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

Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.94 by jsr166, Wed Jun 18 02:37:38 2014 UTC vs.
Revision 1.131 by jsr166, Sun Nov 15 18:24:25 2015 UTC

#	Line 5 | Line 5
5		* http://creativecommons.org/publicdomain/zero/1.0/
6		*/
7
8	<	import junit.framework.*;
8	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
9	>	import static java.util.concurrent.TimeUnit.SECONDS;
10	>	import static java.util.concurrent.CompletableFuture.completedFuture;
11	>	import static java.util.concurrent.CompletableFuture.failedFuture;
12	>
13	>	import java.lang.reflect.Method;
14	>	import java.lang.reflect.Modifier;
15	>
16	>	import java.util.stream.Collectors;
17	>	import java.util.stream.Stream;
18	>
19	>	import java.util.ArrayList;
20	>	import java.util.Arrays;
21	>	import java.util.List;
22	>	import java.util.Objects;
23	>	import java.util.Set;
24		import java.util.concurrent.Callable;
10	–	import java.util.concurrent.Executor;
11	–	import java.util.concurrent.ExecutorService;
12	–	import java.util.concurrent.Executors;
25		import java.util.concurrent.CancellationException;
14	–	import java.util.concurrent.CountDownLatch;
15	–	import java.util.concurrent.ExecutionException;
16	–	import java.util.concurrent.Future;
26		import java.util.concurrent.CompletableFuture;
27		import java.util.concurrent.CompletionException;
28		import java.util.concurrent.CompletionStage;
29	+	import java.util.concurrent.ExecutionException;
30	+	import java.util.concurrent.Executor;
31		import java.util.concurrent.ForkJoinPool;
32		import java.util.concurrent.ForkJoinTask;
33		import java.util.concurrent.TimeoutException;
34	+	import java.util.concurrent.TimeUnit;
35		import java.util.concurrent.atomic.AtomicInteger;
36	<	import static java.util.concurrent.TimeUnit.MILLISECONDS;
25	<	import static java.util.concurrent.TimeUnit.SECONDS;
26	<	import java.util.*;
27	<	import java.util.function.Supplier;
28	<	import java.util.function.Consumer;
36	>	import java.util.concurrent.atomic.AtomicReference;
37		import java.util.function.BiConsumer;
30	–	import java.util.function.Function;
38		import java.util.function.BiFunction;
39	+	import java.util.function.Consumer;
40	+	import java.util.function.Function;
41	+	import java.util.function.Predicate;
42	+	import java.util.function.Supplier;
43	+
44	+	import junit.framework.AssertionFailedError;
45	+	import junit.framework.Test;
46	+	import junit.framework.TestSuite;
47
48		public class CompletableFutureTest extends JSR166TestCase {
49
50		public static void main(String[] args) {
51	<	junit.textui.TestRunner.run(suite());
51	>	main(suite(), args);
52		}
53		public static Test suite() {
54		return new TestSuite(CompletableFutureTest.class);
#	Line 44 | Line 59 | public class CompletableFutureTest exten
59		void checkIncomplete(CompletableFuture<?> f) {
60		assertFalse(f.isDone());
61		assertFalse(f.isCancelled());
62	<	assertTrue(f.toString().contains("[Not completed]"));
62	>	assertTrue(f.toString().contains("Not completed"));
63		try {
64		assertNull(f.getNow(null));
65		} catch (Throwable fail) { threadUnexpectedException(fail); }
#	Line 57 | Line 72 | public class CompletableFutureTest exten
72		}
73
74		<T> void checkCompletedNormally(CompletableFuture<T> f, T value) {
75	<	try {
76	<	assertEquals(value, f.get(LONG_DELAY_MS, MILLISECONDS));
62	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
75	>	checkTimedGet(f, value);
76	>
77		try {
78		assertEquals(value, f.join());
79		} catch (Throwable fail) { threadUnexpectedException(fail); }
#	Line 75 | Line 89 | public class CompletableFutureTest exten
89		assertTrue(f.toString().contains("[Completed normally]"));
90		}
91
92	<	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
93	<	try {
94	<	f.get(LONG_DELAY_MS, MILLISECONDS);
95	<	shouldThrow();
96	<	} catch (ExecutionException success) {
97	<	assertTrue(success.getCause() instanceof CFException);
98	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
99	<	try {
100	<	f.join();
101	<	shouldThrow();
102	<	} catch (CompletionException success) {
103	<	assertTrue(success.getCause() instanceof CFException);
104	<	}
105	<	try {
106	<	f.getNow(null);
107	<	shouldThrow();
108	<	} catch (CompletionException success) {
95	<	assertTrue(success.getCause() instanceof CFException);
92	>	/**
93	>	* Returns the "raw" internal exceptional completion of f,
94	>	* without any additional wrapping with CompletionException.
95	>	*/
96	>	<U> Throwable exceptionalCompletion(CompletableFuture<U> f) {
97	>	// handle (and whenComplete) can distinguish between "direct"
98	>	// and "wrapped" exceptional completion
99	>	return f.handle((U u, Throwable t) -> t).join();
100	>	}
101	>
102	>	void checkCompletedExceptionally(CompletableFuture<?> f,
103	>	boolean wrapped,
104	>	Consumer<Throwable> checker) {
105	>	Throwable cause = exceptionalCompletion(f);
106	>	if (wrapped) {
107	>	assertTrue(cause instanceof CompletionException);
108	>	cause = cause.getCause();
109		}
110	<	try {
98	<	f.get();
99	<	shouldThrow();
100	<	} catch (ExecutionException success) {
101	<	assertTrue(success.getCause() instanceof CFException);
102	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
103	<	assertTrue(f.isDone());
104	<	assertFalse(f.isCancelled());
105	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
106	<	}
110	>	checker.accept(cause);
111
112	<	<U> void checkCompletedExceptionallyWithRootCause(CompletableFuture<U> f,
109	<	Throwable ex) {
112	>	long startTime = System.nanoTime();
113		try {
114		f.get(LONG_DELAY_MS, MILLISECONDS);
115		shouldThrow();
116		} catch (ExecutionException success) {
117	<	assertSame(ex, success.getCause());
117	>	assertSame(cause, success.getCause());
118		} catch (Throwable fail) { threadUnexpectedException(fail); }
119	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
120	+
121		try {
122		f.join();
123		shouldThrow();
124		} catch (CompletionException success) {
125	<	assertSame(ex, success.getCause());
126	<	}
125	>	assertSame(cause, success.getCause());
126	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
127	>
128		try {
129		f.getNow(null);
130		shouldThrow();
131		} catch (CompletionException success) {
132	<	assertSame(ex, success.getCause());
133	<	}
132	>	assertSame(cause, success.getCause());
133	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
134	>
135		try {
136		f.get();
137		shouldThrow();
138		} catch (ExecutionException success) {
139	<	assertSame(ex, success.getCause());
139	>	assertSame(cause, success.getCause());
140		} catch (Throwable fail) { threadUnexpectedException(fail); }
141
135	–	assertTrue(f.isDone());
142		assertFalse(f.isCancelled());
143	+	assertTrue(f.isDone());
144	+	assertTrue(f.isCompletedExceptionally());
145		assertTrue(f.toString().contains("[Completed exceptionally]"));
146		}
147
148	<	<U> void checkCompletedWithWrappedException(CompletableFuture<U> f,
149	<	Throwable ex) {
150	<	checkCompletedExceptionallyWithRootCause(f, ex);
143	<	try {
144	<	CompletableFuture<Throwable> spy = f.handle
145	<	((U u, Throwable t) -> t);
146	<	assertTrue(spy.join() instanceof CompletionException);
147	<	assertSame(ex, spy.join().getCause());
148	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
148	>	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
149	>	checkCompletedExceptionally(f, true,
150	>	(t) -> assertTrue(t instanceof CFException));
151		}
152
153	<	<U> void checkCompletedExceptionally(CompletableFuture<U> f, Throwable ex) {
154	<	checkCompletedExceptionallyWithRootCause(f, ex);
155	<	try {
156	<	CompletableFuture<Throwable> spy = f.handle
157	<	((U u, Throwable t) -> t);
158	<	assertSame(ex, spy.join());
159	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
153	>	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
154	>	checkCompletedExceptionally(f, true,
155	>	(t) -> assertTrue(t instanceof CancellationException));
156	>	}
157	>
158	>	void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
159	>	checkCompletedExceptionally(f, false,
160	>	(t) -> assertTrue(t instanceof TimeoutException));
161	>	}
162	>
163	>	void checkCompletedWithWrappedException(CompletableFuture<?> f,
164	>	Throwable ex) {
165	>	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
166	>	}
167	>
168	>	void checkCompletedExceptionally(CompletableFuture<?> f, Throwable ex) {
169	>	checkCompletedExceptionally(f, false, (t) -> assertSame(t, ex));
170		}
171
172		void checkCancelled(CompletableFuture<?> f) {
173	+	long startTime = System.nanoTime();
174		try {
175		f.get(LONG_DELAY_MS, MILLISECONDS);
176		shouldThrow();
177		} catch (CancellationException success) {
178		} catch (Throwable fail) { threadUnexpectedException(fail); }
179	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
180	+
181		try {
182		f.join();
183		shouldThrow();
#	Line 176 | Line 191 | public class CompletableFutureTest exten
191		shouldThrow();
192		} catch (CancellationException success) {
193		} catch (Throwable fail) { threadUnexpectedException(fail); }
179	–	assertTrue(f.isDone());
180	–	assertTrue(f.isCompletedExceptionally());
181	–	assertTrue(f.isCancelled());
182	–	assertTrue(f.toString().contains("[Completed exceptionally]"));
183	–	}
194
195	<	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
196	<	try {
187	<	f.get(LONG_DELAY_MS, MILLISECONDS);
188	<	shouldThrow();
189	<	} catch (ExecutionException success) {
190	<	assertTrue(success.getCause() instanceof CancellationException);
191	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
192	<	try {
193	<	f.join();
194	<	shouldThrow();
195	<	} catch (CompletionException success) {
196	<	assertTrue(success.getCause() instanceof CancellationException);
197	<	}
198	<	try {
199	<	f.getNow(null);
200	<	shouldThrow();
201	<	} catch (CompletionException success) {
202	<	assertTrue(success.getCause() instanceof CancellationException);
203	<	}
204	<	try {
205	<	f.get();
206	<	shouldThrow();
207	<	} catch (ExecutionException success) {
208	<	assertTrue(success.getCause() instanceof CancellationException);
209	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
195	>	assertTrue(exceptionalCompletion(f) instanceof CancellationException);
196	>
197		assertTrue(f.isDone());
211	–	assertFalse(f.isCancelled());
198		assertTrue(f.isCompletedExceptionally());
199	+	assertTrue(f.isCancelled());
200		assertTrue(f.toString().contains("[Completed exceptionally]"));
201		}
202
#	Line 257 | Line 244 | public class CompletableFutureTest exten
244		{
245		CompletableFuture<Integer> f = new CompletableFuture<>();
246		checkIncomplete(f);
247	<	assertTrue(f.cancel(true));
248	<	assertTrue(f.cancel(true));
247	>	assertTrue(f.cancel(mayInterruptIfRunning));
248	>	assertTrue(f.cancel(mayInterruptIfRunning));
249	>	assertTrue(f.cancel(!mayInterruptIfRunning));
250		checkCancelled(f);
251		}}
252
#	Line 530 | Line 518 | public class CompletableFutureTest exten
518		}
519		}
520
533	–
521		class CompletableFutureInc extends CheckedIntegerAction
522		implements Function<Integer, CompletableFuture<Integer>>
523		{
#	Line 569 | Line 556 | public class CompletableFutureTest exten
556		}
557		}
558
559	+	static final boolean defaultExecutorIsCommonPool
560	+	= ForkJoinPool.getCommonPoolParallelism() > 1;
561	+
562		/**
563		* Permits the testing of parallel code for the 3 different
564		* execution modes without copy/pasting all the test methods.
565		*/
566		enum ExecutionMode {
567	<	DEFAULT {
567	>	SYNC {
568		public void checkExecutionMode() {
569		assertFalse(ThreadExecutor.startedCurrentThread());
570		assertNull(ForkJoinTask.getPool());
#	Line 650 | Line 640 | public class CompletableFutureTest exten
640
641		ASYNC {
642		public void checkExecutionMode() {
643	<	assertSame(ForkJoinPool.commonPool(),
644	<	ForkJoinTask.getPool());
643	>	assertEquals(defaultExecutorIsCommonPool,
644	>	(ForkJoinPool.commonPool() == ForkJoinTask.getPool()));
645		}
646		public CompletableFuture<Void> runAsync(Runnable a) {
647		return CompletableFuture.runAsync(a);
#	Line 850 | Line 840 | public class CompletableFutureTest exten
840		if (!createIncomplete) assertTrue(f.complete(v1));
841		final CompletableFuture<Integer> g = f.exceptionally
842		((Throwable t) -> {
853	–	// Should not be called
843		a.getAndIncrement();
844	<	throw new AssertionError();
844	>	threadFail("should not be called");
845	>	return null;            // unreached
846		});
847		if (createIncomplete) assertTrue(f.complete(v1));
848
#	Line 875 | Line 865 | public class CompletableFutureTest exten
865		if (!createIncomplete) f.completeExceptionally(ex);
866		final CompletableFuture<Integer> g = f.exceptionally
867		((Throwable t) -> {
868	<	ExecutionMode.DEFAULT.checkExecutionMode();
868	>	ExecutionMode.SYNC.checkExecutionMode();
869		threadAssertSame(t, ex);
870		a.getAndIncrement();
871		return v1;
#	Line 888 | Line 878 | public class CompletableFutureTest exten
878
879		public void testExceptionally_exceptionalCompletionActionFailed() {
880		for (boolean createIncomplete : new boolean[] { true, false })
891	–	for (Integer v1 : new Integer[] { 1, null })
881		{
882		final AtomicInteger a = new AtomicInteger(0);
883		final CFException ex1 = new CFException();
#	Line 897 | Line 886 | public class CompletableFutureTest exten
886		if (!createIncomplete) f.completeExceptionally(ex1);
887		final CompletableFuture<Integer> g = f.exceptionally
888		((Throwable t) -> {
889	<	ExecutionMode.DEFAULT.checkExecutionMode();
889	>	ExecutionMode.SYNC.checkExecutionMode();
890		threadAssertSame(t, ex1);
891		a.getAndIncrement();
892		throw ex2;
#	Line 912 | Line 901 | public class CompletableFutureTest exten
901		* whenComplete action executes on normal completion, propagating
902		* source result.
903		*/
904	<	public void testWhenComplete_normalCompletion1() {
904	>	public void testWhenComplete_normalCompletion() {
905		for (ExecutionMode m : ExecutionMode.values())
906		for (boolean createIncomplete : new boolean[] { true, false })
907		for (Integer v1 : new Integer[] { 1, null })
#	Line 942 | Line 931 | public class CompletableFutureTest exten
931		public void testWhenComplete_exceptionalCompletion() {
932		for (ExecutionMode m : ExecutionMode.values())
933		for (boolean createIncomplete : new boolean[] { true, false })
945	–	for (Integer v1 : new Integer[] { 1, null })
934		{
935		final AtomicInteger a = new AtomicInteger(0);
936		final CFException ex = new CFException();
#	Line 1027 | Line 1015 | public class CompletableFutureTest exten
1015		public void testWhenComplete_actionFailedSourceFailed() {
1016		for (boolean createIncomplete : new boolean[] { true, false })
1017		for (ExecutionMode m : ExecutionMode.values())
1030	–	for (Integer v1 : new Integer[] { 1, null })
1018		{
1019		final AtomicInteger a = new AtomicInteger(0);
1020		final CFException ex1 = new CFException();
#	Line 2975 | Line 2962 | public class CompletableFutureTest exten
2962		checkCancelled(f);
2963		}}
2964
2965	+	/**
2966	+	* thenCompose result completes exceptionally if the result of the action does
2967	+	*/
2968	+	public void testThenCompose_actionReturnsFailingFuture() {
2969	+	for (ExecutionMode m : ExecutionMode.values())
2970	+	for (int order = 0; order < 6; order++)
2971	+	for (Integer v1 : new Integer[] { 1, null })
2972	+	{
2973	+	final CFException ex = new CFException();
2974	+	final CompletableFuture<Integer> f = new CompletableFuture<>();
2975	+	final CompletableFuture<Integer> g = new CompletableFuture<>();
2976	+	final CompletableFuture<Integer> h;
2977	+	// Test all permutations of orders
2978	+	switch (order) {
2979	+	case 0:
2980	+	assertTrue(f.complete(v1));
2981	+	assertTrue(g.completeExceptionally(ex));
2982	+	h = m.thenCompose(f, (x -> g));
2983	+	break;
2984	+	case 1:
2985	+	assertTrue(f.complete(v1));
2986	+	h = m.thenCompose(f, (x -> g));
2987	+	assertTrue(g.completeExceptionally(ex));
2988	+	break;
2989	+	case 2:
2990	+	assertTrue(g.completeExceptionally(ex));
2991	+	assertTrue(f.complete(v1));
2992	+	h = m.thenCompose(f, (x -> g));
2993	+	break;
2994	+	case 3:
2995	+	assertTrue(g.completeExceptionally(ex));
2996	+	h = m.thenCompose(f, (x -> g));
2997	+	assertTrue(f.complete(v1));
2998	+	break;
2999	+	case 4:
3000	+	h = m.thenCompose(f, (x -> g));
3001	+	assertTrue(f.complete(v1));
3002	+	assertTrue(g.completeExceptionally(ex));
3003	+	break;
3004	+	case 5:
3005	+	h = m.thenCompose(f, (x -> g));
3006	+	assertTrue(f.complete(v1));
3007	+	assertTrue(g.completeExceptionally(ex));
3008	+	break;
3009	+	default: throw new AssertionError();
3010	+	}
3011	+
3012	+	checkCompletedExceptionally(g, ex);
3013	+	checkCompletedWithWrappedException(h, ex);
3014	+	checkCompletedNormally(f, v1);
3015	+	}}
3016	+
3017		// other static methods
3018
3019		/**
#	Line 3035 | Line 3074 | public class CompletableFutureTest exten
3074		for (int i = 0; i < k; i++) {
3075		checkIncomplete(f);
3076		checkIncomplete(CompletableFuture.allOf(fs));
3077	<	if (i != k/2) {
3077	>	if (i != k / 2) {
3078		fs[i].complete(i);
3079		checkCompletedNormally(fs[i], i);
3080		} else {
#	Line 3142 | Line 3181 | public class CompletableFutureTest exten
3181		CompletableFuture<Integer> f = new CompletableFuture<>();
3182		CompletableFuture<Integer> g = new CompletableFuture<>();
3183		CompletableFuture<Integer> nullFuture = (CompletableFuture<Integer>)null;
3145	–	CompletableFuture<?> h;
3184		ThreadExecutor exec = new ThreadExecutor();
3185
3186		Runnable[] throwingActions = {
3187		() -> CompletableFuture.supplyAsync(null),
3188		() -> CompletableFuture.supplyAsync(null, exec),
3189	<	() -> CompletableFuture.supplyAsync(new IntegerSupplier(ExecutionMode.DEFAULT, 42), null),
3189	>	() -> CompletableFuture.supplyAsync(new IntegerSupplier(ExecutionMode.SYNC, 42), null),
3190
3191		() -> CompletableFuture.runAsync(null),
3192		() -> CompletableFuture.runAsync(null, exec),
#	Line 3239 | Line 3277 | public class CompletableFutureTest exten
3277		() -> CompletableFuture.anyOf(null, f),
3278
3279		() -> f.obtrudeException(null),
3280	+
3281	+	() -> CompletableFuture.delayedExecutor(1L, SECONDS, null),
3282	+	() -> CompletableFuture.delayedExecutor(1L, null, new ThreadExecutor()),
3283	+	() -> CompletableFuture.delayedExecutor(1L, null),
3284	+
3285	+	() -> f.orTimeout(1L, null),
3286	+	() -> f.completeOnTimeout(42, 1L, null),
3287	+
3288	+	() -> CompletableFuture.failedFuture(null),
3289	+	() -> CompletableFuture.failedStage(null),
3290		};
3291
3292		assertThrows(NullPointerException.class, throwingActions);
#	Line 3253 | Line 3301 | public class CompletableFutureTest exten
3301		assertSame(f, f.toCompletableFuture());
3302		}
3303
3304	+	// jdk9
3305	+
3306	+	/**
3307	+	* newIncompleteFuture returns an incomplete CompletableFuture
3308	+	*/
3309	+	public void testNewIncompleteFuture() {
3310	+	for (Integer v1 : new Integer[] { 1, null })
3311	+	{
3312	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3313	+	CompletableFuture<Integer> g = f.newIncompleteFuture();
3314	+	checkIncomplete(f);
3315	+	checkIncomplete(g);
3316	+	f.complete(v1);
3317	+	checkCompletedNormally(f, v1);
3318	+	checkIncomplete(g);
3319	+	g.complete(v1);
3320	+	checkCompletedNormally(g, v1);
3321	+	assertSame(g.getClass(), CompletableFuture.class);
3322	+	}}
3323	+
3324	+	/**
3325	+	* completedStage returns a completed CompletionStage
3326	+	*/
3327	+	public void testCompletedStage() {
3328	+	AtomicInteger x = new AtomicInteger(0);
3329	+	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3330	+	CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3331	+	f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3332	+	assertEquals(x.get(), 1);
3333	+	assertNull(r.get());
3334	+	}
3335	+
3336	+	/**
3337	+	* defaultExecutor by default returns the commonPool if
3338	+	* it supports more than one thread.
3339	+	*/
3340	+	public void testDefaultExecutor() {
3341	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3342	+	Executor e = f.defaultExecutor();
3343	+	Executor c = ForkJoinPool.commonPool();
3344	+	if (ForkJoinPool.getCommonPoolParallelism() > 1)
3345	+	assertSame(e, c);
3346	+	else
3347	+	assertNotSame(e, c);
3348	+	}
3349	+
3350	+	/**
3351	+	* failedFuture returns a CompletableFuture completed
3352	+	* exceptionally with the given Exception
3353	+	*/
3354	+	public void testFailedFuture() {
3355	+	CFException ex = new CFException();
3356	+	CompletableFuture<Integer> f = CompletableFuture.failedFuture(ex);
3357	+	checkCompletedExceptionally(f, ex);
3358	+	}
3359	+
3360	+	/**
3361	+	* failedFuture(null) throws NPE
3362	+	*/
3363	+	public void testFailedFuture_null() {
3364	+	try {
3365	+	CompletableFuture<Integer> f = CompletableFuture.failedFuture(null);
3366	+	shouldThrow();
3367	+	} catch (NullPointerException success) {}
3368	+	}
3369	+
3370	+	/**
3371	+	* copy returns a CompletableFuture that is completed normally,
3372	+	* with the same value, when source is.
3373	+	*/
3374	+	public void testCopy() {
3375	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3376	+	CompletableFuture<Integer> g = f.copy();
3377	+	checkIncomplete(f);
3378	+	checkIncomplete(g);
3379	+	f.complete(1);
3380	+	checkCompletedNormally(f, 1);
3381	+	checkCompletedNormally(g, 1);
3382	+	}
3383	+
3384	+	/**
3385	+	* copy returns a CompletableFuture that is completed exceptionally
3386	+	* when source is.
3387	+	*/
3388	+	public void testCopy2() {
3389	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3390	+	CompletableFuture<Integer> g = f.copy();
3391	+	checkIncomplete(f);
3392	+	checkIncomplete(g);
3393	+	CFException ex = new CFException();
3394	+	f.completeExceptionally(ex);
3395	+	checkCompletedExceptionally(f, ex);
3396	+	checkCompletedWithWrappedException(g, ex);
3397	+	}
3398	+
3399	+	/**
3400	+	* minimalCompletionStage returns a CompletableFuture that is
3401	+	* completed normally, with the same value, when source is.
3402	+	*/
3403	+	public void testMinimalCompletionStage() {
3404	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3405	+	CompletionStage<Integer> g = f.minimalCompletionStage();
3406	+	AtomicInteger x = new AtomicInteger(0);
3407	+	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3408	+	checkIncomplete(f);
3409	+	g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3410	+	f.complete(1);
3411	+	checkCompletedNormally(f, 1);
3412	+	assertEquals(x.get(), 1);
3413	+	assertNull(r.get());
3414	+	}
3415	+
3416	+	/**
3417	+	* minimalCompletionStage returns a CompletableFuture that is
3418	+	* completed exceptionally when source is.
3419	+	*/
3420	+	public void testMinimalCompletionStage2() {
3421	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3422	+	CompletionStage<Integer> g = f.minimalCompletionStage();
3423	+	AtomicInteger x = new AtomicInteger(0);
3424	+	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3425	+	g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3426	+	checkIncomplete(f);
3427	+	CFException ex = new CFException();
3428	+	f.completeExceptionally(ex);
3429	+	checkCompletedExceptionally(f, ex);
3430	+	assertEquals(x.get(), 0);
3431	+	assertEquals(r.get().getCause(), ex);
3432	+	}
3433	+
3434	+	/**
3435	+	* failedStage returns a CompletionStage completed
3436	+	* exceptionally with the given Exception
3437	+	*/
3438	+	public void testFailedStage() {
3439	+	CFException ex = new CFException();
3440	+	CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3441	+	AtomicInteger x = new AtomicInteger(0);
3442	+	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3443	+	f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3444	+	assertEquals(x.get(), 0);
3445	+	assertEquals(r.get(), ex);
3446	+	}
3447	+
3448	+	/**
3449	+	* completeAsync completes with value of given supplier
3450	+	*/
3451	+	public void testCompleteAsync() {
3452	+	for (Integer v1 : new Integer[] { 1, null })
3453	+	{
3454	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3455	+	f.completeAsync(() -> v1);
3456	+	f.join();
3457	+	checkCompletedNormally(f, v1);
3458	+	}}
3459	+
3460	+	/**
3461	+	* completeAsync completes exceptionally if given supplier throws
3462	+	*/
3463	+	public void testCompleteAsync2() {
3464	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3465	+	CFException ex = new CFException();
3466	+	f.completeAsync(() -> {if (true) throw ex; return 1;});
3467	+	try {
3468	+	f.join();
3469	+	shouldThrow();
3470	+	} catch (CompletionException success) {}
3471	+	checkCompletedWithWrappedException(f, ex);
3472	+	}
3473	+
3474	+	/**
3475	+	* completeAsync with given executor completes with value of given supplier
3476	+	*/
3477	+	public void testCompleteAsync3() {
3478	+	for (Integer v1 : new Integer[] { 1, null })
3479	+	{
3480	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3481	+	ThreadExecutor executor = new ThreadExecutor();
3482	+	f.completeAsync(() -> v1, executor);
3483	+	assertSame(v1, f.join());
3484	+	checkCompletedNormally(f, v1);
3485	+	assertEquals(1, executor.count.get());
3486	+	}}
3487	+
3488	+	/**
3489	+	* completeAsync with given executor completes exceptionally if
3490	+	* given supplier throws
3491	+	*/
3492	+	public void testCompleteAsync4() {
3493	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3494	+	CFException ex = new CFException();
3495	+	ThreadExecutor executor = new ThreadExecutor();
3496	+	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3497	+	try {
3498	+	f.join();
3499	+	shouldThrow();
3500	+	} catch (CompletionException success) {}
3501	+	checkCompletedWithWrappedException(f, ex);
3502	+	assertEquals(1, executor.count.get());
3503	+	}
3504	+
3505	+	/**
3506	+	* orTimeout completes with TimeoutException if not complete
3507	+	*/
3508	+	public void testOrTimeout_timesOut() {
3509	+	long timeoutMillis = timeoutMillis();
3510	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3511	+	long startTime = System.nanoTime();
3512	+	f.orTimeout(timeoutMillis, MILLISECONDS);
3513	+	checkCompletedWithTimeoutException(f);
3514	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3515	+	}
3516	+
3517	+	/**
3518	+	* orTimeout completes normally if completed before timeout
3519	+	*/
3520	+	public void testOrTimeout_completed() {
3521	+	for (Integer v1 : new Integer[] { 1, null })
3522	+	{
3523	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3524	+	CompletableFuture<Integer> g = new CompletableFuture<>();
3525	+	long startTime = System.nanoTime();
3526	+	f.complete(v1);
3527	+	f.orTimeout(LONG_DELAY_MS, MILLISECONDS);
3528	+	g.orTimeout(LONG_DELAY_MS, MILLISECONDS);
3529	+	g.complete(v1);
3530	+	checkCompletedNormally(f, v1);
3531	+	checkCompletedNormally(g, v1);
3532	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3533	+	}}
3534	+
3535	+	/**
3536	+	* completeOnTimeout completes with given value if not complete
3537	+	*/
3538	+	public void testCompleteOnTimeout_timesOut() {
3539	+	testInParallel(() -> testCompleteOnTimeout_timesOut(42),
3540	+	() -> testCompleteOnTimeout_timesOut(null));
3541	+	}
3542	+
3543	+	public void testCompleteOnTimeout_timesOut(Integer v) {
3544	+	long timeoutMillis = timeoutMillis();
3545	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3546	+	long startTime = System.nanoTime();
3547	+	f.completeOnTimeout(v, timeoutMillis, MILLISECONDS);
3548	+	assertSame(v, f.join());
3549	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3550	+	f.complete(99);         // should have no effect
3551	+	checkCompletedNormally(f, v);
3552	+	}
3553	+
3554	+	/**
3555	+	* completeOnTimeout has no effect if completed within timeout
3556	+	*/
3557	+	public void testCompleteOnTimeout_completed() {
3558	+	for (Integer v1 : new Integer[] { 1, null })
3559	+	{
3560	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3561	+	CompletableFuture<Integer> g = new CompletableFuture<>();
3562	+	long startTime = System.nanoTime();
3563	+	f.complete(v1);
3564	+	f.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
3565	+	g.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
3566	+	g.complete(v1);
3567	+	checkCompletedNormally(f, v1);
3568	+	checkCompletedNormally(g, v1);
3569	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3570	+	}}
3571	+
3572	+	/**
3573	+	* delayedExecutor returns an executor that delays submission
3574	+	*/
3575	+	public void testDelayedExecutor() {
3576	+	testInParallel(() -> testDelayedExecutor(null, null),
3577	+	() -> testDelayedExecutor(null, 1),
3578	+	() -> testDelayedExecutor(new ThreadExecutor(), 1),
3579	+	() -> testDelayedExecutor(new ThreadExecutor(), 1));
3580	+	}
3581	+
3582	+	public void testDelayedExecutor(Executor executor, Integer v) throws Exception {
3583	+	long timeoutMillis = timeoutMillis();
3584	+	// Use an "unreasonably long" long timeout to catch lingering threads
3585	+	long longTimeoutMillis = 1000 * 60 * 60 * 24;
3586	+	final Executor delayer, longDelayer;
3587	+	if (executor == null) {
3588	+	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS);
3589	+	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS);
3590	+	} else {
3591	+	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS, executor);
3592	+	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS, executor);
3593	+	}
3594	+	long startTime = System.nanoTime();
3595	+	CompletableFuture<Integer> f =
3596	+	CompletableFuture.supplyAsync(() -> v, delayer);
3597	+	CompletableFuture<Integer> g =
3598	+	CompletableFuture.supplyAsync(() -> v, longDelayer);
3599	+
3600	+	assertNull(g.getNow(null));
3601	+
3602	+	assertSame(v, f.get(LONG_DELAY_MS, MILLISECONDS));
3603	+	long millisElapsed = millisElapsedSince(startTime);
3604	+	assertTrue(millisElapsed >= timeoutMillis);
3605	+	assertTrue(millisElapsed < LONG_DELAY_MS / 2);
3606	+
3607	+	checkCompletedNormally(f, v);
3608	+
3609	+	checkIncomplete(g);
3610	+	assertTrue(g.cancel(true));
3611	+	}
3612	+
3613		//--- tests of implementation details; not part of official tck ---
3614
3615		Object resultOf(CompletableFuture<?> f) {
#	Line 3343 | Line 3700 | public class CompletableFutureTest exten
3700		}
3701		}}
3702
3703	+	/**
3704	+	* Minimal completion stages throw UOE for all non-CompletionStage methods
3705	+	*/
3706	+	public void testMinimalCompletionStage_minimality() {
3707	+	if (!testImplementationDetails) return;
3708	+	Function<Method, String> toSignature =
3709	+	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3710	+	Predicate<Method> isNotStatic =
3711	+	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3712	+	List<Method> minimalMethods =
3713	+	Stream.of(Object.class, CompletionStage.class)
3714	+	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3715	+	.filter(isNotStatic)
3716	+	.collect(Collectors.toList());
3717	+	// Methods from CompletableFuture permitted NOT to throw UOE
3718	+	String[] signatureWhitelist = {
3719	+	"newIncompleteFuture[]",
3720	+	"defaultExecutor[]",
3721	+	"minimalCompletionStage[]",
3722	+	"copy[]",
3723	+	};
3724	+	Set<String> permittedMethodSignatures =
3725	+	Stream.concat(minimalMethods.stream().map(toSignature),
3726	+	Stream.of(signatureWhitelist))
3727	+	.collect(Collectors.toSet());
3728	+	List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
3729	+	.filter(isNotStatic)
3730	+	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3731	+	.collect(Collectors.toList());
3732	+
3733	+	CompletionStage<Integer> minimalStage =
3734	+	new CompletableFuture<Integer>().minimalCompletionStage();
3735	+
3736	+	List<Method> bugs = new ArrayList<>();
3737	+	for (Method method : allMethods) {
3738	+	Class<?>[] parameterTypes = method.getParameterTypes();
3739	+	Object[] args = new Object[parameterTypes.length];
3740	+	// Manufacture boxed primitives for primitive params
3741	+	for (int i = 0; i < args.length; i++) {
3742	+	Class<?> type = parameterTypes[i];
3743	+	if (parameterTypes[i] == boolean.class)
3744	+	args[i] = false;
3745	+	else if (parameterTypes[i] == int.class)
3746	+	args[i] = 0;
3747	+	else if (parameterTypes[i] == long.class)
3748	+	args[i] = 0L;
3749	+	}
3750	+	try {
3751	+	method.invoke(minimalStage, args);
3752	+	bugs.add(method);
3753	+	}
3754	+	catch (java.lang.reflect.InvocationTargetException expected) {
3755	+	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
3756	+	bugs.add(method);
3757	+	// expected.getCause().printStackTrace();
3758	+	}
3759	+	}
3760	+	catch (ReflectiveOperationException bad) { throw new Error(bad); }
3761	+	}
3762	+	if (!bugs.isEmpty())
3763	+	throw new Error("Methods did not throw UOE: " + bugs.toString());
3764	+	}
3765	+
3766	+	static class Monad {
3767	+	static class ZeroException extends RuntimeException {
3768	+	public ZeroException() { super("monadic zero"); }
3769	+	}
3770	+	// "return", "unit"
3771	+	static <T> CompletableFuture<T> unit(T value) {
3772	+	return completedFuture(value);
3773	+	}
3774	+	// monadic zero ?
3775	+	static <T> CompletableFuture<T> zero() {
3776	+	return failedFuture(new ZeroException());
3777	+	}
3778	+	// >=>
3779	+	static <T,U,V> Function<T, CompletableFuture<V>> compose
3780	+	(Function<T, CompletableFuture<U>> f,
3781	+	Function<U, CompletableFuture<V>> g) {
3782	+	return (x) -> f.apply(x).thenCompose(g);
3783	+	}
3784	+
3785	+	static void assertZero(CompletableFuture<?> f) {
3786	+	try {
3787	+	f.getNow(null);
3788	+	throw new AssertionFailedError("should throw");
3789	+	} catch (CompletionException success) {
3790	+	assertTrue(success.getCause() instanceof ZeroException);
3791	+	}
3792	+	}
3793	+
3794	+	static <T> void assertFutureEquals(CompletableFuture<T> f,
3795	+	CompletableFuture<T> g) {
3796	+	T fval = null, gval = null;
3797	+	Throwable fex = null, gex = null;
3798	+
3799	+	try { fval = f.get(); }
3800	+	catch (ExecutionException ex) { fex = ex.getCause(); }
3801	+	catch (Throwable ex) { fex = ex; }
3802	+
3803	+	try { gval = g.get(); }
3804	+	catch (ExecutionException ex) { gex = ex.getCause(); }
3805	+	catch (Throwable ex) { gex = ex; }
3806	+
3807	+	if (fex != null || gex != null)
3808	+	assertSame(fex.getClass(), gex.getClass());
3809	+	else
3810	+	assertEquals(fval, gval);
3811	+	}
3812	+
3813	+	static class PlusFuture<T> extends CompletableFuture<T> {
3814	+	AtomicReference<Throwable> firstFailure = new AtomicReference<>(null);
3815	+	}
3816	+
3817	+	// Monadic "plus"
3818	+	static <T> CompletableFuture<T> plus(CompletableFuture<? extends T> f,
3819	+	CompletableFuture<? extends T> g) {
3820	+	PlusFuture<T> plus = new PlusFuture<T>();
3821	+	BiConsumer<T, Throwable> action = (T result, Throwable ex) -> {
3822	+	if (ex == null) {
3823	+	if (plus.complete(result))
3824	+	if (plus.firstFailure.get() != null)
3825	+	plus.firstFailure.set(null);
3826	+	}
3827	+	else if (plus.firstFailure.compareAndSet(null, ex)) {
3828	+	if (plus.isDone())
3829	+	plus.firstFailure.set(null);
3830	+	}
3831	+	else {
3832	+	// first failure has precedence
3833	+	Throwable first = plus.firstFailure.getAndSet(null);
3834	+
3835	+	// may fail with "Self-suppression not permitted"
3836	+	try { first.addSuppressed(ex); }
3837	+	catch (Exception ignored) {}
3838	+
3839	+	plus.completeExceptionally(first);
3840	+	}
3841	+	};
3842	+	f.whenComplete(action);
3843	+	g.whenComplete(action);
3844	+	return plus;
3845	+	}
3846	+	}
3847	+
3848	+	/**
3849	+	* CompletableFuture is an additive monad - sort of.
3850	+	* https://en.wikipedia.org/wiki/Monad_(functional_programming)#Additive_monads
3851	+	*/
3852	+	public void testAdditiveMonad() throws Throwable {
3853	+	Function<Long, CompletableFuture<Long>> unit = Monad::unit;
3854	+	CompletableFuture<Long> zero = Monad.zero();
3855	+
3856	+	// Some mutually non-commutative functions
3857	+	Function<Long, CompletableFuture<Long>> triple
3858	+	= (x) -> Monad.unit(3 * x);
3859	+	Function<Long, CompletableFuture<Long>> inc
3860	+	= (x) -> Monad.unit(x + 1);
3861	+
3862	+	// unit is a right identity: m >>= unit === m
3863	+	Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
3864	+	inc.apply(5L));
3865	+	// unit is a left identity: (unit x) >>= f === f x
3866	+	Monad.assertFutureEquals(unit.apply(5L).thenCompose(inc),
3867	+	inc.apply(5L));
3868	+
3869	+	// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
3870	+	Monad.assertFutureEquals(
3871	+	unit.apply(5L).thenCompose(inc).thenCompose(triple),
3872	+	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
3873	+
3874	+	// The case for CompletableFuture as an additive monad is weaker...
3875	+
3876	+	// zero is a monadic zero
3877	+	Monad.assertZero(zero);
3878	+
3879	+	// left zero: zero >>= f === zero
3880	+	Monad.assertZero(zero.thenCompose(inc));
3881	+	// right zero: f >>= (\x -> zero) === zero
3882	+	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
3883	+
3884	+	// f plus zero === f
3885	+	Monad.assertFutureEquals(Monad.unit(5L),
3886	+	Monad.plus(Monad.unit(5L), zero));
3887	+	// zero plus f === f
3888	+	Monad.assertFutureEquals(Monad.unit(5L),
3889	+	Monad.plus(zero, Monad.unit(5L)));
3890	+	// zero plus zero === zero
3891	+	Monad.assertZero(Monad.plus(zero, zero));
3892	+	{
3893	+	CompletableFuture<Long> f = Monad.plus(Monad.unit(5L),
3894	+	Monad.unit(8L));
3895	+	// non-determinism
3896	+	assertTrue(f.get() == 5L || f.get() == 8L);
3897	+	}
3898	+
3899	+	CompletableFuture<Long> godot = new CompletableFuture<>();
3900	+	// f plus godot === f (doesn't wait for godot)
3901	+	Monad.assertFutureEquals(Monad.unit(5L),
3902	+	Monad.plus(Monad.unit(5L), godot));
3903	+	// godot plus f === f (doesn't wait for godot)
3904	+	Monad.assertFutureEquals(Monad.unit(5L),
3905	+	Monad.plus(godot, Monad.unit(5L)));
3906	+	}
3907	+
3908	+	//     static <U> U join(CompletionStage<U> stage) {
3909	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3910	+	//         stage.whenComplete((v, ex) -> {
3911	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3912	+	//         });
3913	+	//         return f.join();
3914	+	//     }
3915	+
3916	+	//     static <U> boolean isDone(CompletionStage<U> stage) {
3917	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3918	+	//         stage.whenComplete((v, ex) -> {
3919	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3920	+	//         });
3921	+	//         return f.isDone();
3922	+	//     }
3923	+
3924	+	//     static <U> U join2(CompletionStage<U> stage) {
3925	+	//         return stage.toCompletableFuture().copy().join();
3926	+	//     }
3927	+
3928	+	//     static <U> boolean isDone2(CompletionStage<U> stage) {
3929	+	//         return stage.toCompletableFuture().copy().isDone();
3930	+	//     }
3931	+
3932		}

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