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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.45 by jsr166, Sun May 14 00:56:43 2017 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/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 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	<	public class FutureTaskTest extends TestCase {
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);
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	<	private static long SHORT_DELAY_MS = 100;
135	<	private static long MEDIUM_DELAY_MS = 1000;
136	<	private static long LONG_DELAY_MS = 10000;
137	<
138	<	public void testIsDone(){
139	<	FutureTask task = new FutureTask( new Callable() {
26	<	public Object call() { return Boolean.TRUE; } });
27	<	task.run();
28	<	assertTrue(task.isDone());
29	<	assertFalse(task.isCancelled());
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	+	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 NullPointerException
232	+	*/
233	+	public void testConstructor() {
234	+	try {
235	+	new FutureTask(null);
236	+	shouldThrow();
237	+	} catch (NullPointerException success) {}
238	+	}
239	+
240	+	/**
241	+	* creating a future with null runnable throws NullPointerException
242	+	*/
243	+	public void testConstructor2() {
244	+	try {
245	+	new FutureTask(null, Boolean.TRUE);
246	+	shouldThrow();
247	+	} catch (NullPointerException success) {}
248	+	}
249	+
250	+	/**
251	+	* isDone is true when a task completes
252	+	*/
253	+	public void testIsDone() {
254	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
255	+	assertFalse(task.isDone());
256	+	task.run();
257	+	assertTrue(task.isDone());
258	+	checkCompletedNormally(task, Boolean.TRUE);
259	+	assertEquals(1, task.runCount());
260	+	}
261	+
262	+	/**
263	+	* runAndReset of a non-cancelled task succeeds
264	+	*/
265	+	public void testRunAndReset() {
266	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
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 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	+
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	+	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_get() throws Exception {
316	+	Exception nse = new NoSuchElementException();
317	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
318	+	task.setException(nse);
319	+
320	+	try {
321	+	task.get();
322	+	shouldThrow();
323	+	} catch (ExecutionException success) {
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	+	* cancel(false) before run succeeds
345	+	*/
346		public void testCancelBeforeRun() {
347	<	FutureTask task = new FutureTask( new Callable() {
34	<	public Object call() { return Boolean.TRUE; } });
347	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
348		assertTrue(task.cancel(false));
349	<	task.run();
350	<	assertTrue(task.isDone());
351	<	assertTrue(task.isCancelled());
349	>	task.run();
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
362	+	*/
363		public void testCancelBeforeRun2() {
364	<	FutureTask task = new FutureTask( new Callable() {
43	<	public Object call() { return Boolean.TRUE; } });
364	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
365		assertTrue(task.cancel(true));
366	<	task.run();
367	<	assertTrue(task.isDone());
368	<	assertTrue(task.isCancelled());
366	>	task.run();
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(false) of a completed task fails
379	+	*/
380		public void testCancelAfterRun() {
381	<	FutureTask task = new FutureTask( new Callable() {
382	<	public Object call() { return Boolean.TRUE; } });
53	<	task.run();
381	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
382	>	task.run();
383		assertFalse(task.cancel(false));
384	<	assertTrue(task.isDone());
385	<	assertFalse(task.isCancelled());
386	<	}
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) of a completed task fails
394	>	*/
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	<	public void testCancelInterrupt(){
424	<	FutureTask task = new FutureTask( new Callable() {
425	<	public Object call() {
423	>	Thread t = newStartedThread(task);
424	>	await(pleaseCancel);
425	>	assertTrue(task.cancel(true));
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	>
436	>	/**
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	>	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	>
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	<	Thread.sleep(SHORT_DELAY_MS* 2);
493	<	fail("should throw");
494	<	}
495	<	catch (InterruptedException success) {}
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	>	* cancel(false) does not interrupt a running task
513	>	*/
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	<	} });
525	<	Thread t = new  Thread(task);
526	<	t.start();
527	<
528	<	try{
529	<	Thread.sleep(SHORT_DELAY_MS);
530	<	assertTrue(task.cancel(true));
531	<	t.join();
532	<	assertTrue(task.isDone());
533	<	assertTrue(task.isCancelled());
534	<	} catch(InterruptedException e){
535	<	fail("unexpected exception");
524	>	}});
525	>
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	>	* run in one thread causes get in another thread to retrieve value
541	>	*/
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	>
551	>	Thread t1 = newStartedThread(new CheckedRunnable() {
552	>	public void realRun() throws Exception {
553	>	pleaseRun.countDown();
554	>	assertSame(two, task.get());
555	>	}});
556	>
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	>	* set in one thread causes get in another thread to retrieve value
580	>	*/
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	>	return two;
588	>	}});
589	>
590	>	Thread t1 = newStartedThread(new CheckedRunnable() {
591	>	public void realRun() throws Exception {
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 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 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 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	>
672	>	/**
673	>	* A runtime exception in task causes get to throw ExecutionException
674	>	*/
675	>	public void testGet_ExecutionException() throws InterruptedException {
676	>	final ArithmeticException e = new ArithmeticException();
677	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
678	>	public Object call() {
679	>	throw e;
680	>	}});
681	>
682	>	task.run();
683	>	assertEquals(1, task.runCount());
684	>	assertEquals(0, task.setCount());
685	>	assertEquals(1, task.setExceptionCount());
686	>	try {
687	>	task.get();
688	>	shouldThrow();
689	>	} catch (ExecutionException success) {
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
698	+	*/
699	+	public void testTimedGet_ExecutionException2() throws Exception {
700	+	final ArithmeticException e = new ArithmeticException();
701	+	final PublicFutureTask task = new PublicFutureTask(new Callable() {
702	+	public Object call() {
703	+	throw e;
704	+	}});
705
706	<	public void testCancelNoInterrupt(){
707	<	FutureTask task = new FutureTask( new Callable() {
708	<	public Object call() {
709	<	try {
710	<	Thread.sleep(SHORT_DELAY_MS* 2);
711	<	}
712	<	catch (InterruptedException success) {
713	<	fail("should not interrupt");
92	<	}
93	<	return Boolean.TRUE;
94	<	} });
95	<	Thread t = new  Thread(task);
96	<	t.start();
97	<
98	<	try{
99	<	Thread.sleep(SHORT_DELAY_MS);
100	<	assertTrue(task.cancel(false));
101	<	t.join();
102	<	assertTrue(task.isDone());
103	<	assertTrue(task.isCancelled());
104	<	} catch(InterruptedException e){
105	<	fail("unexpected exception");
706	>	task.run();
707	>	try {
708	>	task.get(LONG_DELAY_MS, MILLISECONDS);
709	>	shouldThrow();
710	>	} catch (ExecutionException success) {
711	>	assertSame(e, success.getCause());
712	>	tryToConfuseDoneTask(task);
713	>	checkCompletedAbnormally(task, success.getCause());
714		}
715		}
716
717	<	public void testGet1() {
718	<	final FutureTask ft = new FutureTask(new Callable(){
719	<	public Object call(){
720	<	try{
721	<	Thread.sleep(MEDIUM_DELAY_MS);
722	<	} catch(InterruptedException e){
723	<	fail("unexpected exception");
724	<	}
725	<	return Boolean.TRUE;
726	<	}
727	<	});
728	<	Thread t = new Thread(new Runnable(){
729	<	public void run(){
730	<	try{
731	<	ft.get();
732	<	} catch(Exception e){
733	<	fail("unexpected exception");
734	<	}
735	<	}
736	<	});
737	<	try{
738	<	assertFalse(ft.isDone());
739	<	assertFalse(ft.isCancelled());
740	<	t.start();
741	<	Thread.sleep(SHORT_DELAY_MS);
742	<	ft.run();
743	<	t.join();
744	<	assertTrue(ft.isDone());
745	<	assertFalse(ft.isCancelled());
746	<	} catch(InterruptedException e){
747	<	fail("unexpected exception");
748	<
749	<	}
750	<	}
751	<
752	<	public void testTimedGet1() {
753	<	final FutureTask ft = new FutureTask(new Callable(){
754	<	public Object call(){
755	<	try{
756	<	Thread.sleep(MEDIUM_DELAY_MS);
757	<	} catch(InterruptedException e){
758	<	fail("unexpected exception");
759	<	}
760	<	return Boolean.TRUE;
761	<	}
762	<	});
763	<	Thread t = new Thread(new Runnable(){
764	<	public void run(){
765	<	try{
766	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
767	<	} catch(TimeoutException success) {
768	<	} catch(Exception e){
769	<	fail("unexpected exception");
770	<	}
771	<	}
772	<	});
773	<	try{
774	<	assertFalse(ft.isDone());
775	<	assertFalse(ft.isCancelled());
776	<	t.start();
777	<	ft.run();
778	<	t.join();
779	<	assertTrue(ft.isDone());
780	<	assertFalse(ft.isCancelled());
781	<	} catch(InterruptedException e){
782	<	fail("unexpected exception");
783	<
784	<	}
717	>	/**
718	>	* get is interruptible
719	>	*/
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	>	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	>	await(pleaseInterrupt);
741	>	t.interrupt();
742	>	awaitTermination(t);
743	>	checkNotDone(task);
744	>	}
745	>
746	>	/**
747	>	* timed get is interruptible
748	>	*/
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	>	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	>	await(pleaseInterrupt);
770	>	t.interrupt();
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	>	task.get(timeoutMillis(), MILLISECONDS);
783	>	shouldThrow();
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	<	public void testGet_Cancellation(){
806	<	final FutureTask ft = new FutureTask(new Callable(){
807	<	public Object call(){
808	<	try{
809	<	Thread.sleep(MEDIUM_DELAY_MS);
810	<	} catch(InterruptedException e){
186	<	fail("unexpected exception");
187	<	}
188	<	return Boolean.TRUE;
189	<	}
190	<	});
191	<	try {
192	<	Thread.sleep(SHORT_DELAY_MS);
193	<	Thread t = new Thread(new Runnable(){
194	<	public void run(){
195	<	try{
196	<	ft.get();
197	<	fail("should throw");
198	<	} catch(CancellationException success){
199	<	}
200	<	catch(Exception e){
201	<	fail("unexpected exception");
202	<	}
203	<	}
204	<	});
205	<	t.start();
206	<	ft.cancel(true);
207	<	t.join();
208	<	} catch(InterruptedException success){
209	<	fail("unexpected exception");
210	<	}
211	<	}
212	<
213	<	public void testGet_Cancellation2(){
214	<	final FutureTask ft = new FutureTask(new Callable(){
215	<	public Object call(){
216	<	try{
217	<	Thread.sleep(SHORT_DELAY_MS);
218	<	} catch(InterruptedException e) {
219	<	fail("unexpected exception");
220	<	}
221	<	return Boolean.TRUE;
222	<	}
223	<	});
224	<	try{
225	<	Thread.sleep(100);
226	<	Thread t = new Thread(new Runnable(){
227	<	public void run(){
228	<	try{
229	<	ft.get(3 * SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
230	<	fail("should throw");
231	<	} catch(CancellationException success) {}
232	<	catch(Exception e){
233	<	fail("unexpected exception");
234	<	}
235	<	}
236	<	});
237	<	t.start();
238	<	Thread.sleep(SHORT_DELAY_MS);
239	<	ft.cancel(true);
240	<	Thread.sleep(SHORT_DELAY_MS);
241	<	t.join();
242	<	} catch(InterruptedException ie){
243	<	fail("unexpected exception");
244	<	}
245	<	}
246	<
247	<	public void testGet_ExecutionException(){
248	<	final FutureTask ft = new FutureTask(new Callable(){
249	<	public Object call(){
250	<	int i = 5/0;
251	<	return Boolean.TRUE;
252	<	}
253	<	});
254	<	try{
255	<	ft.run();
256	<	ft.get();
257	<	fail("should throw");
258	<	} catch(ExecutionException success){
259	<	}
260	<	catch(Exception e){
261	<	fail("unexpected exception");
262	<	}
263	<	}
264	<
265	<	public void testTimedGet_ExecutionException2(){
266	<	final FutureTask ft = new FutureTask(new Callable(){
267	<	public Object call(){
268	<	int i = 5/0;
269	<	return Boolean.TRUE;
270	<	}
271	<	});
272	<	try{
273	<	ft.run();
274	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
275	<	fail("should throw");
276	<	} catch(ExecutionException success) {
277	<	} catch(TimeoutException success) { } // unlikely but OK
278	<	catch(Exception e){
279	<	fail("unexpected exception");
280	<	}
281	<	}
282	<
283	<
284	<	public void testGet_InterruptedException(){
285	<	final FutureTask ft = new FutureTask(new Callable(){
286	<	public Object call(){
287	<	return new Object();
288	<	}
289	<	});
290	<	Thread t = new Thread(new Runnable(){
291	<	public void run(){
292	<	try{
293	<	ft.get();
294	<	fail("should throw");
295	<	} catch(InterruptedException success){
296	<	} catch(Exception e){
297	<	fail("unexpected exception");
298	<	}
299	<	}
300	<	});
301	<	try {
302	<	t.start();
303	<	Thread.sleep(SHORT_DELAY_MS);
304	<	t.interrupt();
305	<	t.join();
306	<	} catch(Exception e){
307	<	fail("unexpected exception");
308	<	}
309	<	}
310	<
311	<	public void testTimedGet_InterruptedException2(){
312	<	final FutureTask ft = new FutureTask(new Callable(){
313	<	public Object call(){
314	<	return new Object();
315	<	}
316	<	});
317	<	Thread t = new Thread(new Runnable(){
318	<	public void run(){
319	<	try{
320	<	ft.get(100,TimeUnit.SECONDS);
321	<	fail("should throw");
322	<	} catch(InterruptedException success){}
323	<	catch(Exception e){
324	<	fail("unexpected exception");
325	<	}
326	<	}
327	<	});
328	<	try {
329	<	t.start();
330	<	Thread.sleep(SHORT_DELAY_MS);
331	<	t.interrupt();
332	<	t.join();
333	<	} catch(Exception e){
334	<	fail("unexpected exception");
335	<	}
336	<	}
337	<
338	<	public void testGet_TimeoutException(){
339	<	FutureTask ft = new FutureTask(new Callable(){
340	<	public Object call(){
341	<	return new Object();
342	<	}
343	<	});
344	<	try{
345	<	ft.get(1,TimeUnit.MILLISECONDS);
346	<	fail("should throw");
347	<	} catch(TimeoutException success){}
348	<	catch(Exception success){
349	<	fail("unexpected exception");
350	<	}
351	<
352	<
805	>	for (long timeout : timeouts) {
806	>	try {
807	>	task.get(timeout, null);
808	>	shouldThrow();
809	>	} catch (NullPointerException success) {}
810	>	}
811		}
812	<
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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