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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.17 by jsr166, Sat Nov 21 10:25:05 2009 UTC vs.
Revision 1.34 by jsr166, Sat Dec 29 19:07:32 2012 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.*;
10	>	import java.util.concurrent.Callable;
11	>	import java.util.concurrent.CancellationException;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.ExecutionException;
14	>	import java.util.concurrent.Future;
15	>	import java.util.concurrent.FutureTask;
16	>	import java.util.concurrent.TimeoutException;
17	>	import java.util.concurrent.atomic.AtomicInteger;
18		import static java.util.concurrent.TimeUnit.MILLISECONDS;
19	+	import static java.util.concurrent.TimeUnit.SECONDS;
20		import java.util.*;
21
22		public class FutureTaskTest extends JSR166TestCase {
23
24		public static void main(String[] args) {
25	<	junit.textui.TestRunner.run (suite());
25	>	junit.textui.TestRunner.run(suite());
26		}
27		public static Test suite() {
28		return new TestSuite(FutureTaskTest.class);
29		}
30
31	+	void checkIsDone(Future<?> f) {
32	+	assertTrue(f.isDone());
33	+	assertFalse(f.cancel(false));
34	+	assertFalse(f.cancel(true));
35	+	if (f instanceof PublicFutureTask) {
36	+	PublicFutureTask pf = (PublicFutureTask) f;
37	+	assertEquals(1, pf.doneCount());
38	+	assertFalse(pf.runAndReset());
39	+	assertEquals(1, pf.doneCount());
40	+
41	+	// Check that run and runAndReset have no effect.
42	+	int savedRunCount = pf.runCount();
43	+	int savedSetCount = pf.setCount();
44	+	int savedSetExceptionCount = pf.setExceptionCount();
45	+	pf.run();
46	+	pf.runAndReset();
47	+	assertEquals(savedRunCount, pf.runCount());
48	+	assertEquals(savedSetCount, pf.setCount());
49	+	assertEquals(savedSetExceptionCount, pf.setExceptionCount());
50	+	assertTrue(f.isDone());
51	+	}
52	+	}
53	+
54	+	void checkNotDone(Future<?> f) {
55	+	assertFalse(f.isDone());
56	+	assertFalse(f.isCancelled());
57	+	if (f instanceof PublicFutureTask) {
58	+	PublicFutureTask pf = (PublicFutureTask) f;
59	+	assertEquals(0, pf.doneCount());
60	+	assertEquals(0, pf.setCount());
61	+	assertEquals(0, pf.setExceptionCount());
62	+	}
63	+	}
64	+
65	+	void checkIsRunning(Future<?> f) {
66	+	checkNotDone(f);
67	+	if (f instanceof FutureTask) {
68	+	FutureTask ft = (FutureTask<?>) f;
69	+	// Check that run methods do nothing
70	+	ft.run();
71	+	if (f instanceof PublicFutureTask)
72	+	assertFalse(((PublicFutureTask) f).runAndReset());
73	+	checkNotDone(f);
74	+	}
75	+	}
76	+
77	+	<T> void checkCompletedNormally(Future<T> f, T expected) {
78	+	checkIsDone(f);
79	+	assertFalse(f.isCancelled());
80	+
81	+	try {
82	+	assertSame(expected, f.get());
83	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
84	+	try {
85	+	assertSame(expected, f.get(5L, SECONDS));
86	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
87	+	}
88	+
89	+	void checkCancelled(Future<?> f) {
90	+	checkIsDone(f);
91	+	assertTrue(f.isCancelled());
92	+
93	+	try {
94	+	f.get();
95	+	shouldThrow();
96	+	} catch (CancellationException success) {
97	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
98	+
99	+	try {
100	+	f.get(5L, SECONDS);
101	+	shouldThrow();
102	+	} catch (CancellationException success) {
103	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
104	+	}
105	+
106	+	void tryToConfuseDoneTask(PublicFutureTask pf) {
107	+	pf.set(new Object());
108	+	pf.setException(new Error());
109	+	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
110	+	pf.cancel(true);
111	+	}
112	+	}
113	+
114	+	void checkCompletedAbnormally(Future<?> f, Throwable t) {
115	+	checkIsDone(f);
116	+	assertFalse(f.isCancelled());
117	+
118	+	try {
119	+	f.get();
120	+	shouldThrow();
121	+	} catch (ExecutionException success) {
122	+	assertSame(t, success.getCause());
123	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
124	+
125	+	try {
126	+	f.get(5L, SECONDS);
127	+	shouldThrow();
128	+	} catch (ExecutionException success) {
129	+	assertSame(t, success.getCause());
130	+	} catch (Throwable fail) { threadUnexpectedException(fail); }
131	+	}
132	+
133		/**
134		* Subclass to expose protected methods
135		*/
136		static class PublicFutureTask extends FutureTask {
137	<	public PublicFutureTask(Callable r) { super(r); }
138	<	public boolean runAndReset() { return super.runAndReset(); }
139	<	public void set(Object x) { super.set(x); }
140	<	public void setException(Throwable t) { super.setException(t); }
137	>	private final AtomicInteger runCount;
138	>	private final AtomicInteger doneCount = new AtomicInteger(0);
139	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
140	>	private final AtomicInteger setCount = new AtomicInteger(0);
141	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
142	>	public int runCount() { return runCount.get(); }
143	>	public int doneCount() { return doneCount.get(); }
144	>	public int runAndResetCount() { return runAndResetCount.get(); }
145	>	public int setCount() { return setCount.get(); }
146	>	public int setExceptionCount() { return setExceptionCount.get(); }
147	>
148	>	PublicFutureTask(Runnable runnable) {
149	>	this(runnable, seven);
150	>	}
151	>	PublicFutureTask(Runnable runnable, Object result) {
152	>	this(runnable, result, new AtomicInteger(0));
153	>	}
154	>	private PublicFutureTask(final Runnable runnable, Object result,
155	>	final AtomicInteger runCount) {
156	>	super(new Runnable() {
157	>	public void run() {
158	>	runCount.getAndIncrement();
159	>	runnable.run();
160	>	}}, result);
161	>	this.runCount = runCount;
162	>	}
163	>	PublicFutureTask(Callable callable) {
164	>	this(callable, new AtomicInteger(0));
165	>	}
166	>	private PublicFutureTask(final Callable callable,
167	>	final AtomicInteger runCount) {
168	>	super(new Callable() {
169	>	public Object call() throws Exception {
170	>	runCount.getAndIncrement();
171	>	return callable.call();
172	>	}});
173	>	this.runCount = runCount;
174	>	}
175	>	@Override public void done() {
176	>	assertTrue(isDone());
177	>	doneCount.incrementAndGet();
178	>	super.done();
179	>	}
180	>	@Override public boolean runAndReset() {
181	>	runAndResetCount.incrementAndGet();
182	>	return super.runAndReset();
183	>	}
184	>	@Override public void set(Object x) {
185	>	setCount.incrementAndGet();
186	>	super.set(x);
187	>	}
188	>	@Override public void setException(Throwable t) {
189	>	setExceptionCount.incrementAndGet();
190	>	super.setException(t);
191	>	}
192	>	}
193	>
194	>	class Counter extends CheckedRunnable {
195	>	final AtomicInteger count = new AtomicInteger(0);
196	>	public int get() { return count.get(); }
197	>	public void realRun() {
198	>	count.getAndIncrement();
199	>	}
200		}
201
202		/**
203	<	* Creating a future with a null callable throws NPE
203	>	* creating a future with a null callable throws NullPointerException
204		*/
205		public void testConstructor() {
206		try {
207	<	FutureTask task = new FutureTask(null);
207	>	new FutureTask(null);
208		shouldThrow();
209		} catch (NullPointerException success) {}
210		}
211
212		/**
213	<	* creating a future with null runnable fails
213	>	* creating a future with null runnable throws NullPointerException
214		*/
215		public void testConstructor2() {
216		try {
217	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
217	>	new FutureTask(null, Boolean.TRUE);
218		shouldThrow();
219		} catch (NullPointerException success) {}
220		}
#	Line 54 | Line 223 | public class FutureTaskTest extends JSR1
223		* isDone is true when a task completes
224		*/
225		public void testIsDone() {
226	<	FutureTask task = new FutureTask(new NoOpCallable());
226	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
227	>	assertFalse(task.isDone());
228		task.run();
229		assertTrue(task.isDone());
230	<	assertFalse(task.isCancelled());
230	>	checkCompletedNormally(task, Boolean.TRUE);
231	>	assertEquals(1, task.runCount());
232		}
233
234		/**
#	Line 65 | Line 236 | public class FutureTaskTest extends JSR1
236		*/
237		public void testRunAndReset() {
238		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
239	<	assertTrue(task.runAndReset());
240	<	assertFalse(task.isDone());
239	>	for (int i = 0; i < 3; i++) {
240	>	assertTrue(task.runAndReset());
241	>	checkNotDone(task);
242	>	assertEquals(i+1, task.runCount());
243	>	assertEquals(i+1, task.runAndResetCount());
244	>	assertEquals(0, task.setCount());
245	>	assertEquals(0, task.setExceptionCount());
246	>	}
247		}
248
249		/**
250		* runAndReset after cancellation fails
251		*/
252	<	public void testResetAfterCancel() {
253	<	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
254	<	assertTrue(task.cancel(false));
255	<	assertFalse(task.runAndReset());
256	<	assertTrue(task.isDone());
257	<	assertTrue(task.isCancelled());
252	>	public void testRunAndResetAfterCancel() {
253	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
254	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
255	>	assertTrue(task.cancel(mayInterruptIfRunning));
256	>	for (int i = 0; i < 3; i++) {
257	>	assertFalse(task.runAndReset());
258	>	assertEquals(0, task.runCount());
259	>	assertEquals(i+1, task.runAndResetCount());
260	>	assertEquals(0, task.setCount());
261	>	assertEquals(0, task.setExceptionCount());
262	>	}
263	>	tryToConfuseDoneTask(task);
264	>	checkCancelled(task);
265	>	}
266		}
267
83	–
84	–
268		/**
269		* setting value causes get to return it
270		*/
271		public void testSet() throws Exception {
272		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
273		task.set(one);
274	<	assertEquals(task.get(), one);
274	>	for (int i = 0; i < 3; i++) {
275	>	assertSame(one, task.get());
276	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
277	>	assertEquals(1, task.setCount());
278	>	}
279	>	tryToConfuseDoneTask(task);
280	>	checkCompletedNormally(task, one);
281	>	assertEquals(0, task.runCount());
282		}
283
284		/**
285		* setException causes get to throw ExecutionException
286		*/
287	<	public void testSetException() throws Exception {
287	>	public void testSetException_get() throws Exception {
288		Exception nse = new NoSuchElementException();
289		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
290		task.setException(nse);
291	+
292	+	try {
293	+	task.get();
294	+	shouldThrow();
295	+	} catch (ExecutionException success) {
296	+	assertSame(nse, success.getCause());
297	+	checkCompletedAbnormally(task, nse);
298	+	}
299	+
300		try {
301	<	Object x = task.get();
301	>	task.get(LONG_DELAY_MS, MILLISECONDS);
302		shouldThrow();
303		} catch (ExecutionException success) {
304	<	assertSame(success.getCause(), nse);
304	>	assertSame(nse, success.getCause());
305	>	checkCompletedAbnormally(task, nse);
306		}
307	+
308	+	assertEquals(1, task.setExceptionCount());
309	+	assertEquals(0, task.setCount());
310	+	tryToConfuseDoneTask(task);
311	+	checkCompletedAbnormally(task, nse);
312	+	assertEquals(0, task.runCount());
313		}
314
315		/**
316	<	*  Cancelling before running succeeds
316	>	* cancel(false) before run succeeds
317		*/
318		public void testCancelBeforeRun() {
319	<	FutureTask task = new FutureTask(new NoOpCallable());
319	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
320		assertTrue(task.cancel(false));
321		task.run();
322	<	assertTrue(task.isDone());
322	>	assertEquals(0, task.runCount());
323	>	assertEquals(0, task.setCount());
324	>	assertEquals(0, task.setExceptionCount());
325		assertTrue(task.isCancelled());
326	+	assertTrue(task.isDone());
327	+	tryToConfuseDoneTask(task);
328	+	assertEquals(0, task.runCount());
329	+	checkCancelled(task);
330		}
331
332		/**
333	<	* Cancel(true) before run succeeds
333	>	* cancel(true) before run succeeds
334		*/
335		public void testCancelBeforeRun2() {
336	<	FutureTask task = new FutureTask(new NoOpCallable());
336	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
337		assertTrue(task.cancel(true));
338		task.run();
339	<	assertTrue(task.isDone());
339	>	assertEquals(0, task.runCount());
340	>	assertEquals(0, task.setCount());
341	>	assertEquals(0, task.setExceptionCount());
342		assertTrue(task.isCancelled());
343	+	assertTrue(task.isDone());
344	+	tryToConfuseDoneTask(task);
345	+	assertEquals(0, task.runCount());
346	+	checkCancelled(task);
347		}
348
349		/**
350	<	* cancel of a completed task fails
350	>	* cancel(false) of a completed task fails
351		*/
352		public void testCancelAfterRun() {
353	<	FutureTask task = new FutureTask(new NoOpCallable());
353	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
354		task.run();
355		assertFalse(task.cancel(false));
356	<	assertTrue(task.isDone());
357	<	assertFalse(task.isCancelled());
356	>	assertEquals(1, task.runCount());
357	>	assertEquals(1, task.setCount());
358	>	assertEquals(0, task.setExceptionCount());
359	>	tryToConfuseDoneTask(task);
360	>	checkCompletedNormally(task, Boolean.TRUE);
361	>	assertEquals(1, task.runCount());
362		}
363
364		/**
365	<	* cancel(true) interrupts a running task
365	>	* cancel(true) of a completed task fails
366		*/
367	<	public void testCancelInterrupt() throws InterruptedException {
368	<	final FutureTask task =
369	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
370	<	public Object realCall() throws InterruptedException {
371	<	Thread.sleep(SMALL_DELAY_MS);
372	<	return Boolean.TRUE;
367	>	public void testCancelAfterRun2() {
368	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
369	>	task.run();
370	>	assertFalse(task.cancel(true));
371	>	assertEquals(1, task.runCount());
372	>	assertEquals(1, task.setCount());
373	>	assertEquals(0, task.setExceptionCount());
374	>	tryToConfuseDoneTask(task);
375	>	checkCompletedNormally(task, Boolean.TRUE);
376	>	assertEquals(1, task.runCount());
377	>	}
378	>
379	>	/**
380	>	* cancel(true) interrupts a running task that subsequently succeeds
381	>	*/
382	>	public void testCancelInterrupt() {
383	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
384	>	final PublicFutureTask task =
385	>	new PublicFutureTask(new CheckedRunnable() {
386	>	public void realRun() {
387	>	pleaseCancel.countDown();
388	>	try {
389	>	delay(LONG_DELAY_MS);
390	>	shouldThrow();
391	>	} catch (InterruptedException success) {}
392		}});
393
394	<	Thread t = new Thread(task);
395	<	t.start();
155	<	Thread.sleep(SHORT_DELAY_MS);
394	>	Thread t = newStartedThread(task);
395	>	await(pleaseCancel);
396		assertTrue(task.cancel(true));
157	–	t.join();
158	–	assertTrue(task.isDone());
397		assertTrue(task.isCancelled());
398	+	assertTrue(task.isDone());
399	+	awaitTermination(t);
400	+	assertEquals(1, task.runCount());
401	+	assertEquals(1, task.setCount());
402	+	assertEquals(0, task.setExceptionCount());
403	+	tryToConfuseDoneTask(task);
404	+	checkCancelled(task);
405		}
406
162	–
407		/**
408	<	* cancel(false) does not interrupt a running task
409	<	*/
410	<	public void testCancelNoInterrupt() throws InterruptedException {
411	<	final FutureTask task =
412	<	new FutureTask(new CheckedCallable<Object>() {
413	<	public Object realCall() throws InterruptedException {
414	<	Thread.sleep(MEDIUM_DELAY_MS);
415	<	return Boolean.TRUE;
408	>	* cancel(true) tries to interrupt a running task, but
409	>	* Thread.interrupt throws (simulating a restrictive security
410	>	* manager)
411	>	*/
412	>	public void testCancelInterrupt_ThrowsSecurityException() {
413	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
414	>	final CountDownLatch cancelled = new CountDownLatch(1);
415	>	final PublicFutureTask task =
416	>	new PublicFutureTask(new CheckedRunnable() {
417	>	public void realRun() {
418	>	pleaseCancel.countDown();
419	>	await(cancelled);
420	>	assertFalse(Thread.interrupted());
421		}});
422
423	<	Thread t = new Thread(task);
423	>	final Thread t = new Thread(task) {
424	>	// Simulate a restrictive security manager.
425	>	@Override public void interrupt() {
426	>	throw new SecurityException();
427	>	}};
428	>	t.setDaemon(true);
429		t.start();
430	<	Thread.sleep(SHORT_DELAY_MS);
431	<	assertTrue(task.cancel(false));
432	<	t.join();
433	<	assertTrue(task.isDone());
430	>
431	>	await(pleaseCancel);
432	>	try {
433	>	task.cancel(true);
434	>	shouldThrow();
435	>	} catch (SecurityException expected) {}
436	>
437	>	// We failed to deliver the interrupt, but the world retains
438	>	// its sanity, as if we had done task.cancel(false)
439		assertTrue(task.isCancelled());
440	+	assertTrue(task.isDone());
441	+	assertEquals(1, task.runCount());
442	+	assertEquals(1, task.doneCount());
443	+	assertEquals(0, task.setCount());
444	+	assertEquals(0, task.setExceptionCount());
445	+	cancelled.countDown();
446	+	awaitTermination(t);
447	+	assertEquals(1, task.setCount());
448	+	assertEquals(0, task.setExceptionCount());
449	+	tryToConfuseDoneTask(task);
450	+	checkCancelled(task);
451		}
452
453		/**
454	<	* set in one thread causes get in another thread to retrieve value
455	<	*/
456	<	public void testGet1() throws InterruptedException {
457	<	final FutureTask ft =
458	<	new FutureTask(new CheckedCallable<Object>() {
459	<	public Object realCall() throws InterruptedException {
460	<	return Boolean.TRUE;
454	>	* cancel(true) interrupts a running task that subsequently throws
455	>	*/
456	>	public void testCancelInterrupt_taskFails() {
457	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
458	>	final PublicFutureTask task =
459	>	new PublicFutureTask(new Runnable() {
460	>	public void run() {
461	>	try {
462	>	pleaseCancel.countDown();
463	>	delay(LONG_DELAY_MS);
464	>	} finally { throw new RuntimeException(); }
465		}});
192	–	Thread t = new Thread(new CheckedRunnable() {
193	–	public void realRun() throws Exception {
194	–	assertSame(Boolean.TRUE, ft.get());
195	–	}});
466
467	<	assertFalse(ft.isDone());
468	<	assertFalse(ft.isCancelled());
469	<	t.start();
470	<	Thread.sleep(SHORT_DELAY_MS);
471	<	ft.run();
472	<	t.join();
473	<	assertTrue(ft.isDone());
474	<	assertFalse(ft.isCancelled());
467	>	Thread t = newStartedThread(task);
468	>	await(pleaseCancel);
469	>	assertTrue(task.cancel(true));
470	>	assertTrue(task.isCancelled());
471	>	awaitTermination(t);
472	>	assertEquals(1, task.runCount());
473	>	assertEquals(0, task.setCount());
474	>	assertEquals(1, task.setExceptionCount());
475	>	tryToConfuseDoneTask(task);
476	>	checkCancelled(task);
477		}
478
479		/**
480	<	* set in one thread causes timed get in another thread to retrieve value
480	>	* cancel(false) does not interrupt a running task
481		*/
482	<	public void testTimedGet1() throws InterruptedException {
483	<	final FutureTask ft =
484	<	new FutureTask(new CheckedCallable<Object>() {
485	<	public Object realCall() throws InterruptedException {
482	>	public void testCancelNoInterrupt() {
483	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
484	>	final CountDownLatch cancelled = new CountDownLatch(1);
485	>	final PublicFutureTask task =
486	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
487	>	public Boolean realCall() {
488	>	pleaseCancel.countDown();
489	>	await(cancelled);
490	>	assertFalse(Thread.interrupted());
491		return Boolean.TRUE;
492		}});
216	–	Thread t = new Thread(new CheckedRunnable() {
217	–	public void realRun() throws Exception {
218	–	assertSame(Boolean.TRUE, ft.get(SMALL_DELAY_MS, MILLISECONDS));
219	–	}});
493
494	<	assertFalse(ft.isDone());
495	<	assertFalse(ft.isCancelled());
496	<	t.start();
497	<	Thread.sleep(SHORT_DELAY_MS);
498	<	ft.run();
499	<	t.join();
500	<	assertTrue(ft.isDone());
501	<	assertFalse(ft.isCancelled());
494	>	Thread t = newStartedThread(task);
495	>	await(pleaseCancel);
496	>	assertTrue(task.cancel(false));
497	>	assertTrue(task.isCancelled());
498	>	cancelled.countDown();
499	>	awaitTermination(t);
500	>	assertEquals(1, task.runCount());
501	>	assertEquals(1, task.setCount());
502	>	assertEquals(0, task.setExceptionCount());
503	>	tryToConfuseDoneTask(task);
504	>	checkCancelled(task);
505		}
506
507		/**
508	<	*  Cancelling a task causes timed get in another thread to throw CancellationException
508	>	* run in one thread causes get in another thread to retrieve value
509		*/
510	<	public void testTimedGet_Cancellation() throws InterruptedException {
511	<	final FutureTask ft =
512	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
513	<	public Object realCall() throws InterruptedException {
514	<	Thread.sleep(SMALL_DELAY_MS);
515	<	return Boolean.TRUE;
510	>	public void testGetRun() {
511	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
512	>
513	>	final PublicFutureTask task =
514	>	new PublicFutureTask(new CheckedCallable<Object>() {
515	>	public Object realCall() {
516	>	return two;
517		}});
518
519	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
519	>	Thread t1 = newStartedThread(new CheckedRunnable() {
520		public void realRun() throws Exception {
521	<	ft.get(MEDIUM_DELAY_MS, MILLISECONDS);
522	<	}};
523	<	Thread t2 = new Thread(ft);
524	<	t1.start();
525	<	t2.start();
526	<	Thread.sleep(SHORT_DELAY_MS);
527	<	ft.cancel(true);
528	<	t1.join();
529	<	t2.join();
521	>	pleaseRun.countDown();
522	>	assertSame(two, task.get());
523	>	}});
524	>
525	>	Thread t2 = newStartedThread(new CheckedRunnable() {
526	>	public void realRun() throws Exception {
527	>	pleaseRun.countDown();
528	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
529	>	}});
530	>
531	>	await(pleaseRun);
532	>	checkNotDone(task);
533	>	assertTrue(t1.isAlive());
534	>	assertTrue(t2.isAlive());
535	>	task.run();
536	>	checkCompletedNormally(task, two);
537	>	assertEquals(1, task.runCount());
538	>	assertEquals(1, task.setCount());
539	>	assertEquals(0, task.setExceptionCount());
540	>	awaitTermination(t1);
541	>	awaitTermination(t2);
542	>	tryToConfuseDoneTask(task);
543	>	checkCompletedNormally(task, two);
544		}
545
546		/**
547	<	* Cancelling a task causes get in another thread to throw CancellationException
547	>	* set in one thread causes get in another thread to retrieve value
548		*/
549	<	public void testGet_Cancellation() throws InterruptedException {
550	<	final FutureTask ft =
551	<	new FutureTask(new CheckedInterruptedCallable<Object>() {
549	>	public void testGetSet() {
550	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
551	>
552	>	final PublicFutureTask task =
553	>	new PublicFutureTask(new CheckedCallable<Object>() {
554		public Object realCall() throws InterruptedException {
555	<	Thread.sleep(SMALL_DELAY_MS);
263	<	return Boolean.TRUE;
555	>	return two;
556		}});
557	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
557	>
558	>	Thread t1 = newStartedThread(new CheckedRunnable() {
559		public void realRun() throws Exception {
560	<	ft.get();
561	<	}};
560	>	pleaseSet.countDown();
561	>	assertSame(two, task.get());
562	>	}});
563
564	<	Thread t2 = new Thread(ft);
565	<	t1.start();
566	<	t2.start();
567	<	Thread.sleep(SHORT_DELAY_MS);
568	<	ft.cancel(true);
569	<	t1.join();
570	<	t2.join();
564	>	Thread t2 = newStartedThread(new CheckedRunnable() {
565	>	public void realRun() throws Exception {
566	>	pleaseSet.countDown();
567	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
568	>	}});
569	>
570	>	await(pleaseSet);
571	>	checkNotDone(task);
572	>	assertTrue(t1.isAlive());
573	>	assertTrue(t2.isAlive());
574	>	task.set(two);
575	>	assertEquals(0, task.runCount());
576	>	assertEquals(1, task.setCount());
577	>	assertEquals(0, task.setExceptionCount());
578	>	tryToConfuseDoneTask(task);
579	>	checkCompletedNormally(task, two);
580	>	awaitTermination(t1);
581	>	awaitTermination(t2);
582		}
583
584	+	/**
585	+	* Cancelling a task causes timed get in another thread to throw
586	+	* CancellationException
587	+	*/
588	+	public void testTimedGet_Cancellation() {
589	+	for (final boolean mayInterruptIfRunning :
590	+	new boolean[] { true, false }) {
591	+	final CountDownLatch pleaseCancel = new CountDownLatch(3);
592	+	final CountDownLatch cancelled = new CountDownLatch(1);
593	+	final PublicFutureTask task =
594	+	new PublicFutureTask(new CheckedCallable<Object>() {
595	+	public Object realCall() throws InterruptedException {
596	+	pleaseCancel.countDown();
597	+	if (mayInterruptIfRunning) {
598	+	try {
599	+	delay(2*LONG_DELAY_MS);
600	+	} catch (InterruptedException success) {}
601	+	} else {
602	+	await(cancelled);
603	+	}
604	+	return two;
605	+	}});
606	+
607	+	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
608	+	public void realRun() throws Exception {
609	+	pleaseCancel.countDown();
610	+	task.get();
611	+	}};
612	+	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
613	+	public void realRun() throws Exception {
614	+	pleaseCancel.countDown();
615	+	task.get(2*LONG_DELAY_MS, MILLISECONDS);
616	+	}};
617	+	t1.start();
618	+	t2.start();
619	+	Thread t3 = newStartedThread(task);
620	+	await(pleaseCancel);
621	+	checkIsRunning(task);
622	+	task.cancel(mayInterruptIfRunning);
623	+	checkCancelled(task);
624	+	awaitTermination(t1);
625	+	awaitTermination(t2);
626	+	cancelled.countDown();
627	+	awaitTermination(t3);
628	+	assertEquals(1, task.runCount());
629	+	assertEquals(1, task.setCount());
630	+	assertEquals(0, task.setExceptionCount());
631	+	tryToConfuseDoneTask(task);
632	+	checkCancelled(task);
633	+	}
634	+	}
635
636		/**
637		* A runtime exception in task causes get to throw ExecutionException
638		*/
639		public void testGet_ExecutionException() throws InterruptedException {
640	<	final FutureTask ft = new FutureTask(new Callable() {
640	>	final ArithmeticException e = new ArithmeticException();
641	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
642		public Object call() {
643	<	return 5/0;
643	>	throw e;
644		}});
645
646	<	ft.run();
646	>	task.run();
647	>	assertEquals(1, task.runCount());
648	>	assertEquals(0, task.setCount());
649	>	assertEquals(1, task.setExceptionCount());
650		try {
651	<	ft.get();
651	>	task.get();
652		shouldThrow();
653		} catch (ExecutionException success) {
654	<	assertTrue(success.getCause() instanceof ArithmeticException);
654	>	assertSame(e, success.getCause());
655	>	tryToConfuseDoneTask(task);
656	>	checkCompletedAbnormally(task, success.getCause());
657		}
658		}
659
660		/**
661	<	*  A runtime exception in task causes timed get to throw ExecutionException
661	>	* A runtime exception in task causes timed get to throw ExecutionException
662		*/
663		public void testTimedGet_ExecutionException2() throws Exception {
664	<	final FutureTask ft = new FutureTask(new Callable() {
664	>	final ArithmeticException e = new ArithmeticException();
665	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
666		public Object call() {
667	<	return 5/0;
667	>	throw e;
668		}});
669
670	<	ft.run();
670	>	task.run();
671		try {
672	<	ft.get(SHORT_DELAY_MS, MILLISECONDS);
672	>	task.get(LONG_DELAY_MS, MILLISECONDS);
673		shouldThrow();
674		} catch (ExecutionException success) {
675	<	assertTrue(success.getCause() instanceof ArithmeticException);
675	>	assertSame(e, success.getCause());
676	>	tryToConfuseDoneTask(task);
677	>	checkCompletedAbnormally(task, success.getCause());
678		}
679		}
680
316	–
681		/**
682	<	* Interrupting a waiting get causes it to throw InterruptedException
682	>	* get is interruptible
683		*/
684	<	public void testGet_InterruptedException() throws InterruptedException {
685	<	final FutureTask ft = new FutureTask(new NoOpCallable());
686	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
684	>	public void testGet_interruptible() {
685	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
686	>	final FutureTask task = new FutureTask(new NoOpCallable());
687	>	Thread t = newStartedThread(new CheckedRunnable() {
688		public void realRun() throws Exception {
689	<	ft.get();
689	>	Thread.currentThread().interrupt();
690	>	try {
691	>	task.get();
692	>	shouldThrow();
693	>	} catch (InterruptedException success) {}
694	>	assertFalse(Thread.interrupted());
695	>
696	>	pleaseInterrupt.countDown();
697	>	try {
698	>	task.get();
699	>	shouldThrow();
700	>	} catch (InterruptedException success) {}
701	>	assertFalse(Thread.interrupted());
702		}});
703
704	<	t.start();
328	<	Thread.sleep(SHORT_DELAY_MS);
704	>	await(pleaseInterrupt);
705		t.interrupt();
706	<	t.join();
706	>	awaitTermination(t);
707	>	checkNotDone(task);
708		}
709
710		/**
711	<	*  Interrupting a waiting timed get causes it to throw InterruptedException
711	>	* timed get is interruptible
712		*/
713	<	public void testTimedGet_InterruptedException2() throws InterruptedException {
714	<	final FutureTask ft = new FutureTask(new NoOpCallable());
715	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
713	>	public void testTimedGet_interruptible() {
714	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
715	>	final FutureTask task = new FutureTask(new NoOpCallable());
716	>	Thread t = newStartedThread(new CheckedRunnable() {
717		public void realRun() throws Exception {
718	<	ft.get(LONG_DELAY_MS,MILLISECONDS);
718	>	Thread.currentThread().interrupt();
719	>	try {
720	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
721	>	shouldThrow();
722	>	} catch (InterruptedException success) {}
723	>	assertFalse(Thread.interrupted());
724	>
725	>	pleaseInterrupt.countDown();
726	>	try {
727	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
728	>	shouldThrow();
729	>	} catch (InterruptedException success) {}
730	>	assertFalse(Thread.interrupted());
731		}});
732
733	<	t.start();
344	<	Thread.sleep(SHORT_DELAY_MS);
733	>	await(pleaseInterrupt);
734		t.interrupt();
735	<	t.join();
735	>	awaitTermination(t);
736	>	checkNotDone(task);
737		}
738
739		/**
740		* A timed out timed get throws TimeoutException
741		*/
742		public void testGet_TimeoutException() throws Exception {
743	+	FutureTask task = new FutureTask(new NoOpCallable());
744	+	long startTime = System.nanoTime();
745		try {
746	<	FutureTask ft = new FutureTask(new NoOpCallable());
355	<	ft.get(1,MILLISECONDS);
746	>	task.get(timeoutMillis(), MILLISECONDS);
747		shouldThrow();
748	<	} catch (TimeoutException success) {}
748	>	} catch (TimeoutException success) {
749	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
750	>	}
751	>	}
752	>
753	>	/**
754	>	* timed get with null TimeUnit throws NullPointerException
755	>	*/
756	>	public void testGet_NullTimeUnit() throws Exception {
757	>	FutureTask task = new FutureTask(new NoOpCallable());
758	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
759	>
760	>	for (long timeout : timeouts) {
761	>	try {
762	>	task.get(timeout, null);
763	>	shouldThrow();
764	>	} catch (NullPointerException success) {}
765	>	}
766	>
767	>	task.run();
768	>
769	>	for (long timeout : timeouts) {
770	>	try {
771	>	task.get(timeout, null);
772	>	shouldThrow();
773	>	} catch (NullPointerException success) {}
774	>	}
775		}
776
777		}

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