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Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.178 by jsr166, Wed Sep 21 19:02:50 2016 UTC vs.
Revision 1.187 by jsr166, Mon Jul 3 21:18:37 2017 UTC

#	Line 64 | Line 64 | public class CompletableFutureTest exten
64		assertNull(f.getNow(null));
65		} catch (Throwable fail) { threadUnexpectedException(fail); }
66		try {
67	<	f.get(0L, SECONDS);
67	>	f.get(randomExpiredTimeout(), randomTimeUnit());
68		shouldThrow();
69		}
70		catch (TimeoutException success) {}
#	Line 76 | Line 76 | public class CompletableFutureTest exten
76
77		try {
78		assertEquals(value, f.join());
79	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
80	–	try {
79		assertEquals(value, f.getNow(null));
82	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
83	–	try {
80		assertEquals(value, f.get());
81		} catch (Throwable fail) { threadUnexpectedException(fail); }
82		assertTrue(f.isDone());
#	Line 93 | Line 89 | public class CompletableFutureTest exten
89		* Returns the "raw" internal exceptional completion of f,
90		* without any additional wrapping with CompletionException.
91		*/
92	<	<U> Throwable exceptionalCompletion(CompletableFuture<U> f) {
93	<	// handle (and whenComplete) can distinguish between "direct"
94	<	// and "wrapped" exceptional completion
95	<	return f.handle((U u, Throwable t) -> t).join();
92	>	Throwable exceptionalCompletion(CompletableFuture<?> f) {
93	>	// handle (and whenComplete and exceptionally) can distinguish
94	>	// between "direct" and "wrapped" exceptional completion
95	>	return f.handle((u, t) -> t).join();
96		}
97
98		void checkCompletedExceptionally(CompletableFuture<?> f,
#	Line 147 | Line 143 | public class CompletableFutureTest exten
143
144		void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
145		checkCompletedExceptionally(f, true,
146	<	(t) -> assertTrue(t instanceof CFException));
146	>	t -> assertTrue(t instanceof CFException));
147		}
148
149		void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
150		checkCompletedExceptionally(f, true,
151	<	(t) -> assertTrue(t instanceof CancellationException));
151	>	t -> assertTrue(t instanceof CancellationException));
152		}
153
154		void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
155		checkCompletedExceptionally(f, false,
156	<	(t) -> assertTrue(t instanceof TimeoutException));
156	>	t -> assertTrue(t instanceof TimeoutException));
157		}
158
159		void checkCompletedWithWrappedException(CompletableFuture<?> f,
160		Throwable ex) {
161	<	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
161	>	checkCompletedExceptionally(f, true, t -> assertSame(t, ex));
162		}
163
164		void checkCompletedExceptionally(CompletableFuture<?> f, Throwable ex) {
165	<	checkCompletedExceptionally(f, false, (t) -> assertSame(t, ex));
165	>	checkCompletedExceptionally(f, false, t -> assertSame(t, ex));
166		}
167
168		void checkCancelled(CompletableFuture<?> f) {
#	Line 1242 | Line 1238 | public class CompletableFutureTest exten
1238		r.assertInvoked();
1239		}}
1240
1241	+	@SuppressWarnings("FutureReturnValueIgnored")
1242		public void testRunAsync_rejectingExecutor() {
1243		CountingRejectingExecutor e = new CountingRejectingExecutor();
1244		try {
#	Line 1288 | Line 1285 | public class CompletableFutureTest exten
1285		r.assertInvoked();
1286		}}
1287
1288	+	@SuppressWarnings("FutureReturnValueIgnored")
1289		public void testSupplyAsync_rejectingExecutor() {
1290		CountingRejectingExecutor e = new CountingRejectingExecutor();
1291		try {
#	Line 2562 | Line 2560 | public class CompletableFutureTest exten
2560
2561		// unspecified behavior - both source completions available
2562		try {
2563	<	assertEquals(null, h0.join());
2563	>	assertNull(h0.join());
2564		rs[0].assertValue(v1);
2565		} catch (CompletionException ok) {
2566		checkCompletedWithWrappedException(h0, ex);
2567		rs[0].assertNotInvoked();
2568		}
2569		try {
2570	<	assertEquals(null, h1.join());
2570	>	assertNull(h1.join());
2571		rs[1].assertValue(v1);
2572		} catch (CompletionException ok) {
2573		checkCompletedWithWrappedException(h1, ex);
2574		rs[1].assertNotInvoked();
2575		}
2576		try {
2577	<	assertEquals(null, h2.join());
2577	>	assertNull(h2.join());
2578		rs[2].assertValue(v1);
2579		} catch (CompletionException ok) {
2580		checkCompletedWithWrappedException(h2, ex);
2581		rs[2].assertNotInvoked();
2582		}
2583		try {
2584	<	assertEquals(null, h3.join());
2584	>	assertNull(h3.join());
2585		rs[3].assertValue(v1);
2586		} catch (CompletionException ok) {
2587		checkCompletedWithWrappedException(h3, ex);
#	Line 2822 | Line 2820 | public class CompletableFutureTest exten
2820
2821		// unspecified behavior - both source completions available
2822		try {
2823	<	assertEquals(null, h0.join());
2823	>	assertNull(h0.join());
2824		rs[0].assertInvoked();
2825		} catch (CompletionException ok) {
2826		checkCompletedWithWrappedException(h0, ex);
2827		rs[0].assertNotInvoked();
2828		}
2829		try {
2830	<	assertEquals(null, h1.join());
2830	>	assertNull(h1.join());
2831		rs[1].assertInvoked();
2832		} catch (CompletionException ok) {
2833		checkCompletedWithWrappedException(h1, ex);
2834		rs[1].assertNotInvoked();
2835		}
2836		try {
2837	<	assertEquals(null, h2.join());
2837	>	assertNull(h2.join());
2838		rs[2].assertInvoked();
2839		} catch (CompletionException ok) {
2840		checkCompletedWithWrappedException(h2, ex);
2841		rs[2].assertNotInvoked();
2842		}
2843		try {
2844	<	assertEquals(null, h3.join());
2844	>	assertNull(h3.join());
2845		rs[3].assertInvoked();
2846		} catch (CompletionException ok) {
2847		checkCompletedWithWrappedException(h3, ex);
#	Line 3238 | Line 3236 | public class CompletableFutureTest exten
3236		/**
3237		* Completion methods throw NullPointerException with null arguments
3238		*/
3239	+	@SuppressWarnings("FutureReturnValueIgnored")
3240		public void testNPE() {
3241		CompletableFuture<Integer> f = new CompletableFuture<>();
3242		CompletableFuture<Integer> g = new CompletableFuture<>();
#	Line 3257 | Line 3256 | public class CompletableFutureTest exten
3256
3257		() -> f.thenApply(null),
3258		() -> f.thenApplyAsync(null),
3259	<	() -> f.thenApplyAsync((x) -> x, null),
3259	>	() -> f.thenApplyAsync(x -> x, null),
3260		() -> f.thenApplyAsync(null, exec),
3261
3262		() -> f.thenAccept(null),
3263		() -> f.thenAcceptAsync(null),
3264	<	() -> f.thenAcceptAsync((x) -> {} , null),
3264	>	() -> f.thenAcceptAsync(x -> {} , null),
3265		() -> f.thenAcceptAsync(null, exec),
3266
3267		() -> f.thenRun(null),
#	Line 3297 | Line 3296 | public class CompletableFutureTest exten
3296		() -> f.applyToEither(g, null),
3297		() -> f.applyToEitherAsync(g, null),
3298		() -> f.applyToEitherAsync(g, null, exec),
3299	<	() -> f.applyToEither(nullFuture, (x) -> x),
3300	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x),
3301	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x, exec),
3302	<	() -> f.applyToEitherAsync(g, (x) -> x, null),
3299	>	() -> f.applyToEither(nullFuture, x -> x),
3300	>	() -> f.applyToEitherAsync(nullFuture, x -> x),
3301	>	() -> f.applyToEitherAsync(nullFuture, x -> x, exec),
3302	>	() -> f.applyToEitherAsync(g, x -> x, null),
3303
3304		() -> f.acceptEither(g, null),
3305		() -> f.acceptEitherAsync(g, null),
3306		() -> f.acceptEitherAsync(g, null, exec),
3307	<	() -> f.acceptEither(nullFuture, (x) -> {}),
3308	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}),
3309	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}, exec),
3310	<	() -> f.acceptEitherAsync(g, (x) -> {}, null),
3307	>	() -> f.acceptEither(nullFuture, x -> {}),
3308	>	() -> f.acceptEitherAsync(nullFuture, x -> {}),
3309	>	() -> f.acceptEitherAsync(nullFuture, x -> {}, exec),
3310	>	() -> f.acceptEitherAsync(g, x -> {}, null),
3311
3312		() -> f.runAfterEither(g, null),
3313		() -> f.runAfterEitherAsync(g, null),
#	Line 3374 | Line 3373 | public class CompletableFutureTest exten
3373		for (CompletableFuture<Integer> src : srcs) {
3374		List<CompletableFuture<?>> fs = new ArrayList<>();
3375		fs.add(src.thenRunAsync(() -> {}, e));
3376	<	fs.add(src.thenAcceptAsync((z) -> {}, e));
3377	<	fs.add(src.thenApplyAsync((z) -> z, e));
3376	>	fs.add(src.thenAcceptAsync(z -> {}, e));
3377	>	fs.add(src.thenApplyAsync(z -> z, e));
3378
3379		fs.add(src.thenCombineAsync(src, (x, y) -> x, e));
3380		fs.add(src.thenAcceptBothAsync(src, (x, y) -> {}, e));
3381		fs.add(src.runAfterBothAsync(src, () -> {}, e));
3382
3383	<	fs.add(src.applyToEitherAsync(src, (z) -> z, e));
3384	<	fs.add(src.acceptEitherAsync(src, (z) -> {}, e));
3383	>	fs.add(src.applyToEitherAsync(src, z -> z, e));
3384	>	fs.add(src.acceptEitherAsync(src, z -> {}, e));
3385		fs.add(src.runAfterEitherAsync(src, () -> {}, e));
3386
3387	<	fs.add(src.thenComposeAsync((z) -> null, e));
3387	>	fs.add(src.thenComposeAsync(z -> null, e));
3388		fs.add(src.whenCompleteAsync((z, t) -> {}, e));
3389		fs.add(src.handleAsync((z, t) -> null, e));
3390
#	Line 3418 | Line 3417 | public class CompletableFutureTest exten
3417		{
3418		List<CompletableFuture<?>> fs = new ArrayList<>();
3419
3420	<	fs.add(complete.applyToEitherAsync(incomplete, (z) -> z, e));
3421	<	fs.add(incomplete.applyToEitherAsync(complete, (z) -> z, e));
3420	>	fs.add(complete.applyToEitherAsync(incomplete, z -> z, e));
3421	>	fs.add(incomplete.applyToEitherAsync(complete, z -> z, e));
3422
3423	<	fs.add(complete.acceptEitherAsync(incomplete, (z) -> {}, e));
3424	<	fs.add(incomplete.acceptEitherAsync(complete, (z) -> {}, e));
3423	>	fs.add(complete.acceptEitherAsync(incomplete, z -> {}, e));
3424	>	fs.add(incomplete.acceptEitherAsync(complete, z -> {}, e));
3425
3426		fs.add(complete.runAfterEitherAsync(incomplete, () -> {}, e));
3427		fs.add(incomplete.runAfterEitherAsync(complete, () -> {}, e));
#	Line 3461 | Line 3460 | public class CompletableFutureTest exten
3460
3461		List<CompletableFuture<?>> fs = new ArrayList<>();
3462		fs.add(incomplete.thenRunAsync(() -> {}, e));
3463	<	fs.add(incomplete.thenAcceptAsync((z) -> {}, e));
3464	<	fs.add(incomplete.thenApplyAsync((z) -> z, e));
3463	>	fs.add(incomplete.thenAcceptAsync(z -> {}, e));
3464	>	fs.add(incomplete.thenApplyAsync(z -> z, e));
3465
3466		fs.add(incomplete.thenCombineAsync(incomplete, (x, y) -> x, e));
3467		fs.add(incomplete.thenAcceptBothAsync(incomplete, (x, y) -> {}, e));
3468		fs.add(incomplete.runAfterBothAsync(incomplete, () -> {}, e));
3469
3470	<	fs.add(incomplete.applyToEitherAsync(incomplete, (z) -> z, e));
3471	<	fs.add(incomplete.acceptEitherAsync(incomplete, (z) -> {}, e));
3470	>	fs.add(incomplete.applyToEitherAsync(incomplete, z -> z, e));
3471	>	fs.add(incomplete.acceptEitherAsync(incomplete, z -> {}, e));
3472		fs.add(incomplete.runAfterEitherAsync(incomplete, () -> {}, e));
3473
3474	<	fs.add(incomplete.thenComposeAsync((z) -> null, e));
3474	>	fs.add(incomplete.thenComposeAsync(z -> null, e));
3475		fs.add(incomplete.whenCompleteAsync((z, t) -> {}, e));
3476		fs.add(incomplete.handleAsync((z, t) -> null, e));
3477
#	Line 3532 | Line 3531 | public class CompletableFutureTest exten
3531		*/
3532		public void testCompletedStage() {
3533		AtomicInteger x = new AtomicInteger(0);
3534	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3534	>	AtomicReference<Throwable> r = new AtomicReference<>();
3535		CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3536		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3537		assertEquals(x.get(), 1);
#	Line 3634 | Line 3633 | public class CompletableFutureTest exten
3633		CompletableFuture<Integer> f = new CompletableFuture<>();
3634		CompletionStage<Integer> g = f.minimalCompletionStage();
3635		AtomicInteger x = new AtomicInteger(0);
3636	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3636	>	AtomicReference<Throwable> r = new AtomicReference<>();
3637		checkIncomplete(f);
3638		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3639		f.complete(1);
#	Line 3651 | Line 3650 | public class CompletableFutureTest exten
3650		CompletableFuture<Integer> f = new CompletableFuture<>();
3651		CompletionStage<Integer> g = f.minimalCompletionStage();
3652		AtomicInteger x = new AtomicInteger(0);
3653	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3653	>	AtomicReference<Throwable> r = new AtomicReference<>();
3654		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3655		checkIncomplete(f);
3656		CFException ex = new CFException();
#	Line 3669 | Line 3668 | public class CompletableFutureTest exten
3668		CFException ex = new CFException();
3669		CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3670		AtomicInteger x = new AtomicInteger(0);
3671	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3671	>	AtomicReference<Throwable> r = new AtomicReference<>();
3672		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3673		assertEquals(x.get(), 0);
3674		assertEquals(r.get(), ex);
#	Line 3693 | Line 3692 | public class CompletableFutureTest exten
3692		public void testCompleteAsync2() {
3693		CompletableFuture<Integer> f = new CompletableFuture<>();
3694		CFException ex = new CFException();
3695	<	f.completeAsync(() -> {if (true) throw ex; return 1;});
3695	>	f.completeAsync(() -> { throw ex; });
3696		try {
3697		f.join();
3698		shouldThrow();
#	Line 3723 | Line 3722 | public class CompletableFutureTest exten
3722		CompletableFuture<Integer> f = new CompletableFuture<>();
3723		CFException ex = new CFException();
3724		ThreadExecutor executor = new ThreadExecutor();
3725	<	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3725	>	f.completeAsync(() -> { throw ex; }, executor);
3726		try {
3727		f.join();
3728		shouldThrow();
#	Line 3882 | Line 3881 | public class CompletableFutureTest exten
3881		List<Function<CompletableFuture<Integer>, CompletableFuture<?>>> funs
3882		= new ArrayList<>();
3883
3884	<	funs.add((y) -> m.thenRun(y, noopRunnable));
3885	<	funs.add((y) -> m.thenAccept(y, noopConsumer));
3886	<	funs.add((y) -> m.thenApply(y, incFunction));
3887	<
3888	<	funs.add((y) -> m.runAfterEither(y, incomplete, noopRunnable));
3889	<	funs.add((y) -> m.acceptEither(y, incomplete, noopConsumer));
3890	<	funs.add((y) -> m.applyToEither(y, incomplete, incFunction));
3891	<
3892	<	funs.add((y) -> m.runAfterBoth(y, v42, noopRunnable));
3893	<	funs.add((y) -> m.runAfterBoth(v42, y, noopRunnable));
3894	<	funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3895	<	funs.add((y) -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3896	<	funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
3897	<	funs.add((y) -> m.thenCombine(v42, y, new SubtractFunction(m)));
3898	<
3899	<	funs.add((y) -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3900	<
3901	<	funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3902	<
3903	<	funs.add((y) -> CompletableFuture.allOf(y));
3904	<	funs.add((y) -> CompletableFuture.allOf(y, v42));
3905	<	funs.add((y) -> CompletableFuture.allOf(v42, y));
3906	<	funs.add((y) -> CompletableFuture.anyOf(y));
3907	<	funs.add((y) -> CompletableFuture.anyOf(y, incomplete));
3908	<	funs.add((y) -> CompletableFuture.anyOf(incomplete, y));
3884	>	funs.add(y -> m.thenRun(y, noopRunnable));
3885	>	funs.add(y -> m.thenAccept(y, noopConsumer));
3886	>	funs.add(y -> m.thenApply(y, incFunction));
3887	>
3888	>	funs.add(y -> m.runAfterEither(y, incomplete, noopRunnable));
3889	>	funs.add(y -> m.acceptEither(y, incomplete, noopConsumer));
3890	>	funs.add(y -> m.applyToEither(y, incomplete, incFunction));
3891	>
3892	>	funs.add(y -> m.runAfterBoth(y, v42, noopRunnable));
3893	>	funs.add(y -> m.runAfterBoth(v42, y, noopRunnable));
3894	>	funs.add(y -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3895	>	funs.add(y -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3896	>	funs.add(y -> m.thenCombine(y, v42, new SubtractFunction(m)));
3897	>	funs.add(y -> m.thenCombine(v42, y, new SubtractFunction(m)));
3898	>
3899	>	funs.add(y -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3900	>
3901	>	funs.add(y -> m.thenCompose(y, new CompletableFutureInc(m)));
3902	>
3903	>	funs.add(y -> CompletableFuture.allOf(y));
3904	>	funs.add(y -> CompletableFuture.allOf(y, v42));
3905	>	funs.add(y -> CompletableFuture.allOf(v42, y));
3906	>	funs.add(y -> CompletableFuture.anyOf(y));
3907	>	funs.add(y -> CompletableFuture.anyOf(y, incomplete));
3908	>	funs.add(y -> CompletableFuture.anyOf(incomplete, y));
3909
3910		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3911		fun : funs) {
#	Line 3963 | Line 3962 | public class CompletableFutureTest exten
3962		public void testMinimalCompletionStage_minimality() {
3963		if (!testImplementationDetails) return;
3964		Function<Method, String> toSignature =
3965	<	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3965	>	method -> method.getName() + Arrays.toString(method.getParameterTypes());
3966		Predicate<Method> isNotStatic =
3967	<	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3967	>	method -> (method.getModifiers() & Modifier.STATIC) == 0;
3968		List<Method> minimalMethods =
3969		Stream.of(Object.class, CompletionStage.class)
3970	<	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3970	>	.flatMap(klazz -> Stream.of(klazz.getMethods()))
3971		.filter(isNotStatic)
3972		.collect(Collectors.toList());
3973		// Methods from CompletableFuture permitted NOT to throw UOE
#	Line 3984 | Line 3983 | public class CompletableFutureTest exten
3983		.collect(Collectors.toSet());
3984		List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
3985		.filter(isNotStatic)
3986	<	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3986	>	.filter(method -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3987		.collect(Collectors.toList());
3988
3989		List<CompletionStage<Integer>> stages = new ArrayList<>();
#	Line 4144 | Line 4143 | public class CompletableFutureTest exten
4143		CompletionStage<Integer> minimal = f.minimalCompletionStage();
4144		CompletableFuture<Integer> g = new CompletableFuture<>();
4145		if (!createIncomplete) assertTrue(f.complete(v1));
4146	<	minimal.thenAccept((x) -> g.complete(x));
4146	>	minimal.thenAccept(x -> g.complete(x));
4147		if (createIncomplete) assertTrue(f.complete(v1));
4148		g.join();
4149		checkCompletedNormally(g, v1);
#	Line 4168 | Line 4167 | public class CompletableFutureTest exten
4167		static <T,U,V> Function<T, CompletableFuture<V>> compose
4168		(Function<T, CompletableFuture<U>> f,
4169		Function<U, CompletableFuture<V>> g) {
4170	<	return (x) -> f.apply(x).thenCompose(g);
4170	>	return x -> f.apply(x).thenCompose(g);
4171		}
4172
4173		static void assertZero(CompletableFuture<?> f) {
#	Line 4248 | Line 4247 | public class CompletableFutureTest exten
4247
4248		// Some mutually non-commutative functions
4249		Function<Long, CompletableFuture<Long>> triple
4250	<	= (x) -> Monad.unit(3 * x);
4250	>	= x -> Monad.unit(3 * x);
4251		Function<Long, CompletableFuture<Long>> inc
4252	<	= (x) -> Monad.unit(x + 1);
4252	>	= x -> Monad.unit(x + 1);
4253
4254		// unit is a right identity: m >>= unit === m
4255		Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
#	Line 4262 | Line 4261 | public class CompletableFutureTest exten
4261		// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
4262		Monad.assertFutureEquals(
4263		unit.apply(5L).thenCompose(inc).thenCompose(triple),
4264	<	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
4264	>	unit.apply(5L).thenCompose(x -> inc.apply(x).thenCompose(triple)));
4265
4266		// The case for CompletableFuture as an additive monad is weaker...
4267
#	Line 4272 | Line 4271 | public class CompletableFutureTest exten
4271		// left zero: zero >>= f === zero
4272		Monad.assertZero(zero.thenCompose(inc));
4273		// right zero: f >>= (\x -> zero) === zero
4274	<	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
4274	>	Monad.assertZero(inc.apply(5L).thenCompose(x -> zero));
4275
4276		// f plus zero === f
4277		Monad.assertFutureEquals(Monad.unit(5L),
#	Line 4299 | Line 4298 | public class CompletableFutureTest exten
4298		}
4299
4300		/** Test long recursive chains of CompletableFutures with cascading completions */
4301	+	@SuppressWarnings("FutureReturnValueIgnored")
4302		public void testRecursiveChains() throws Throwable {
4303		for (ExecutionMode m : ExecutionMode.values())
4304		for (boolean addDeadEnds : new boolean[] { true, false })
#	Line 4323 | Line 4323 | public class CompletableFutureTest exten
4323		* A single CompletableFuture with many dependents.
4324		* A demo of scalability - runtime is O(n).
4325		*/
4326	+	@SuppressWarnings("FutureReturnValueIgnored")
4327		public void testManyDependents() throws Throwable {
4328		final int n = expensiveTests ? 1_000_000 : 10;
4329		final CompletableFuture<Void> head = new CompletableFuture<>();
#	Line 4330 | Line 4331 | public class CompletableFutureTest exten
4331		final AtomicInteger count = new AtomicInteger(0);
4332		for (int i = 0; i < n; i++) {
4333		head.thenRun(() -> count.getAndIncrement());
4334	<	head.thenAccept((x) -> count.getAndIncrement());
4335	<	head.thenApply((x) -> count.getAndIncrement());
4334	>	head.thenAccept(x -> count.getAndIncrement());
4335	>	head.thenApply(x -> count.getAndIncrement());
4336
4337		head.runAfterBoth(complete, () -> count.getAndIncrement());
4338		head.thenAcceptBoth(complete, (x, y) -> count.getAndIncrement());
#	Line 4341 | Line 4342 | public class CompletableFutureTest exten
4342		complete.thenCombine(head, (x, y) -> count.getAndIncrement());
4343
4344		head.runAfterEither(new CompletableFuture<Void>(), () -> count.getAndIncrement());
4345	<	head.acceptEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4346	<	head.applyToEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4345	>	head.acceptEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4346	>	head.applyToEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4347		new CompletableFuture<Void>().runAfterEither(head, () -> count.getAndIncrement());
4348	<	new CompletableFuture<Void>().acceptEither(head, (x) -> count.getAndIncrement());
4349	<	new CompletableFuture<Void>().applyToEither(head, (x) -> count.getAndIncrement());
4348	>	new CompletableFuture<Void>().acceptEither(head, x -> count.getAndIncrement());
4349	>	new CompletableFuture<Void>().applyToEither(head, x -> count.getAndIncrement());
4350		}
4351		head.complete(null);
4352		assertEquals(5 * 3 * n, count.get());
4353		}
4354
4355		/** ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest tck */
4356	+	@SuppressWarnings("FutureReturnValueIgnored")
4357		public void testCoCompletionGarbageRetention() throws Throwable {
4358		final int n = expensiveTests ? 1_000_000 : 10;
4359		final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
#	Line 4362 | Line 4364 | public class CompletableFutureTest exten
4364		f.complete(null);
4365
4366		f = new CompletableFuture<>();
4367	<	f.acceptEither(incomplete, (x) -> {});
4367	>	f.acceptEither(incomplete, x -> {});
4368		f.complete(null);
4369
4370		f = new CompletableFuture<>();
4371	<	f.applyToEither(incomplete, (x) -> x);
4371	>	f.applyToEither(incomplete, x -> x);
4372		f.complete(null);
4373
4374		f = new CompletableFuture<>();
#	Line 4380 | Line 4382 | public class CompletableFutureTest exten
4382		f.complete(null);
4383
4384		f = new CompletableFuture<>();
4385	<	incomplete.acceptEither(f, (x) -> {});
4385	>	incomplete.acceptEither(f, x -> {});
4386		f.complete(null);
4387
4388		f = new CompletableFuture<>();
4389	<	incomplete.applyToEither(f, (x) -> x);
4389	>	incomplete.applyToEither(f, x -> x);
4390		f.complete(null);
4391
4392		f = new CompletableFuture<>();
#	Line 4442 | Line 4444 | public class CompletableFutureTest exten
4444		assertTrue(neverCompleted.thenRun(() -> {}).cancel(true));
4445		}
4446
4447	+	/**
4448	+	* Checks for garbage retention when MinimalStage.toCompletableFuture()
4449	+	* is invoked many times.
4450	+	* 8161600: Garbage retention when source CompletableFutures are never completed
4451	+	*
4452	+	* As of 2016-07, fails with OOME:
4453	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testToCompletableFutureGarbageRetention tck
4454	+	*/
4455	+	public void testToCompletableFutureGarbageRetention() throws Throwable {
4456	+	final int n = expensiveTests ? 900_000 : 10;
4457	+	CompletableFuture<Integer> neverCompleted = new CompletableFuture<>();
4458	+	CompletionStage minimal = neverCompleted.minimalCompletionStage();
4459	+	for (int i = 0; i < n; i++)
4460	+	assertTrue(minimal.toCompletableFuture().cancel(true));
4461	+	}
4462	+
4463		//     static <U> U join(CompletionStage<U> stage) {
4464		//         CompletableFuture<U> f = new CompletableFuture<>();
4465		//         stage.whenComplete((v, ex) -> {

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