner(pool, done)) {
844	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
845	<	Runnable checkElt = () -> {
846	<	threadsStarted.countDown();
847	<	while (!done.get())
848	<	c.forEach(x -> assertSame(x, elt)); };
549	<	Runnable addRemove = () -> {
550	<	threadsStarted.countDown();
551	<	while (!done.get()) {
552	<	assertTrue(c.add(elt));
553	<	assertTrue(c.remove(elt));
554	<	}};
555	<	f1 = pool.submit(checkElt);
556	<	f2 = pool.submit(addRemove);
844	>	threadsStarted.bulkRegister(tasks.size());
845	>	futures = tasks.stream()
846	>	.map(pool::submit)
847	>	.collect(Collectors.toList());
848	>	threadsStarted.arriveAndDeregister();
849		Thread.sleep(testDurationMillis);
850		}
851	<	assertNull(f1.get(0L, MILLISECONDS));
852	<	assertNull(f2.get(0L, MILLISECONDS));
851	>	for (Future future : futures)
852	>	assertNull(future.get(0L, MILLISECONDS));
853	>	}
854	>
855	>	/**
856	>	* Spliterators are either IMMUTABLE or truly late-binding or, if
857	>	* concurrent, use the same "late-binding style" of returning
858	>	* elements added between creation and first use.
859	>	*/
860	>	public void testLateBindingStyle() {
861	>	if (!testImplementationDetails) return;
862	>	if (impl.klazz() == ArrayList.class) return; // for jdk8
863	>	// Immutable (snapshot) spliterators are exempt
864	>	if (impl.emptyCollection().spliterator()
865	>	.hasCharacteristics(Spliterator.IMMUTABLE))
866	>	return;
867	>	final Object one = impl.makeElement(1);
868	>	{
869	>	final Collection c = impl.emptyCollection();
870	>	final Spliterator split = c.spliterator();
871	>	c.add(one);
872	>	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
873	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
874	>	assertTrue(c.contains(one));
875	>	}
876	>	{
877	>	final AtomicLong count = new AtomicLong(0);
878	>	final Collection c = impl.emptyCollection();
879	>	final Spliterator split = c.spliterator();
880	>	c.add(one);
881	>	split.forEachRemaining(
882	>	e -> { assertSame(e, one); count.getAndIncrement(); });
883	>	assertEquals(1L, count.get());
884	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
885	>	assertTrue(c.contains(one));
886	>	}
887	>	}
888	>
889	>	/**
890	>	* Spliterator.getComparator throws IllegalStateException iff the
891	>	* spliterator does not report SORTED.
892	>	*/
893	>	public void testGetComparator_IllegalStateException() {
894	>	Collection c = impl.emptyCollection();
895	>	Spliterator s = c.spliterator();
896	>	boolean reportsSorted = s.hasCharacteristics(Spliterator.SORTED);
897	>	try {
898	>	s.getComparator();
899	>	assertTrue(reportsSorted);
900	>	} catch (IllegalStateException ex) {
901	>	assertFalse(reportsSorted);
902	>	}
903		}
904
905		//     public void testCollection8DebugFail() {

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