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

Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.105 by dl, Thu Sep 3 16:30:05 2015 UTC vs.
Revision 1.146 by jsr166, Mon Apr 11 06:31:42 2016 UTC

#	Line 7 | Line 7
7
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;
25		import java.util.concurrent.CancellationException;
26		import java.util.concurrent.CompletableFuture;
#	Line 28 | Line 38 | import java.util.function.BiConsumer;
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
#	Line 77 | Line 89 | public class CompletableFutureTest exten
89		assertTrue(f.toString().contains("[Completed normally]"));
90		}
91
92	<	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
93	<	long startTime = System.nanoTime();
94	<	long timeoutMillis = LONG_DELAY_MS;
95	<	try {
96	<	f.get(timeoutMillis, MILLISECONDS);
97	<	shouldThrow();
98	<	} catch (ExecutionException success) {
99	<	assertTrue(success.getCause() instanceof CFException);
100	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
101	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
102	<
103	<	try {
104	<	f.join();
105	<	shouldThrow();
106	<	} catch (CompletionException success) {
107	<	assertTrue(success.getCause() instanceof CFException);
108	<	}
97	<	try {
98	<	f.getNow(null);
99	<	shouldThrow();
100	<	} catch (CompletionException success) {
101	<	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 {
104	<	f.get();
105	<	shouldThrow();
106	<	} catch (ExecutionException success) {
107	<	assertTrue(success.getCause() instanceof CFException);
108	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
109	<	assertTrue(f.isDone());
110	<	assertFalse(f.isCancelled());
111	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
112	<	}
110	>	checker.accept(cause);
111
114	–	<U> void checkCompletedExceptionallyWithRootCause(CompletableFuture<U> f,
115	–	Throwable ex) {
112		long startTime = System.nanoTime();
117	–	long timeoutMillis = LONG_DELAY_MS;
113		try {
114	<	f.get(timeoutMillis, MILLISECONDS);
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) < timeoutMillis/2);
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
145	–	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 checkCompletedExceptionallyWithTimeout(CompletableFuture<U> f) {
149	<	long startTime = System.nanoTime();
150	<	long timeoutMillis = LONG_DELAY_MS;
151	<	try {
154	<	f.get(timeoutMillis, MILLISECONDS);
155	<	shouldThrow();
156	<	} catch (ExecutionException ex) {
157	<	assertTrue(ex.getCause() instanceof TimeoutException);
158	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
159	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
160	<
161	<	try {
162	<	f.join();
163	<	shouldThrow();
164	<	} catch (Throwable ex) {
165	<	assertTrue(ex.getCause() instanceof TimeoutException);
166	<	}
167	<
168	<	try {
169	<	f.getNow(null);
170	<	shouldThrow();
171	<	} catch (Throwable ex) {
172	<	assertTrue(ex.getCause() instanceof TimeoutException);
173	<	}
148	>	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
149	>	checkCompletedExceptionally(f, true,
150	>	(t) -> assertTrue(t instanceof CFException));
151	>	}
152
153	<	try {
154	<	f.get();
155	<	shouldThrow();
156	<	} catch (ExecutionException ex) {
179	<	assertTrue(ex.getCause() instanceof TimeoutException);
180	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
153	>	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
154	>	checkCompletedExceptionally(f, true,
155	>	(t) -> assertTrue(t instanceof CancellationException));
156	>	}
157
158	<	assertTrue(f.isDone());
159	<	assertFalse(f.isCancelled());
160	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
158	>	void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
159	>	checkCompletedExceptionally(f, false,
160	>	(t) -> assertTrue(t instanceof TimeoutException));
161		}
162
163	<	<U> void checkCompletedWithWrappedException(CompletableFuture<U> f,
164	<	Throwable ex) {
165	<	checkCompletedExceptionallyWithRootCause(f, ex);
190	<	try {
191	<	CompletableFuture<Throwable> spy = f.handle
192	<	((U u, Throwable t) -> t);
193	<	assertTrue(spy.join() instanceof CompletionException);
194	<	assertSame(ex, spy.join().getCause());
195	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
163	>	void checkCompletedWithWrappedException(CompletableFuture<?> f,
164	>	Throwable ex) {
165	>	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
166		}
167
168	<	<U> void checkCompletedExceptionally(CompletableFuture<U> f, Throwable ex) {
169	<	checkCompletedExceptionallyWithRootCause(f, ex);
200	<	try {
201	<	CompletableFuture<Throwable> spy = f.handle
202	<	((U u, Throwable t) -> t);
203	<	assertSame(ex, spy.join());
204	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
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();
209	–	long timeoutMillis = LONG_DELAY_MS;
174		try {
175	<	f.get(timeoutMillis, MILLISECONDS);
175	>	f.get(LONG_DELAY_MS, MILLISECONDS);
176		shouldThrow();
177		} catch (CancellationException success) {
178		} catch (Throwable fail) { threadUnexpectedException(fail); }
179	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
179	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
180
181		try {
182		f.join();
#	Line 227 | Line 191 | public class CompletableFutureTest exten
191		shouldThrow();
192		} catch (CancellationException success) {
193		} catch (Throwable fail) { threadUnexpectedException(fail); }
230	–	assertTrue(f.isDone());
231	–	assertTrue(f.isCompletedExceptionally());
232	–	assertTrue(f.isCancelled());
233	–	assertTrue(f.toString().contains("[Completed exceptionally]"));
234	–	}
194
195	<	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
237	<	long startTime = System.nanoTime();
238	<	long timeoutMillis = LONG_DELAY_MS;
239	<	try {
240	<	f.get(timeoutMillis, MILLISECONDS);
241	<	shouldThrow();
242	<	} catch (ExecutionException success) {
243	<	assertTrue(success.getCause() instanceof CancellationException);
244	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
245	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
195	>	assertTrue(exceptionalCompletion(f) instanceof CancellationException);
196
247	–	try {
248	–	f.join();
249	–	shouldThrow();
250	–	} catch (CompletionException success) {
251	–	assertTrue(success.getCause() instanceof CancellationException);
252	–	}
253	–	try {
254	–	f.getNow(null);
255	–	shouldThrow();
256	–	} catch (CompletionException success) {
257	–	assertTrue(success.getCause() instanceof CancellationException);
258	–	}
259	–	try {
260	–	f.get();
261	–	shouldThrow();
262	–	} catch (ExecutionException success) {
263	–	assertTrue(success.getCause() instanceof CancellationException);
264	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
197		assertTrue(f.isDone());
266	–	assertFalse(f.isCancelled());
198		assertTrue(f.isCompletedExceptionally());
199	+	assertTrue(f.isCancelled());
200		assertTrue(f.toString().contains("[Completed exceptionally]"));
201		}
202
#	Line 908 | Line 840 | public class CompletableFutureTest exten
840		if (!createIncomplete) assertTrue(f.complete(v1));
841		final CompletableFuture<Integer> g = f.exceptionally
842		((Throwable t) -> {
911	–	// 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 944 | Line 876 | public class CompletableFutureTest exten
876		assertEquals(1, a.get());
877		}}
878
879	+	/**
880	+	* If an "exceptionally action" throws an exception, it completes
881	+	* exceptionally with that exception
882	+	*/
883		public void testExceptionally_exceptionalCompletionActionFailed() {
884		for (boolean createIncomplete : new boolean[] { true, false })
885		{
#	Line 962 | Line 898 | public class CompletableFutureTest exten
898		if (createIncomplete) f.completeExceptionally(ex1);
899
900		checkCompletedWithWrappedException(g, ex2);
901	+	checkCompletedExceptionally(f, ex1);
902		assertEquals(1, a.get());
903		}}
904
#	Line 969 | Line 906 | public class CompletableFutureTest exten
906		* whenComplete action executes on normal completion, propagating
907		* source result.
908		*/
909	<	public void testWhenComplete_normalCompletion1() {
909	>	public void testWhenComplete_normalCompletion() {
910		for (ExecutionMode m : ExecutionMode.values())
911		for (boolean createIncomplete : new boolean[] { true, false })
912		for (Integer v1 : new Integer[] { 1, null })
#	Line 979 | Line 916 | public class CompletableFutureTest exten
916		if (!createIncomplete) assertTrue(f.complete(v1));
917		final CompletableFuture<Integer> g = m.whenComplete
918		(f,
919	<	(Integer x, Throwable t) -> {
919	>	(Integer result, Throwable t) -> {
920		m.checkExecutionMode();
921	<	threadAssertSame(x, v1);
921	>	threadAssertSame(result, v1);
922		threadAssertNull(t);
923		a.getAndIncrement();
924		});
#	Line 1006 | Line 943 | public class CompletableFutureTest exten
943		if (!createIncomplete) f.completeExceptionally(ex);
944		final CompletableFuture<Integer> g = m.whenComplete
945		(f,
946	<	(Integer x, Throwable t) -> {
946	>	(Integer result, Throwable t) -> {
947		m.checkExecutionMode();
948	<	threadAssertNull(x);
948	>	threadAssertNull(result);
949		threadAssertSame(t, ex);
950		a.getAndIncrement();
951		});
#	Line 1033 | Line 970 | public class CompletableFutureTest exten
970		if (!createIncomplete) assertTrue(f.cancel(mayInterruptIfRunning));
971		final CompletableFuture<Integer> g = m.whenComplete
972		(f,
973	<	(Integer x, Throwable t) -> {
973	>	(Integer result, Throwable t) -> {
974		m.checkExecutionMode();
975	<	threadAssertNull(x);
975	>	threadAssertNull(result);
976		threadAssertTrue(t instanceof CancellationException);
977		a.getAndIncrement();
978		});
#	Line 1050 | Line 987 | public class CompletableFutureTest exten
987		* If a whenComplete action throws an exception when triggered by
988		* a normal completion, it completes exceptionally
989		*/
990	<	public void testWhenComplete_actionFailed() {
990	>	public void testWhenComplete_sourceCompletedNormallyActionFailed() {
991		for (boolean createIncomplete : new boolean[] { true, false })
992		for (ExecutionMode m : ExecutionMode.values())
993		for (Integer v1 : new Integer[] { 1, null })
#	Line 1061 | Line 998 | public class CompletableFutureTest exten
998		if (!createIncomplete) assertTrue(f.complete(v1));
999		final CompletableFuture<Integer> g = m.whenComplete
1000		(f,
1001	<	(Integer x, Throwable t) -> {
1001	>	(Integer result, Throwable t) -> {
1002		m.checkExecutionMode();
1003	<	threadAssertSame(x, v1);
1003	>	threadAssertSame(result, v1);
1004		threadAssertNull(t);
1005		a.getAndIncrement();
1006		throw ex;
#	Line 1078 | Line 1015 | public class CompletableFutureTest exten
1015		/**
1016		* If a whenComplete action throws an exception when triggered by
1017		* a source completion that also throws an exception, the source
1018	<	* exception takes precedence.
1018	>	* exception takes precedence (unlike handle)
1019		*/
1020	<	public void testWhenComplete_actionFailedSourceFailed() {
1020	>	public void testWhenComplete_sourceFailedActionFailed() {
1021		for (boolean createIncomplete : new boolean[] { true, false })
1022		for (ExecutionMode m : ExecutionMode.values())
1023		{
#	Line 1092 | Line 1029 | public class CompletableFutureTest exten
1029		if (!createIncomplete) f.completeExceptionally(ex1);
1030		final CompletableFuture<Integer> g = m.whenComplete
1031		(f,
1032	<	(Integer x, Throwable t) -> {
1032	>	(Integer result, Throwable t) -> {
1033		m.checkExecutionMode();
1034		threadAssertSame(t, ex1);
1035	<	threadAssertNull(x);
1035	>	threadAssertNull(result);
1036		a.getAndIncrement();
1037		throw ex2;
1038		});
#	Line 1103 | Line 1040 | public class CompletableFutureTest exten
1040
1041		checkCompletedWithWrappedException(g, ex1);
1042		checkCompletedExceptionally(f, ex1);
1043	+	if (testImplementationDetails) {
1044	+	assertEquals(1, ex1.getSuppressed().length);
1045	+	assertSame(ex2, ex1.getSuppressed()[0]);
1046	+	}
1047		assertEquals(1, a.get());
1048		}}
1049
#	Line 1120 | Line 1061 | public class CompletableFutureTest exten
1061		if (!createIncomplete) assertTrue(f.complete(v1));
1062		final CompletableFuture<Integer> g = m.handle
1063		(f,
1064	<	(Integer x, Throwable t) -> {
1064	>	(Integer result, Throwable t) -> {
1065		m.checkExecutionMode();
1066	<	threadAssertSame(x, v1);
1066	>	threadAssertSame(result, v1);
1067		threadAssertNull(t);
1068		a.getAndIncrement();
1069		return inc(v1);
#	Line 1149 | Line 1090 | public class CompletableFutureTest exten
1090		if (!createIncomplete) f.completeExceptionally(ex);
1091		final CompletableFuture<Integer> g = m.handle
1092		(f,
1093	<	(Integer x, Throwable t) -> {
1093	>	(Integer result, Throwable t) -> {
1094		m.checkExecutionMode();
1095	<	threadAssertNull(x);
1095	>	threadAssertNull(result);
1096		threadAssertSame(t, ex);
1097		a.getAndIncrement();
1098		return v1;
#	Line 1178 | Line 1119 | public class CompletableFutureTest exten
1119		if (!createIncomplete) assertTrue(f.cancel(mayInterruptIfRunning));
1120		final CompletableFuture<Integer> g = m.handle
1121		(f,
1122	<	(Integer x, Throwable t) -> {
1122	>	(Integer result, Throwable t) -> {
1123		m.checkExecutionMode();
1124	<	threadAssertNull(x);
1124	>	threadAssertNull(result);
1125		threadAssertTrue(t instanceof CancellationException);
1126		a.getAndIncrement();
1127		return v1;
#	Line 1193 | Line 1134 | public class CompletableFutureTest exten
1134		}}
1135
1136		/**
1137	<	* handle result completes exceptionally if action does
1137	>	* If a "handle action" throws an exception when triggered by
1138	>	* a normal completion, it completes exceptionally
1139		*/
1140	<	public void testHandle_sourceFailedActionFailed() {
1140	>	public void testHandle_sourceCompletedNormallyActionFailed() {
1141		for (ExecutionMode m : ExecutionMode.values())
1142		for (boolean createIncomplete : new boolean[] { true, false })
1143	+	for (Integer v1 : new Integer[] { 1, null })
1144		{
1145		final CompletableFuture<Integer> f = new CompletableFuture<>();
1146		final AtomicInteger a = new AtomicInteger(0);
1147	<	final CFException ex1 = new CFException();
1148	<	final CFException ex2 = new CFException();
1206	<	if (!createIncomplete) f.completeExceptionally(ex1);
1147	>	final CFException ex = new CFException();
1148	>	if (!createIncomplete) assertTrue(f.complete(v1));
1149		final CompletableFuture<Integer> g = m.handle
1150		(f,
1151	<	(Integer x, Throwable t) -> {
1151	>	(Integer result, Throwable t) -> {
1152		m.checkExecutionMode();
1153	<	threadAssertNull(x);
1154	<	threadAssertSame(ex1, t);
1153	>	threadAssertSame(result, v1);
1154	>	threadAssertNull(t);
1155		a.getAndIncrement();
1156	<	throw ex2;
1156	>	throw ex;
1157		});
1158	<	if (createIncomplete) f.completeExceptionally(ex1);
1158	>	if (createIncomplete) assertTrue(f.complete(v1));
1159
1160	<	checkCompletedWithWrappedException(g, ex2);
1161	<	checkCompletedExceptionally(f, ex1);
1160	>	checkCompletedWithWrappedException(g, ex);
1161	>	checkCompletedNormally(f, v1);
1162		assertEquals(1, a.get());
1163		}}
1164
1165	<	public void testHandle_sourceCompletedNormallyActionFailed() {
1166	<	for (ExecutionMode m : ExecutionMode.values())
1165	>	/**
1166	>	* If a "handle action" throws an exception when triggered by
1167	>	* a source completion that also throws an exception, the action
1168	>	* exception takes precedence (unlike whenComplete)
1169	>	*/
1170	>	public void testHandle_sourceFailedActionFailed() {
1171		for (boolean createIncomplete : new boolean[] { true, false })
1172	<	for (Integer v1 : new Integer[] { 1, null })
1172	>	for (ExecutionMode m : ExecutionMode.values())
1173		{
1228	–	final CompletableFuture<Integer> f = new CompletableFuture<>();
1174		final AtomicInteger a = new AtomicInteger(0);
1175	<	final CFException ex = new CFException();
1176	<	if (!createIncomplete) assertTrue(f.complete(v1));
1175	>	final CFException ex1 = new CFException();
1176	>	final CFException ex2 = new CFException();
1177	>	final CompletableFuture<Integer> f = new CompletableFuture<>();
1178	>
1179	>	if (!createIncomplete) f.completeExceptionally(ex1);
1180		final CompletableFuture<Integer> g = m.handle
1181		(f,
1182	<	(Integer x, Throwable t) -> {
1182	>	(Integer result, Throwable t) -> {
1183		m.checkExecutionMode();
1184	<	threadAssertSame(x, v1);
1185	<	threadAssertNull(t);
1184	>	threadAssertNull(result);
1185	>	threadAssertSame(ex1, t);
1186		a.getAndIncrement();
1187	<	throw ex;
1187	>	throw ex2;
1188		});
1189	<	if (createIncomplete) assertTrue(f.complete(v1));
1189	>	if (createIncomplete) f.completeExceptionally(ex1);
1190
1191	<	checkCompletedWithWrappedException(g, ex);
1192	<	checkCompletedNormally(f, v1);
1191	>	checkCompletedWithWrappedException(g, ex2);
1192	>	checkCompletedExceptionally(f, ex1);
1193		assertEquals(1, a.get());
1194		}}
1195
#	Line 3142 | Line 3090 | public class CompletableFutureTest exten
3090		for (int i = 0; i < k; i++) {
3091		checkIncomplete(f);
3092		checkIncomplete(CompletableFuture.allOf(fs));
3093	<	if (i != k/2) {
3093	>	if (i != k / 2) {
3094		fs[i].complete(i);
3095		checkCompletedNormally(fs[i], i);
3096		} else {
#	Line 3333 | Line 3281 | public class CompletableFutureTest exten
3281		() -> f.exceptionally(null),
3282
3283		() -> f.handle(null),
3284	+
3285		() -> CompletableFuture.allOf((CompletableFuture<?>)null),
3286		() -> CompletableFuture.allOf((CompletableFuture<?>[])null),
3287		() -> CompletableFuture.allOf(f, null),
#	Line 3344 | Line 3293 | public class CompletableFutureTest exten
3293		() -> CompletableFuture.anyOf(null, f),
3294
3295		() -> f.obtrudeException(null),
3296	+
3297	+	() -> CompletableFuture.delayedExecutor(1L, SECONDS, null),
3298	+	() -> CompletableFuture.delayedExecutor(1L, null, exec),
3299	+	() -> CompletableFuture.delayedExecutor(1L, null),
3300	+
3301	+	() -> f.orTimeout(1L, null),
3302	+	() -> f.completeOnTimeout(42, 1L, null),
3303	+
3304	+	() -> CompletableFuture.failedFuture(null),
3305	+	() -> CompletableFuture.failedStage(null),
3306		};
3307
3308		assertThrows(NullPointerException.class, throwingActions);
#	Line 3364 | Line 3323 | public class CompletableFutureTest exten
3323		* newIncompleteFuture returns an incomplete CompletableFuture
3324		*/
3325		public void testNewIncompleteFuture() {
3326	+	for (Integer v1 : new Integer[] { 1, null })
3327	+	{
3328		CompletableFuture<Integer> f = new CompletableFuture<>();
3329		CompletableFuture<Integer> g = f.newIncompleteFuture();
3330		checkIncomplete(f);
3331		checkIncomplete(g);
3332	<	}
3332	>	f.complete(v1);
3333	>	checkCompletedNormally(f, v1);
3334	>	checkIncomplete(g);
3335	>	g.complete(v1);
3336	>	checkCompletedNormally(g, v1);
3337	>	assertSame(g.getClass(), CompletableFuture.class);
3338	>	}}
3339
3340		/**
3341		* completedStage returns a completed CompletionStage
3342		*/
3343		public void testCompletedStage() {
3344	<	AtomicInteger x = new AtomicInteger();
3344	>	AtomicInteger x = new AtomicInteger(0);
3345		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3346		CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3347		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
#	Line 3384 | Line 3351 | public class CompletableFutureTest exten
3351
3352		/**
3353		* defaultExecutor by default returns the commonPool if
3354	<	* it supports at least one thread.
3354	>	* it supports more than one thread.
3355		*/
3356		public void testDefaultExecutor() {
3357		CompletableFuture<Integer> f = new CompletableFuture<>();
3358		Executor e = f.defaultExecutor();
3359	<	Executor c =  ForkJoinPool.commonPool();
3359	>	Executor c = ForkJoinPool.commonPool();
3360		if (ForkJoinPool.getCommonPoolParallelism() > 1)
3361		assertSame(e, c);
3362	+	else
3363	+	assertNotSame(e, c);
3364		}
3365
3366		/**
#	Line 3401 | Line 3370 | public class CompletableFutureTest exten
3370		public void testFailedFuture() {
3371		CFException ex = new CFException();
3372		CompletableFuture<Integer> f = CompletableFuture.failedFuture(ex);
3373	<	checkCompletedExceptionallyWithRootCause(f, ex);
3373	>	checkCompletedExceptionally(f, ex);
3374		}
3375
3376		/**
3377		* failedFuture(null) throws NPE
3378		*/
3379	<	public void testFailedFuture2() {
3379	>	public void testFailedFuture_null() {
3380		try {
3381		CompletableFuture<Integer> f = CompletableFuture.failedFuture(null);
3382		shouldThrow();
#	Line 3440 | Line 3409 | public class CompletableFutureTest exten
3409		CFException ex = new CFException();
3410		f.completeExceptionally(ex);
3411		checkCompletedExceptionally(f, ex);
3412	<	checkCompletedWithWrappedCFException(g);
3412	>	checkCompletedWithWrappedException(g, ex);
3413		}
3414
3415		/**
#	Line 3450 | Line 3419 | public class CompletableFutureTest exten
3419		public void testMinimalCompletionStage() {
3420		CompletableFuture<Integer> f = new CompletableFuture<>();
3421		CompletionStage<Integer> g = f.minimalCompletionStage();
3422	<	AtomicInteger x = new AtomicInteger();
3422	>	AtomicInteger x = new AtomicInteger(0);
3423		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3424		checkIncomplete(f);
3425		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
#	Line 3467 | Line 3436 | public class CompletableFutureTest exten
3436		public void testMinimalCompletionStage2() {
3437		CompletableFuture<Integer> f = new CompletableFuture<>();
3438		CompletionStage<Integer> g = f.minimalCompletionStage();
3439	<	AtomicInteger x = new AtomicInteger();
3439	>	AtomicInteger x = new AtomicInteger(0);
3440		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3441		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3442		checkIncomplete(f);
#	Line 3479 | Line 3448 | public class CompletableFutureTest exten
3448		}
3449
3450		/**
3451	<	* failedStage returns a Completionstage completed
3451	>	* failedStage returns a CompletionStage completed
3452		* exceptionally with the given Exception
3453		*/
3454		public void testFailedStage() {
3455		CFException ex = new CFException();
3456		CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3457	<	AtomicInteger x = new AtomicInteger();
3457	>	AtomicInteger x = new AtomicInteger(0);
3458		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3459		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3460		assertEquals(x.get(), 0);
3461	<	assertEquals(r.get().getCause(), ex);
3461	>	assertEquals(r.get(), ex);
3462		}
3463
3464		/**
3465		* completeAsync completes with value of given supplier
3466		*/
3467		public void testCompleteAsync() {
3468	+	for (Integer v1 : new Integer[] { 1, null })
3469	+	{
3470		CompletableFuture<Integer> f = new CompletableFuture<>();
3471	<	f.completeAsync(() -> 1);
3471	>	f.completeAsync(() -> v1);
3472		f.join();
3473	<	checkCompletedNormally(f, 1);
3474	<	}
3473	>	checkCompletedNormally(f, v1);
3474	>	}}
3475
3476		/**
3477		* completeAsync completes exceptionally if given supplier throws
#	Line 3512 | Line 3483 | public class CompletableFutureTest exten
3483		try {
3484		f.join();
3485		shouldThrow();
3486	<	} catch (Exception success) {}
3487	<	checkCompletedWithWrappedCFException(f);
3486	>	} catch (CompletionException success) {}
3487	>	checkCompletedWithWrappedException(f, ex);
3488		}
3489
3490		/**
3491		* completeAsync with given executor completes with value of given supplier
3492		*/
3493		public void testCompleteAsync3() {
3494	+	for (Integer v1 : new Integer[] { 1, null })
3495	+	{
3496		CompletableFuture<Integer> f = new CompletableFuture<>();
3497	<	f.completeAsync(() -> 1, new ThreadExecutor());
3498	<	f.join();
3499	<	checkCompletedNormally(f, 1);
3500	<	}
3497	>	ThreadExecutor executor = new ThreadExecutor();
3498	>	f.completeAsync(() -> v1, executor);
3499	>	assertSame(v1, f.join());
3500	>	checkCompletedNormally(f, v1);
3501	>	assertEquals(1, executor.count.get());
3502	>	}}
3503
3504		/**
3505		* completeAsync with given executor completes exceptionally if
#	Line 3533 | Line 3508 | public class CompletableFutureTest exten
3508		public void testCompleteAsync4() {
3509		CompletableFuture<Integer> f = new CompletableFuture<>();
3510		CFException ex = new CFException();
3511	<	f.completeAsync(() -> {if (true) throw ex; return 1;}, new ThreadExecutor());
3511	>	ThreadExecutor executor = new ThreadExecutor();
3512	>	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3513		try {
3514		f.join();
3515		shouldThrow();
3516	<	} catch (Exception success) {}
3517	<	checkCompletedWithWrappedCFException(f);
3516	>	} catch (CompletionException success) {}
3517	>	checkCompletedWithWrappedException(f, ex);
3518	>	assertEquals(1, executor.count.get());
3519		}
3520
3521		/**
3522	<	*  orTimeout completes with TimeoutException if not complete
3522	>	* orTimeout completes with TimeoutException if not complete
3523		*/
3524	<	public void testOrTimeout() {
3524	>	public void testOrTimeout_timesOut() {
3525	>	long timeoutMillis = timeoutMillis();
3526		CompletableFuture<Integer> f = new CompletableFuture<>();
3527	<	f.orTimeout(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3528	<	checkCompletedExceptionallyWithTimeout(f);
3527	>	long startTime = System.nanoTime();
3528	>	assertSame(f, f.orTimeout(timeoutMillis, MILLISECONDS));
3529	>	checkCompletedWithTimeoutException(f);
3530	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3531		}
3532
3533		/**
3534	<	*  orTimeout completes normally if completed before timeout
3534	>	* orTimeout completes normally if completed before timeout
3535		*/
3536	<	public void testOrTimeout2() {
3536	>	public void testOrTimeout_completed() {
3537	>	for (Integer v1 : new Integer[] { 1, null })
3538	>	{
3539		CompletableFuture<Integer> f = new CompletableFuture<>();
3540	<	f.complete(1);
3541	<	f.orTimeout(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3542	<	checkCompletedNormally(f, 1);
3543	<	}
3540	>	CompletableFuture<Integer> g = new CompletableFuture<>();
3541	>	long startTime = System.nanoTime();
3542	>	f.complete(v1);
3543	>	assertSame(f, f.orTimeout(LONG_DELAY_MS, MILLISECONDS));
3544	>	assertSame(g, g.orTimeout(LONG_DELAY_MS, MILLISECONDS));
3545	>	g.complete(v1);
3546	>	checkCompletedNormally(f, v1);
3547	>	checkCompletedNormally(g, v1);
3548	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3549	>	}}
3550
3551		/**
3552	<	*  completeOnTimeout completes with given value if not complete
3552	>	* completeOnTimeout completes with given value if not complete
3553		*/
3554	<	public void testCompleteOnTimeout() {
3555	<	CompletableFuture<Integer> f = new CompletableFuture<>();
3556	<	f.completeOnTimeout(-1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3569	<	f.join();
3570	<	checkCompletedNormally(f, -1);
3554	>	public void testCompleteOnTimeout_timesOut() {
3555	>	testInParallel(() -> testCompleteOnTimeout_timesOut(42),
3556	>	() -> testCompleteOnTimeout_timesOut(null));
3557		}
3558
3559		/**
3560	<	*  completeOnTimeout has no effect if completed within timeout
3560	>	* completeOnTimeout completes with given value if not complete
3561		*/
3562	<	public void testCompleteOnTimeout2() {
3562	>	public void testCompleteOnTimeout_timesOut(Integer v) {
3563	>	long timeoutMillis = timeoutMillis();
3564		CompletableFuture<Integer> f = new CompletableFuture<>();
3565	<	f.complete(1);
3566	<	f.completeOnTimeout(-1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3567	<	checkCompletedNormally(f, 1);
3565	>	long startTime = System.nanoTime();
3566	>	assertSame(f, f.completeOnTimeout(v, timeoutMillis, MILLISECONDS));
3567	>	assertSame(v, f.join());
3568	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3569	>	f.complete(99);         // should have no effect
3570	>	checkCompletedNormally(f, v);
3571		}
3572
3573		/**
3574	<	* delayedExecutor returns an executor that delays submission
3574	>	* completeOnTimeout has no effect if completed within timeout
3575		*/
3576	<	public void testDelayedExecutor() {
3577	<	long timeoutMillis = SMALL_DELAY_MS;
3578	<	Executor d = CompletableFuture.delayedExecutor(timeoutMillis,
3579	<	MILLISECONDS);
3576	>	public void testCompleteOnTimeout_completed() {
3577	>	for (Integer v1 : new Integer[] { 1, null })
3578	>	{
3579	>	CompletableFuture<Integer> f = new CompletableFuture<>();
3580	>	CompletableFuture<Integer> g = new CompletableFuture<>();
3581		long startTime = System.nanoTime();
3582	<	CompletableFuture<Integer> f = CompletableFuture.supplyAsync(() -> 1, d);
3583	<	assertNull(f.getNow(null));
3584	<	try {
3585	<	f.get(LONG_DELAY_MS, MILLISECONDS);
3586	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
3587	<	assertTrue(millisElapsedSince(startTime) > timeoutMillis/2);
3588	<	checkCompletedNormally(f, 1);
3589	<	}
3582	>	f.complete(v1);
3583	>	assertSame(f, f.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS));
3584	>	assertSame(g, g.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS));
3585	>	g.complete(v1);
3586	>	checkCompletedNormally(f, v1);
3587	>	checkCompletedNormally(g, v1);
3588	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3589	>	}}
3590
3591		/**
3592	<	* delayedExecutor for a given executor returns an executor that
3602	<	* delays submission
3592	>	* delayedExecutor returns an executor that delays submission
3593		*/
3594	<	public void testDelayedExecutor2() {
3595	<	long timeoutMillis = SMALL_DELAY_MS;
3596	<	Executor d = CompletableFuture.delayedExecutor(timeoutMillis,
3597	<	MILLISECONDS,
3598	<	new ThreadExecutor());
3594	>	public void testDelayedExecutor() {
3595	>	testInParallel(() -> testDelayedExecutor(null, null),
3596	>	() -> testDelayedExecutor(null, 1),
3597	>	() -> testDelayedExecutor(new ThreadExecutor(), 1),
3598	>	() -> testDelayedExecutor(new ThreadExecutor(), 1));
3599	>	}
3600	>
3601	>	public void testDelayedExecutor(Executor executor, Integer v) throws Exception {
3602	>	long timeoutMillis = timeoutMillis();
3603	>	// Use an "unreasonably long" long timeout to catch lingering threads
3604	>	long longTimeoutMillis = 1000 * 60 * 60 * 24;
3605	>	final Executor delayer, longDelayer;
3606	>	if (executor == null) {
3607	>	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS);
3608	>	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS);
3609	>	} else {
3610	>	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS, executor);
3611	>	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS, executor);
3612	>	}
3613		long startTime = System.nanoTime();
3614	<	CompletableFuture<Integer> f = CompletableFuture.supplyAsync(() -> 1, d);
3615	<	assertNull(f.getNow(null));
3616	<	try {
3617	<	f.get(LONG_DELAY_MS, MILLISECONDS);
3618	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
3619	<	assertTrue(millisElapsedSince(startTime) > timeoutMillis/2);
3620	<	checkCompletedNormally(f, 1);
3614	>	CompletableFuture<Integer> f =
3615	>	CompletableFuture.supplyAsync(() -> v, delayer);
3616	>	CompletableFuture<Integer> g =
3617	>	CompletableFuture.supplyAsync(() -> v, longDelayer);
3618	>
3619	>	assertNull(g.getNow(null));
3620	>
3621	>	assertSame(v, f.get(LONG_DELAY_MS, MILLISECONDS));
3622	>	long millisElapsed = millisElapsedSince(startTime);
3623	>	assertTrue(millisElapsed >= timeoutMillis);
3624	>	assertTrue(millisElapsed < LONG_DELAY_MS / 2);
3625	>
3626	>	checkCompletedNormally(f, v);
3627	>
3628	>	checkIncomplete(g);
3629	>	assertTrue(g.cancel(true));
3630		}
3631
3632		//--- tests of implementation details; not part of official tck ---
#	Line 3650 | Line 3663 | public class CompletableFutureTest exten
3663		funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3664		funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
3665
3666	<	funs.add((y) -> m.whenComplete(y, (Integer x, Throwable t) -> {}));
3666	>	funs.add((y) -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3667
3668		funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3669
#	Line 3706 | Line 3719 | public class CompletableFutureTest exten
3719		}
3720		}}
3721
3722	+	/**
3723	+	* Minimal completion stages throw UOE for all non-CompletionStage methods
3724	+	*/
3725	+	public void testMinimalCompletionStage_minimality() {
3726	+	if (!testImplementationDetails) return;
3727	+	Function<Method, String> toSignature =
3728	+	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3729	+	Predicate<Method> isNotStatic =
3730	+	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3731	+	List<Method> minimalMethods =
3732	+	Stream.of(Object.class, CompletionStage.class)
3733	+	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3734	+	.filter(isNotStatic)
3735	+	.collect(Collectors.toList());
3736	+	// Methods from CompletableFuture permitted NOT to throw UOE
3737	+	String[] signatureWhitelist = {
3738	+	"newIncompleteFuture[]",
3739	+	"defaultExecutor[]",
3740	+	"minimalCompletionStage[]",
3741	+	"copy[]",
3742	+	};
3743	+	Set<String> permittedMethodSignatures =
3744	+	Stream.concat(minimalMethods.stream().map(toSignature),
3745	+	Stream.of(signatureWhitelist))
3746	+	.collect(Collectors.toSet());
3747	+	List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
3748	+	.filter(isNotStatic)
3749	+	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3750	+	.collect(Collectors.toList());
3751	+
3752	+	CompletionStage<Integer> minimalStage =
3753	+	new CompletableFuture<Integer>().minimalCompletionStage();
3754	+
3755	+	List<Method> bugs = new ArrayList<>();
3756	+	for (Method method : allMethods) {
3757	+	Class<?>[] parameterTypes = method.getParameterTypes();
3758	+	Object[] args = new Object[parameterTypes.length];
3759	+	// Manufacture boxed primitives for primitive params
3760	+	for (int i = 0; i < args.length; i++) {
3761	+	Class<?> type = parameterTypes[i];
3762	+	if (parameterTypes[i] == boolean.class)
3763	+	args[i] = false;
3764	+	else if (parameterTypes[i] == int.class)
3765	+	args[i] = 0;
3766	+	else if (parameterTypes[i] == long.class)
3767	+	args[i] = 0L;
3768	+	}
3769	+	try {
3770	+	method.invoke(minimalStage, args);
3771	+	bugs.add(method);
3772	+	}
3773	+	catch (java.lang.reflect.InvocationTargetException expected) {
3774	+	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
3775	+	bugs.add(method);
3776	+	// expected.getCause().printStackTrace();
3777	+	}
3778	+	}
3779	+	catch (ReflectiveOperationException bad) { throw new Error(bad); }
3780	+	}
3781	+	if (!bugs.isEmpty())
3782	+	throw new Error("Methods did not throw UOE: " + bugs.toString());
3783	+	}
3784	+
3785	+	static class Monad {
3786	+	static class ZeroException extends RuntimeException {
3787	+	public ZeroException() { super("monadic zero"); }
3788	+	}
3789	+	// "return", "unit"
3790	+	static <T> CompletableFuture<T> unit(T value) {
3791	+	return completedFuture(value);
3792	+	}
3793	+	// monadic zero ?
3794	+	static <T> CompletableFuture<T> zero() {
3795	+	return failedFuture(new ZeroException());
3796	+	}
3797	+	// >=>
3798	+	static <T,U,V> Function<T, CompletableFuture<V>> compose
3799	+	(Function<T, CompletableFuture<U>> f,
3800	+	Function<U, CompletableFuture<V>> g) {
3801	+	return (x) -> f.apply(x).thenCompose(g);
3802	+	}
3803	+
3804	+	static void assertZero(CompletableFuture<?> f) {
3805	+	try {
3806	+	f.getNow(null);
3807	+	throw new AssertionFailedError("should throw");
3808	+	} catch (CompletionException success) {
3809	+	assertTrue(success.getCause() instanceof ZeroException);
3810	+	}
3811	+	}
3812	+
3813	+	static <T> void assertFutureEquals(CompletableFuture<T> f,
3814	+	CompletableFuture<T> g) {
3815	+	T fval = null, gval = null;
3816	+	Throwable fex = null, gex = null;
3817	+
3818	+	try { fval = f.get(); }
3819	+	catch (ExecutionException ex) { fex = ex.getCause(); }
3820	+	catch (Throwable ex) { fex = ex; }
3821	+
3822	+	try { gval = g.get(); }
3823	+	catch (ExecutionException ex) { gex = ex.getCause(); }
3824	+	catch (Throwable ex) { gex = ex; }
3825	+
3826	+	if (fex != null || gex != null)
3827	+	assertSame(fex.getClass(), gex.getClass());
3828	+	else
3829	+	assertEquals(fval, gval);
3830	+	}
3831	+
3832	+	static class PlusFuture<T> extends CompletableFuture<T> {
3833	+	AtomicReference<Throwable> firstFailure = new AtomicReference<>(null);
3834	+	}
3835	+
3836	+	/** Implements "monadic plus". */
3837	+	static <T> CompletableFuture<T> plus(CompletableFuture<? extends T> f,
3838	+	CompletableFuture<? extends T> g) {
3839	+	PlusFuture<T> plus = new PlusFuture<T>();
3840	+	BiConsumer<T, Throwable> action = (T result, Throwable ex) -> {
3841	+	try {
3842	+	if (ex == null) {
3843	+	if (plus.complete(result))
3844	+	if (plus.firstFailure.get() != null)
3845	+	plus.firstFailure.set(null);
3846	+	}
3847	+	else if (plus.firstFailure.compareAndSet(null, ex)) {
3848	+	if (plus.isDone())
3849	+	plus.firstFailure.set(null);
3850	+	}
3851	+	else {
3852	+	// first failure has precedence
3853	+	Throwable first = plus.firstFailure.getAndSet(null);
3854	+
3855	+	// may fail with "Self-suppression not permitted"
3856	+	try { first.addSuppressed(ex); }
3857	+	catch (Exception ignored) {}
3858	+
3859	+	plus.completeExceptionally(first);
3860	+	}
3861	+	} catch (Throwable unexpected) {
3862	+	plus.completeExceptionally(unexpected);
3863	+	}
3864	+	};
3865	+	f.whenComplete(action);
3866	+	g.whenComplete(action);
3867	+	return plus;
3868	+	}
3869	+	}
3870	+
3871	+	/**
3872	+	* CompletableFuture is an additive monad - sort of.
3873	+	* https://en.wikipedia.org/wiki/Monad_(functional_programming)#Additive_monads
3874	+	*/
3875	+	public void testAdditiveMonad() throws Throwable {
3876	+	Function<Long, CompletableFuture<Long>> unit = Monad::unit;
3877	+	CompletableFuture<Long> zero = Monad.zero();
3878	+
3879	+	// Some mutually non-commutative functions
3880	+	Function<Long, CompletableFuture<Long>> triple
3881	+	= (x) -> Monad.unit(3 * x);
3882	+	Function<Long, CompletableFuture<Long>> inc
3883	+	= (x) -> Monad.unit(x + 1);
3884	+
3885	+	// unit is a right identity: m >>= unit === m
3886	+	Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
3887	+	inc.apply(5L));
3888	+	// unit is a left identity: (unit x) >>= f === f x
3889	+	Monad.assertFutureEquals(unit.apply(5L).thenCompose(inc),
3890	+	inc.apply(5L));
3891	+
3892	+	// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
3893	+	Monad.assertFutureEquals(
3894	+	unit.apply(5L).thenCompose(inc).thenCompose(triple),
3895	+	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
3896	+
3897	+	// The case for CompletableFuture as an additive monad is weaker...
3898	+
3899	+	// zero is a monadic zero
3900	+	Monad.assertZero(zero);
3901	+
3902	+	// left zero: zero >>= f === zero
3903	+	Monad.assertZero(zero.thenCompose(inc));
3904	+	// right zero: f >>= (\x -> zero) === zero
3905	+	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
3906	+
3907	+	// f plus zero === f
3908	+	Monad.assertFutureEquals(Monad.unit(5L),
3909	+	Monad.plus(Monad.unit(5L), zero));
3910	+	// zero plus f === f
3911	+	Monad.assertFutureEquals(Monad.unit(5L),
3912	+	Monad.plus(zero, Monad.unit(5L)));
3913	+	// zero plus zero === zero
3914	+	Monad.assertZero(Monad.plus(zero, zero));
3915	+	{
3916	+	CompletableFuture<Long> f = Monad.plus(Monad.unit(5L),
3917	+	Monad.unit(8L));
3918	+	// non-determinism
3919	+	assertTrue(f.get() == 5L || f.get() == 8L);
3920	+	}
3921	+
3922	+	CompletableFuture<Long> godot = new CompletableFuture<>();
3923	+	// f plus godot === f (doesn't wait for godot)
3924	+	Monad.assertFutureEquals(Monad.unit(5L),
3925	+	Monad.plus(Monad.unit(5L), godot));
3926	+	// godot plus f === f (doesn't wait for godot)
3927	+	Monad.assertFutureEquals(Monad.unit(5L),
3928	+	Monad.plus(godot, Monad.unit(5L)));
3929	+	}
3930	+
3931	+	/**
3932	+	* A single CompletableFuture with many dependents.
3933	+	* A demo of scalability - runtime is O(n).
3934	+	*/
3935	+	public void testManyDependents() throws Throwable {
3936	+	final int n = 1_000;
3937	+	final CompletableFuture<Void> head = new CompletableFuture<>();
3938	+	final CompletableFuture<Void> complete = CompletableFuture.completedFuture((Void)null);
3939	+	final AtomicInteger count = new AtomicInteger(0);
3940	+	for (int i = 0; i < n; i++) {
3941	+	head.thenRun(() -> count.getAndIncrement());
3942	+	head.thenAccept((x) -> count.getAndIncrement());
3943	+	head.thenApply((x) -> count.getAndIncrement());
3944	+
3945	+	head.runAfterBoth(complete, () -> count.getAndIncrement());
3946	+	head.thenAcceptBoth(complete, (x, y) -> count.getAndIncrement());
3947	+	head.thenCombine(complete, (x, y) -> count.getAndIncrement());
3948	+	complete.runAfterBoth(head, () -> count.getAndIncrement());
3949	+	complete.thenAcceptBoth(head, (x, y) -> count.getAndIncrement());
3950	+	complete.thenCombine(head, (x, y) -> count.getAndIncrement());
3951	+
3952	+	head.runAfterEither(new CompletableFuture<Void>(), () -> count.getAndIncrement());
3953	+	head.acceptEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
3954	+	head.applyToEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
3955	+	new CompletableFuture<Void>().runAfterEither(head, () -> count.getAndIncrement());
3956	+	new CompletableFuture<Void>().acceptEither(head, (x) -> count.getAndIncrement());
3957	+	new CompletableFuture<Void>().applyToEither(head, (x) -> count.getAndIncrement());
3958	+	}
3959	+	head.complete(null);
3960	+	assertEquals(5 * 3 * n, count.get());
3961	+	}
3962	+
3963	+	//     static <U> U join(CompletionStage<U> stage) {
3964	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3965	+	//         stage.whenComplete((v, ex) -> {
3966	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3967	+	//         });
3968	+	//         return f.join();
3969	+	//     }
3970	+
3971	+	//     static <U> boolean isDone(CompletionStage<U> stage) {
3972	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3973	+	//         stage.whenComplete((v, ex) -> {
3974	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3975	+	//         });
3976	+	//         return f.isDone();
3977	+	//     }
3978	+
3979	+	//     static <U> U join2(CompletionStage<U> stage) {
3980	+	//         return stage.toCompletableFuture().copy().join();
3981	+	//     }
3982	+
3983	+	//     static <U> boolean isDone2(CompletionStage<U> stage) {
3984	+	//         return stage.toCompletableFuture().copy().isDone();
3985	+	//     }
3986	+
3987		}

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