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Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.154 by jsr166, Sun Jun 26 19:27:42 2016 UTC vs.
Revision 1.172 by jsr166, Thu Sep 15 00:32:45 2016 UTC

#	Line 32 | Line 32 | import java.util.concurrent.ForkJoinPool
32		import java.util.concurrent.ForkJoinTask;
33		import java.util.concurrent.RejectedExecutionException;
34		import java.util.concurrent.TimeoutException;
35	–	import java.util.concurrent.TimeUnit;
35		import java.util.concurrent.atomic.AtomicInteger;
36		import java.util.concurrent.atomic.AtomicReference;
37		import java.util.function.BiConsumer;
#	Line 362 | Line 361 | public class CompletableFutureTest exten
361		checkCompletedNormally(f, "test");
362		}
363
364	<	abstract class CheckedAction {
364	>	abstract static class CheckedAction {
365		int invocationCount = 0;
366		final ExecutionMode m;
367		CheckedAction(ExecutionMode m) { this.m = m; }
#	Line 374 | Line 373 | public class CompletableFutureTest exten
373		void assertInvoked() { assertEquals(1, invocationCount); }
374		}
375
376	<	abstract class CheckedIntegerAction extends CheckedAction {
376	>	abstract static class CheckedIntegerAction extends CheckedAction {
377		Integer value;
378		CheckedIntegerAction(ExecutionMode m) { super(m); }
379		void assertValue(Integer expected) {
#	Line 383 | Line 382 | public class CompletableFutureTest exten
382		}
383		}
384
385	<	class IntegerSupplier extends CheckedAction
385	>	static class IntegerSupplier extends CheckedAction
386		implements Supplier<Integer>
387		{
388		final Integer value;
#	Line 402 | Line 401 | public class CompletableFutureTest exten
401		return (x == null) ? null : x + 1;
402		}
403
404	<	class NoopConsumer extends CheckedIntegerAction
404	>	static class NoopConsumer extends CheckedIntegerAction
405		implements Consumer<Integer>
406		{
407		NoopConsumer(ExecutionMode m) { super(m); }
#	Line 412 | Line 411 | public class CompletableFutureTest exten
411		}
412		}
413
414	<	class IncFunction extends CheckedIntegerAction
414	>	static class IncFunction extends CheckedIntegerAction
415		implements Function<Integer,Integer>
416		{
417		IncFunction(ExecutionMode m) { super(m); }
#	Line 430 | Line 429 | public class CompletableFutureTest exten
429		- ((y == null) ? 99 : y.intValue());
430		}
431
432	<	class SubtractAction extends CheckedIntegerAction
432	>	static class SubtractAction extends CheckedIntegerAction
433		implements BiConsumer<Integer, Integer>
434		{
435		SubtractAction(ExecutionMode m) { super(m); }
#	Line 440 | Line 439 | public class CompletableFutureTest exten
439		}
440		}
441
442	<	class SubtractFunction extends CheckedIntegerAction
442	>	static class SubtractFunction extends CheckedIntegerAction
443		implements BiFunction<Integer, Integer, Integer>
444		{
445		SubtractFunction(ExecutionMode m) { super(m); }
#	Line 450 | Line 449 | public class CompletableFutureTest exten
449		}
450		}
451
452	<	class Noop extends CheckedAction implements Runnable {
452	>	static class Noop extends CheckedAction implements Runnable {
453		Noop(ExecutionMode m) { super(m); }
454		public void run() {
455		invoked();
456		}
457		}
458
459	<	class FailingSupplier extends CheckedAction
459	>	static class FailingSupplier extends CheckedAction
460		implements Supplier<Integer>
461		{
462		final CFException ex;
#	Line 468 | Line 467 | public class CompletableFutureTest exten
467		}
468		}
469
470	<	class FailingConsumer extends CheckedIntegerAction
470	>	static class FailingConsumer extends CheckedIntegerAction
471		implements Consumer<Integer>
472		{
473		final CFException ex;
#	Line 480 | Line 479 | public class CompletableFutureTest exten
479		}
480		}
481
482	<	class FailingBiConsumer extends CheckedIntegerAction
482	>	static class FailingBiConsumer extends CheckedIntegerAction
483		implements BiConsumer<Integer, Integer>
484		{
485		final CFException ex;
#	Line 492 | Line 491 | public class CompletableFutureTest exten
491		}
492		}
493
494	<	class FailingFunction extends CheckedIntegerAction
494	>	static class FailingFunction extends CheckedIntegerAction
495		implements Function<Integer, Integer>
496		{
497		final CFException ex;
#	Line 504 | Line 503 | public class CompletableFutureTest exten
503		}
504		}
505
506	<	class FailingBiFunction extends CheckedIntegerAction
506	>	static class FailingBiFunction extends CheckedIntegerAction
507		implements BiFunction<Integer, Integer, Integer>
508		{
509		final CFException ex;
#	Line 516 | Line 515 | public class CompletableFutureTest exten
515		}
516		}
517
518	<	class FailingRunnable extends CheckedAction implements Runnable {
518	>	static class FailingRunnable extends CheckedAction implements Runnable {
519		final CFException ex;
520		FailingRunnable(ExecutionMode m) { super(m); ex = new CFException(); }
521		public void run() {
#	Line 525 | Line 524 | public class CompletableFutureTest exten
524		}
525		}
526
527	<	class CompletableFutureInc extends CheckedIntegerAction
527	>	static class CompletableFutureInc extends CheckedIntegerAction
528		implements Function<Integer, CompletableFuture<Integer>>
529		{
530		CompletableFutureInc(ExecutionMode m) { super(m); }
#	Line 538 | Line 537 | public class CompletableFutureTest exten
537		}
538		}
539
540	<	class FailingCompletableFutureFunction extends CheckedIntegerAction
540	>	static class FailingCompletableFutureFunction extends CheckedIntegerAction
541		implements Function<Integer, CompletableFuture<Integer>>
542		{
543		final CFException ex;
#	Line 550 | Line 549 | public class CompletableFutureTest exten
549		}
550		}
551
552	+	static class CountingRejectingExecutor implements Executor {
553	+	final RejectedExecutionException ex = new RejectedExecutionException();
554	+	final AtomicInteger count = new AtomicInteger(0);
555	+	public void execute(Runnable r) {
556	+	count.getAndIncrement();
557	+	throw ex;
558	+	}
559	+	}
560	+
561		// Used for explicit executor tests
562		static final class ThreadExecutor implements Executor {
563		final AtomicInteger count = new AtomicInteger(0);
#	Line 1234 | Line 1242 | public class CompletableFutureTest exten
1242		r.assertInvoked();
1243		}}
1244
1245	+	public void testRunAsync_rejectingExecutor() {
1246	+	CountingRejectingExecutor e = new CountingRejectingExecutor();
1247	+	try {
1248	+	CompletableFuture.runAsync(() -> {}, e);
1249	+	shouldThrow();
1250	+	} catch (Throwable t) {
1251	+	assertSame(e.ex, t);
1252	+	}
1253	+
1254	+	assertEquals(1, e.count.get());
1255	+	}
1256	+
1257		/**
1258		* supplyAsync completes with result of supplier
1259		*/
#	Line 1268 | Line 1288 | public class CompletableFutureTest exten
1288		r.assertInvoked();
1289		}}
1290
1291	+	public void testSupplyAsync_rejectingExecutor() {
1292	+	CountingRejectingExecutor e = new CountingRejectingExecutor();
1293	+	try {
1294	+	CompletableFuture.supplyAsync(() -> null, e);
1295	+	shouldThrow();
1296	+	} catch (Throwable t) {
1297	+	assertSame(e.ex, t);
1298	+	}
1299	+
1300	+	assertEquals(1, e.count.get());
1301	+	}
1302	+
1303		// seq completion methods
1304
1305		/**
#	Line 2667 | Line 2699 | public class CompletableFutureTest exten
2699		for (ExecutionMode m : ExecutionMode.values())
2700		for (Integer v1 : new Integer[] { 1, null })
2701		for (Integer v2 : new Integer[] { 2, null })
2702	+	for (boolean pushNop : new boolean[] { true, false })
2703		{
2704		final CompletableFuture<Integer> f = new CompletableFuture<>();
2705		final CompletableFuture<Integer> g = new CompletableFuture<>();
#	Line 2679 | Line 2712 | public class CompletableFutureTest exten
2712		checkIncomplete(h1);
2713		rs[0].assertNotInvoked();
2714		rs[1].assertNotInvoked();
2715	+	if (pushNop) {          // ad hoc test of intra-completion interference
2716	+	m.thenRun(f, () -> {});
2717	+	m.thenRun(g, () -> {});
2718	+	}
2719		f.complete(v1);
2720		checkCompletedNormally(h0, null);
2721		checkCompletedNormally(h1, null);
#	Line 3317 | Line 3354 | public class CompletableFutureTest exten
3354		assertEquals(0, exec.count.get());
3355		}
3356
3320	–	static class CountingRejectingExecutor implements Executor {
3321	–	final RejectedExecutionException ex = new RejectedExecutionException();
3322	–	final AtomicInteger count = new AtomicInteger(0);
3323	–	public void execute(Runnable r) {
3324	–	count.getAndIncrement();
3325	–	throw ex;
3326	–	}
3327	–	}
3328	–
3357		/**
3358		* Test submissions to an executor that rejects all tasks.
3359		*/
3360		public void testRejectingExecutor() {
3361	<	for (Integer v : new Integer[] { 1, null }) {
3362	<
3361	>	for (Integer v : new Integer[] { 1, null })
3362	>	{
3363		final CountingRejectingExecutor e = new CountingRejectingExecutor();
3364
3365		final CompletableFuture<Integer> complete = CompletableFuture.completedFuture(v);
#	Line 3410 | Line 3438 | public class CompletableFutureTest exten
3438		checkCompletedWithWrappedException(future, e.ex);
3439
3440		assertEquals(futures.size(), e.count.get());
3441	<
3414	<	}
3415	<	}
3441	>	}}
3442
3443		/**
3444		* Test submissions to an executor that rejects all tasks, but
#	Line 3420 | Line 3446 | public class CompletableFutureTest exten
3446		* explicitly completed.
3447		*/
3448		public void testRejectingExecutorNeverInvoked() {
3449	+	for (Integer v : new Integer[] { 1, null })
3450	+	{
3451		final CountingRejectingExecutor e = new CountingRejectingExecutor();
3452
3425	–	for (Integer v : new Integer[] { 1, null }) {
3426	–
3453		final CompletableFuture<Integer> complete = CompletableFuture.completedFuture(v);
3454		final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
3455
#	Line 3471 | Line 3497 | public class CompletableFutureTest exten
3497		checkCompletedNormally(future, null);
3498
3499		assertEquals(0, e.count.get());
3500	<
3475	<	}
3476	<	}
3500	>	}}
3501
3502		/**
3503		* toCompletableFuture returns this CompletableFuture.
#	Line 3827 | Line 3851 | public class CompletableFutureTest exten
3851		final CompletableFuture<Integer> v42 = CompletableFuture.completedFuture(42);
3852		final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
3853
3854	+	final Runnable noopRunnable = new Noop(m);
3855	+	final Consumer<Integer> noopConsumer = new NoopConsumer(m);
3856	+	final Function<Integer, Integer> incFunction = new IncFunction(m);
3857	+
3858		List<Function<CompletableFuture<Integer>, CompletableFuture<?>>> funs
3859		= new ArrayList<>();
3860
3861	<	funs.add((y) -> m.thenRun(y, new Noop(m)));
3862	<	funs.add((y) -> m.thenAccept(y, new NoopConsumer(m)));
3863	<	funs.add((y) -> m.thenApply(y, new IncFunction(m)));
3864	<
3865	<	funs.add((y) -> m.runAfterEither(y, incomplete, new Noop(m)));
3866	<	funs.add((y) -> m.acceptEither(y, incomplete, new NoopConsumer(m)));
3867	<	funs.add((y) -> m.applyToEither(y, incomplete, new IncFunction(m)));
3861	>	funs.add((y) -> m.thenRun(y, noopRunnable));
3862	>	funs.add((y) -> m.thenAccept(y, noopConsumer));
3863	>	funs.add((y) -> m.thenApply(y, incFunction));
3864	>
3865	>	funs.add((y) -> m.runAfterEither(y, incomplete, noopRunnable));
3866	>	funs.add((y) -> m.acceptEither(y, incomplete, noopConsumer));
3867	>	funs.add((y) -> m.applyToEither(y, incomplete, incFunction));
3868
3869	<	funs.add((y) -> m.runAfterBoth(y, v42, new Noop(m)));
3870	<	funs.add((y) -> m.runAfterBoth(v42, y, new Noop(m)));
3869	>	funs.add((y) -> m.runAfterBoth(y, v42, noopRunnable));
3870	>	funs.add((y) -> m.runAfterBoth(v42, y, noopRunnable));
3871		funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3872		funs.add((y) -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3873		funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
#	Line 3849 | Line 3877 | public class CompletableFutureTest exten
3877
3878		funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3879
3880	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {y}));
3881	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {y, v42}));
3882	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {v42, y}));
3883	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {y}));
3884	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {y, incomplete}));
3885	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {incomplete, y}));
3880	>	funs.add((y) -> CompletableFuture.allOf(y));
3881	>	funs.add((y) -> CompletableFuture.allOf(y, v42));
3882	>	funs.add((y) -> CompletableFuture.allOf(v42, y));
3883	>	funs.add((y) -> CompletableFuture.anyOf(y));
3884	>	funs.add((y) -> CompletableFuture.anyOf(y, incomplete));
3885	>	funs.add((y) -> CompletableFuture.anyOf(incomplete, y));
3886
3887		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3888		fun : funs) {
3889		CompletableFuture<Integer> f = new CompletableFuture<>();
3890		f.completeExceptionally(ex);
3891	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3891	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3892		checkCompletedWithWrappedException(src, ex);
3893		CompletableFuture<?> dep = fun.apply(src);
3894		checkCompletedWithWrappedException(dep, ex);
#	Line 3870 | Line 3898 | public class CompletableFutureTest exten
3898		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3899		fun : funs) {
3900		CompletableFuture<Integer> f = new CompletableFuture<>();
3901	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3901	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3902		CompletableFuture<?> dep = fun.apply(src);
3903		f.completeExceptionally(ex);
3904		checkCompletedWithWrappedException(src, ex);
#	Line 3884 | Line 3912 | public class CompletableFutureTest exten
3912		CompletableFuture<Integer> f = new CompletableFuture<>();
3913		f.cancel(mayInterruptIfRunning);
3914		checkCancelled(f);
3915	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3915	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3916		checkCompletedWithWrappedCancellationException(src);
3917		CompletableFuture<?> dep = fun.apply(src);
3918		checkCompletedWithWrappedCancellationException(dep);
#	Line 3895 | Line 3923 | public class CompletableFutureTest exten
3923		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3924		fun : funs) {
3925		CompletableFuture<Integer> f = new CompletableFuture<>();
3926	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3926	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3927		CompletableFuture<?> dep = fun.apply(src);
3928		f.cancel(mayInterruptIfRunning);
3929		checkCancelled(f);
#	Line 3906 | Line 3934 | public class CompletableFutureTest exten
3934		}}
3935
3936		/**
3937	<	* Minimal completion stages throw UOE for all non-CompletionStage methods
3937	>	* Minimal completion stages throw UOE for most non-CompletionStage methods
3938		*/
3939		public void testMinimalCompletionStage_minimality() {
3940		if (!testImplementationDetails) return;
#	Line 3935 | Line 3963 | public class CompletableFutureTest exten
3963		.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3964		.collect(Collectors.toList());
3965
3966	<	CompletionStage<Integer> minimalStage =
3967	<	new CompletableFuture<Integer>().minimalCompletionStage();
3966	>	List<CompletionStage<Integer>> stages = new ArrayList<>();
3967	>	stages.add(new CompletableFuture<Integer>().minimalCompletionStage());
3968	>	stages.add(CompletableFuture.completedStage(1));
3969	>	stages.add(CompletableFuture.failedStage(new CFException()));
3970
3971		List<Method> bugs = new ArrayList<>();
3972		for (Method method : allMethods) {
#	Line 3952 | Line 3982 | public class CompletableFutureTest exten
3982		else if (parameterTypes[i] == long.class)
3983		args[i] = 0L;
3984		}
3985	<	try {
3986	<	method.invoke(minimalStage, args);
3987	<	bugs.add(method);
3958	<	}
3959	<	catch (java.lang.reflect.InvocationTargetException expected) {
3960	<	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
3985	>	for (CompletionStage<Integer> stage : stages) {
3986	>	try {
3987	>	method.invoke(stage, args);
3988		bugs.add(method);
3962	–	// expected.getCause().printStackTrace();
3989		}
3990	+	catch (java.lang.reflect.InvocationTargetException expected) {
3991	+	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
3992	+	bugs.add(method);
3993	+	// expected.getCause().printStackTrace();
3994	+	}
3995	+	}
3996	+	catch (ReflectiveOperationException bad) { throw new Error(bad); }
3997		}
3965	–	catch (ReflectiveOperationException bad) { throw new Error(bad); }
3998		}
3999		if (!bugs.isEmpty())
4000	<	throw new Error("Methods did not throw UOE: " + bugs.toString());
4000	>	throw new Error("Methods did not throw UOE: " + bugs);
4001		}
4002
4003		static class Monad {
#	Line 4114 | Line 4146 | public class CompletableFutureTest exten
4146		Monad.plus(godot, Monad.unit(5L)));
4147		}
4148
4149	+	/** Test long recursive chains of CompletableFutures with cascading completions */
4150	+	public void testRecursiveChains() throws Throwable {
4151	+	for (ExecutionMode m : ExecutionMode.values())
4152	+	for (boolean addDeadEnds : new boolean[] { true, false })
4153	+	{
4154	+	final int val = 42;
4155	+	final int n = expensiveTests ? 1_000 : 2;
4156	+	CompletableFuture<Integer> head = new CompletableFuture<>();
4157	+	CompletableFuture<Integer> tail = head;
4158	+	for (int i = 0; i < n; i++) {
4159	+	if (addDeadEnds) m.thenApply(tail, v -> v + 1);
4160	+	tail = m.thenApply(tail, v -> v + 1);
4161	+	if (addDeadEnds) m.applyToEither(tail, tail, v -> v + 1);
4162	+	tail = m.applyToEither(tail, tail, v -> v + 1);
4163	+	if (addDeadEnds) m.thenCombine(tail, tail, (v, w) -> v + 1);
4164	+	tail = m.thenCombine(tail, tail, (v, w) -> v + 1);
4165	+	}
4166	+	head.complete(val);
4167	+	assertEquals(val + 3 * n, (int) tail.join());
4168	+	}}
4169	+
4170		/**
4171		* A single CompletableFuture with many dependents.
4172		* A demo of scalability - runtime is O(n).
4173		*/
4174		public void testManyDependents() throws Throwable {
4175	<	final int n = 1_000;
4175	>	final int n = expensiveTests ? 1_000_000 : 10;
4176		final CompletableFuture<Void> head = new CompletableFuture<>();
4177		final CompletableFuture<Void> complete = CompletableFuture.completedFuture((Void)null);
4178		final AtomicInteger count = new AtomicInteger(0);
#	Line 4146 | Line 4199 | public class CompletableFutureTest exten
4199		assertEquals(5 * 3 * n, count.get());
4200		}
4201
4202	+	/** ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest tck */
4203	+	public void testCoCompletionGarbageRetention() throws Throwable {
4204	+	final int n = expensiveTests ? 1_000_000 : 10;
4205	+	final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
4206	+	CompletableFuture<Integer> f;
4207	+	for (int i = 0; i < n; i++) {
4208	+	f = new CompletableFuture<>();
4209	+	f.runAfterEither(incomplete, () -> {});
4210	+	f.complete(null);
4211	+
4212	+	f = new CompletableFuture<>();
4213	+	f.acceptEither(incomplete, (x) -> {});
4214	+	f.complete(null);
4215	+
4216	+	f = new CompletableFuture<>();
4217	+	f.applyToEither(incomplete, (x) -> x);
4218	+	f.complete(null);
4219	+
4220	+	f = new CompletableFuture<>();
4221	+	CompletableFuture.anyOf(new CompletableFuture<?>[] { f, incomplete });
4222	+	f.complete(null);
4223	+	}
4224	+
4225	+	for (int i = 0; i < n; i++) {
4226	+	f = new CompletableFuture<>();
4227	+	incomplete.runAfterEither(f, () -> {});
4228	+	f.complete(null);
4229	+
4230	+	f = new CompletableFuture<>();
4231	+	incomplete.acceptEither(f, (x) -> {});
4232	+	f.complete(null);
4233	+
4234	+	f = new CompletableFuture<>();
4235	+	incomplete.applyToEither(f, (x) -> x);
4236	+	f.complete(null);
4237	+
4238	+	f = new CompletableFuture<>();
4239	+	CompletableFuture.anyOf(new CompletableFuture<?>[] { incomplete, f });
4240	+	f.complete(null);
4241	+	}
4242	+	}
4243	+
4244	+	/**
4245	+	* Reproduction recipe for:
4246	+	* 8160402: Garbage retention with CompletableFuture.anyOf
4247	+	* cvs update -D '2016-05-01' ./src/main/java/util/concurrent/CompletableFuture.java && ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testAnyOfGarbageRetention tck; cvs update -A
4248	+	*/
4249	+	public void testAnyOfGarbageRetention() throws Throwable {
4250	+	for (Integer v : new Integer[] { 1, null })
4251	+	{
4252	+	final int n = expensiveTests ? 100_000 : 10;
4253	+	CompletableFuture<Integer>[] fs
4254	+	= (CompletableFuture<Integer>[]) new CompletableFuture<?>[100];
4255	+	for (int i = 0; i < fs.length; i++)
4256	+	fs[i] = new CompletableFuture<>();
4257	+	fs[fs.length - 1].complete(v);
4258	+	for (int i = 0; i < n; i++)
4259	+	checkCompletedNormally(CompletableFuture.anyOf(fs), v);
4260	+	}}
4261	+
4262	+	/**
4263	+	* Checks for garbage retention with allOf.
4264	+	*
4265	+	* As of 2016-07, fails with OOME:
4266	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testCancelledAllOfGarbageRetention tck
4267	+	*/
4268	+	public void testCancelledAllOfGarbageRetention() throws Throwable {
4269	+	final int n = expensiveTests ? 100_000 : 10;
4270	+	CompletableFuture<Integer>[] fs
4271	+	= (CompletableFuture<Integer>[]) new CompletableFuture<?>[100];
4272	+	for (int i = 0; i < fs.length; i++)
4273	+	fs[i] = new CompletableFuture<>();
4274	+	for (int i = 0; i < n; i++)
4275	+	assertTrue(CompletableFuture.allOf(fs).cancel(false));
4276	+	}
4277	+
4278	+	/**
4279	+	* Checks for garbage retention when a dependent future is
4280	+	* cancelled and garbage-collected.
4281	+	* 8161600: Garbage retention when source CompletableFutures are never completed
4282	+	*
4283	+	* As of 2016-07, fails with OOME:
4284	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testCancelledGarbageRetention tck
4285	+	*/
4286	+	public void testCancelledGarbageRetention() throws Throwable {
4287	+	final int n = expensiveTests ? 100_000 : 10;
4288	+	CompletableFuture<Integer> neverCompleted = new CompletableFuture<>();
4289	+	for (int i = 0; i < n; i++)
4290	+	assertTrue(neverCompleted.thenRun(() -> {}).cancel(true));
4291	+	}
4292	+
4293		//     static <U> U join(CompletionStage<U> stage) {
4294		//         CompletableFuture<U> f = new CompletableFuture<>();
4295		//         stage.whenComplete((v, ex) -> {

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