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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 1.45 by jsr166, Sun May 14 00:56:43 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
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	>	import static java.util.concurrent.TimeUnit.SECONDS;
12	>
13	>	import java.util.ArrayList;
14	>	import java.util.List;
15	>	import java.util.NoSuchElementException;
16	>	import java.util.concurrent.Callable;
17	>	import java.util.concurrent.CancellationException;
18	>	import java.util.concurrent.CountDownLatch;
19	>	import java.util.concurrent.ExecutionException;
20	>	import java.util.concurrent.Executors;
21	>	import java.util.concurrent.ExecutorService;
22	>	import java.util.concurrent.Future;
23	>	import java.util.concurrent.FutureTask;
24	>	import java.util.concurrent.TimeoutException;
25	>	import java.util.concurrent.atomic.AtomicInteger;
26	>
27	>	import junit.framework.Test;
28	>	import junit.framework.TestSuite;
29
30		public class FutureTaskTest extends JSR166TestCase {
31
32		public static void main(String[] args) {
33	<	junit.textui.TestRunner.run(suite());
33	>	main(suite(), args);
34		}
35		public static Test suite() {
36		return new TestSuite(FutureTaskTest.class);
37		}
38
39	+	void checkIsDone(Future<?> f) {
40	+	assertTrue(f.isDone());
41	+	assertFalse(f.cancel(false));
42	+	assertFalse(f.cancel(true));
43	+	if (f instanceof PublicFutureTask) {
44	+	PublicFutureTask pf = (PublicFutureTask) f;
45	+	assertEquals(1, pf.doneCount());
46	+	assertFalse(pf.runAndReset());
47	+	assertEquals(1, pf.doneCount());
48	+	Object r = null; Object exInfo = null;
49	+	try {
50	+	r = f.get();
51	+	} catch (CancellationException t) {
52	+	exInfo = CancellationException.class;
53	+	} catch (ExecutionException t) {
54	+	exInfo = t.getCause();
55	+	} catch (Throwable t) {
56	+	threadUnexpectedException(t);
57	+	}
58	+
59	+	// Check that run and runAndReset have no effect.
60	+	int savedRunCount = pf.runCount();
61	+	pf.run();
62	+	pf.runAndReset();
63	+	assertEquals(savedRunCount, pf.runCount());
64	+	try {
65	+	assertSame(r, 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	+	assertTrue(f.isDone());
74	+	}
75	+	}
76	+
77	+	void checkNotDone(Future<?> f) {
78	+	assertFalse(f.isDone());
79	+	assertFalse(f.isCancelled());
80	+	if (f instanceof PublicFutureTask) {
81	+	PublicFutureTask pf = (PublicFutureTask) f;
82	+	assertEquals(0, pf.doneCount());
83	+	assertEquals(0, pf.setCount());
84	+	assertEquals(0, pf.setExceptionCount());
85	+	}
86	+	}
87	+
88	+	void checkIsRunning(Future<?> f) {
89	+	checkNotDone(f);
90	+	if (f instanceof FutureTask) {
91	+	FutureTask ft = (FutureTask<?>) f;
92	+	// Check that run methods do nothing
93	+	ft.run();
94	+	if (f instanceof PublicFutureTask) {
95	+	PublicFutureTask pf = (PublicFutureTask) f;
96	+	int savedRunCount = pf.runCount();
97	+	pf.run();
98	+	assertFalse(pf.runAndReset());
99	+	assertEquals(savedRunCount, pf.runCount());
100	+	}
101	+	checkNotDone(f);
102	+	}
103	+	}
104	+
105	+	<T> void checkCompletedNormally(Future<T> f, T expected) {
106	+	checkIsDone(f);
107	+	assertFalse(f.isCancelled());
108	+
109	+	try {
110	+	assertSame(expected, f.get());
111	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
112	+	try {
113	+	assertSame(expected, f.get(5L, SECONDS));
114	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
115	+	}
116	+
117	+	void checkCancelled(Future<?> f) {
118	+	checkIsDone(f);
119	+	assertTrue(f.isCancelled());
120	+
121	+	try {
122	+	f.get();
123	+	shouldThrow();
124	+	} catch (CancellationException success) {
125	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
126	+
127	+	try {
128	+	f.get(5L, SECONDS);
129	+	shouldThrow();
130	+	} catch (CancellationException success) {
131	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
132	+	}
133	+
134	+	void tryToConfuseDoneTask(PublicFutureTask pf) {
135	+	pf.set(new Object());
136	+	pf.setException(new Error());
137	+	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
138	+	pf.cancel(mayInterruptIfRunning);
139	+	}
140	+	}
141	+
142	+	void checkCompletedAbnormally(Future<?> f, Throwable t) {
143	+	checkIsDone(f);
144	+	assertFalse(f.isCancelled());
145	+
146	+	try {
147	+	f.get();
148	+	shouldThrow();
149	+	} catch (ExecutionException success) {
150	+	assertSame(t, success.getCause());
151	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
152	+
153	+	try {
154	+	f.get(5L, SECONDS);
155	+	shouldThrow();
156	+	} catch (ExecutionException success) {
157	+	assertSame(t, success.getCause());
158	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
159	+	}
160	+
161		/**
162		* Subclass to expose protected methods
163		*/
164		static class PublicFutureTask extends FutureTask {
165	<	public PublicFutureTask(Callable r) { super(r); }
166	<	public boolean runAndReset() { return super.runAndReset(); }
167	<	public void set(Object x) { super.set(x); }
168	<	public void setException(Throwable t) { super.setException(t); }
165	>	private final AtomicInteger runCount;
166	>	private final AtomicInteger doneCount = new AtomicInteger(0);
167	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
168	>	private final AtomicInteger setCount = new AtomicInteger(0);
169	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
170	>	public int runCount() { return runCount.get(); }
171	>	public int doneCount() { return doneCount.get(); }
172	>	public int runAndResetCount() { return runAndResetCount.get(); }
173	>	public int setCount() { return setCount.get(); }
174	>	public int setExceptionCount() { return setExceptionCount.get(); }
175	>
176	>	PublicFutureTask(Runnable runnable) {
177	>	this(runnable, seven);
178	>	}
179	>	PublicFutureTask(Runnable runnable, Object result) {
180	>	this(runnable, result, new AtomicInteger(0));
181	>	}
182	>	private PublicFutureTask(final Runnable runnable, Object result,
183	>	final AtomicInteger runCount) {
184	>	super(new Runnable() {
185	>	public void run() {
186	>	runCount.getAndIncrement();
187	>	runnable.run();
188	>	}}, result);
189	>	this.runCount = runCount;
190	>	}
191	>	PublicFutureTask(Callable callable) {
192	>	this(callable, new AtomicInteger(0));
193	>	}
194	>	private PublicFutureTask(final Callable callable,
195	>	final AtomicInteger runCount) {
196	>	super(new Callable() {
197	>	public Object call() throws Exception {
198	>	runCount.getAndIncrement();
199	>	return callable.call();
200	>	}});
201	>	this.runCount = runCount;
202	>	}
203	>	@Override public void done() {
204	>	assertTrue(isDone());
205	>	doneCount.incrementAndGet();
206	>	super.done();
207	>	}
208	>	@Override public boolean runAndReset() {
209	>	runAndResetCount.incrementAndGet();
210	>	return super.runAndReset();
211	>	}
212	>	@Override public void set(Object x) {
213	>	setCount.incrementAndGet();
214	>	super.set(x);
215	>	}
216	>	@Override public void setException(Throwable t) {
217	>	setExceptionCount.incrementAndGet();
218	>	super.setException(t);
219	>	}
220	>	}
221	>
222	>	class Counter extends CheckedRunnable {
223	>	final AtomicInteger count = new AtomicInteger(0);
224	>	public int get() { return count.get(); }
225	>	public void realRun() {
226	>	count.getAndIncrement();
227	>	}
228		}
229
230		/**
231	<	* Creating a future with a null callable throws NPE
231	>	* creating a future with a null callable throws NullPointerException
232		*/
233		public void testConstructor() {
234		try {
235	<	FutureTask task = new FutureTask(null);
235	>	new FutureTask(null);
236		shouldThrow();
237		} catch (NullPointerException success) {}
238		}
239
240		/**
241	<	* creating a future with null runnable fails
241	>	* creating a future with null runnable throws NullPointerException
242		*/
243		public void testConstructor2() {
244		try {
245	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
245	>	new FutureTask(null, Boolean.TRUE);
246		shouldThrow();
247		} catch (NullPointerException success) {}
248		}
#	Line 54 | Line 251 | public class FutureTaskTest extends JSR1
251		* isDone is true when a task completes
252		*/
253		public void testIsDone() {
254	<	FutureTask task = new FutureTask(new NoOpCallable());
254	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
255	>	assertFalse(task.isDone());
256		task.run();
257		assertTrue(task.isDone());
258	<	assertFalse(task.isCancelled());
258	>	checkCompletedNormally(task, Boolean.TRUE);
259	>	assertEquals(1, task.runCount());
260		}
261
262		/**
#	Line 65 | Line 264 | public class FutureTaskTest extends JSR1
264		*/
265		public void testRunAndReset() {
266		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
267	<	assertTrue(task.runAndReset());
268	<	assertFalse(task.isDone());
267	>	for (int i = 0; i < 3; i++) {
268	>	assertTrue(task.runAndReset());
269	>	checkNotDone(task);
270	>	assertEquals(i + 1, task.runCount());
271	>	assertEquals(i + 1, task.runAndResetCount());
272	>	assertEquals(0, task.setCount());
273	>	assertEquals(0, task.setExceptionCount());
274	>	}
275		}
276
277		/**
278		* runAndReset after cancellation fails
279		*/
280	<	public void testResetAfterCancel() {
281	<	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
282	<	assertTrue(task.cancel(false));
283	<	assertFalse(task.runAndReset());
284	<	assertTrue(task.isDone());
285	<	assertTrue(task.isCancelled());
280	>	public void testRunAndResetAfterCancel() {
281	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
282	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
283	>	assertTrue(task.cancel(mayInterruptIfRunning));
284	>	for (int i = 0; i < 3; i++) {
285	>	assertFalse(task.runAndReset());
286	>	assertEquals(0, task.runCount());
287	>	assertEquals(i + 1, task.runAndResetCount());
288	>	assertEquals(0, task.setCount());
289	>	assertEquals(0, task.setExceptionCount());
290	>	}
291	>	tryToConfuseDoneTask(task);
292	>	checkCancelled(task);
293	>	}
294		}
295
83	–
84	–
296		/**
297		* setting value causes get to return it
298		*/
299		public void testSet() throws Exception {
300		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
301		task.set(one);
302	<	assertSame(task.get(), one);
302	>	for (int i = 0; i < 3; i++) {
303	>	assertSame(one, task.get());
304	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
305	>	assertEquals(1, task.setCount());
306	>	}
307	>	tryToConfuseDoneTask(task);
308	>	checkCompletedNormally(task, one);
309	>	assertEquals(0, task.runCount());
310		}
311
312		/**
313		* setException causes get to throw ExecutionException
314		*/
315	<	public void testSetException() throws Exception {
315	>	public void testSetException_get() throws Exception {
316		Exception nse = new NoSuchElementException();
317		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
318		task.setException(nse);
319	+
320		try {
321	<	Object x = task.get();
321	>	task.get();
322		shouldThrow();
323		} catch (ExecutionException success) {
324	<	assertSame(success.getCause(), nse);
324	>	assertSame(nse, success.getCause());
325	>	checkCompletedAbnormally(task, nse);
326		}
327	+
328	+	try {
329	+	task.get(LONG_DELAY_MS, MILLISECONDS);
330	+	shouldThrow();
331	+	} catch (ExecutionException success) {
332	+	assertSame(nse, success.getCause());
333	+	checkCompletedAbnormally(task, nse);
334	+	}
335	+
336	+	assertEquals(1, task.setExceptionCount());
337	+	assertEquals(0, task.setCount());
338	+	tryToConfuseDoneTask(task);
339	+	checkCompletedAbnormally(task, nse);
340	+	assertEquals(0, task.runCount());
341		}
342
343		/**
344	<	*  Cancelling before running succeeds
344	>	* cancel(false) before run succeeds
345		*/
346		public void testCancelBeforeRun() {
347	<	FutureTask task = new FutureTask(new NoOpCallable());
347	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
348		assertTrue(task.cancel(false));
349		task.run();
350	<	assertTrue(task.isDone());
350	>	assertEquals(0, task.runCount());
351	>	assertEquals(0, task.setCount());
352	>	assertEquals(0, task.setExceptionCount());
353		assertTrue(task.isCancelled());
354	+	assertTrue(task.isDone());
355	+	tryToConfuseDoneTask(task);
356	+	assertEquals(0, task.runCount());
357	+	checkCancelled(task);
358		}
359
360		/**
361	<	* Cancel(true) before run succeeds
361	>	* cancel(true) before run succeeds
362		*/
363		public void testCancelBeforeRun2() {
364	<	FutureTask task = new FutureTask(new NoOpCallable());
364	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
365		assertTrue(task.cancel(true));
366		task.run();
367	<	assertTrue(task.isDone());
367	>	assertEquals(0, task.runCount());
368	>	assertEquals(0, task.setCount());
369	>	assertEquals(0, task.setExceptionCount());
370		assertTrue(task.isCancelled());
371	+	assertTrue(task.isDone());
372	+	tryToConfuseDoneTask(task);
373	+	assertEquals(0, task.runCount());
374	+	checkCancelled(task);
375		}
376
377		/**
378	<	* cancel of a completed task fails
378	>	* cancel(false) of a completed task fails
379		*/
380		public void testCancelAfterRun() {
381	<	FutureTask task = new FutureTask(new NoOpCallable());
381	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
382		task.run();
383		assertFalse(task.cancel(false));
384	<	assertTrue(task.isDone());
385	<	assertFalse(task.isCancelled());
384	>	assertEquals(1, task.runCount());
385	>	assertEquals(1, task.setCount());
386	>	assertEquals(0, task.setExceptionCount());
387	>	tryToConfuseDoneTask(task);
388	>	checkCompletedNormally(task, Boolean.TRUE);
389	>	assertEquals(1, task.runCount());
390		}
391
392		/**
393	<	* cancel(true) interrupts a running task
393	>	* cancel(true) of a completed task fails
394		*/
395	<	public void testCancelInterrupt() throws InterruptedException {
396	<	final FutureTask task =
397	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
398	<	public Object realCall() throws InterruptedException {
399	<	Thread.sleep(SMALL_DELAY_MS);
400	<	return Boolean.TRUE;
395	>	public void testCancelAfterRun2() {
396	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
397	>	task.run();
398	>	assertFalse(task.cancel(true));
399	>	assertEquals(1, task.runCount());
400	>	assertEquals(1, task.setCount());
401	>	assertEquals(0, task.setExceptionCount());
402	>	tryToConfuseDoneTask(task);
403	>	checkCompletedNormally(task, Boolean.TRUE);
404	>	assertEquals(1, task.runCount());
405	>	}
406	>
407	>	/**
408	>	* cancel(true) interrupts a running task that subsequently succeeds
409	>	*/
410	>	public void testCancelInterrupt() {
411	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
412	>	final PublicFutureTask task =
413	>	new PublicFutureTask(new CheckedRunnable() {
414	>	public void realRun() {
415	>	pleaseCancel.countDown();
416	>	try {
417	>	delay(LONG_DELAY_MS);
418	>	shouldThrow();
419	>	} catch (InterruptedException success) {}
420	>	assertFalse(Thread.interrupted());
421		}});
422
423	<	Thread t = new Thread(task);
424	<	t.start();
155	<	Thread.sleep(SHORT_DELAY_MS);
423	>	Thread t = newStartedThread(task);
424	>	await(pleaseCancel);
425		assertTrue(task.cancel(true));
157	–	t.join();
158	–	assertTrue(task.isDone());
426		assertTrue(task.isCancelled());
427	+	assertTrue(task.isDone());
428	+	awaitTermination(t);
429	+	assertEquals(1, task.runCount());
430	+	assertEquals(1, task.setCount());
431	+	assertEquals(0, task.setExceptionCount());
432	+	tryToConfuseDoneTask(task);
433	+	checkCancelled(task);
434		}
435
162	–
436		/**
437	<	* cancel(false) does not interrupt a running task
438	<	*/
439	<	public void testCancelNoInterrupt() throws InterruptedException {
440	<	final FutureTask task =
441	<	new FutureTask(new CheckedCallable<Object>() {
442	<	public Object realCall() throws InterruptedException {
443	<	Thread.sleep(MEDIUM_DELAY_MS);
444	<	return Boolean.TRUE;
437	>	* cancel(true) tries to interrupt a running task, but
438	>	* Thread.interrupt throws (simulating a restrictive security
439	>	* manager)
440	>	*/
441	>	public void testCancelInterrupt_ThrowsSecurityException() {
442	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
443	>	final CountDownLatch cancelled = new CountDownLatch(1);
444	>	final PublicFutureTask task =
445	>	new PublicFutureTask(new CheckedRunnable() {
446	>	public void realRun() {
447	>	pleaseCancel.countDown();
448	>	await(cancelled);
449	>	assertFalse(Thread.interrupted());
450		}});
451
452	<	Thread t = new Thread(task);
452	>	final Thread t = new Thread(task) {
453	>	// Simulate a restrictive security manager.
454	>	@Override public void interrupt() {
455	>	throw new SecurityException();
456	>	}};
457	>	t.setDaemon(true);
458		t.start();
459	<	Thread.sleep(SHORT_DELAY_MS);
460	<	assertTrue(task.cancel(false));
461	<	t.join();
459	>
460	>	await(pleaseCancel);
461	>	try {
462	>	task.cancel(true);
463	>	shouldThrow();
464	>	} catch (SecurityException expected) {}
465	>
466	>	// We failed to deliver the interrupt, but the world retains
467	>	// its sanity, as if we had done task.cancel(false)
468	>	assertTrue(task.isCancelled());
469		assertTrue(task.isDone());
470	+	assertEquals(1, task.runCount());
471	+	assertEquals(1, task.doneCount());
472	+	assertEquals(0, task.setCount());
473	+	assertEquals(0, task.setExceptionCount());
474	+	cancelled.countDown();
475	+	awaitTermination(t);
476	+	assertEquals(1, task.setCount());
477	+	assertEquals(0, task.setExceptionCount());
478	+	tryToConfuseDoneTask(task);
479	+	checkCancelled(task);
480	+	}
481	+
482	+	/**
483	+	* cancel(true) interrupts a running task that subsequently throws
484	+	*/
485	+	public void testCancelInterrupt_taskFails() {
486	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
487	+	final PublicFutureTask task =
488	+	new PublicFutureTask(new Runnable() {
489	+	public void run() {
490	+	pleaseCancel.countDown();
491	+	try {
492	+	delay(LONG_DELAY_MS);
493	+	threadShouldThrow();
494	+	} catch (InterruptedException success) {
495	+	} catch (Throwable t) { threadUnexpectedException(t); }
496	+	throw new RuntimeException();
497	+	}});
498	+
499	+	Thread t = newStartedThread(task);
500	+	await(pleaseCancel);
501	+	assertTrue(task.cancel(true));
502		assertTrue(task.isCancelled());
503	+	awaitTermination(t);
504	+	assertEquals(1, task.runCount());
505	+	assertEquals(0, task.setCount());
506	+	assertEquals(1, task.setExceptionCount());
507	+	tryToConfuseDoneTask(task);
508	+	checkCancelled(task);
509		}
510
511		/**
512	<	* set in one thread causes get in another thread to retrieve value
512	>	* cancel(false) does not interrupt a running task
513		*/
514	<	public void testGet1() throws InterruptedException {
515	<	final FutureTask ft =
516	<	new FutureTask(new CheckedCallable<Object>() {
517	<	public Object realCall() throws InterruptedException {
514	>	public void testCancelNoInterrupt() {
515	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
516	>	final CountDownLatch cancelled = new CountDownLatch(1);
517	>	final PublicFutureTask task =
518	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
519	>	public Boolean realCall() {
520	>	pleaseCancel.countDown();
521	>	await(cancelled);
522	>	assertFalse(Thread.interrupted());
523		return Boolean.TRUE;
524		}});
192	–	Thread t = new Thread(new CheckedRunnable() {
193	–	public void realRun() throws Exception {
194	–	assertSame(Boolean.TRUE, ft.get());
195	–	}});
525
526	<	assertFalse(ft.isDone());
527	<	assertFalse(ft.isCancelled());
528	<	t.start();
529	<	Thread.sleep(SHORT_DELAY_MS);
530	<	ft.run();
531	<	t.join();
532	<	assertTrue(ft.isDone());
533	<	assertFalse(ft.isCancelled());
526	>	Thread t = newStartedThread(task);
527	>	await(pleaseCancel);
528	>	assertTrue(task.cancel(false));
529	>	assertTrue(task.isCancelled());
530	>	cancelled.countDown();
531	>	awaitTermination(t);
532	>	assertEquals(1, task.runCount());
533	>	assertEquals(1, task.setCount());
534	>	assertEquals(0, task.setExceptionCount());
535	>	tryToConfuseDoneTask(task);
536	>	checkCancelled(task);
537		}
538
539		/**
540	<	* set in one thread causes timed get in another thread to retrieve value
540	>	* run in one thread causes get in another thread to retrieve value
541		*/
542	<	public void testTimedGet1() throws InterruptedException {
543	<	final FutureTask ft =
544	<	new FutureTask(new CheckedCallable<Object>() {
545	<	public Object realCall() throws InterruptedException {
546	<	return Boolean.TRUE;
542	>	public void testGetRun() {
543	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
544	>
545	>	final PublicFutureTask task =
546	>	new PublicFutureTask(new CheckedCallable<Object>() {
547	>	public Object realCall() {
548	>	return two;
549		}});
550	<	Thread t = new Thread(new CheckedRunnable() {
550	>
551	>	Thread t1 = newStartedThread(new CheckedRunnable() {
552		public void realRun() throws Exception {
553	<	assertSame(Boolean.TRUE, ft.get(SMALL_DELAY_MS, MILLISECONDS));
553	>	pleaseRun.countDown();
554	>	assertSame(two, task.get());
555		}});
556
557	<	assertFalse(ft.isDone());
558	<	assertFalse(ft.isCancelled());
559	<	t.start();
560	<	Thread.sleep(SHORT_DELAY_MS);
561	<	ft.run();
562	<	t.join();
563	<	assertTrue(ft.isDone());
564	<	assertFalse(ft.isCancelled());
557	>	Thread t2 = newStartedThread(new CheckedRunnable() {
558	>	public void realRun() throws Exception {
559	>	pleaseRun.countDown();
560	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
561	>	}});
562	>
563	>	await(pleaseRun);
564	>	checkNotDone(task);
565	>	assertTrue(t1.isAlive());
566	>	assertTrue(t2.isAlive());
567	>	task.run();
568	>	checkCompletedNormally(task, two);
569	>	assertEquals(1, task.runCount());
570	>	assertEquals(1, task.setCount());
571	>	assertEquals(0, task.setExceptionCount());
572	>	awaitTermination(t1);
573	>	awaitTermination(t2);
574	>	tryToConfuseDoneTask(task);
575	>	checkCompletedNormally(task, two);
576		}
577
578		/**
579	<	*  Cancelling a task causes timed get in another thread to throw CancellationException
579	>	* set in one thread causes get in another thread to retrieve value
580		*/
581	<	public void testTimedGet_Cancellation() throws InterruptedException {
582	<	final FutureTask ft =
583	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
581	>	public void testGetSet() {
582	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
583	>
584	>	final PublicFutureTask task =
585	>	new PublicFutureTask(new CheckedCallable<Object>() {
586		public Object realCall() throws InterruptedException {
587	<	Thread.sleep(SMALL_DELAY_MS);
239	<	return Boolean.TRUE;
587	>	return two;
588		}});
589
590	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
590	>	Thread t1 = newStartedThread(new CheckedRunnable() {
591		public void realRun() throws Exception {
592	<	ft.get(MEDIUM_DELAY_MS, MILLISECONDS);
593	<	}};
594	<	Thread t2 = new Thread(ft);
595	<	t1.start();
596	<	t2.start();
597	<	Thread.sleep(SHORT_DELAY_MS);
598	<	ft.cancel(true);
599	<	t1.join();
600	<	t2.join();
592	>	pleaseSet.countDown();
593	>	assertSame(two, task.get());
594	>	}});
595	>
596	>	Thread t2 = newStartedThread(new CheckedRunnable() {
597	>	public void realRun() throws Exception {
598	>	pleaseSet.countDown();
599	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
600	>	}});
601	>
602	>	await(pleaseSet);
603	>	checkNotDone(task);
604	>	assertTrue(t1.isAlive());
605	>	assertTrue(t2.isAlive());
606	>	task.set(two);
607	>	assertEquals(0, task.runCount());
608	>	assertEquals(1, task.setCount());
609	>	assertEquals(0, task.setExceptionCount());
610	>	tryToConfuseDoneTask(task);
611	>	checkCompletedNormally(task, two);
612	>	awaitTermination(t1);
613	>	awaitTermination(t2);
614		}
615
616		/**
617	<	* Cancelling a task causes get in another thread to throw CancellationException
618	<	*/
619	<	public void testGet_Cancellation() throws InterruptedException {
620	<	final FutureTask ft =
621	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
622	<	public Object realCall() throws InterruptedException {
623	<	Thread.sleep(SMALL_DELAY_MS);
624	<	return Boolean.TRUE;
625	<	}});
626	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
627	<	public void realRun() throws Exception {
628	<	ft.get();
617	>	* Cancelling a task causes timed get in another thread to throw
618	>	* CancellationException
619	>	*/
620	>	public void testTimedGet_Cancellation() {
621	>	testTimedGet_Cancellation(false);
622	>	}
623	>	public void testTimedGet_Cancellation_interrupt() {
624	>	testTimedGet_Cancellation(true);
625	>	}
626	>	public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) {
627	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
628	>	final CountDownLatch cancelled = new CountDownLatch(1);
629	>	final Callable<Object> callable =
630	>	new CheckedCallable<Object>() {
631	>	public Object realCall() throws InterruptedException {
632	>	pleaseCancel.countDown();
633	>	if (mayInterruptIfRunning) {
634	>	try {
635	>	delay(2*LONG_DELAY_MS);
636	>	} catch (InterruptedException success) {}
637	>	} else {
638	>	await(cancelled);
639	>	}
640	>	return two;
641		}};
642	+	final PublicFutureTask task = new PublicFutureTask(callable);
643
644	<	Thread t2 = new Thread(ft);
644	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
645	>	public void realRun() throws Exception {
646	>	pleaseCancel.countDown();
647	>	task.get();
648	>	}};
649	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
650	>	public void realRun() throws Exception {
651	>	pleaseCancel.countDown();
652	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
653	>	}};
654		t1.start();
655		t2.start();
656	<	Thread.sleep(SHORT_DELAY_MS);
657	<	ft.cancel(true);
658	<	t1.join();
659	<	t2.join();
656	>	Thread t3 = newStartedThread(task);
657	>	await(pleaseCancel);
658	>	checkIsRunning(task);
659	>	task.cancel(mayInterruptIfRunning);
660	>	checkCancelled(task);
661	>	awaitTermination(t1);
662	>	awaitTermination(t2);
663	>	cancelled.countDown();
664	>	awaitTermination(t3);
665	>	assertEquals(1, task.runCount());
666	>	assertEquals(1, task.setCount());
667	>	assertEquals(0, task.setExceptionCount());
668	>	tryToConfuseDoneTask(task);
669	>	checkCancelled(task);
670		}
671
279	–
672		/**
673		* A runtime exception in task causes get to throw ExecutionException
674		*/
675		public void testGet_ExecutionException() throws InterruptedException {
676	<	final FutureTask ft = new FutureTask(new Callable() {
676	>	final ArithmeticException e = new ArithmeticException();
677	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
678		public Object call() {
679	<	return 5/0;
679	>	throw e;
680		}});
681
682	<	ft.run();
682	>	task.run();
683	>	assertEquals(1, task.runCount());
684	>	assertEquals(0, task.setCount());
685	>	assertEquals(1, task.setExceptionCount());
686		try {
687	<	ft.get();
687	>	task.get();
688		shouldThrow();
689		} catch (ExecutionException success) {
690	<	assertTrue(success.getCause() instanceof ArithmeticException);
690	>	assertSame(e, success.getCause());
691	>	tryToConfuseDoneTask(task);
692	>	checkCompletedAbnormally(task, success.getCause());
693		}
694		}
695
696		/**
697	<	*  A runtime exception in task causes timed get to throw ExecutionException
697	>	* A runtime exception in task causes timed get to throw ExecutionException
698		*/
699		public void testTimedGet_ExecutionException2() throws Exception {
700	<	final FutureTask ft = new FutureTask(new Callable() {
700	>	final ArithmeticException e = new ArithmeticException();
701	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
702		public Object call() {
703	<	return 5/0;
703	>	throw e;
704		}});
705
706	<	ft.run();
706	>	task.run();
707		try {
708	<	ft.get(SHORT_DELAY_MS, MILLISECONDS);
708	>	task.get(LONG_DELAY_MS, MILLISECONDS);
709		shouldThrow();
710		} catch (ExecutionException success) {
711	<	assertTrue(success.getCause() instanceof ArithmeticException);
711	>	assertSame(e, success.getCause());
712	>	tryToConfuseDoneTask(task);
713	>	checkCompletedAbnormally(task, success.getCause());
714		}
715		}
716
316	–
717		/**
718	<	* Interrupting a waiting get causes it to throw InterruptedException
718	>	* get is interruptible
719		*/
720	<	public void testGet_InterruptedException() throws InterruptedException {
721	<	final FutureTask ft = new FutureTask(new NoOpCallable());
722	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
720	>	public void testGet_interruptible() {
721	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
722	>	final FutureTask task = new FutureTask(new NoOpCallable());
723	>	Thread t = newStartedThread(new CheckedRunnable() {
724		public void realRun() throws Exception {
725	<	ft.get();
725	>	Thread.currentThread().interrupt();
726	>	try {
727	>	task.get();
728	>	shouldThrow();
729	>	} catch (InterruptedException success) {}
730	>	assertFalse(Thread.interrupted());
731	>
732	>	pleaseInterrupt.countDown();
733	>	try {
734	>	task.get();
735	>	shouldThrow();
736	>	} catch (InterruptedException success) {}
737	>	assertFalse(Thread.interrupted());
738		}});
739
740	<	t.start();
328	<	Thread.sleep(SHORT_DELAY_MS);
740	>	await(pleaseInterrupt);
741		t.interrupt();
742	<	t.join();
742	>	awaitTermination(t);
743	>	checkNotDone(task);
744		}
745
746		/**
747	<	*  Interrupting a waiting timed get causes it to throw InterruptedException
747	>	* timed get is interruptible
748		*/
749	<	public void testTimedGet_InterruptedException2() throws InterruptedException {
750	<	final FutureTask ft = new FutureTask(new NoOpCallable());
751	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
749	>	public void testTimedGet_interruptible() {
750	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
751	>	final FutureTask task = new FutureTask(new NoOpCallable());
752	>	Thread t = newStartedThread(new CheckedRunnable() {
753		public void realRun() throws Exception {
754	<	ft.get(LONG_DELAY_MS,MILLISECONDS);
754	>	Thread.currentThread().interrupt();
755	>	try {
756	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
757	>	shouldThrow();
758	>	} catch (InterruptedException success) {}
759	>	assertFalse(Thread.interrupted());
760	>
761	>	pleaseInterrupt.countDown();
762	>	try {
763	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
764	>	shouldThrow();
765	>	} catch (InterruptedException success) {}
766	>	assertFalse(Thread.interrupted());
767		}});
768
769	<	t.start();
344	<	Thread.sleep(SHORT_DELAY_MS);
769	>	await(pleaseInterrupt);
770		t.interrupt();
771	<	t.join();
771	>	awaitTermination(t);
772	>	checkNotDone(task);
773		}
774
775		/**
776		* A timed out timed get throws TimeoutException
777		*/
778		public void testGet_TimeoutException() throws Exception {
779	+	FutureTask task = new FutureTask(new NoOpCallable());
780	+	long startTime = System.nanoTime();
781		try {
782	<	FutureTask ft = new FutureTask(new NoOpCallable());
355	<	ft.get(1,MILLISECONDS);
782	>	task.get(timeoutMillis(), MILLISECONDS);
783		shouldThrow();
784	<	} catch (TimeoutException success) {}
784	>	} catch (TimeoutException success) {
785	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
786	>	}
787	>	}
788	>
789	>	/**
790	>	* timed get with null TimeUnit throws NullPointerException
791	>	*/
792	>	public void testGet_NullTimeUnit() throws Exception {
793	>	FutureTask task = new FutureTask(new NoOpCallable());
794	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
795	>
796	>	for (long timeout : timeouts) {
797	>	try {
798	>	task.get(timeout, null);
799	>	shouldThrow();
800	>	} catch (NullPointerException success) {}
801	>	}
802	>
803	>	task.run();
804	>
805	>	for (long timeout : timeouts) {
806	>	try {
807	>	task.get(timeout, null);
808	>	shouldThrow();
809	>	} catch (NullPointerException success) {}
810	>	}
811	>	}
812	>
813	>	/**
814	>	* timed get with most negative timeout works correctly (i.e. no
815	>	* underflow bug)
816	>	*/
817	>	public void testGet_NegativeInfinityTimeout() throws Exception {
818	>	final ExecutorService pool = Executors.newFixedThreadPool(10);
819	>	final Runnable nop = new Runnable() { public void run() {}};
820	>	final FutureTask<Void> task = new FutureTask<>(nop, null);
821	>	final List<Future<?>> futures = new ArrayList<>();
822	>	Runnable r = new Runnable() { public void run() {
823	>	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
824	>	try {
825	>	task.get(timeout, NANOSECONDS);
826	>	shouldThrow();
827	>	} catch (TimeoutException success) {
828	>	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
829	>	for (int i = 0; i < 10; i++)
830	>	futures.add(pool.submit(r));
831	>	try {
832	>	joinPool(pool);
833	>	for (Future<?> future : futures)
834	>	checkCompletedNormally(future, null);
835	>	} finally {
836	>	task.run();         // last resort to help terminate
837	>	}
838		}
839
840		}

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