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

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.38 by jsr166, Wed Dec 7 22:03:41 2016 UTC vs.
Revision 1.39 by jsr166, Sun Dec 11 19:59:51 2016 UTC

#	Line 342 | Line 342 | public class Collection8Test extends JSR
342		}
343
344		/**
345	+	* All elements removed in the middle of CONCURRENT traversal.
346	+	*/
347	+	public void testElementRemovalDuringTraversal() {
348	+	Collection c = impl.emptyCollection();
349	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
350	+	int n = rnd.nextInt(6);
351	+	ArrayList copy = new ArrayList();
352	+	for (int i = 0; i < n; i++) {
353	+	Object x = impl.makeElement(i);
354	+	copy.add(x);
355	+	c.add(x);
356	+	}
357	+	ArrayList iterated = new ArrayList();
358	+	ArrayList spliterated = new ArrayList();
359	+	Spliterator s = c.spliterator();
360	+	Iterator it = c.iterator();
361	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
362	+	assertTrue(s.tryAdvance(spliterated::add));
363	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
364	+	iterated.add(it.next());
365	+	}
366	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
367	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
368	+	c.clear();          // TODO: many more removal methods
369	+	if (testImplementationDetails
370	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue)) {
371	+	if (rnd.nextBoolean())
372	+	assertFalse(s.tryAdvance(alwaysThrows));
373	+	else
374	+	s.forEachRemaining(alwaysThrows);
375	+	}
376	+	if (it.hasNext()) iterated.add(it.next());
377	+	if (rnd.nextBoolean()) assertIteratorExhausted(it);
378	+	}
379	+	assertTrue(copy.containsAll(iterated));
380	+	assertTrue(copy.containsAll(spliterated));
381	+	}
382	+
383	+	/**
384	+	* Some elements randomly disappear in the middle of traversal.
385	+	*/
386	+	public void testRandomElementRemovalDuringTraversal() {
387	+	Collection c = impl.emptyCollection();
388	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
389	+	int n = rnd.nextInt(6);
390	+	ArrayList copy = new ArrayList();
391	+	for (int i = 0; i < n; i++) {
392	+	Object x = impl.makeElement(i);
393	+	copy.add(x);
394	+	c.add(x);
395	+	}
396	+	ArrayList iterated = new ArrayList();
397	+	ArrayList spliterated = new ArrayList();
398	+	ArrayList removed = new ArrayList();
399	+	Spliterator s = c.spliterator();
400	+	Iterator it = c.iterator();
401	+	if (! (s.hasCharacteristics(Spliterator.CONCURRENT) ||
402	+	s.hasCharacteristics(Spliterator.IMMUTABLE)))
403	+	return;
404	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
405	+	assertTrue(s.tryAdvance(e -> {}));
406	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
407	+	it.next();
408	+	}
409	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
410	+	// TODO: many more removal methods
411	+	if (rnd.nextBoolean()) {
412	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
413	+	Object e = z.next();
414	+	if (rnd.nextBoolean()) {
415	+	try {
416	+	z.remove();
417	+	} catch (UnsupportedOperationException ok) { return; }
418	+	removed.add(e);
419	+	}
420	+	}
421	+	} else {
422	+	Predicate randomlyRemove = e -> {
423	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
424	+	else return false;
425	+	};
426	+	c.removeIf(randomlyRemove);
427	+	}
428	+	s.forEachRemaining(spliterated::add);
429	+	while (it.hasNext())
430	+	iterated.add(it.next());
431	+	assertTrue(copy.containsAll(iterated));
432	+	assertTrue(copy.containsAll(spliterated));
433	+	assertTrue(copy.containsAll(removed));
434	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
435	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
436	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
437	+	iteratedAndRemoved.retainAll(removed);
438	+	spliteratedAndRemoved.retainAll(removed);
439	+	assertTrue(iteratedAndRemoved.size() <= 1);
440	+	assertTrue(spliteratedAndRemoved.size() <= 1);
441	+	if (testImplementationDetails
442	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
443	+	assertTrue(spliteratedAndRemoved.isEmpty());
444	+	}
445	+	}
446	+
447	+	/**
448		* Various ways of traversing a collection yield same elements
449		*/
450		public void testIteratorEquivalence() {

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