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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.6 by dl, Thu Sep 25 11:02:41 2003 UTC vs.
Revision 1.57 by dl, Tue Jan 26 13:33:06 2021 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.*;
11	<	import java.util.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>	import static java.util.concurrent.TimeUnit.NANOSECONDS;
11	>
12	>	import java.util.ArrayList;
13	>	import java.util.List;
14	>	import java.util.NoSuchElementException;
15	>	import java.util.concurrent.Callable;
16	>	import java.util.concurrent.CancellationException;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.ExecutionException;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21	>	import java.util.concurrent.Future;
22	>	import java.util.concurrent.FutureTask;
23	>	import java.util.concurrent.TimeoutException;
24	>	import java.util.concurrent.atomic.AtomicInteger;
25	>
26	>	import junit.framework.Test;
27	>	import junit.framework.TestSuite;
28
29		public class FutureTaskTest extends JSR166TestCase {
30
31		public static void main(String[] args) {
32	<	junit.textui.TestRunner.run (suite());
32	>	main(suite(), args);
33		}
34		public static Test suite() {
35	<	return new TestSuite(FutureTaskTest.class);
35	>	return new TestSuite(FutureTaskTest.class);
36	>	}
37	>
38	>	void checkIsDone(Future<?> f) {
39	>	assertTrue(f.isDone());
40	>	assertFalse(f.cancel(false));
41	>	assertFalse(f.cancel(true));
42	>	if (f instanceof PublicFutureTask) {
43	>	PublicFutureTask pf = (PublicFutureTask) f;
44	>	assertEquals(1, pf.doneCount());
45	>	assertFalse(pf.runAndReset());
46	>	assertEquals(1, pf.doneCount());
47	>	Object r = null; Object exInfo = null;
48	>	try {
49	>	r = f.get();
50	>	} catch (CancellationException t) {
51	>	exInfo = CancellationException.class;
52	>	} catch (ExecutionException t) {
53	>	exInfo = t.getCause();
54	>	} catch (Throwable t) {
55	>	threadUnexpectedException(t);
56	>	}
57	>
58	>	// Check that run and runAndReset have no effect.
59	>	int savedRunCount = pf.runCount();
60	>	pf.run();
61	>	pf.runAndReset();
62	>	assertEquals(savedRunCount, pf.runCount());
63	>	Object r2 = null;
64	>	try {
65	>	r2 = f.get();
66	>	} catch (CancellationException t) {
67	>	assertSame(exInfo, CancellationException.class);
68	>	} catch (ExecutionException t) {
69	>	assertSame(exInfo, t.getCause());
70	>	} catch (Throwable t) {
71	>	threadUnexpectedException(t);
72	>	}
73	>	if (exInfo == null)
74	>	assertSame(r, r2);
75	>	assertTrue(f.isDone());
76	>	}
77	>	}
78	>
79	>	void checkNotDone(Future<?> f) {
80	>	assertFalse(f.isDone());
81	>	assertFalse(f.isCancelled());
82	>	if (f instanceof PublicFutureTask) {
83	>	PublicFutureTask pf = (PublicFutureTask) f;
84	>	assertEquals(0, pf.doneCount());
85	>	assertEquals(0, pf.setCount());
86	>	assertEquals(0, pf.setExceptionCount());
87	>	}
88	>	}
89	>
90	>	void checkIsRunning(Future<?> f) {
91	>	checkNotDone(f);
92	>	if (f instanceof FutureTask) {
93	>	FutureTask<?> ft = (FutureTask<?>) f;
94	>	// Check that run methods do nothing
95	>	ft.run();
96	>	if (f instanceof PublicFutureTask) {
97	>	PublicFutureTask pf = (PublicFutureTask) f;
98	>	int savedRunCount = pf.runCount();
99	>	pf.run();
100	>	assertFalse(pf.runAndReset());
101	>	assertEquals(savedRunCount, pf.runCount());
102	>	}
103	>	checkNotDone(f);
104	>	}
105	>	}
106	>
107	>	<T> void checkCompletedNormally(Future<T> f, T expectedValue) {
108	>	checkIsDone(f);
109	>	assertFalse(f.isCancelled());
110	>
111	>	T v1 = null, v2 = null;
112	>	try {
113	>	v1 = f.get();
114	>	v2 = f.get(randomTimeout(), randomTimeUnit());
115	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
116	>	assertSame(expectedValue, v1);
117	>	assertSame(expectedValue, v2);
118	>	}
119	>
120	>	void checkCancelled(Future<?> f) {
121	>	checkIsDone(f);
122	>	assertTrue(f.isCancelled());
123	>
124	>	try {
125	>	f.get();
126	>	shouldThrow();
127	>	} catch (CancellationException success) {
128	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
129	>
130	>	try {
131	>	f.get(randomTimeout(), randomTimeUnit());
132	>	shouldThrow();
133	>	} catch (CancellationException success) {
134	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
135	>	}
136	>
137	>	void tryToConfuseDoneTask(PublicFutureTask pf) {
138	>	pf.set(new Object());
139	>	pf.setException(new Error());
140	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
141	>	pf.cancel(mayInterruptIfRunning);
142	>	}
143	>	}
144	>
145	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
146	>	checkIsDone(f);
147	>	assertFalse(f.isCancelled());
148	>
149	>	try {
150	>	f.get();
151	>	shouldThrow();
152	>	} catch (ExecutionException success) {
153	>	assertSame(t, success.getCause());
154	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
155	>
156	>	try {
157	>	f.get(randomTimeout(), randomTimeUnit());
158	>	shouldThrow();
159	>	} catch (ExecutionException success) {
160	>	assertSame(t, success.getCause());
161	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
162		}
163
164		/**
165		* Subclass to expose protected methods
166		*/
167	<	static class MyFutureTask extends FutureTask {
168	<	public MyFutureTask(Callable r) { super(r); }
169	<	public boolean reset() { return super.reset(); }
170	<	public void setCancelled() { super.setCancelled(); }
171	<	public void setDone() { super.setDone(); }
172	<	public void set(Object x) { super.set(x); }
173	<	public void setException(Throwable t) { super.setException(t); }
167	>	static class PublicFutureTask extends FutureTask<Object> {
168	>	private final AtomicInteger runCount;
169	>	private final AtomicInteger doneCount = new AtomicInteger(0);
170	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
171	>	private final AtomicInteger setCount = new AtomicInteger(0);
172	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
173	>	public int runCount() { return runCount.get(); }
174	>	public int doneCount() { return doneCount.get(); }
175	>	public int runAndResetCount() { return runAndResetCount.get(); }
176	>	public int setCount() { return setCount.get(); }
177	>	public int setExceptionCount() { return setExceptionCount.get(); }
178	>
179	>	PublicFutureTask(Runnable runnable) {
180	>	this(runnable, seven);
181	>	}
182	>	PublicFutureTask(Runnable runnable, Object result) {
183	>	this(runnable, result, new AtomicInteger(0));
184	>	}
185	>	private PublicFutureTask(final Runnable runnable, Object result,
186	>	final AtomicInteger runCount) {
187	>	super(new Runnable() {
188	>	public void run() {
189	>	runCount.getAndIncrement();
190	>	runnable.run();
191	>	}}, result);
192	>	this.runCount = runCount;
193	>	}
194	>	PublicFutureTask(Callable<?> callable) {
195	>	this(callable, new AtomicInteger(0));
196	>	}
197	>	private PublicFutureTask(final Callable<?> callable,
198	>	final AtomicInteger runCount) {
199	>	super(new Callable<Object>() {
200	>	public Object call() throws Exception {
201	>	runCount.getAndIncrement();
202	>	return callable.call();
203	>	}});
204	>	this.runCount = runCount;
205	>	}
206	>	@Override public void done() {
207	>	assertTrue(isDone());
208	>	doneCount.incrementAndGet();
209	>	super.done();
210	>	}
211	>	@Override public boolean runAndReset() {
212	>	runAndResetCount.incrementAndGet();
213	>	return super.runAndReset();
214	>	}
215	>	@Override public void set(Object x) {
216	>	setCount.incrementAndGet();
217	>	super.set(x);
218	>	}
219	>	@Override public void setException(Throwable t) {
220	>	setExceptionCount.incrementAndGet();
221	>	super.setException(t);
222	>	}
223	>	}
224	>
225	>	class Counter extends CheckedRunnable {
226	>	final AtomicInteger count = new AtomicInteger(0);
227	>	public int get() { return count.get(); }
228	>	public void realRun() {
229	>	count.getAndIncrement();
230	>	}
231		}
232
233		/**
234	<	* Creating a future with a null callable throws NPE
234	>	* creating a future with a null callable throws NullPointerException
235		*/
236		public void testConstructor() {
237		try {
238	<	FutureTask task = new FutureTask(null);
238	>	new FutureTask<Void>(null);
239		shouldThrow();
240	<	}
41	<	catch(NullPointerException success) {
42	<	}
240	>	} catch (NullPointerException success) {}
241		}
242
243		/**
244	<	* creating a future with null runnable fails
244	>	* creating a future with null runnable throws NullPointerException
245		*/
246		public void testConstructor2() {
247		try {
248	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
248	>	new FutureTask<Boolean>(null, Boolean.TRUE);
249		shouldThrow();
250	<	}
53	<	catch(NullPointerException success) {
54	<	}
250	>	} catch (NullPointerException success) {}
251		}
252
253		/**
254		* isDone is true when a task completes
255		*/
256		public void testIsDone() {
257	<	FutureTask task = new FutureTask( new NoOpCallable());
62	<	task.run();
63	<	assertTrue(task.isDone());
64	<	assertFalse(task.isCancelled());
65	<	}
66	<
67	<	/**
68	<	* reset of a done task succeeds and changes status to not done
69	<	*/
70	<	public void testReset() {
71	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
72	<	task.run();
73	<	assertTrue(task.isDone());
74	<	assertTrue(task.reset());
257	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
258		assertFalse(task.isDone());
259	+	task.run();
260	+	assertTrue(task.isDone());
261	+	checkCompletedNormally(task, Boolean.TRUE);
262	+	assertEquals(1, task.runCount());
263		}
264
265		/**
266	<	* Resetting after cancellation fails
80	<	*/
81	<	public void testResetAfterCancel() {
82	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
83	<	assertTrue(task.cancel(false));
84	<	task.run();
85	<	assertTrue(task.isDone());
86	<	assertTrue(task.isCancelled());
87	<	assertFalse(task.reset());
88	<	}
89	<
90	<	/**
91	<	* setDone of new task causes isDone to be true
266	>	* runAndReset of a non-cancelled task succeeds
267		*/
268	<	public void testSetDone() {
269	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
270	<	task.setDone();
271	<	assertTrue(task.isDone());
272	<	assertFalse(task.isCancelled());
268	>	public void testRunAndReset() {
269	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
270	>	for (int i = 0; i < 3; i++) {
271	>	assertTrue(task.runAndReset());
272	>	checkNotDone(task);
273	>	assertEquals(i + 1, task.runCount());
274	>	assertEquals(i + 1, task.runAndResetCount());
275	>	assertEquals(0, task.setCount());
276	>	assertEquals(0, task.setExceptionCount());
277	>	}
278		}
279
280		/**
281	<	* setCancelled of a new task causes isCancelled to be true
281	>	* runAndReset after cancellation fails
282		*/
283	<	public void testSetCancelled() {
284	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
285	<	assertTrue(task.cancel(false));
286	<	task.setCancelled();
287	<	assertTrue(task.isDone());
288	<	assertTrue(task.isCancelled());
283	>	public void testRunAndResetAfterCancel() {
284	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
285	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
286	>	assertTrue(task.cancel(mayInterruptIfRunning));
287	>	for (int i = 0; i < 3; i++) {
288	>	assertFalse(task.runAndReset());
289	>	assertEquals(0, task.runCount());
290	>	assertEquals(i + 1, task.runAndResetCount());
291	>	assertEquals(0, task.setCount());
292	>	assertEquals(0, task.setExceptionCount());
293	>	}
294	>	tryToConfuseDoneTask(task);
295	>	checkCancelled(task);
296	>	}
297		}
298
299		/**
300	<	* setting value gauses get to return it
300	>	* setting value causes get to return it
301		*/
302	<	public void testSet() {
303	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
302	>	public void testSet() throws Exception {
303	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
304		task.set(one);
305	<	try {
306	<	assertEquals(task.get(), one);
307	<	}
308	<	catch(Exception e) {
309	<	unexpectedException();
310	<	}
305	>	for (int i = 0; i < 3; i++) {
306	>	assertSame(one, task.get());
307	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
308	>	assertEquals(1, task.setCount());
309	>	}
310	>	tryToConfuseDoneTask(task);
311	>	checkCompletedNormally(task, one);
312	>	assertEquals(0, task.runCount());
313		}
314
315		/**
316		* setException causes get to throw ExecutionException
317		*/
318	<	public void testSetException() {
318	>	public void testSetException_get() throws Exception {
319		Exception nse = new NoSuchElementException();
320	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
320	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
321		task.setException(nse);
322	+
323		try {
324	<	Object x = task.get();
324	>	task.get();
325		shouldThrow();
326	+	} catch (ExecutionException success) {
327	+	assertSame(nse, success.getCause());
328	+	checkCompletedAbnormally(task, nse);
329		}
330	<	catch(ExecutionException ee) {
331	<	Throwable cause = ee.getCause();
332	<	assertEquals(cause, nse);
333	<	}
334	<	catch(Exception e) {
335	<	unexpectedException();
330	>
331	>	try {
332	>	task.get(LONG_DELAY_MS, MILLISECONDS);
333	>	shouldThrow();
334	>	} catch (ExecutionException success) {
335	>	assertSame(nse, success.getCause());
336	>	checkCompletedAbnormally(task, nse);
337		}
338	+
339	+	assertEquals(1, task.setExceptionCount());
340	+	assertEquals(0, task.setCount());
341	+	tryToConfuseDoneTask(task);
342	+	checkCompletedAbnormally(task, nse);
343	+	assertEquals(0, task.runCount());
344		}
345
346		/**
347	<	*  Cancelling before running succeeds
347	>	* cancel(false) before run succeeds
348		*/
349		public void testCancelBeforeRun() {
350	<	FutureTask task = new FutureTask( new NoOpCallable());
350	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
351		assertTrue(task.cancel(false));
352	<	task.run();
353	<	assertTrue(task.isDone());
354	<	assertTrue(task.isCancelled());
352	>	task.run();
353	>	assertEquals(0, task.runCount());
354	>	assertEquals(0, task.setCount());
355	>	assertEquals(0, task.setExceptionCount());
356	>	assertTrue(task.isCancelled());
357	>	assertTrue(task.isDone());
358	>	tryToConfuseDoneTask(task);
359	>	assertEquals(0, task.runCount());
360	>	checkCancelled(task);
361		}
362
363		/**
364	<	* Cancel(true) before run succeeds
364	>	* cancel(true) before run succeeds
365		*/
366		public void testCancelBeforeRun2() {
367	<	FutureTask task = new FutureTask( new NoOpCallable());
367	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
368		assertTrue(task.cancel(true));
369	<	task.run();
370	<	assertTrue(task.isDone());
371	<	assertTrue(task.isCancelled());
369	>	task.run();
370	>	assertEquals(0, task.runCount());
371	>	assertEquals(0, task.setCount());
372	>	assertEquals(0, task.setExceptionCount());
373	>	assertTrue(task.isCancelled());
374	>	assertTrue(task.isDone());
375	>	tryToConfuseDoneTask(task);
376	>	assertEquals(0, task.runCount());
377	>	checkCancelled(task);
378		}
379
380		/**
381	<	* cancel of a completed task fails
381	>	* cancel(false) of a completed task fails
382		*/
383		public void testCancelAfterRun() {
384	<	FutureTask task = new FutureTask( new NoOpCallable());
385	<	task.run();
384	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
385	>	task.run();
386		assertFalse(task.cancel(false));
387	<	assertTrue(task.isDone());
388	<	assertFalse(task.isCancelled());
387	>	assertEquals(1, task.runCount());
388	>	assertEquals(1, task.setCount());
389	>	assertEquals(0, task.setExceptionCount());
390	>	tryToConfuseDoneTask(task);
391	>	checkCompletedNormally(task, Boolean.TRUE);
392	>	assertEquals(1, task.runCount());
393		}
394
395		/**
396	<	* cancel(true) interrupts a running task
396	>	* cancel(true) of a completed task fails
397	>	*/
398	>	public void testCancelAfterRun2() {
399	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
400	>	task.run();
401	>	assertFalse(task.cancel(true));
402	>	assertEquals(1, task.runCount());
403	>	assertEquals(1, task.setCount());
404	>	assertEquals(0, task.setExceptionCount());
405	>	tryToConfuseDoneTask(task);
406	>	checkCompletedNormally(task, Boolean.TRUE);
407	>	assertEquals(1, task.runCount());
408	>	}
409	>
410	>	/**
411	>	* cancel(true) interrupts a running task that subsequently succeeds
412		*/
413		public void testCancelInterrupt() {
414	<	FutureTask task = new FutureTask( new Callable() {
415	<	public Object call() {
414	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
415	>	final PublicFutureTask task =
416	>	new PublicFutureTask(new CheckedRunnable() {
417	>	public void realRun() {
418	>	pleaseCancel.countDown();
419		try {
420	<	Thread.sleep(MEDIUM_DELAY_MS);
421	<	threadShouldThrow();
422	<	}
423	<	catch (InterruptedException success) {}
424	<	return Boolean.TRUE;
425	<	} });
426	<	Thread t = new  Thread(task);
420	>	delay(LONG_DELAY_MS);
421	>	shouldThrow();
422	>	} catch (InterruptedException success) {}
423	>	assertFalse(Thread.interrupted());
424	>	}});
425	>
426	>	Thread t = newStartedThread(task);
427	>	await(pleaseCancel);
428	>	assertTrue(task.cancel(true));
429	>	assertTrue(task.isCancelled());
430	>	assertTrue(task.isDone());
431	>	awaitTermination(t);
432	>	assertEquals(1, task.runCount());
433	>	assertEquals(1, task.setCount());
434	>	assertEquals(0, task.setExceptionCount());
435	>	tryToConfuseDoneTask(task);
436	>	checkCancelled(task);
437	>	}
438	>
439	>	/**
440	>	* cancel(true) tries to interrupt a running task, but
441	>	* Thread.interrupt throws (simulating a restrictive security
442	>	* manager)
443	>	*/
444	>	public void testCancelInterrupt_ThrowsSecurityException() {
445	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
446	>	final CountDownLatch cancelled = new CountDownLatch(1);
447	>	final PublicFutureTask task =
448	>	new PublicFutureTask(new CheckedRunnable() {
449	>	public void realRun() {
450	>	pleaseCancel.countDown();
451	>	await(cancelled);
452	>	assertFalse(Thread.interrupted());
453	>	}});
454	>
455	>	final Thread t = new Thread(task) {
456	>	// Simulate a restrictive security manager.
457	>	@Override public void interrupt() {
458	>	throw new SecurityException();
459	>	}};
460	>	t.setDaemon(true);
461		t.start();
462	<
462	>
463	>	await(pleaseCancel);
464		try {
465	<	Thread.sleep(SHORT_DELAY_MS);
466	<	assertTrue(task.cancel(true));
467	<	t.join();
468	<	assertTrue(task.isDone());
469	<	assertTrue(task.isCancelled());
470	<	} catch(InterruptedException e){
471	<	unexpectedException();
472	<	}
465	>	task.cancel(true);
466	>	shouldThrow();
467	>	} catch (SecurityException success) {}
468	>
469	>	// We failed to deliver the interrupt, but the world retains
470	>	// its sanity, as if we had done task.cancel(false)
471	>	assertTrue(task.isCancelled());
472	>	assertTrue(task.isDone());
473	>	assertEquals(1, task.runCount());
474	>	assertEquals(1, task.doneCount());
475	>	assertEquals(0, task.setCount());
476	>	assertEquals(0, task.setExceptionCount());
477	>	cancelled.countDown();
478	>	awaitTermination(t);
479	>	assertEquals(1, task.setCount());
480	>	assertEquals(0, task.setExceptionCount());
481	>	tryToConfuseDoneTask(task);
482	>	checkCancelled(task);
483		}
484
485	+	/**
486	+	* cancel(true) interrupts a running task that subsequently throws
487	+	*/
488	+	public void testCancelInterrupt_taskFails() {
489	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
490	+	final PublicFutureTask task =
491	+	new PublicFutureTask(new Runnable() {
492	+	public void run() {
493	+	pleaseCancel.countDown();
494	+	try {
495	+	delay(LONG_DELAY_MS);
496	+	threadShouldThrow();
497	+	} catch (InterruptedException success) {
498	+	} catch (Throwable t) { threadUnexpectedException(t); }
499	+	throw new RuntimeException();
500	+	}});
501	+
502	+	Thread t = newStartedThread(task);
503	+	await(pleaseCancel);
504	+	assertTrue(task.cancel(true));
505	+	assertTrue(task.isCancelled());
506	+	awaitTermination(t);
507	+	assertEquals(1, task.runCount());
508	+	assertEquals(0, task.setCount());
509	+	assertEquals(1, task.setExceptionCount());
510	+	tryToConfuseDoneTask(task);
511	+	checkCancelled(task);
512	+	}
513
514		/**
515		* cancel(false) does not interrupt a running task
516		*/
517		public void testCancelNoInterrupt() {
518	<	FutureTask task = new FutureTask( new Callable() {
519	<	public Object call() {
520	<	try {
521	<	Thread.sleep(MEDIUM_DELAY_MS);
522	<	}
523	<	catch (InterruptedException success) {
524	<	threadFail("should not interrupt");
525	<	}
518	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
519	>	final CountDownLatch cancelled = new CountDownLatch(1);
520	>	final PublicFutureTask task =
521	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
522	>	public Boolean realCall() {
523	>	pleaseCancel.countDown();
524	>	await(cancelled);
525	>	assertFalse(Thread.interrupted());
526		return Boolean.TRUE;
527	<	} });
528	<	Thread t = new  Thread(task);
529	<	t.start();
530	<
531	<	try {
532	<	Thread.sleep(SHORT_DELAY_MS);
533	<	assertTrue(task.cancel(false));
534	<	t.join();
535	<	assertTrue(task.isDone());
536	<	assertTrue(task.isCancelled());
537	<	} catch(InterruptedException e){
538	<	unexpectedException();
539	<	}
527	>	}});
528	>
529	>	Thread t = newStartedThread(task);
530	>	await(pleaseCancel);
531	>	assertTrue(task.cancel(false));
532	>	assertTrue(task.isCancelled());
533	>	cancelled.countDown();
534	>	awaitTermination(t);
535	>	assertEquals(1, task.runCount());
536	>	assertEquals(1, task.setCount());
537	>	assertEquals(0, task.setExceptionCount());
538	>	tryToConfuseDoneTask(task);
539	>	checkCancelled(task);
540	>	}
541	>
542	>	/**
543	>	* run in one thread causes get in another thread to retrieve value
544	>	*/
545	>	public void testGetRun() {
546	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
547	>
548	>	final PublicFutureTask task =
549	>	new PublicFutureTask(new CheckedCallable<Object>() {
550	>	public Object realCall() {
551	>	return two;
552	>	}});
553	>
554	>	Thread t1 = newStartedThread(new CheckedRunnable() {
555	>	public void realRun() throws Exception {
556	>	pleaseRun.countDown();
557	>	assertSame(two, task.get());
558	>	}});
559	>
560	>	Thread t2 = newStartedThread(new CheckedRunnable() {
561	>	public void realRun() throws Exception {
562	>	pleaseRun.countDown();
563	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
564	>	}});
565	>
566	>	await(pleaseRun);
567	>	checkNotDone(task);
568	>	assertTrue(t1.isAlive());
569	>	assertTrue(t2.isAlive());
570	>	task.run();
571	>	checkCompletedNormally(task, two);
572	>	assertEquals(1, task.runCount());
573	>	assertEquals(1, task.setCount());
574	>	assertEquals(0, task.setExceptionCount());
575	>	awaitTermination(t1);
576	>	awaitTermination(t2);
577	>	tryToConfuseDoneTask(task);
578	>	checkCompletedNormally(task, two);
579		}
580
581		/**
582		* set in one thread causes get in another thread to retrieve value
583		*/
584	<	public void testGet1() {
585	<	final FutureTask ft = new FutureTask(new Callable() {
586	<	public Object call() {
587	<	try {
588	<	Thread.sleep(MEDIUM_DELAY_MS);
589	<	} catch(InterruptedException e){
590	<	threadUnexpectedException();
591	<	}
592	<	return Boolean.TRUE;
593	<	}
594	<	});
595	<	Thread t = new Thread(new Runnable() {
596	<	public void run() {
597	<	try {
598	<	ft.get();
599	<	} catch(Exception e){
600	<	threadUnexpectedException();
601	<	}
602	<	}
603	<	});
604	<	try {
605	<	assertFalse(ft.isDone());
606	<	assertFalse(ft.isCancelled());
607	<	t.start();
608	<	Thread.sleep(SHORT_DELAY_MS);
609	<	ft.run();
610	<	t.join();
611	<	assertTrue(ft.isDone());
612	<	assertFalse(ft.isCancelled());
613	<	} catch(InterruptedException e){
614	<	unexpectedException();
615	<
616	<	}
584	>	public void testGetSet() {
585	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
586	>
587	>	final PublicFutureTask task =
588	>	new PublicFutureTask(new CheckedCallable<Object>() {
589	>	public Object realCall() throws InterruptedException {
590	>	return two;
591	>	}});
592	>
593	>	Thread t1 = newStartedThread(new CheckedRunnable() {
594	>	public void realRun() throws Exception {
595	>	pleaseSet.countDown();
596	>	assertSame(two, task.get());
597	>	}});
598	>
599	>	Thread t2 = newStartedThread(new CheckedRunnable() {
600	>	public void realRun() throws Exception {
601	>	pleaseSet.countDown();
602	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
603	>	}});
604	>
605	>	await(pleaseSet);
606	>	checkNotDone(task);
607	>	assertTrue(t1.isAlive());
608	>	assertTrue(t2.isAlive());
609	>	task.set(two);
610	>	assertEquals(0, task.runCount());
611	>	assertEquals(1, task.setCount());
612	>	assertEquals(0, task.setExceptionCount());
613	>	tryToConfuseDoneTask(task);
614	>	checkCompletedNormally(task, two);
615	>	awaitTermination(t1);
616	>	awaitTermination(t2);
617		}
618
619		/**
620	<	* set in one thread causes timed get in another thread to retrieve value
621	<	*/
622	<	public void testTimedGet1() {
623	<	final FutureTask ft = new FutureTask(new Callable() {
624	<	public Object call() {
625	<	try {
626	<	Thread.sleep(MEDIUM_DELAY_MS);
627	<	} catch(InterruptedException e){
628	<	threadUnexpectedException();
629	<	}
630	<	return Boolean.TRUE;
631	<	}
632	<	});
633	<	Thread t = new Thread(new Runnable() {
634	<	public void run() {
635	<	try {
636	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
637	<	} catch(TimeoutException success) {
638	<	} catch(Exception e){
639	<	threadUnexpectedException();
640	<	}
641	<	}
642	<	});
643	<	try {
644	<	assertFalse(ft.isDone());
645	<	assertFalse(ft.isCancelled());
646	<	t.start();
647	<	ft.run();
648	<	t.join();
649	<	assertTrue(ft.isDone());
650	<	assertFalse(ft.isCancelled());
651	<	} catch(InterruptedException e){
652	<	unexpectedException();
653	<
654	<	}
620	>	* Cancelling a task causes timed get in another thread to throw
621	>	* CancellationException
622	>	*/
623	>	public void testTimedGet_Cancellation() {
624	>	testTimedGet_Cancellation(false);
625	>	}
626	>	public void testTimedGet_Cancellation_interrupt() {
627	>	testTimedGet_Cancellation(true);
628	>	}
629	>	public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) {
630	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
631	>	final CountDownLatch cancelled = new CountDownLatch(1);
632	>	final Callable<Object> callable =
633	>	new CheckedCallable<Object>() {
634	>	public Object realCall() throws InterruptedException {
635	>	pleaseCancel.countDown();
636	>	if (mayInterruptIfRunning) {
637	>	try {
638	>	delay(2*LONG_DELAY_MS);
639	>	} catch (InterruptedException success) {}
640	>	} else {
641	>	await(cancelled);
642	>	}
643	>	return two;
644	>	}};
645	>	final PublicFutureTask task = new PublicFutureTask(callable);
646	>
647	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
648	>	public void realRun() throws Exception {
649	>	pleaseCancel.countDown();
650	>	task.get();
651	>	}};
652	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
653	>	public void realRun() throws Exception {
654	>	pleaseCancel.countDown();
655	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
656	>	}};
657	>	t1.start();
658	>	t2.start();
659	>	Thread t3 = newStartedThread(task);
660	>	await(pleaseCancel);
661	>	checkIsRunning(task);
662	>	task.cancel(mayInterruptIfRunning);
663	>	checkCancelled(task);
664	>	awaitTermination(t1);
665	>	awaitTermination(t2);
666	>	cancelled.countDown();
667	>	awaitTermination(t3);
668	>	assertEquals(1, task.runCount());
669	>	assertEquals(1, task.setCount());
670	>	assertEquals(0, task.setExceptionCount());
671	>	tryToConfuseDoneTask(task);
672	>	checkCancelled(task);
673		}
674
675		/**
676	<	*  Cancelling a task causes timed get in another thread to throw CancellationException
676	>	* A runtime exception in task causes get to throw ExecutionException
677		*/
678	<	public void testTimedGet_Cancellation() {
679	<	final FutureTask ft = new FutureTask(new Callable() {
680	<	public Object call() {
681	<	try {
682	<	Thread.sleep(SMALL_DELAY_MS);
683	<	threadShouldThrow();
684	<	} catch(InterruptedException e) {
685	<	}
686	<	return Boolean.TRUE;
687	<	}
688	<	});
689	<	try {
690	<	Thread t1 = new Thread(new Runnable() {
691	<	public void run() {
692	<	try {
693	<	ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
694	<	threadShouldThrow();
695	<	} catch(CancellationException success) {}
331	<	catch(Exception e){
332	<	threadUnexpectedException();
333	<	}
334	<	}
335	<	});
336	<	Thread t2 = new Thread(ft);
337	<	t1.start();
338	<	t2.start();
339	<	Thread.sleep(SHORT_DELAY_MS);
340	<	ft.cancel(true);
341	<	t1.join();
342	<	t2.join();
343	<	} catch(InterruptedException ie){
344	<	unexpectedException();
678	>	public void testGet_ExecutionException() throws InterruptedException {
679	>	final ArithmeticException e = new ArithmeticException();
680	>	final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() {
681	>	public Object call() {
682	>	throw e;
683	>	}});
684	>
685	>	task.run();
686	>	assertEquals(1, task.runCount());
687	>	assertEquals(0, task.setCount());
688	>	assertEquals(1, task.setExceptionCount());
689	>	try {
690	>	task.get();
691	>	shouldThrow();
692	>	} catch (ExecutionException success) {
693	>	assertSame(e, success.getCause());
694	>	tryToConfuseDoneTask(task);
695	>	checkCompletedAbnormally(task, success.getCause());
696		}
697		}
698
699		/**
700	<	* Cancelling a task causes get in another thread to throw CancellationException
701	<	*/
702	<	public void testGet_Cancellation() {
703	<	final FutureTask ft = new FutureTask(new Callable() {
704	<	public Object call() {
705	<	try {
706	<	Thread.sleep(MEDIUM_DELAY_MS);
707	<	threadShouldThrow();
708	<	} catch(InterruptedException e){
709	<	}
710	<	return Boolean.TRUE;
711	<	}
712	<	});
713	<	try {
714	<	Thread t1 = new Thread(new Runnable() {
715	<	public void run() {
716	<	try {
717	<	ft.get();
718	<	threadShouldThrow();
719	<	} catch(CancellationException success){
720	<	}
721	<	catch(Exception e){
722	<	threadUnexpectedException();
723	<	}
724	<	}
725	<	});
726	<	Thread t2 = new Thread(ft);
727	<	t1.start();
728	<	t2.start();
729	<	Thread.sleep(SHORT_DELAY_MS);
730	<	ft.cancel(true);
731	<	t1.join();
732	<	t2.join();
733	<	} catch(InterruptedException success){
734	<	unexpectedException();
700	>	* A runtime exception in task causes timed get to throw ExecutionException
701	>	*/
702	>	public void testTimedGet_ExecutionException2() throws Exception {
703	>	final ArithmeticException e = new ArithmeticException();
704	>	final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() {
705	>	public Object call() {
706	>	throw e;
707	>	}});
708	>
709	>	task.run();
710	>	try {
711	>	task.get(LONG_DELAY_MS, MILLISECONDS);
712	>	shouldThrow();
713	>	} catch (ExecutionException success) {
714	>	assertSame(e, success.getCause());
715	>	tryToConfuseDoneTask(task);
716	>	checkCompletedAbnormally(task, success.getCause());
717	>	}
718	>	}
719	>
720	>	/**
721	>	* get is interruptible
722	>	*/
723	>	public void testGet_Interruptible() {
724	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
725	>	final FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
726	>	Thread t = newStartedThread(new CheckedRunnable() {
727	>	public void realRun() throws Exception {
728	>	Thread.currentThread().interrupt();
729	>	try {
730	>	task.get();
731	>	shouldThrow();
732	>	} catch (InterruptedException success) {}
733	>	assertFalse(Thread.interrupted());
734	>
735	>	pleaseInterrupt.countDown();
736	>	try {
737	>	task.get();
738	>	shouldThrow();
739	>	} catch (InterruptedException success) {}
740	>	assertFalse(Thread.interrupted());
741	>	}});
742	>
743	>	await(pleaseInterrupt);
744	>	t.interrupt();
745	>	awaitTermination(t);
746	>	checkNotDone(task);
747	>	}
748	>
749	>	/**
750	>	* timed get is interruptible
751	>	*/
752	>	public void testTimedGet_Interruptible() {
753	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
754	>	final FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
755	>	Thread t = newStartedThread(new CheckedRunnable() {
756	>	public void realRun() throws Exception {
757	>	Thread.currentThread().interrupt();
758	>	try {
759	>	task.get(randomTimeout(), randomTimeUnit());
760	>	shouldThrow();
761	>	} catch (InterruptedException success) {}
762	>	assertFalse(Thread.interrupted());
763	>
764	>	pleaseInterrupt.countDown();
765	>	try {
766	>	task.get(LONGER_DELAY_MS, MILLISECONDS);
767	>	shouldThrow();
768	>	} catch (InterruptedException success) {}
769	>	assertFalse(Thread.interrupted());
770	>	}});
771	>
772	>	await(pleaseInterrupt);
773	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
774	>	t.interrupt();
775	>	awaitTermination(t);
776	>	checkNotDone(task);
777	>	}
778	>
779	>	/**
780	>	* A timed out timed get throws TimeoutException
781	>	*/
782	>	public void testGet_TimeoutException() throws Exception {
783	>	FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
784	>	long startTime = System.nanoTime();
785	>	try {
786	>	task.get(timeoutMillis(), MILLISECONDS);
787	>	shouldThrow();
788	>	} catch (TimeoutException success) {
789	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
790		}
791		}
386	–
792
793		/**
794	<	* A runtime exception in task causes get to throw ExecutionException
794	>	* timed get with null TimeUnit throws NullPointerException
795		*/
796	<	public void testGet_ExecutionException() {
797	<	final FutureTask ft = new FutureTask(new Callable() {
798	<	public Object call() {
799	<	int i = 5/0;
800	<	return Boolean.TRUE;
801	<	}
802	<	});
803	<	try {
804	<	ft.run();
805	<	ft.get();
806	<	shouldThrow();
807	<	} catch(ExecutionException success){
808	<	}
809	<	catch(Exception e){
810	<	unexpectedException();
811	<	}
812	<	}
813	<
409	<	/**
410	<	*  A runtime exception in task causes timed get to throw ExecutionException
411	<	*/
412	<	public void testTimedGet_ExecutionException2() {
413	<	final FutureTask ft = new FutureTask(new Callable() {
414	<	public Object call() {
415	<	int i = 5/0;
416	<	return Boolean.TRUE;
417	<	}
418	<	});
419	<	try {
420	<	ft.run();
421	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
422	<	shouldThrow();
423	<	} catch(ExecutionException success) {
424	<	} catch(TimeoutException success) { } // unlikely but OK
425	<	catch(Exception e){
426	<	unexpectedException();
427	<	}
428	<	}
429	<
430	<
431	<	/**
432	<	* Interrupting a waiting get causes it to throw InterruptedException
433	<	*/
434	<	public void testGet_InterruptedException() {
435	<	final FutureTask ft = new FutureTask(new NoOpCallable());
436	<	Thread t = new Thread(new Runnable() {
437	<	public void run() {
438	<	try {
439	<	ft.get();
440	<	threadShouldThrow();
441	<	} catch(InterruptedException success){
442	<	} catch(Exception e){
443	<	threadUnexpectedException();
444	<	}
445	<	}
446	<	});
447	<	try {
448	<	t.start();
449	<	Thread.sleep(SHORT_DELAY_MS);
450	<	t.interrupt();
451	<	t.join();
452	<	} catch(Exception e){
453	<	unexpectedException();
454	<	}
455	<	}
456	<
457	<	/**
458	<	*  Interrupting a waiting timed get causes it to throw InterruptedException
459	<	*/
460	<	public void testTimedGet_InterruptedException2() {
461	<	final FutureTask ft = new FutureTask(new NoOpCallable());
462	<	Thread t = new Thread(new Runnable() {
463	<	public void run() {
464	<	try {
465	<	ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
466	<	threadShouldThrow();
467	<	} catch(InterruptedException success){}
468	<	catch(Exception e){
469	<	threadUnexpectedException();
470	<	}
471	<	}
472	<	});
473	<	try {
474	<	t.start();
475	<	Thread.sleep(SHORT_DELAY_MS);
476	<	t.interrupt();
477	<	t.join();
478	<	} catch(Exception e){
479	<	unexpectedException();
796	>	public void testGet_NullTimeUnit() throws Exception {
797	>	FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
798	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
799	>
800	>	for (long timeout : timeouts) {
801	>	try {
802	>	task.get(timeout, null);
803	>	shouldThrow();
804	>	} catch (NullPointerException success) {}
805	>	}
806	>
807	>	task.run();
808	>
809	>	for (long timeout : timeouts) {
810	>	try {
811	>	task.get(timeout, null);
812	>	shouldThrow();
813	>	} catch (NullPointerException success) {}
814		}
815		}
816	<
816	>
817		/**
818	<	* A timed out timed get throws TimeoutException
818	>	* timed get with most negative timeout works correctly (i.e. no
819	>	* underflow bug)
820		*/
821	<	public void testGet_TimeoutException() {
822	<	try {
823	<	FutureTask ft = new FutureTask(new NoOpCallable());
824	<	ft.get(1,TimeUnit.MILLISECONDS);
825	<	shouldThrow();
826	<	} catch(TimeoutException success){}
827	<	catch(Exception success){
828	<	unexpectedException();
829	<	}
821	>	public void testGet_NegativeInfinityTimeout() throws Exception {
822	>	final ExecutorService pool = Executors.newFixedThreadPool(10);
823	>	final Runnable nop = new Runnable() { public void run() {}};
824	>	final FutureTask<Void> task = new FutureTask<>(nop, null);
825	>	final List<Future<?>> futures = new ArrayList<>();
826	>	Runnable r = new Runnable() { public void run() {
827	>	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
828	>	try {
829	>	task.get(timeout, NANOSECONDS);
830	>	shouldThrow();
831	>	} catch (TimeoutException success) {
832	>	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
833	>	for (int i = 0; i < 10; i++)
834	>	futures.add(pool.submit(r));
835	>	try {
836	>	joinPool(pool);
837	>	for (Future<?> future : futures)
838	>	checkCompletedNormally(future, null);
839	>	} finally {
840	>	task.run();         // last resort to help terminate
841	>	}
842		}
843	<
843	>
844	>	/**
845	>	* toString indicates current completion state
846	>	*/
847	>	public void testToString_incomplete() {
848	>	FutureTask<String> f = new FutureTask<>(() -> "");
849	>	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
850	>	if (testImplementationDetails)
851	>	assertTrue(f.toString().startsWith(
852	>	identityString(f) + "[Not completed, task ="));
853	>	}
854	>
855	>	public void testToString_normal() {
856	>	FutureTask<String> f = new FutureTask<>(() -> "");
857	>	f.run();
858	>	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
859	>	if (testImplementationDetails)
860	>	assertEquals(identityString(f) + "[Completed normally]",
861	>	f.toString());
862	>	}
863	>
864	>	public void testToString_exception() {
865	>	FutureTask<String> f = new FutureTask<>(
866	>	() -> { throw new ArithmeticException(); });
867	>	f.run();
868	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
869	>	if (testImplementationDetails)
870	>	assertTrue(f.toString().startsWith(
871	>	identityString(f) + "[Completed exceptionally: "));
872	>	}
873	>
874	>	public void testToString_cancelled() {
875	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
876	>	FutureTask<String> f = new FutureTask<>(() -> "");
877	>	assertTrue(f.cancel(mayInterruptIfRunning));
878	>	assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]"));
879	>	if (testImplementationDetails)
880	>	assertEquals(identityString(f) + "[Cancelled]",
881	>	f.toString());
882	>	}
883	>	}
884	>
885		}

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