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root/jsr166/jsr166/src/test/tck/JSR166TestCase.java

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.143 by jsr166, Sun Sep 13 16:28:14 2015 UTC vs.
Revision 1.229 by jsr166, Sun May 14 03:15:37 2017 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by Doug Lea with assistance from members of JCP JSR-166
3	<	* Expert Group and released to the public domain, as explained at
2	>	* Written by Doug Lea and Martin Buchholz with assistance from
3	>	* members of JCP JSR-166 Expert Group and released to the public
4	>	* domain, as explained at
5		* http://creativecommons.org/publicdomain/zero/1.0/
6		* Other contributors include Andrew Wright, Jeffrey Hayes,
7		* Pat Fisher, Mike Judd.
8		*/
9
10	+	/*
11	+	* @test
12	+	* @summary JSR-166 tck tests, in a number of variations.
13	+	*          The first is the conformance testing variant,
14	+	*          while others also test implementation details.
15	+	* @build *
16	+	* @modules java.management
17	+	* @run junit/othervm/timeout=1000 JSR166TestCase
18	+	* @run junit/othervm/timeout=1000
19	+	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
20	+	*      --add-opens java.base/java.lang=ALL-UNNAMED
21	+	*      -Djsr166.testImplementationDetails=true
22	+	*      JSR166TestCase
23	+	* @run junit/othervm/timeout=1000
24	+	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
25	+	*      --add-opens java.base/java.lang=ALL-UNNAMED
26	+	*      -Djsr166.testImplementationDetails=true
27	+	*      -Djava.util.concurrent.ForkJoinPool.common.parallelism=0
28	+	*      JSR166TestCase
29	+	* @run junit/othervm/timeout=1000
30	+	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
31	+	*      --add-opens java.base/java.lang=ALL-UNNAMED
32	+	*      -Djsr166.testImplementationDetails=true
33	+	*      -Djava.util.concurrent.ForkJoinPool.common.parallelism=1
34	+	*      -Djava.util.secureRandomSeed=true
35	+	*      JSR166TestCase
36	+	* @run junit/othervm/timeout=1000/policy=tck.policy
37	+	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
38	+	*      --add-opens java.base/java.lang=ALL-UNNAMED
39	+	*      -Djsr166.testImplementationDetails=true
40	+	*      JSR166TestCase
41	+	*/
42	+
43		import static java.util.concurrent.TimeUnit.MILLISECONDS;
44	+	import static java.util.concurrent.TimeUnit.MINUTES;
45		import static java.util.concurrent.TimeUnit.NANOSECONDS;
46
47		import java.io.ByteArrayInputStream;
#	Line 15 | Line 50 | import java.io.ObjectInputStream;
50		import java.io.ObjectOutputStream;
51		import java.lang.management.ManagementFactory;
52		import java.lang.management.ThreadInfo;
53	+	import java.lang.management.ThreadMXBean;
54		import java.lang.reflect.Constructor;
55		import java.lang.reflect.Method;
56		import java.lang.reflect.Modifier;
#	Line 27 | Line 63 | import java.security.ProtectionDomain;
63		import java.security.SecurityPermission;
64		import java.util.ArrayList;
65		import java.util.Arrays;
66	+	import java.util.Collection;
67	+	import java.util.Collections;
68		import java.util.Date;
69		import java.util.Enumeration;
70		import java.util.Iterator;
#	Line 40 | Line 78 | import java.util.concurrent.CyclicBarrie
78		import java.util.concurrent.ExecutionException;
79		import java.util.concurrent.Executors;
80		import java.util.concurrent.ExecutorService;
81	+	import java.util.concurrent.ForkJoinPool;
82		import java.util.concurrent.Future;
83		import java.util.concurrent.RecursiveAction;
84		import java.util.concurrent.RecursiveTask;
85		import java.util.concurrent.RejectedExecutionHandler;
86		import java.util.concurrent.Semaphore;
87	+	import java.util.concurrent.SynchronousQueue;
88		import java.util.concurrent.ThreadFactory;
89	+	import java.util.concurrent.ThreadLocalRandom;
90		import java.util.concurrent.ThreadPoolExecutor;
91		import java.util.concurrent.TimeoutException;
92	+	import java.util.concurrent.atomic.AtomicBoolean;
93		import java.util.concurrent.atomic.AtomicReference;
94		import java.util.regex.Pattern;
95
#	Line 106 | Line 148 | import junit.framework.TestSuite;
148		* methods as there are exceptions the method can throw. Sometimes
149		* there are multiple tests per JSR166 method when the different
150		* "normal" behaviors differ significantly. And sometimes testcases
151	<	* cover multiple methods when they cannot be tested in
110	<	* isolation.
151	>	* cover multiple methods when they cannot be tested in isolation.
152		*
153		* <li>The documentation style for testcases is to provide as javadoc
154		* a simple sentence or two describing the property that the testcase
#	Line 170 | Line 211 | public class JSR166TestCase extends Test
211		private static final int suiteRuns =
212		Integer.getInteger("jsr166.suiteRuns", 1);
213
214	+	/**
215	+	* Returns the value of the system property, or NaN if not defined.
216	+	*/
217	+	private static float systemPropertyValue(String name) {
218	+	String floatString = System.getProperty(name);
219	+	if (floatString == null)
220	+	return Float.NaN;
221	+	try {
222	+	return Float.parseFloat(floatString);
223	+	} catch (NumberFormatException ex) {
224	+	throw new IllegalArgumentException(
225	+	String.format("Bad float value in system property %s=%s",
226	+	name, floatString));
227	+	}
228	+	}
229	+
230	+	/**
231	+	* The scaling factor to apply to standard delays used in tests.
232	+	* May be initialized from any of:
233	+	* - the "jsr166.delay.factor" system property
234	+	* - the "test.timeout.factor" system property (as used by jtreg)
235	+	*   See: http://openjdk.java.net/jtreg/tag-spec.html
236	+	* - hard-coded fuzz factor when using a known slowpoke VM
237	+	*/
238	+	private static final float delayFactor = delayFactor();
239	+
240	+	private static float delayFactor() {
241	+	float x;
242	+	if (!Float.isNaN(x = systemPropertyValue("jsr166.delay.factor")))
243	+	return x;
244	+	if (!Float.isNaN(x = systemPropertyValue("test.timeout.factor")))
245	+	return x;
246	+	String prop = System.getProperty("java.vm.version");
247	+	if (prop != null && prop.matches(".*debug.*"))
248	+	return 4.0f; // How much slower is fastdebug than product?!
249	+	return 1.0f;
250	+	}
251	+
252		public JSR166TestCase() { super(); }
253		public JSR166TestCase(String name) { super(name); }
254
#	Line 185 | Line 264 | public class JSR166TestCase extends Test
264		return (regex == null) ? null : Pattern.compile(regex);
265		}
266
267	<	protected void runTest() throws Throwable {
267	>	// Instrumentation to debug very rare, but very annoying hung test runs.
268	>	static volatile TestCase currentTestCase;
269	>	// static volatile int currentRun = 0;
270	>	static {
271	>	Runnable checkForWedgedTest = new Runnable() { public void run() {
272	>	// Avoid spurious reports with enormous runsPerTest.
273	>	// A single test case run should never take more than 1 second.
274	>	// But let's cap it at the high end too ...
275	>	final int timeoutMinutes =
276	>	Math.min(15, Math.max(runsPerTest / 60, 1));
277	>	for (TestCase lastTestCase = currentTestCase;;) {
278	>	try { MINUTES.sleep(timeoutMinutes); }
279	>	catch (InterruptedException unexpected) { break; }
280	>	if (lastTestCase == currentTestCase) {
281	>	System.err.printf(
282	>	"Looks like we're stuck running test: %s%n",
283	>	lastTestCase);
284	>	//                     System.err.printf(
285	>	//                         "Looks like we're stuck running test: %s (%d/%d)%n",
286	>	//                         lastTestCase, currentRun, runsPerTest);
287	>	//                     System.err.println("availableProcessors=" +
288	>	//                         Runtime.getRuntime().availableProcessors());
289	>	//                     System.err.printf("cpu model = %s%n", cpuModel());
290	>	dumpTestThreads();
291	>	// one stack dump is probably enough; more would be spam
292	>	break;
293	>	}
294	>	lastTestCase = currentTestCase;
295	>	}}};
296	>	Thread thread = new Thread(checkForWedgedTest, "checkForWedgedTest");
297	>	thread.setDaemon(true);
298	>	thread.start();
299	>	}
300	>
301	>	//     public static String cpuModel() {
302	>	//         try {
303	>	//             java.util.regex.Matcher matcher
304	>	//               = Pattern.compile("model name\\s*: (.*)")
305	>	//                 .matcher(new String(
306	>	//                     java.nio.file.Files.readAllBytes(
307	>	//                         java.nio.file.Paths.get("/proc/cpuinfo")), "UTF-8"));
308	>	//             matcher.find();
309	>	//             return matcher.group(1);
310	>	//         } catch (Exception ex) { return null; }
311	>	//     }
312	>
313	>	public void runBare() throws Throwable {
314	>	currentTestCase = this;
315		if (methodFilter == null
316	<	|| methodFilter.matcher(toString()).find()) {
317	<	for (int i = 0; i < runsPerTest; i++) {
318	<	if (profileTests)
319	<	runTestProfiled();
320	<	else
321	<	super.runTest();
322	<	}
316	>	|| methodFilter.matcher(toString()).find())
317	>	super.runBare();
318	>	}
319	>
320	>	protected void runTest() throws Throwable {
321	>	for (int i = 0; i < runsPerTest; i++) {
322	>	// currentRun = i;
323	>	if (profileTests)
324	>	runTestProfiled();
325	>	else
326	>	super.runTest();
327		}
328		}
329
330		protected void runTestProfiled() throws Throwable {
331	<	// Warmup run, notably to trigger all needed classloading.
332	<	super.runTest();
203	<	long t0 = System.nanoTime();
204	<	try {
331	>	for (int i = 0; i < 2; i++) {
332	>	long startTime = System.nanoTime();
333		super.runTest();
334	<	} finally {
335	<	long elapsedMillis = millisElapsedSince(t0);
336	<	if (elapsedMillis >= profileThreshold)
334	>	long elapsedMillis = millisElapsedSince(startTime);
335	>	if (elapsedMillis < profileThreshold)
336	>	break;
337	>	// Never report first run of any test; treat it as a
338	>	// warmup run, notably to trigger all needed classloading,
339	>	if (i > 0)
340		System.out.printf("%n%s: %d%n", toString(), elapsedMillis);
341		}
342		}
#	Line 217 | Line 348 | public class JSR166TestCase extends Test
348		main(suite(), args);
349		}
350
351	+	static class PithyResultPrinter extends junit.textui.ResultPrinter {
352	+	PithyResultPrinter(java.io.PrintStream writer) { super(writer); }
353	+	long runTime;
354	+	public void startTest(Test test) {}
355	+	protected void printHeader(long runTime) {
356	+	this.runTime = runTime; // defer printing for later
357	+	}
358	+	protected void printFooter(TestResult result) {
359	+	if (result.wasSuccessful()) {
360	+	getWriter().println("OK (" + result.runCount() + " tests)"
361	+	+ "  Time: " + elapsedTimeAsString(runTime));
362	+	} else {
363	+	getWriter().println("Time: " + elapsedTimeAsString(runTime));
364	+	super.printFooter(result);
365	+	}
366	+	}
367	+	}
368	+
369	+	/**
370	+	* Returns a TestRunner that doesn't bother with unnecessary
371	+	* fluff, like printing a "." for each test case.
372	+	*/
373	+	static junit.textui.TestRunner newPithyTestRunner() {
374	+	junit.textui.TestRunner runner = new junit.textui.TestRunner();
375	+	runner.setPrinter(new PithyResultPrinter(System.out));
376	+	return runner;
377	+	}
378	+
379		/**
380		* Runs all unit tests in the given test suite.
381		* Actual behavior influenced by jsr166.* system properties.
#	Line 228 | Line 387 | public class JSR166TestCase extends Test
387		System.setSecurityManager(new SecurityManager());
388		}
389		for (int i = 0; i < suiteRuns; i++) {
390	<	TestResult result = junit.textui.TestRunner.run(suite);
390	>	TestResult result = newPithyTestRunner().doRun(suite);
391		if (!result.wasSuccessful())
392		System.exit(1);
393		System.gc();
#	Line 312 | Line 471 | public class JSR166TestCase extends Test
471		AbstractQueuedLongSynchronizerTest.suite(),
472		ArrayBlockingQueueTest.suite(),
473		ArrayDequeTest.suite(),
474	+	ArrayListTest.suite(),
475		AtomicBooleanTest.suite(),
476		AtomicIntegerArrayTest.suite(),
477		AtomicIntegerFieldUpdaterTest.suite(),
#	Line 334 | Line 494 | public class JSR166TestCase extends Test
494		CopyOnWriteArrayListTest.suite(),
495		CopyOnWriteArraySetTest.suite(),
496		CountDownLatchTest.suite(),
497	+	CountedCompleterTest.suite(),
498		CyclicBarrierTest.suite(),
499		DelayQueueTest.suite(),
500		EntryTest.suite(),
#	Line 362 | Line 523 | public class JSR166TestCase extends Test
523		TreeMapTest.suite(),
524		TreeSetTest.suite(),
525		TreeSubMapTest.suite(),
526	<	TreeSubSetTest.suite());
526	>	TreeSubSetTest.suite(),
527	>	VectorTest.suite());
528
529		// Java8+ test classes
530		if (atLeastJava8()) {
531		String[] java8TestClassNames = {
532	+	"ArrayDeque8Test",
533		"Atomic8Test",
534		"CompletableFutureTest",
535		"ConcurrentHashMap8Test",
536	<	"CountedCompleterTest",
536	>	"CountedCompleter8Test",
537		"DoubleAccumulatorTest",
538		"DoubleAdderTest",
539		"ForkJoinPool8Test",
540		"ForkJoinTask8Test",
541	+	"LinkedBlockingDeque8Test",
542	+	"LinkedBlockingQueue8Test",
543		"LongAccumulatorTest",
544		"LongAdderTest",
545		"SplittableRandomTest",
546		"StampedLockTest",
547		"SubmissionPublisherTest",
548		"ThreadLocalRandom8Test",
549	+	"TimeUnit8Test",
550		};
551		addNamedTestClasses(suite, java8TestClassNames);
552		}
#	Line 388 | Line 554 | public class JSR166TestCase extends Test
554		// Java9+ test classes
555		if (atLeastJava9()) {
556		String[] java9TestClassNames = {
557	<	// Currently empty, but expecting varhandle tests
557	>	"AtomicBoolean9Test",
558	>	"AtomicInteger9Test",
559	>	"AtomicIntegerArray9Test",
560	>	"AtomicLong9Test",
561	>	"AtomicLongArray9Test",
562	>	"AtomicReference9Test",
563	>	"AtomicReferenceArray9Test",
564	>	"ExecutorCompletionService9Test",
565	>	"ForkJoinPool9Test",
566		};
567		addNamedTestClasses(suite, java9TestClassNames);
568		}
#	Line 399 | Line 573 | public class JSR166TestCase extends Test
573		/** Returns list of junit-style test method names in given class. */
574		public static ArrayList<String> testMethodNames(Class<?> testClass) {
575		Method[] methods = testClass.getDeclaredMethods();
576	<	ArrayList<String> names = new ArrayList<String>(methods.length);
576	>	ArrayList<String> names = new ArrayList<>(methods.length);
577		for (Method method : methods) {
578		if (method.getName().startsWith("test")
579		&& Modifier.isPublic(method.getModifiers())
#	Line 455 | Line 629 | public class JSR166TestCase extends Test
629		} else {
630		return new TestSuite();
631		}
458	–
632		}
633
634		// Delays for timing-dependent tests, in milliseconds.
#	Line 466 | Line 639 | public class JSR166TestCase extends Test
639		public static long LONG_DELAY_MS;
640
641		/**
642	<	* Returns the shortest timed delay. This could
643	<	* be reimplemented to use for example a Property.
642	>	* Returns the shortest timed delay. This can be scaled up for
643	>	* slow machines using the jsr166.delay.factor system property,
644	>	* or via jtreg's -timeoutFactor: flag.
645	>	* http://openjdk.java.net/jtreg/command-help.html
646		*/
647		protected long getShortDelay() {
648	<	return 50;
648	>	return (long) (50 * delayFactor);
649		}
650
651		/**
#	Line 483 | Line 658 | public class JSR166TestCase extends Test
658		LONG_DELAY_MS   = SHORT_DELAY_MS * 200;
659		}
660
661	+	private static final long TIMEOUT_DELAY_MS
662	+	= (long) (12.0 * Math.cbrt(delayFactor));
663	+
664		/**
665	<	* Returns a timeout in milliseconds to be used in tests that
666	<	* verify that operations block or time out.
665	>	* Returns a timeout in milliseconds to be used in tests that verify
666	>	* that operations block or time out.  We want this to be longer
667	>	* than the OS scheduling quantum, but not too long, so don't scale
668	>	* linearly with delayFactor; we use "crazy" cube root instead.
669		*/
670	<	long timeoutMillis() {
671	<	return SHORT_DELAY_MS / 4;
670	>	static long timeoutMillis() {
671	>	return TIMEOUT_DELAY_MS;
672		}
673
674		/**
#	Line 504 | Line 684 | public class JSR166TestCase extends Test
684		* The first exception encountered if any threadAssertXXX method fails.
685		*/
686		private final AtomicReference<Throwable> threadFailure
687	<	= new AtomicReference<Throwable>(null);
687	>	= new AtomicReference<>(null);
688
689		/**
690		* Records an exception so that it can be rethrown later in the test
#	Line 513 | Line 693 | public class JSR166TestCase extends Test
693		* the same test have no effect.
694		*/
695		public void threadRecordFailure(Throwable t) {
696	+	System.err.println(t);
697	+	dumpTestThreads();
698		threadFailure.compareAndSet(null, t);
699		}
700
#	Line 520 | Line 702 | public class JSR166TestCase extends Test
702		setDelays();
703		}
704
705	+	void tearDownFail(String format, Object... args) {
706	+	String msg = toString() + ": " + String.format(format, args);
707	+	System.err.println(msg);
708	+	dumpTestThreads();
709	+	throw new AssertionFailedError(msg);
710	+	}
711	+
712		/**
713		* Extra checks that get done for all test cases.
714		*
#	Line 547 | Line 736 | public class JSR166TestCase extends Test
736		}
737
738		if (Thread.interrupted())
739	<	throw new AssertionFailedError("interrupt status set in main thread");
739	>	tearDownFail("interrupt status set in main thread");
740
741		checkForkJoinPoolThreadLeaks();
742		}
743
744		/**
745	<	* Finds missing try { ... } finally { joinPool(e); }
745	>	* Finds missing PoolCleaners
746		*/
747		void checkForkJoinPoolThreadLeaks() throws InterruptedException {
748	<	Thread[] survivors = new Thread[5];
748	>	Thread[] survivors = new Thread[7];
749		int count = Thread.enumerate(survivors);
750		for (int i = 0; i < count; i++) {
751		Thread thread = survivors[i];
#	Line 564 | Line 753 | public class JSR166TestCase extends Test
753		if (name.startsWith("ForkJoinPool-")) {
754		// give thread some time to terminate
755		thread.join(LONG_DELAY_MS);
756	<	if (!thread.isAlive()) continue;
757	<	throw new AssertionFailedError
758	<	(String.format("Found leaked ForkJoinPool thread test=%s thread=%s%n",
570	<	toString(), name));
756	>	if (thread.isAlive())
757	>	tearDownFail("Found leaked ForkJoinPool thread thread=%s",
758	>	thread);
759		}
760		}
761	+
762	+	if (!ForkJoinPool.commonPool()
763	+	.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS))
764	+	tearDownFail("ForkJoin common pool thread stuck");
765		}
766
767		/**
#	Line 582 | Line 774 | public class JSR166TestCase extends Test
774		fail(reason);
775		} catch (AssertionFailedError t) {
776		threadRecordFailure(t);
777	<	fail(reason);
777	>	throw t;
778		}
779		}
780
#	Line 709 | Line 901 | public class JSR166TestCase extends Test
901		/**
902		* Delays, via Thread.sleep, for the given millisecond delay, but
903		* if the sleep is shorter than specified, may re-sleep or yield
904	<	* until time elapses.
904	>	* until time elapses.  Ensures that the given time, as measured
905	>	* by System.nanoTime(), has elapsed.
906		*/
907		static void delay(long millis) throws InterruptedException {
908	<	long startTime = System.nanoTime();
909	<	long ns = millis * 1000 * 1000;
910	<	for (;;) {
908	>	long nanos = millis * (1000 * 1000);
909	>	final long wakeupTime = System.nanoTime() + nanos;
910	>	do {
911		if (millis > 0L)
912		Thread.sleep(millis);
913		else // too short to sleep
914		Thread.yield();
915	<	long d = ns - (System.nanoTime() - startTime);
916	<	if (d > 0L)
917	<	millis = d / (1000 * 1000);
918	<	else
919	<	break;
915	>	nanos = wakeupTime - System.nanoTime();
916	>	millis = nanos / (1000 * 1000);
917	>	} while (nanos >= 0L);
918	>	}
919	>
920	>	/**
921	>	* Allows use of try-with-resources with per-test thread pools.
922	>	*/
923	>	class PoolCleaner implements AutoCloseable {
924	>	private final ExecutorService pool;
925	>	public PoolCleaner(ExecutorService pool) { this.pool = pool; }
926	>	public void close() { joinPool(pool); }
927	>	}
928	>
929	>	/**
930	>	* An extension of PoolCleaner that has an action to release the pool.
931	>	*/
932	>	class PoolCleanerWithReleaser extends PoolCleaner {
933	>	private final Runnable releaser;
934	>	public PoolCleanerWithReleaser(ExecutorService pool, Runnable releaser) {
935	>	super(pool);
936	>	this.releaser = releaser;
937		}
938	+	public void close() {
939	+	try {
940	+	releaser.run();
941	+	} finally {
942	+	super.close();
943	+	}
944	+	}
945	+	}
946	+
947	+	PoolCleaner cleaner(ExecutorService pool) {
948	+	return new PoolCleaner(pool);
949	+	}
950	+
951	+	PoolCleaner cleaner(ExecutorService pool, Runnable releaser) {
952	+	return new PoolCleanerWithReleaser(pool, releaser);
953	+	}
954	+
955	+	PoolCleaner cleaner(ExecutorService pool, CountDownLatch latch) {
956	+	return new PoolCleanerWithReleaser(pool, releaser(latch));
957	+	}
958	+
959	+	Runnable releaser(final CountDownLatch latch) {
960	+	return new Runnable() { public void run() {
961	+	do { latch.countDown(); }
962	+	while (latch.getCount() > 0);
963	+	}};
964	+	}
965	+
966	+	PoolCleaner cleaner(ExecutorService pool, AtomicBoolean flag) {
967	+	return new PoolCleanerWithReleaser(pool, releaser(flag));
968	+	}
969	+
970	+	Runnable releaser(final AtomicBoolean flag) {
971	+	return new Runnable() { public void run() { flag.set(true); }};
972		}
973
974		/**
#	Line 733 | Line 977 | public class JSR166TestCase extends Test
977		void joinPool(ExecutorService pool) {
978		try {
979		pool.shutdown();
980	<	if (!pool.awaitTermination(2 * LONG_DELAY_MS, MILLISECONDS))
981	<	fail("ExecutorService " + pool +
982	<	" did not terminate in a timely manner");
980	>	if (!pool.awaitTermination(2 * LONG_DELAY_MS, MILLISECONDS)) {
981	>	try {
982	>	threadFail("ExecutorService " + pool +
983	>	" did not terminate in a timely manner");
984	>	} finally {
985	>	// last resort, for the benefit of subsequent tests
986	>	pool.shutdownNow();
987	>	pool.awaitTermination(MEDIUM_DELAY_MS, MILLISECONDS);
988	>	}
989	>	}
990		} catch (SecurityException ok) {
991		// Allowed in case test doesn't have privs
992		} catch (InterruptedException fail) {
993	<	fail("Unexpected InterruptedException");
993	>	threadFail("Unexpected InterruptedException");
994		}
995		}
996
997	<	/** Like Runnable, but with the freedom to throw anything */
997	>	/**
998	>	* Like Runnable, but with the freedom to throw anything.
999	>	* junit folks had the same idea:
1000	>	* http://junit.org/junit5/docs/snapshot/api/org/junit/gen5/api/Executable.html
1001	>	*/
1002		interface Action { public void run() throws Throwable; }
1003
1004		/**
#	Line 753 | Line 1008 | public class JSR166TestCase extends Test
1008		*/
1009		void testInParallel(Action ... actions) {
1010		ExecutorService pool = Executors.newCachedThreadPool();
1011	<	try {
1011	>	try (PoolCleaner cleaner = cleaner(pool)) {
1012		ArrayList<Future<?>> futures = new ArrayList<>(actions.length);
1013		for (final Action action : actions)
1014		futures.add(pool.submit(new CheckedRunnable() {
#	Line 766 | Line 1021 | public class JSR166TestCase extends Test
1021		} catch (Exception ex) {
1022		threadUnexpectedException(ex);
1023		}
769	–	} finally {
770	–	joinPool(pool);
1024		}
1025		}
1026
1027		/**
1028	<	* A debugging tool to print all stack traces, as jstack does.
1029	<	*/
777	<	static void printAllStackTraces() {
778	<	for (ThreadInfo info :
779	<	ManagementFactory.getThreadMXBean()
780	<	.dumpAllThreads(true, true))
781	<	System.err.print(info);
782	<	}
783	<
784	<	/**
785	<	* Checks that thread does not terminate within the default
786	<	* millisecond delay of {@code timeoutMillis()}.
1028	>	* A debugging tool to print stack traces of most threads, as jstack does.
1029	>	* Uninteresting threads are filtered out.
1030		*/
1031	<	void assertThreadStaysAlive(Thread thread) {
1032	<	assertThreadStaysAlive(thread, timeoutMillis());
1033	<	}
1031	>	static void dumpTestThreads() {
1032	>	SecurityManager sm = System.getSecurityManager();
1033	>	if (sm != null) {
1034	>	try {
1035	>	System.setSecurityManager(null);
1036	>	} catch (SecurityException giveUp) {
1037	>	return;
1038	>	}
1039	>	}
1040
1041	<	/**
1042	<	* Checks that thread does not terminate within the given millisecond delay.
1043	<	*/
1044	<	void assertThreadStaysAlive(Thread thread, long millis) {
1045	<	try {
1046	<	// No need to optimize the failing case via Thread.join.
1047	<	delay(millis);
1048	<	assertTrue(thread.isAlive());
1049	<	} catch (InterruptedException fail) {
1050	<	fail("Unexpected InterruptedException");
1041	>	ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
1042	>	System.err.println("------ stacktrace dump start ------");
1043	>	for (ThreadInfo info : threadMXBean.dumpAllThreads(true, true)) {
1044	>	final String name = info.getThreadName();
1045	>	String lockName;
1046	>	if ("Signal Dispatcher".equals(name))
1047	>	continue;
1048	>	if ("Reference Handler".equals(name)
1049	>	&& (lockName = info.getLockName()) != null
1050	>	&& lockName.startsWith("java.lang.ref.Reference$Lock"))
1051	>	continue;
1052	>	if ("Finalizer".equals(name)
1053	>	&& (lockName = info.getLockName()) != null
1054	>	&& lockName.startsWith("java.lang.ref.ReferenceQueue$Lock"))
1055	>	continue;
1056	>	if ("checkForWedgedTest".equals(name))
1057	>	continue;
1058	>	System.err.print(info);
1059		}
1060	<	}
1060	>	System.err.println("------ stacktrace dump end ------");
1061
1062	<	/**
806	<	* Checks that the threads do not terminate within the default
807	<	* millisecond delay of {@code timeoutMillis()}.
808	<	*/
809	<	void assertThreadsStayAlive(Thread... threads) {
810	<	assertThreadsStayAlive(timeoutMillis(), threads);
1062	>	if (sm != null) System.setSecurityManager(sm);
1063		}
1064
1065		/**
1066	<	* Checks that the threads do not terminate within the given millisecond delay.
1066	>	* Checks that thread eventually enters the expected blocked thread state.
1067		*/
1068	<	void assertThreadsStayAlive(long millis, Thread... threads) {
1069	<	try {
1070	<	// No need to optimize the failing case via Thread.join.
1071	<	delay(millis);
1072	<	for (Thread thread : threads)
1073	<	assertTrue(thread.isAlive());
1074	<	} catch (InterruptedException fail) {
1075	<	fail("Unexpected InterruptedException");
1068	>	void assertThreadBlocks(Thread thread, Thread.State expected) {
1069	>	// always sleep at least 1 ms, with high probability avoiding
1070	>	// transitory states
1071	>	for (long retries = LONG_DELAY_MS * 3 / 4; retries-->0; ) {
1072	>	try { delay(1); }
1073	>	catch (InterruptedException fail) {
1074	>	fail("Unexpected InterruptedException");
1075	>	}
1076	>	Thread.State s = thread.getState();
1077	>	if (s == expected)
1078	>	return;
1079	>	else if (s == Thread.State.TERMINATED)
1080	>	fail("Unexpected thread termination");
1081		}
1082	+	fail("timed out waiting for thread to enter thread state " + expected);
1083		}
1084
1085		/**
#	Line 862 | Line 1120 | public class JSR166TestCase extends Test
1120		}
1121
1122		/**
1123	+	* The maximum number of consecutive spurious wakeups we should
1124	+	* tolerate (from APIs like LockSupport.park) before failing a test.
1125	+	*/
1126	+	static final int MAX_SPURIOUS_WAKEUPS = 10;
1127	+
1128	+	/**
1129		* The number of elements to place in collections, arrays, etc.
1130		*/
1131		public static final int SIZE = 20;
#	Line 965 | Line 1229 | public class JSR166TestCase extends Test
1229		}
1230		public void refresh() {}
1231		public String toString() {
1232	<	List<Permission> ps = new ArrayList<Permission>();
1232	>	List<Permission> ps = new ArrayList<>();
1233		for (Enumeration<Permission> e = perms.elements(); e.hasMoreElements();)
1234		ps.add(e.nextElement());
1235		return "AdjustablePolicy with permissions " + ps;
#	Line 995 | Line 1259 | public class JSR166TestCase extends Test
1259		* Sleeps until the given time has elapsed.
1260		* Throws AssertionFailedError if interrupted.
1261		*/
1262	<	void sleep(long millis) {
1262	>	static void sleep(long millis) {
1263		try {
1264		delay(millis);
1265		} catch (InterruptedException fail) {
#	Line 1011 | Line 1275 | public class JSR166TestCase extends Test
1275		* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1276		*/
1277		void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
1278	<	long startTime = System.nanoTime();
1278	>	long startTime = 0L;
1279		for (;;) {
1280		Thread.State s = thread.getState();
1281		if (s == Thread.State.BLOCKED ||
#	Line 1020 | Line 1284 | public class JSR166TestCase extends Test
1284		return;
1285		else if (s == Thread.State.TERMINATED)
1286		fail("Unexpected thread termination");
1287	+	else if (startTime == 0L)
1288	+	startTime = System.nanoTime();
1289		else if (millisElapsedSince(startTime) > timeoutMillis) {
1290		threadAssertTrue(thread.isAlive());
1291	<	return;
1291	>	fail("timed out waiting for thread to enter wait state");
1292		}
1293		Thread.yield();
1294		}
1295		}
1296
1297		/**
1298	<	* Waits up to LONG_DELAY_MS for the given thread to enter a wait
1299	<	* state: BLOCKED, WAITING, or TIMED_WAITING.
1298	>	* Spin-waits up to the specified number of milliseconds for the given
1299	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING,
1300	>	* and additionally satisfy the given condition.
1301	>	*/
1302	>	void waitForThreadToEnterWaitState(
1303	>	Thread thread, long timeoutMillis, Callable<Boolean> waitingForGodot) {
1304	>	long startTime = 0L;
1305	>	for (;;) {
1306	>	Thread.State s = thread.getState();
1307	>	if (s == Thread.State.BLOCKED ||
1308	>	s == Thread.State.WAITING ||
1309	>	s == Thread.State.TIMED_WAITING) {
1310	>	try {
1311	>	if (waitingForGodot.call())
1312	>	return;
1313	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
1314	>	}
1315	>	else if (s == Thread.State.TERMINATED)
1316	>	fail("Unexpected thread termination");
1317	>	else if (startTime == 0L)
1318	>	startTime = System.nanoTime();
1319	>	else if (millisElapsedSince(startTime) > timeoutMillis) {
1320	>	threadAssertTrue(thread.isAlive());
1321	>	fail("timed out waiting for thread to enter wait state");
1322	>	}
1323	>	Thread.yield();
1324	>	}
1325	>	}
1326	>
1327	>	/**
1328	>	* Spin-waits up to LONG_DELAY_MS milliseconds for the given thread to
1329	>	* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1330		*/
1331		void waitForThreadToEnterWaitState(Thread thread) {
1332		waitForThreadToEnterWaitState(thread, LONG_DELAY_MS);
1333		}
1334
1335		/**
1336	+	* Spin-waits up to LONG_DELAY_MS milliseconds for the given thread to
1337	+	* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING,
1338	+	* and additionally satisfy the given condition.
1339	+	*/
1340	+	void waitForThreadToEnterWaitState(
1341	+	Thread thread, Callable<Boolean> waitingForGodot) {
1342	+	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS, waitingForGodot);
1343	+	}
1344	+
1345	+	/**
1346		* Returns the number of milliseconds since time given by
1347		* startNanoTime, which must have been previously returned from a
1348		* call to {@link System#nanoTime()}.
#	Line 1098 | Line 1404 | public class JSR166TestCase extends Test
1404		} finally {
1405		if (t.getState() != Thread.State.TERMINATED) {
1406		t.interrupt();
1407	<	fail("Test timed out");
1407	>	threadFail("timed out waiting for thread to terminate");
1408		}
1409		}
1410		}
#	Line 1223 | Line 1529 | public class JSR166TestCase extends Test
1529		public static final String TEST_STRING = "a test string";
1530
1531		public static class StringTask implements Callable<String> {
1532	<	public String call() { return TEST_STRING; }
1532	>	final String value;
1533	>	public StringTask() { this(TEST_STRING); }
1534	>	public StringTask(String value) { this.value = value; }
1535	>	public String call() { return value; }
1536		}
1537
1538		public Callable<String> latchAwaitingStringTask(final CountDownLatch latch) {
#	Line 1236 | Line 1545 | public class JSR166TestCase extends Test
1545		}};
1546		}
1547
1548	<	public Runnable awaiter(final CountDownLatch latch) {
1548	>	public Runnable countDowner(final CountDownLatch latch) {
1549		return new CheckedRunnable() {
1550		public void realRun() throws InterruptedException {
1551	<	await(latch);
1551	>	latch.countDown();
1552		}};
1553		}
1554
1555	<	public void await(CountDownLatch latch) {
1555	>	class LatchAwaiter extends CheckedRunnable {
1556	>	static final int NEW = 0;
1557	>	static final int RUNNING = 1;
1558	>	static final int DONE = 2;
1559	>	final CountDownLatch latch;
1560	>	int state = NEW;
1561	>	LatchAwaiter(CountDownLatch latch) { this.latch = latch; }
1562	>	public void realRun() throws InterruptedException {
1563	>	state = 1;
1564	>	await(latch);
1565	>	state = 2;
1566	>	}
1567	>	}
1568	>
1569	>	public LatchAwaiter awaiter(CountDownLatch latch) {
1570	>	return new LatchAwaiter(latch);
1571	>	}
1572	>
1573	>	public void await(CountDownLatch latch, long timeoutMillis) {
1574		try {
1575	<	assertTrue(latch.await(LONG_DELAY_MS, MILLISECONDS));
1575	>	if (!latch.await(timeoutMillis, MILLISECONDS))
1576	>	fail("timed out waiting for CountDownLatch for "
1577	>	+ (timeoutMillis/1000) + " sec");
1578		} catch (Throwable fail) {
1579		threadUnexpectedException(fail);
1580		}
1581		}
1582
1583	+	public void await(CountDownLatch latch) {
1584	+	await(latch, LONG_DELAY_MS);
1585	+	}
1586	+
1587		public void await(Semaphore semaphore) {
1588		try {
1589	<	assertTrue(semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
1589	>	if (!semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS))
1590	>	fail("timed out waiting for Semaphore for "
1591	>	+ (LONG_DELAY_MS/1000) + " sec");
1592	>	} catch (Throwable fail) {
1593	>	threadUnexpectedException(fail);
1594	>	}
1595	>	}
1596	>
1597	>	public void await(CyclicBarrier barrier) {
1598	>	try {
1599	>	barrier.await(LONG_DELAY_MS, MILLISECONDS);
1600		} catch (Throwable fail) {
1601		threadUnexpectedException(fail);
1602		}
#	Line 1483 | Line 1826 | public class JSR166TestCase extends Test
1826		* A CyclicBarrier that uses timed await and fails with
1827		* AssertionFailedErrors instead of throwing checked exceptions.
1828		*/
1829	<	public class CheckedBarrier extends CyclicBarrier {
1829	>	public static class CheckedBarrier extends CyclicBarrier {
1830		public CheckedBarrier(int parties) { super(parties); }
1831
1832		public int await() {
#	Line 1547 | Line 1890 | public class JSR166TestCase extends Test
1890		}
1891		}
1892
1893	+	void assertImmutable(final Object o) {
1894	+	if (o instanceof Collection) {
1895	+	assertThrows(
1896	+	UnsupportedOperationException.class,
1897	+	new Runnable() { public void run() {
1898	+	((Collection) o).add(null);}});
1899	+	}
1900	+	}
1901	+
1902		@SuppressWarnings("unchecked")
1903		<T> T serialClone(T o) {
1904		try {
1905		ObjectInputStream ois = new ObjectInputStream
1906		(new ByteArrayInputStream(serialBytes(o)));
1907		T clone = (T) ois.readObject();
1908	+	if (o == clone) assertImmutable(o);
1909		assertSame(o.getClass(), clone.getClass());
1910		return clone;
1911		} catch (Throwable fail) {
#	Line 1561 | Line 1914 | public class JSR166TestCase extends Test
1914		}
1915		}
1916
1917	+	/**
1918	+	* A version of serialClone that leaves error handling (for
1919	+	* e.g. NotSerializableException) up to the caller.
1920	+	*/
1921	+	@SuppressWarnings("unchecked")
1922	+	<T> T serialClonePossiblyFailing(T o)
1923	+	throws ReflectiveOperationException, java.io.IOException {
1924	+	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1925	+	ObjectOutputStream oos = new ObjectOutputStream(bos);
1926	+	oos.writeObject(o);
1927	+	oos.flush();
1928	+	oos.close();
1929	+	ObjectInputStream ois = new ObjectInputStream
1930	+	(new ByteArrayInputStream(bos.toByteArray()));
1931	+	T clone = (T) ois.readObject();
1932	+	if (o == clone) assertImmutable(o);
1933	+	assertSame(o.getClass(), clone.getClass());
1934	+	return clone;
1935	+	}
1936	+
1937	+	/**
1938	+	* If o implements Cloneable and has a public clone method,
1939	+	* returns a clone of o, else null.
1940	+	*/
1941	+	@SuppressWarnings("unchecked")
1942	+	<T> T cloneableClone(T o) {
1943	+	if (!(o instanceof Cloneable)) return null;
1944	+	final T clone;
1945	+	try {
1946	+	clone = (T) o.getClass().getMethod("clone").invoke(o);
1947	+	} catch (NoSuchMethodException ok) {
1948	+	return null;
1949	+	} catch (ReflectiveOperationException unexpected) {
1950	+	throw new Error(unexpected);
1951	+	}
1952	+	assertNotSame(o, clone); // not 100% guaranteed by spec
1953	+	assertSame(o.getClass(), clone.getClass());
1954	+	return clone;
1955	+	}
1956	+
1957		public void assertThrows(Class<? extends Throwable> expectedExceptionClass,
1958		Runnable... throwingActions) {
1959		for (Runnable throwingAction : throwingActions) {
#	Line 1589 | Line 1982 | public class JSR166TestCase extends Test
1982		} catch (NoSuchElementException success) {}
1983		assertFalse(it.hasNext());
1984		}
1985	+
1986	+	public <T> Callable<T> callableThrowing(final Exception ex) {
1987	+	return new Callable<T>() { public T call() throws Exception { throw ex; }};
1988	+	}
1989	+
1990	+	public Runnable runnableThrowing(final RuntimeException ex) {
1991	+	return new Runnable() { public void run() { throw ex; }};
1992	+	}
1993	+
1994	+	/** A reusable thread pool to be shared by tests. */
1995	+	static final ExecutorService cachedThreadPool =
1996	+	new ThreadPoolExecutor(0, Integer.MAX_VALUE,
1997	+	1000L, MILLISECONDS,
1998	+	new SynchronousQueue<Runnable>());
1999	+
2000	+	static <T> void shuffle(T[] array) {
2001	+	Collections.shuffle(Arrays.asList(array), ThreadLocalRandom.current());
2002	+	}
2003		}

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