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Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.19 by jsr166, Wed Aug 25 00:07:03 2010 UTC vs.
Revision 1.55 by jsr166, Thu Sep 5 21:37:25 2019 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
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		* Other contributors include Andrew Wright, Jeffrey Hayes,
6		* Pat Fisher, Mike Judd.
7		*/
8
9	–	import junit.framework.*;
10	–	import java.util.concurrent.*;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	<	import java.util.*;
10	>	import static java.util.concurrent.TimeUnit.NANOSECONDS;
11	>
12	>	import java.util.ArrayList;
13	>	import java.util.List;
14	>	import java.util.NoSuchElementException;
15	>	import java.util.concurrent.Callable;
16	>	import java.util.concurrent.CancellationException;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.ExecutionException;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21	>	import java.util.concurrent.Future;
22	>	import java.util.concurrent.FutureTask;
23	>	import java.util.concurrent.TimeoutException;
24	>	import java.util.concurrent.atomic.AtomicInteger;
25	>
26	>	import junit.framework.Test;
27	>	import junit.framework.TestSuite;
28
29		public class FutureTaskTest extends JSR166TestCase {
30
31		public static void main(String[] args) {
32	<	junit.textui.TestRunner.run(suite());
32	>	main(suite(), args);
33		}
34		public static Test suite() {
35		return new TestSuite(FutureTaskTest.class);
36		}
37
38	+	void checkIsDone(Future<?> f) {
39	+	assertTrue(f.isDone());
40	+	assertFalse(f.cancel(false));
41	+	assertFalse(f.cancel(true));
42	+	if (f instanceof PublicFutureTask) {
43	+	PublicFutureTask pf = (PublicFutureTask) f;
44	+	assertEquals(1, pf.doneCount());
45	+	assertFalse(pf.runAndReset());
46	+	assertEquals(1, pf.doneCount());
47	+	Object r = null; Object exInfo = null;
48	+	try {
49	+	r = f.get();
50	+	} catch (CancellationException t) {
51	+	exInfo = CancellationException.class;
52	+	} catch (ExecutionException t) {
53	+	exInfo = t.getCause();
54	+	} catch (Throwable t) {
55	+	threadUnexpectedException(t);
56	+	}
57	+
58	+	// Check that run and runAndReset have no effect.
59	+	int savedRunCount = pf.runCount();
60	+	pf.run();
61	+	pf.runAndReset();
62	+	assertEquals(savedRunCount, pf.runCount());
63	+	Object r2 = null;
64	+	try {
65	+	r2 = f.get();
66	+	} catch (CancellationException t) {
67	+	assertSame(exInfo, CancellationException.class);
68	+	} catch (ExecutionException t) {
69	+	assertSame(exInfo, t.getCause());
70	+	} catch (Throwable t) {
71	+	threadUnexpectedException(t);
72	+	}
73	+	if (exInfo == null)
74	+	assertSame(r, r2);
75	+	assertTrue(f.isDone());
76	+	}
77	+	}
78	+
79	+	void checkNotDone(Future<?> f) {
80	+	assertFalse(f.isDone());
81	+	assertFalse(f.isCancelled());
82	+	if (f instanceof PublicFutureTask) {
83	+	PublicFutureTask pf = (PublicFutureTask) f;
84	+	assertEquals(0, pf.doneCount());
85	+	assertEquals(0, pf.setCount());
86	+	assertEquals(0, pf.setExceptionCount());
87	+	}
88	+	}
89	+
90	+	void checkIsRunning(Future<?> f) {
91	+	checkNotDone(f);
92	+	if (f instanceof FutureTask) {
93	+	FutureTask ft = (FutureTask<?>) f;
94	+	// Check that run methods do nothing
95	+	ft.run();
96	+	if (f instanceof PublicFutureTask) {
97	+	PublicFutureTask pf = (PublicFutureTask) f;
98	+	int savedRunCount = pf.runCount();
99	+	pf.run();
100	+	assertFalse(pf.runAndReset());
101	+	assertEquals(savedRunCount, pf.runCount());
102	+	}
103	+	checkNotDone(f);
104	+	}
105	+	}
106	+
107	+	<T> void checkCompletedNormally(Future<T> f, T expectedValue) {
108	+	checkIsDone(f);
109	+	assertFalse(f.isCancelled());
110	+
111	+	T v1 = null, v2 = null;
112	+	try {
113	+	v1 = f.get();
114	+	v2 = f.get(randomTimeout(), randomTimeUnit());
115	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
116	+	assertSame(expectedValue, v1);
117	+	assertSame(expectedValue, v2);
118	+	}
119	+
120	+	void checkCancelled(Future<?> f) {
121	+	checkIsDone(f);
122	+	assertTrue(f.isCancelled());
123	+
124	+	try {
125	+	f.get();
126	+	shouldThrow();
127	+	} catch (CancellationException success) {
128	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
129	+
130	+	try {
131	+	f.get(randomTimeout(), randomTimeUnit());
132	+	shouldThrow();
133	+	} catch (CancellationException success) {
134	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
135	+	}
136	+
137	+	void tryToConfuseDoneTask(PublicFutureTask pf) {
138	+	pf.set(new Object());
139	+	pf.setException(new Error());
140	+	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
141	+	pf.cancel(mayInterruptIfRunning);
142	+	}
143	+	}
144	+
145	+	void checkCompletedAbnormally(Future<?> f, Throwable t) {
146	+	checkIsDone(f);
147	+	assertFalse(f.isCancelled());
148	+
149	+	try {
150	+	f.get();
151	+	shouldThrow();
152	+	} catch (ExecutionException success) {
153	+	assertSame(t, success.getCause());
154	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
155	+
156	+	try {
157	+	f.get(randomTimeout(), randomTimeUnit());
158	+	shouldThrow();
159	+	} catch (ExecutionException success) {
160	+	assertSame(t, success.getCause());
161	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
162	+	}
163	+
164		/**
165		* Subclass to expose protected methods
166		*/
167		static class PublicFutureTask extends FutureTask {
168	<	public PublicFutureTask(Callable r) { super(r); }
169	<	public boolean runAndReset() { return super.runAndReset(); }
170	<	public void set(Object x) { super.set(x); }
171	<	public void setException(Throwable t) { super.setException(t); }
168	>	private final AtomicInteger runCount;
169	>	private final AtomicInteger doneCount = new AtomicInteger(0);
170	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
171	>	private final AtomicInteger setCount = new AtomicInteger(0);
172	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
173	>	public int runCount() { return runCount.get(); }
174	>	public int doneCount() { return doneCount.get(); }
175	>	public int runAndResetCount() { return runAndResetCount.get(); }
176	>	public int setCount() { return setCount.get(); }
177	>	public int setExceptionCount() { return setExceptionCount.get(); }
178	>
179	>	PublicFutureTask(Runnable runnable) {
180	>	this(runnable, seven);
181	>	}
182	>	PublicFutureTask(Runnable runnable, Object result) {
183	>	this(runnable, result, new AtomicInteger(0));
184	>	}
185	>	private PublicFutureTask(final Runnable runnable, Object result,
186	>	final AtomicInteger runCount) {
187	>	super(new Runnable() {
188	>	public void run() {
189	>	runCount.getAndIncrement();
190	>	runnable.run();
191	>	}}, result);
192	>	this.runCount = runCount;
193	>	}
194	>	PublicFutureTask(Callable callable) {
195	>	this(callable, new AtomicInteger(0));
196	>	}
197	>	private PublicFutureTask(final Callable callable,
198	>	final AtomicInteger runCount) {
199	>	super(new Callable() {
200	>	public Object call() throws Exception {
201	>	runCount.getAndIncrement();
202	>	return callable.call();
203	>	}});
204	>	this.runCount = runCount;
205	>	}
206	>	@Override public void done() {
207	>	assertTrue(isDone());
208	>	doneCount.incrementAndGet();
209	>	super.done();
210	>	}
211	>	@Override public boolean runAndReset() {
212	>	runAndResetCount.incrementAndGet();
213	>	return super.runAndReset();
214	>	}
215	>	@Override public void set(Object x) {
216	>	setCount.incrementAndGet();
217	>	super.set(x);
218	>	}
219	>	@Override public void setException(Throwable t) {
220	>	setExceptionCount.incrementAndGet();
221	>	super.setException(t);
222	>	}
223	>	}
224	>
225	>	class Counter extends CheckedRunnable {
226	>	final AtomicInteger count = new AtomicInteger(0);
227	>	public int get() { return count.get(); }
228	>	public void realRun() {
229	>	count.getAndIncrement();
230	>	}
231		}
232
233		/**
234	<	* Creating a future with a null callable throws NPE
234	>	* creating a future with a null callable throws NullPointerException
235		*/
236		public void testConstructor() {
237		try {
238	<	FutureTask task = new FutureTask(null);
238	>	new FutureTask(null);
239		shouldThrow();
240		} catch (NullPointerException success) {}
241		}
242
243		/**
244	<	* creating a future with null runnable fails
244	>	* creating a future with null runnable throws NullPointerException
245		*/
246		public void testConstructor2() {
247		try {
248	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
248	>	new FutureTask(null, Boolean.TRUE);
249		shouldThrow();
250		} catch (NullPointerException success) {}
251		}
#	Line 54 | Line 254 | public class FutureTaskTest extends JSR1
254		* isDone is true when a task completes
255		*/
256		public void testIsDone() {
257	<	FutureTask task = new FutureTask(new NoOpCallable());
257	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
258	>	assertFalse(task.isDone());
259		task.run();
260		assertTrue(task.isDone());
261	<	assertFalse(task.isCancelled());
261	>	checkCompletedNormally(task, Boolean.TRUE);
262	>	assertEquals(1, task.runCount());
263		}
264
265		/**
#	Line 65 | Line 267 | public class FutureTaskTest extends JSR1
267		*/
268		public void testRunAndReset() {
269		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
270	<	assertTrue(task.runAndReset());
271	<	assertFalse(task.isDone());
270	>	for (int i = 0; i < 3; i++) {
271	>	assertTrue(task.runAndReset());
272	>	checkNotDone(task);
273	>	assertEquals(i + 1, task.runCount());
274	>	assertEquals(i + 1, task.runAndResetCount());
275	>	assertEquals(0, task.setCount());
276	>	assertEquals(0, task.setExceptionCount());
277	>	}
278		}
279
280		/**
281		* runAndReset after cancellation fails
282		*/
283	<	public void testResetAfterCancel() {
284	<	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
285	<	assertTrue(task.cancel(false));
286	<	assertFalse(task.runAndReset());
287	<	assertTrue(task.isDone());
288	<	assertTrue(task.isCancelled());
283	>	public void testRunAndResetAfterCancel() {
284	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
285	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
286	>	assertTrue(task.cancel(mayInterruptIfRunning));
287	>	for (int i = 0; i < 3; i++) {
288	>	assertFalse(task.runAndReset());
289	>	assertEquals(0, task.runCount());
290	>	assertEquals(i + 1, task.runAndResetCount());
291	>	assertEquals(0, task.setCount());
292	>	assertEquals(0, task.setExceptionCount());
293	>	}
294	>	tryToConfuseDoneTask(task);
295	>	checkCancelled(task);
296	>	}
297		}
298
83	–
84	–
299		/**
300		* setting value causes get to return it
301		*/
302		public void testSet() throws Exception {
303		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
304		task.set(one);
305	<	assertSame(task.get(), one);
305	>	for (int i = 0; i < 3; i++) {
306	>	assertSame(one, task.get());
307	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
308	>	assertEquals(1, task.setCount());
309	>	}
310	>	tryToConfuseDoneTask(task);
311	>	checkCompletedNormally(task, one);
312	>	assertEquals(0, task.runCount());
313		}
314
315		/**
316		* setException causes get to throw ExecutionException
317		*/
318	<	public void testSetException() throws Exception {
318	>	public void testSetException_get() throws Exception {
319		Exception nse = new NoSuchElementException();
320		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
321		task.setException(nse);
322	+
323	+	try {
324	+	task.get();
325	+	shouldThrow();
326	+	} catch (ExecutionException success) {
327	+	assertSame(nse, success.getCause());
328	+	checkCompletedAbnormally(task, nse);
329	+	}
330	+
331		try {
332	<	Object x = task.get();
332	>	task.get(LONG_DELAY_MS, MILLISECONDS);
333		shouldThrow();
334		} catch (ExecutionException success) {
335	<	assertSame(success.getCause(), nse);
335	>	assertSame(nse, success.getCause());
336	>	checkCompletedAbnormally(task, nse);
337		}
338	+
339	+	assertEquals(1, task.setExceptionCount());
340	+	assertEquals(0, task.setCount());
341	+	tryToConfuseDoneTask(task);
342	+	checkCompletedAbnormally(task, nse);
343	+	assertEquals(0, task.runCount());
344		}
345
346		/**
347	<	*  Cancelling before running succeeds
347	>	* cancel(false) before run succeeds
348		*/
349		public void testCancelBeforeRun() {
350	<	FutureTask task = new FutureTask(new NoOpCallable());
350	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
351		assertTrue(task.cancel(false));
352		task.run();
353	<	assertTrue(task.isDone());
353	>	assertEquals(0, task.runCount());
354	>	assertEquals(0, task.setCount());
355	>	assertEquals(0, task.setExceptionCount());
356		assertTrue(task.isCancelled());
357	+	assertTrue(task.isDone());
358	+	tryToConfuseDoneTask(task);
359	+	assertEquals(0, task.runCount());
360	+	checkCancelled(task);
361		}
362
363		/**
364	<	* Cancel(true) before run succeeds
364	>	* cancel(true) before run succeeds
365		*/
366		public void testCancelBeforeRun2() {
367	<	FutureTask task = new FutureTask(new NoOpCallable());
367	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
368		assertTrue(task.cancel(true));
369		task.run();
370	<	assertTrue(task.isDone());
370	>	assertEquals(0, task.runCount());
371	>	assertEquals(0, task.setCount());
372	>	assertEquals(0, task.setExceptionCount());
373		assertTrue(task.isCancelled());
374	+	assertTrue(task.isDone());
375	+	tryToConfuseDoneTask(task);
376	+	assertEquals(0, task.runCount());
377	+	checkCancelled(task);
378		}
379
380		/**
381	<	* cancel of a completed task fails
381	>	* cancel(false) of a completed task fails
382		*/
383		public void testCancelAfterRun() {
384	<	FutureTask task = new FutureTask(new NoOpCallable());
384	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
385		task.run();
386		assertFalse(task.cancel(false));
387	<	assertTrue(task.isDone());
388	<	assertFalse(task.isCancelled());
387	>	assertEquals(1, task.runCount());
388	>	assertEquals(1, task.setCount());
389	>	assertEquals(0, task.setExceptionCount());
390	>	tryToConfuseDoneTask(task);
391	>	checkCompletedNormally(task, Boolean.TRUE);
392	>	assertEquals(1, task.runCount());
393		}
394
395		/**
396	<	* cancel(true) interrupts a running task
396	>	* cancel(true) of a completed task fails
397		*/
398	<	public void testCancelInterrupt() throws InterruptedException {
399	<	final FutureTask task =
400	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
401	<	public Object realCall() throws InterruptedException {
402	<	Thread.sleep(SMALL_DELAY_MS);
403	<	return Boolean.TRUE;
398	>	public void testCancelAfterRun2() {
399	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
400	>	task.run();
401	>	assertFalse(task.cancel(true));
402	>	assertEquals(1, task.runCount());
403	>	assertEquals(1, task.setCount());
404	>	assertEquals(0, task.setExceptionCount());
405	>	tryToConfuseDoneTask(task);
406	>	checkCompletedNormally(task, Boolean.TRUE);
407	>	assertEquals(1, task.runCount());
408	>	}
409	>
410	>	/**
411	>	* cancel(true) interrupts a running task that subsequently succeeds
412	>	*/
413	>	public void testCancelInterrupt() {
414	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
415	>	final PublicFutureTask task =
416	>	new PublicFutureTask(new CheckedRunnable() {
417	>	public void realRun() {
418	>	pleaseCancel.countDown();
419	>	try {
420	>	delay(LONG_DELAY_MS);
421	>	shouldThrow();
422	>	} catch (InterruptedException success) {}
423	>	assertFalse(Thread.interrupted());
424		}});
425
426	<	Thread t = new Thread(task);
427	<	t.start();
155	<	Thread.sleep(SHORT_DELAY_MS);
426	>	Thread t = newStartedThread(task);
427	>	await(pleaseCancel);
428		assertTrue(task.cancel(true));
157	–	t.join();
158	–	assertTrue(task.isDone());
429		assertTrue(task.isCancelled());
430	+	assertTrue(task.isDone());
431	+	awaitTermination(t);
432	+	assertEquals(1, task.runCount());
433	+	assertEquals(1, task.setCount());
434	+	assertEquals(0, task.setExceptionCount());
435	+	tryToConfuseDoneTask(task);
436	+	checkCancelled(task);
437		}
438
162	–
439		/**
440	<	* cancel(false) does not interrupt a running task
441	<	*/
442	<	public void testCancelNoInterrupt() throws InterruptedException {
443	<	final FutureTask task =
444	<	new FutureTask(new CheckedCallable<Object>() {
445	<	public Object realCall() throws InterruptedException {
446	<	Thread.sleep(MEDIUM_DELAY_MS);
447	<	return Boolean.TRUE;
440	>	* cancel(true) tries to interrupt a running task, but
441	>	* Thread.interrupt throws (simulating a restrictive security
442	>	* manager)
443	>	*/
444	>	public void testCancelInterrupt_ThrowsSecurityException() {
445	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
446	>	final CountDownLatch cancelled = new CountDownLatch(1);
447	>	final PublicFutureTask task =
448	>	new PublicFutureTask(new CheckedRunnable() {
449	>	public void realRun() {
450	>	pleaseCancel.countDown();
451	>	await(cancelled);
452	>	assertFalse(Thread.interrupted());
453		}});
454
455	<	Thread t = new Thread(task);
455	>	final Thread t = new Thread(task) {
456	>	// Simulate a restrictive security manager.
457	>	@Override public void interrupt() {
458	>	throw new SecurityException();
459	>	}};
460	>	t.setDaemon(true);
461		t.start();
462	<	Thread.sleep(SHORT_DELAY_MS);
463	<	assertTrue(task.cancel(false));
464	<	t.join();
462	>
463	>	await(pleaseCancel);
464	>	try {
465	>	task.cancel(true);
466	>	shouldThrow();
467	>	} catch (SecurityException success) {}
468	>
469	>	// We failed to deliver the interrupt, but the world retains
470	>	// its sanity, as if we had done task.cancel(false)
471	>	assertTrue(task.isCancelled());
472		assertTrue(task.isDone());
473	+	assertEquals(1, task.runCount());
474	+	assertEquals(1, task.doneCount());
475	+	assertEquals(0, task.setCount());
476	+	assertEquals(0, task.setExceptionCount());
477	+	cancelled.countDown();
478	+	awaitTermination(t);
479	+	assertEquals(1, task.setCount());
480	+	assertEquals(0, task.setExceptionCount());
481	+	tryToConfuseDoneTask(task);
482	+	checkCancelled(task);
483	+	}
484	+
485	+	/**
486	+	* cancel(true) interrupts a running task that subsequently throws
487	+	*/
488	+	public void testCancelInterrupt_taskFails() {
489	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
490	+	final PublicFutureTask task =
491	+	new PublicFutureTask(new Runnable() {
492	+	public void run() {
493	+	pleaseCancel.countDown();
494	+	try {
495	+	delay(LONG_DELAY_MS);
496	+	threadShouldThrow();
497	+	} catch (InterruptedException success) {
498	+	} catch (Throwable t) { threadUnexpectedException(t); }
499	+	throw new RuntimeException();
500	+	}});
501	+
502	+	Thread t = newStartedThread(task);
503	+	await(pleaseCancel);
504	+	assertTrue(task.cancel(true));
505		assertTrue(task.isCancelled());
506	+	awaitTermination(t);
507	+	assertEquals(1, task.runCount());
508	+	assertEquals(0, task.setCount());
509	+	assertEquals(1, task.setExceptionCount());
510	+	tryToConfuseDoneTask(task);
511	+	checkCancelled(task);
512		}
513
514		/**
515	<	* set in one thread causes get in another thread to retrieve value
515	>	* cancel(false) does not interrupt a running task
516		*/
517	<	public void testGet1() throws InterruptedException {
518	<	final FutureTask ft =
519	<	new FutureTask(new CheckedCallable<Object>() {
520	<	public Object realCall() throws InterruptedException {
517	>	public void testCancelNoInterrupt() {
518	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
519	>	final CountDownLatch cancelled = new CountDownLatch(1);
520	>	final PublicFutureTask task =
521	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
522	>	public Boolean realCall() {
523	>	pleaseCancel.countDown();
524	>	await(cancelled);
525	>	assertFalse(Thread.interrupted());
526		return Boolean.TRUE;
527		}});
192	–	Thread t = new Thread(new CheckedRunnable() {
193	–	public void realRun() throws Exception {
194	–	assertSame(Boolean.TRUE, ft.get());
195	–	}});
528
529	<	assertFalse(ft.isDone());
530	<	assertFalse(ft.isCancelled());
531	<	t.start();
532	<	Thread.sleep(SHORT_DELAY_MS);
533	<	ft.run();
534	<	t.join();
535	<	assertTrue(ft.isDone());
536	<	assertFalse(ft.isCancelled());
529	>	Thread t = newStartedThread(task);
530	>	await(pleaseCancel);
531	>	assertTrue(task.cancel(false));
532	>	assertTrue(task.isCancelled());
533	>	cancelled.countDown();
534	>	awaitTermination(t);
535	>	assertEquals(1, task.runCount());
536	>	assertEquals(1, task.setCount());
537	>	assertEquals(0, task.setExceptionCount());
538	>	tryToConfuseDoneTask(task);
539	>	checkCancelled(task);
540		}
541
542		/**
543	<	* set in one thread causes timed get in another thread to retrieve value
543	>	* run in one thread causes get in another thread to retrieve value
544		*/
545	<	public void testTimedGet1() throws InterruptedException {
546	<	final FutureTask ft =
547	<	new FutureTask(new CheckedCallable<Object>() {
548	<	public Object realCall() throws InterruptedException {
549	<	return Boolean.TRUE;
545	>	public void testGetRun() {
546	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
547	>
548	>	final PublicFutureTask task =
549	>	new PublicFutureTask(new CheckedCallable<Object>() {
550	>	public Object realCall() {
551	>	return two;
552		}});
553	<	Thread t = new Thread(new CheckedRunnable() {
553	>
554	>	Thread t1 = newStartedThread(new CheckedRunnable() {
555		public void realRun() throws Exception {
556	<	assertSame(Boolean.TRUE, ft.get(SMALL_DELAY_MS, MILLISECONDS));
556	>	pleaseRun.countDown();
557	>	assertSame(two, task.get());
558		}});
559
560	<	assertFalse(ft.isDone());
561	<	assertFalse(ft.isCancelled());
562	<	t.start();
563	<	Thread.sleep(SHORT_DELAY_MS);
564	<	ft.run();
565	<	t.join();
566	<	assertTrue(ft.isDone());
567	<	assertFalse(ft.isCancelled());
560	>	Thread t2 = newStartedThread(new CheckedRunnable() {
561	>	public void realRun() throws Exception {
562	>	pleaseRun.countDown();
563	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
564	>	}});
565	>
566	>	await(pleaseRun);
567	>	checkNotDone(task);
568	>	assertTrue(t1.isAlive());
569	>	assertTrue(t2.isAlive());
570	>	task.run();
571	>	checkCompletedNormally(task, two);
572	>	assertEquals(1, task.runCount());
573	>	assertEquals(1, task.setCount());
574	>	assertEquals(0, task.setExceptionCount());
575	>	awaitTermination(t1);
576	>	awaitTermination(t2);
577	>	tryToConfuseDoneTask(task);
578	>	checkCompletedNormally(task, two);
579		}
580
581		/**
582	<	*  Cancelling a task causes timed get in another thread to throw CancellationException
582	>	* set in one thread causes get in another thread to retrieve value
583		*/
584	<	public void testTimedGet_Cancellation() throws InterruptedException {
585	<	final FutureTask ft =
586	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
584	>	public void testGetSet() {
585	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
586	>
587	>	final PublicFutureTask task =
588	>	new PublicFutureTask(new CheckedCallable<Object>() {
589		public Object realCall() throws InterruptedException {
590	<	Thread.sleep(SMALL_DELAY_MS);
239	<	return Boolean.TRUE;
590	>	return two;
591		}});
592
593	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
593	>	Thread t1 = newStartedThread(new CheckedRunnable() {
594		public void realRun() throws Exception {
595	<	ft.get(MEDIUM_DELAY_MS, MILLISECONDS);
596	<	}};
597	<	Thread t2 = new Thread(ft);
598	<	t1.start();
599	<	t2.start();
600	<	Thread.sleep(SHORT_DELAY_MS);
601	<	ft.cancel(true);
602	<	t1.join();
603	<	t2.join();
595	>	pleaseSet.countDown();
596	>	assertSame(two, task.get());
597	>	}});
598	>
599	>	Thread t2 = newStartedThread(new CheckedRunnable() {
600	>	public void realRun() throws Exception {
601	>	pleaseSet.countDown();
602	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
603	>	}});
604	>
605	>	await(pleaseSet);
606	>	checkNotDone(task);
607	>	assertTrue(t1.isAlive());
608	>	assertTrue(t2.isAlive());
609	>	task.set(two);
610	>	assertEquals(0, task.runCount());
611	>	assertEquals(1, task.setCount());
612	>	assertEquals(0, task.setExceptionCount());
613	>	tryToConfuseDoneTask(task);
614	>	checkCompletedNormally(task, two);
615	>	awaitTermination(t1);
616	>	awaitTermination(t2);
617		}
618
619		/**
620	<	* Cancelling a task causes get in another thread to throw CancellationException
621	<	*/
622	<	public void testGet_Cancellation() throws InterruptedException {
623	<	final FutureTask ft =
624	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
625	<	public Object realCall() throws InterruptedException {
626	<	Thread.sleep(SMALL_DELAY_MS);
627	<	return Boolean.TRUE;
628	<	}});
629	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
630	<	public void realRun() throws Exception {
631	<	ft.get();
620	>	* Cancelling a task causes timed get in another thread to throw
621	>	* CancellationException
622	>	*/
623	>	public void testTimedGet_Cancellation() {
624	>	testTimedGet_Cancellation(false);
625	>	}
626	>	public void testTimedGet_Cancellation_interrupt() {
627	>	testTimedGet_Cancellation(true);
628	>	}
629	>	public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) {
630	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
631	>	final CountDownLatch cancelled = new CountDownLatch(1);
632	>	final Callable<Object> callable =
633	>	new CheckedCallable<Object>() {
634	>	public Object realCall() throws InterruptedException {
635	>	pleaseCancel.countDown();
636	>	if (mayInterruptIfRunning) {
637	>	try {
638	>	delay(2*LONG_DELAY_MS);
639	>	} catch (InterruptedException success) {}
640	>	} else {
641	>	await(cancelled);
642	>	}
643	>	return two;
644		}};
645	+	final PublicFutureTask task = new PublicFutureTask(callable);
646
647	<	Thread t2 = new Thread(ft);
647	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
648	>	public void realRun() throws Exception {
649	>	pleaseCancel.countDown();
650	>	task.get();
651	>	}};
652	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
653	>	public void realRun() throws Exception {
654	>	pleaseCancel.countDown();
655	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
656	>	}};
657		t1.start();
658		t2.start();
659	<	Thread.sleep(SHORT_DELAY_MS);
660	<	ft.cancel(true);
661	<	t1.join();
662	<	t2.join();
659	>	Thread t3 = newStartedThread(task);
660	>	await(pleaseCancel);
661	>	checkIsRunning(task);
662	>	task.cancel(mayInterruptIfRunning);
663	>	checkCancelled(task);
664	>	awaitTermination(t1);
665	>	awaitTermination(t2);
666	>	cancelled.countDown();
667	>	awaitTermination(t3);
668	>	assertEquals(1, task.runCount());
669	>	assertEquals(1, task.setCount());
670	>	assertEquals(0, task.setExceptionCount());
671	>	tryToConfuseDoneTask(task);
672	>	checkCancelled(task);
673		}
674
279	–
675		/**
676		* A runtime exception in task causes get to throw ExecutionException
677		*/
678		public void testGet_ExecutionException() throws InterruptedException {
679	<	final FutureTask ft = new FutureTask(new Callable() {
679	>	final ArithmeticException e = new ArithmeticException();
680	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
681		public Object call() {
682	<	return 5/0;
682	>	throw e;
683		}});
684
685	<	ft.run();
685	>	task.run();
686	>	assertEquals(1, task.runCount());
687	>	assertEquals(0, task.setCount());
688	>	assertEquals(1, task.setExceptionCount());
689		try {
690	<	ft.get();
690	>	task.get();
691		shouldThrow();
692		} catch (ExecutionException success) {
693	<	assertTrue(success.getCause() instanceof ArithmeticException);
693	>	assertSame(e, success.getCause());
694	>	tryToConfuseDoneTask(task);
695	>	checkCompletedAbnormally(task, success.getCause());
696		}
697		}
698
699		/**
700	<	*  A runtime exception in task causes timed get to throw ExecutionException
700	>	* A runtime exception in task causes timed get to throw ExecutionException
701		*/
702		public void testTimedGet_ExecutionException2() throws Exception {
703	<	final FutureTask ft = new FutureTask(new Callable() {
703	>	final ArithmeticException e = new ArithmeticException();
704	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
705		public Object call() {
706	<	return 5/0;
706	>	throw e;
707		}});
708
709	<	ft.run();
709	>	task.run();
710		try {
711	<	ft.get(SHORT_DELAY_MS, MILLISECONDS);
711	>	task.get(LONG_DELAY_MS, MILLISECONDS);
712		shouldThrow();
713		} catch (ExecutionException success) {
714	<	assertTrue(success.getCause() instanceof ArithmeticException);
714	>	assertSame(e, success.getCause());
715	>	tryToConfuseDoneTask(task);
716	>	checkCompletedAbnormally(task, success.getCause());
717		}
718		}
719
316	–
720		/**
721	<	* Interrupting a waiting get causes it to throw InterruptedException
721	>	* get is interruptible
722		*/
723	<	public void testGet_InterruptedException() throws InterruptedException {
724	<	final FutureTask ft = new FutureTask(new NoOpCallable());
725	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
723	>	public void testGet_interruptible() {
724	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
725	>	final FutureTask task = new FutureTask(new NoOpCallable());
726	>	Thread t = newStartedThread(new CheckedRunnable() {
727		public void realRun() throws Exception {
728	<	ft.get();
728	>	Thread.currentThread().interrupt();
729	>	try {
730	>	task.get();
731	>	shouldThrow();
732	>	} catch (InterruptedException success) {}
733	>	assertFalse(Thread.interrupted());
734	>
735	>	pleaseInterrupt.countDown();
736	>	try {
737	>	task.get();
738	>	shouldThrow();
739	>	} catch (InterruptedException success) {}
740	>	assertFalse(Thread.interrupted());
741		}});
742
743	<	t.start();
328	<	Thread.sleep(SHORT_DELAY_MS);
743	>	await(pleaseInterrupt);
744		t.interrupt();
745	<	t.join();
745	>	awaitTermination(t);
746	>	checkNotDone(task);
747		}
748
749		/**
750	<	*  Interrupting a waiting timed get causes it to throw InterruptedException
750	>	* timed get is interruptible
751		*/
752	<	public void testTimedGet_InterruptedException2() throws InterruptedException {
753	<	final FutureTask ft = new FutureTask(new NoOpCallable());
754	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
752	>	public void testTimedGet_interruptible() {
753	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
754	>	final FutureTask task = new FutureTask(new NoOpCallable());
755	>	Thread t = newStartedThread(new CheckedRunnable() {
756		public void realRun() throws Exception {
757	<	ft.get(LONG_DELAY_MS,MILLISECONDS);
757	>	Thread.currentThread().interrupt();
758	>	try {
759	>	task.get(randomTimeout(), randomTimeUnit());
760	>	shouldThrow();
761	>	} catch (InterruptedException success) {}
762	>	assertFalse(Thread.interrupted());
763	>
764	>	pleaseInterrupt.countDown();
765	>	try {
766	>	task.get(LONGER_DELAY_MS, MILLISECONDS);
767	>	shouldThrow();
768	>	} catch (InterruptedException success) {}
769	>	assertFalse(Thread.interrupted());
770		}});
771
772	<	t.start();
773	<	Thread.sleep(SHORT_DELAY_MS);
772	>	await(pleaseInterrupt);
773	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
774		t.interrupt();
775	<	t.join();
775	>	awaitTermination(t);
776	>	checkNotDone(task);
777		}
778
779		/**
780		* A timed out timed get throws TimeoutException
781		*/
782		public void testGet_TimeoutException() throws Exception {
783	+	FutureTask task = new FutureTask(new NoOpCallable());
784	+	long startTime = System.nanoTime();
785		try {
786	<	FutureTask ft = new FutureTask(new NoOpCallable());
355	<	ft.get(1,MILLISECONDS);
786	>	task.get(timeoutMillis(), MILLISECONDS);
787		shouldThrow();
788	<	} catch (TimeoutException success) {}
788	>	} catch (TimeoutException success) {
789	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
790	>	}
791	>	}
792	>
793	>	/**
794	>	* timed get with null TimeUnit throws NullPointerException
795	>	*/
796	>	public void testGet_NullTimeUnit() throws Exception {
797	>	FutureTask task = new FutureTask(new NoOpCallable());
798	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
799	>
800	>	for (long timeout : timeouts) {
801	>	try {
802	>	task.get(timeout, null);
803	>	shouldThrow();
804	>	} catch (NullPointerException success) {}
805	>	}
806	>
807	>	task.run();
808	>
809	>	for (long timeout : timeouts) {
810	>	try {
811	>	task.get(timeout, null);
812	>	shouldThrow();
813	>	} catch (NullPointerException success) {}
814	>	}
815	>	}
816	>
817	>	/**
818	>	* timed get with most negative timeout works correctly (i.e. no
819	>	* underflow bug)
820	>	*/
821	>	public void testGet_NegativeInfinityTimeout() throws Exception {
822	>	final ExecutorService pool = Executors.newFixedThreadPool(10);
823	>	final Runnable nop = new Runnable() { public void run() {}};
824	>	final FutureTask<Void> task = new FutureTask<>(nop, null);
825	>	final List<Future<?>> futures = new ArrayList<>();
826	>	Runnable r = new Runnable() { public void run() {
827	>	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
828	>	try {
829	>	task.get(timeout, NANOSECONDS);
830	>	shouldThrow();
831	>	} catch (TimeoutException success) {
832	>	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
833	>	for (int i = 0; i < 10; i++)
834	>	futures.add(pool.submit(r));
835	>	try {
836	>	joinPool(pool);
837	>	for (Future<?> future : futures)
838	>	checkCompletedNormally(future, null);
839	>	} finally {
840	>	task.run();         // last resort to help terminate
841	>	}
842	>	}
843	>
844	>	/**
845	>	* toString indicates current completion state
846	>	*/
847	>	public void testToString_incomplete() {
848	>	FutureTask<String> f = new FutureTask<>(() -> "");
849	>	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
850	>	if (testImplementationDetails)
851	>	assertTrue(f.toString().startsWith(
852	>	identityString(f) + "[Not completed, task ="));
853	>	}
854	>
855	>	public void testToString_normal() {
856	>	FutureTask<String> f = new FutureTask<>(() -> "");
857	>	f.run();
858	>	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
859	>	if (testImplementationDetails)
860	>	assertEquals(identityString(f) + "[Completed normally]",
861	>	f.toString());
862	>	}
863	>
864	>	public void testToString_exception() {
865	>	FutureTask<String> f = new FutureTask<>(
866	>	() -> { throw new ArithmeticException(); });
867	>	f.run();
868	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
869	>	if (testImplementationDetails)
870	>	assertTrue(f.toString().startsWith(
871	>	identityString(f) + "[Completed exceptionally: "));
872	>	}
873	>
874	>	public void testToString_cancelled() {
875	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
876	>	FutureTask<String> f = new FutureTask<>(() -> "");
877	>	assertTrue(f.cancel(mayInterruptIfRunning));
878	>	assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]"));
879	>	if (testImplementationDetails)
880	>	assertEquals(identityString(f) + "[Cancelled]",
881	>	f.toString());
882	>	}
883		}
884
885		}

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