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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.4 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.51 by jsr166, Sun Jan 7 22:59:18 2018 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	<	/**
39	<	* Subclass to expose protected methods
40	<	*/
41	<	static class MyFutureTask extends FutureTask {
42	<	public MyFutureTask(Callable r) { super(r); }
43	<	public boolean reset() { return super.reset(); }
44	<	public void setCancelled() { super.setCancelled(); }
45	<	public void setDone() { super.setDone(); }
46	<	public void set(Object x) { super.set(x); }
47	<	public void setException(Throwable t) { super.setException(t); }
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	>	try {
64	>	assertSame(r, f.get());
65	>	} catch (CancellationException t) {
66	>	assertSame(exInfo, CancellationException.class);
67	>	} catch (ExecutionException t) {
68	>	assertSame(exInfo, t.getCause());
69	>	} catch (Throwable t) {
70	>	threadUnexpectedException(t);
71	>	}
72	>	assertTrue(f.isDone());
73	>	}
74	>	}
75	>
76	>	void checkNotDone(Future<?> f) {
77	>	assertFalse(f.isDone());
78	>	assertFalse(f.isCancelled());
79	>	if (f instanceof PublicFutureTask) {
80	>	PublicFutureTask pf = (PublicFutureTask) f;
81	>	assertEquals(0, pf.doneCount());
82	>	assertEquals(0, pf.setCount());
83	>	assertEquals(0, pf.setExceptionCount());
84	>	}
85	>	}
86	>
87	>	void checkIsRunning(Future<?> f) {
88	>	checkNotDone(f);
89	>	if (f instanceof FutureTask) {
90	>	FutureTask ft = (FutureTask<?>) f;
91	>	// Check that run methods do nothing
92	>	ft.run();
93	>	if (f instanceof PublicFutureTask) {
94	>	PublicFutureTask pf = (PublicFutureTask) f;
95	>	int savedRunCount = pf.runCount();
96	>	pf.run();
97	>	assertFalse(pf.runAndReset());
98	>	assertEquals(savedRunCount, pf.runCount());
99	>	}
100	>	checkNotDone(f);
101	>	}
102	>	}
103	>
104	>	<T> void checkCompletedNormally(Future<T> f, T expected) {
105	>	checkIsDone(f);
106	>	assertFalse(f.isCancelled());
107	>
108	>	try {
109	>	assertSame(expected, f.get());
110	>	assertSame(expected, f.get(randomTimeout(), randomTimeUnit()));
111	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
112		}
113
114	<	public void testConstructor(){
114	>	void checkCancelled(Future<?> f) {
115	>	checkIsDone(f);
116	>	assertTrue(f.isCancelled());
117	>
118		try {
119	<	FutureTask task = new FutureTask(null);
120	<	fail("should throw");
121	<	}
122	<	catch(NullPointerException success) {
119	>	f.get();
120	>	shouldThrow();
121	>	} catch (CancellationException success) {
122	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
123	>
124	>	try {
125	>	f.get(randomTimeout(), randomTimeUnit());
126	>	shouldThrow();
127	>	} catch (CancellationException success) {
128	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
129	>	}
130	>
131	>	void tryToConfuseDoneTask(PublicFutureTask pf) {
132	>	pf.set(new Object());
133	>	pf.setException(new Error());
134	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
135	>	pf.cancel(mayInterruptIfRunning);
136		}
137		}
138
139	<	public void testConstructor2(){
139	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
140	>	checkIsDone(f);
141	>	assertFalse(f.isCancelled());
142	>
143		try {
144	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
145	<	fail("should throw");
144	>	f.get();
145	>	shouldThrow();
146	>	} catch (ExecutionException success) {
147	>	assertSame(t, success.getCause());
148	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
149	>
150	>	try {
151	>	f.get(randomTimeout(), randomTimeUnit());
152	>	shouldThrow();
153	>	} catch (ExecutionException success) {
154	>	assertSame(t, success.getCause());
155	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
156	>	}
157	>
158	>	/**
159	>	* Subclass to expose protected methods
160	>	*/
161	>	static class PublicFutureTask extends FutureTask {
162	>	private final AtomicInteger runCount;
163	>	private final AtomicInteger doneCount = new AtomicInteger(0);
164	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
165	>	private final AtomicInteger setCount = new AtomicInteger(0);
166	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
167	>	public int runCount() { return runCount.get(); }
168	>	public int doneCount() { return doneCount.get(); }
169	>	public int runAndResetCount() { return runAndResetCount.get(); }
170	>	public int setCount() { return setCount.get(); }
171	>	public int setExceptionCount() { return setExceptionCount.get(); }
172	>
173	>	PublicFutureTask(Runnable runnable) {
174	>	this(runnable, seven);
175	>	}
176	>	PublicFutureTask(Runnable runnable, Object result) {
177	>	this(runnable, result, new AtomicInteger(0));
178	>	}
179	>	private PublicFutureTask(final Runnable runnable, Object result,
180	>	final AtomicInteger runCount) {
181	>	super(new Runnable() {
182	>	public void run() {
183	>	runCount.getAndIncrement();
184	>	runnable.run();
185	>	}}, result);
186	>	this.runCount = runCount;
187	>	}
188	>	PublicFutureTask(Callable callable) {
189	>	this(callable, new AtomicInteger(0));
190	>	}
191	>	private PublicFutureTask(final Callable callable,
192	>	final AtomicInteger runCount) {
193	>	super(new Callable() {
194	>	public Object call() throws Exception {
195	>	runCount.getAndIncrement();
196	>	return callable.call();
197	>	}});
198	>	this.runCount = runCount;
199	>	}
200	>	@Override public void done() {
201	>	assertTrue(isDone());
202	>	doneCount.incrementAndGet();
203	>	super.done();
204	>	}
205	>	@Override public boolean runAndReset() {
206	>	runAndResetCount.incrementAndGet();
207	>	return super.runAndReset();
208	>	}
209	>	@Override public void set(Object x) {
210	>	setCount.incrementAndGet();
211	>	super.set(x);
212	>	}
213	>	@Override public void setException(Throwable t) {
214	>	setExceptionCount.incrementAndGet();
215	>	super.setException(t);
216		}
217	<	catch(NullPointerException success) {
217	>	}
218	>
219	>	class Counter extends CheckedRunnable {
220	>	final AtomicInteger count = new AtomicInteger(0);
221	>	public int get() { return count.get(); }
222	>	public void realRun() {
223	>	count.getAndIncrement();
224		}
225		}
226
227	<	public void testIsDone(){
228	<	FutureTask task = new FutureTask( new NoOpCallable());
229	<	task.run();
230	<	assertTrue(task.isDone());
231	<	assertFalse(task.isCancelled());
227	>	/**
228	>	* creating a future with a null callable throws NullPointerException
229	>	*/
230	>	public void testConstructor() {
231	>	try {
232	>	new FutureTask(null);
233	>	shouldThrow();
234	>	} catch (NullPointerException success) {}
235		}
236
237	<	public void testReset(){
238	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
239	<	task.run();
240	<	assertTrue(task.isDone());
241	<	assertTrue(task.reset());
237	>	/**
238	>	* creating a future with null runnable throws NullPointerException
239	>	*/
240	>	public void testConstructor2() {
241	>	try {
242	>	new FutureTask(null, Boolean.TRUE);
243	>	shouldThrow();
244	>	} catch (NullPointerException success) {}
245		}
246
247	<	public void testResetAfterCancel() {
248	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
249	<	assertTrue(task.cancel(false));
250	<	task.run();
251	<	assertTrue(task.isDone());
252	<	assertTrue(task.isCancelled());
253	<	assertFalse(task.reset());
247	>	/**
248	>	* isDone is true when a task completes
249	>	*/
250	>	public void testIsDone() {
251	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
252	>	assertFalse(task.isDone());
253	>	task.run();
254	>	assertTrue(task.isDone());
255	>	checkCompletedNormally(task, Boolean.TRUE);
256	>	assertEquals(1, task.runCount());
257		}
258
259	<	public void testSetDone() {
260	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
261	<	task.setDone();
262	<	assertTrue(task.isDone());
263	<	assertFalse(task.isCancelled());
259	>	/**
260	>	* runAndReset of a non-cancelled task succeeds
261	>	*/
262	>	public void testRunAndReset() {
263	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
264	>	for (int i = 0; i < 3; i++) {
265	>	assertTrue(task.runAndReset());
266	>	checkNotDone(task);
267	>	assertEquals(i + 1, task.runCount());
268	>	assertEquals(i + 1, task.runAndResetCount());
269	>	assertEquals(0, task.setCount());
270	>	assertEquals(0, task.setExceptionCount());
271	>	}
272		}
273
274	<	public void testSetCancelled() {
275	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
276	<	assertTrue(task.cancel(false));
277	<	task.setCancelled();
278	<	assertTrue(task.isDone());
279	<	assertTrue(task.isCancelled());
274	>	/**
275	>	* runAndReset after cancellation fails
276	>	*/
277	>	public void testRunAndResetAfterCancel() {
278	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
279	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
280	>	assertTrue(task.cancel(mayInterruptIfRunning));
281	>	for (int i = 0; i < 3; i++) {
282	>	assertFalse(task.runAndReset());
283	>	assertEquals(0, task.runCount());
284	>	assertEquals(i + 1, task.runAndResetCount());
285	>	assertEquals(0, task.setCount());
286	>	assertEquals(0, task.setExceptionCount());
287	>	}
288	>	tryToConfuseDoneTask(task);
289	>	checkCancelled(task);
290	>	}
291		}
292
293	<	public void testSet() {
294	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
293	>	/**
294	>	* setting value causes get to return it
295	>	*/
296	>	public void testSet() throws Exception {
297	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
298		task.set(one);
299	<	try {
300	<	assertEquals(task.get(), one);
301	<	}
302	<	catch(Exception e) {
303	<	fail("unexpected exception");
304	<	}
299	>	for (int i = 0; i < 3; i++) {
300	>	assertSame(one, task.get());
301	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
302	>	assertEquals(1, task.setCount());
303	>	}
304	>	tryToConfuseDoneTask(task);
305	>	checkCompletedNormally(task, one);
306	>	assertEquals(0, task.runCount());
307		}
308
309	<	public void testSetException() {
309	>	/**
310	>	* setException causes get to throw ExecutionException
311	>	*/
312	>	public void testSetException_get() throws Exception {
313		Exception nse = new NoSuchElementException();
314	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
314	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
315		task.setException(nse);
316	+
317		try {
318	<	Object x = task.get();
319	<	fail("should throw");
320	<	}
321	<	catch(ExecutionException ee) {
322	<	Throwable cause = ee.getCause();
110	<	assertEquals(cause, nse);
318	>	task.get();
319	>	shouldThrow();
320	>	} catch (ExecutionException success) {
321	>	assertSame(nse, success.getCause());
322	>	checkCompletedAbnormally(task, nse);
323		}
324	<	catch(Exception e) {
325	<	fail("unexpected exception");
324	>
325	>	try {
326	>	task.get(LONG_DELAY_MS, MILLISECONDS);
327	>	shouldThrow();
328	>	} catch (ExecutionException success) {
329	>	assertSame(nse, success.getCause());
330	>	checkCompletedAbnormally(task, nse);
331		}
332	+
333	+	assertEquals(1, task.setExceptionCount());
334	+	assertEquals(0, task.setCount());
335	+	tryToConfuseDoneTask(task);
336	+	checkCompletedAbnormally(task, nse);
337	+	assertEquals(0, task.runCount());
338		}
339
340	+	/**
341	+	* cancel(false) before run succeeds
342	+	*/
343		public void testCancelBeforeRun() {
344	<	FutureTask task = new FutureTask( new NoOpCallable());
344	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
345		assertTrue(task.cancel(false));
346	<	task.run();
347	<	assertTrue(task.isDone());
348	<	assertTrue(task.isCancelled());
346	>	task.run();
347	>	assertEquals(0, task.runCount());
348	>	assertEquals(0, task.setCount());
349	>	assertEquals(0, task.setExceptionCount());
350	>	assertTrue(task.isCancelled());
351	>	assertTrue(task.isDone());
352	>	tryToConfuseDoneTask(task);
353	>	assertEquals(0, task.runCount());
354	>	checkCancelled(task);
355		}
356
357	+	/**
358	+	* cancel(true) before run succeeds
359	+	*/
360		public void testCancelBeforeRun2() {
361	<	FutureTask task = new FutureTask( new NoOpCallable());
361	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
362		assertTrue(task.cancel(true));
363	<	task.run();
364	<	assertTrue(task.isDone());
365	<	assertTrue(task.isCancelled());
363	>	task.run();
364	>	assertEquals(0, task.runCount());
365	>	assertEquals(0, task.setCount());
366	>	assertEquals(0, task.setExceptionCount());
367	>	assertTrue(task.isCancelled());
368	>	assertTrue(task.isDone());
369	>	tryToConfuseDoneTask(task);
370	>	assertEquals(0, task.runCount());
371	>	checkCancelled(task);
372		}
373
374	+	/**
375	+	* cancel(false) of a completed task fails
376	+	*/
377		public void testCancelAfterRun() {
378	<	FutureTask task = new FutureTask( new NoOpCallable());
379	<	task.run();
378	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
379	>	task.run();
380		assertFalse(task.cancel(false));
381	<	assertTrue(task.isDone());
382	<	assertFalse(task.isCancelled());
381	>	assertEquals(1, task.runCount());
382	>	assertEquals(1, task.setCount());
383	>	assertEquals(0, task.setExceptionCount());
384	>	tryToConfuseDoneTask(task);
385	>	checkCompletedNormally(task, Boolean.TRUE);
386	>	assertEquals(1, task.runCount());
387		}
388
389	<	public void testCancelInterrupt(){
390	<	FutureTask task = new FutureTask( new Callable() {
391	<	public Object call() {
389	>	/**
390	>	* cancel(true) of a completed task fails
391	>	*/
392	>	public void testCancelAfterRun2() {
393	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
394	>	task.run();
395	>	assertFalse(task.cancel(true));
396	>	assertEquals(1, task.runCount());
397	>	assertEquals(1, task.setCount());
398	>	assertEquals(0, task.setExceptionCount());
399	>	tryToConfuseDoneTask(task);
400	>	checkCompletedNormally(task, Boolean.TRUE);
401	>	assertEquals(1, task.runCount());
402	>	}
403	>
404	>	/**
405	>	* cancel(true) interrupts a running task that subsequently succeeds
406	>	*/
407	>	public void testCancelInterrupt() {
408	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
409	>	final PublicFutureTask task =
410	>	new PublicFutureTask(new CheckedRunnable() {
411	>	public void realRun() {
412	>	pleaseCancel.countDown();
413		try {
414	<	Thread.sleep(MEDIUM_DELAY_MS);
415	<	threadFail("should throw");
416	<	}
417	<	catch (InterruptedException success) {}
418	<	return Boolean.TRUE;
419	<	} });
420	<	Thread t = new  Thread(task);
421	<	t.start();
422	<
423	<	try{
424	<	Thread.sleep(SHORT_DELAY_MS);
425	<	assertTrue(task.cancel(true));
426	<	t.join();
427	<	assertTrue(task.isDone());
428	<	assertTrue(task.isCancelled());
429	<	} catch(InterruptedException e){
430	<	fail("unexpected exception");
162	<	}
414	>	delay(LONG_DELAY_MS);
415	>	shouldThrow();
416	>	} catch (InterruptedException success) {}
417	>	assertFalse(Thread.interrupted());
418	>	}});
419	>
420	>	Thread t = newStartedThread(task);
421	>	await(pleaseCancel);
422	>	assertTrue(task.cancel(true));
423	>	assertTrue(task.isCancelled());
424	>	assertTrue(task.isDone());
425	>	awaitTermination(t);
426	>	assertEquals(1, task.runCount());
427	>	assertEquals(1, task.setCount());
428	>	assertEquals(0, task.setExceptionCount());
429	>	tryToConfuseDoneTask(task);
430	>	checkCancelled(task);
431		}
432
433	+	/**
434	+	* cancel(true) tries to interrupt a running task, but
435	+	* Thread.interrupt throws (simulating a restrictive security
436	+	* manager)
437	+	*/
438	+	public void testCancelInterrupt_ThrowsSecurityException() {
439	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
440	+	final CountDownLatch cancelled = new CountDownLatch(1);
441	+	final PublicFutureTask task =
442	+	new PublicFutureTask(new CheckedRunnable() {
443	+	public void realRun() {
444	+	pleaseCancel.countDown();
445	+	await(cancelled);
446	+	assertFalse(Thread.interrupted());
447	+	}});
448	+
449	+	final Thread t = new Thread(task) {
450	+	// Simulate a restrictive security manager.
451	+	@Override public void interrupt() {
452	+	throw new SecurityException();
453	+	}};
454	+	t.setDaemon(true);
455	+	t.start();
456
457	<	public void testCancelNoInterrupt(){
458	<	FutureTask task = new FutureTask( new Callable() {
459	<	public Object call() {
457	>	await(pleaseCancel);
458	>	try {
459	>	task.cancel(true);
460	>	shouldThrow();
461	>	} catch (SecurityException expected) {}
462	>
463	>	// We failed to deliver the interrupt, but the world retains
464	>	// its sanity, as if we had done task.cancel(false)
465	>	assertTrue(task.isCancelled());
466	>	assertTrue(task.isDone());
467	>	assertEquals(1, task.runCount());
468	>	assertEquals(1, task.doneCount());
469	>	assertEquals(0, task.setCount());
470	>	assertEquals(0, task.setExceptionCount());
471	>	cancelled.countDown();
472	>	awaitTermination(t);
473	>	assertEquals(1, task.setCount());
474	>	assertEquals(0, task.setExceptionCount());
475	>	tryToConfuseDoneTask(task);
476	>	checkCancelled(task);
477	>	}
478	>
479	>	/**
480	>	* cancel(true) interrupts a running task that subsequently throws
481	>	*/
482	>	public void testCancelInterrupt_taskFails() {
483	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
484	>	final PublicFutureTask task =
485	>	new PublicFutureTask(new Runnable() {
486	>	public void run() {
487	>	pleaseCancel.countDown();
488		try {
489	<	Thread.sleep(MEDIUM_DELAY_MS);
490	<	}
491	<	catch (InterruptedException success) {
492	<	threadFail("should not interrupt");
493	<	}
489	>	delay(LONG_DELAY_MS);
490	>	threadShouldThrow();
491	>	} catch (InterruptedException success) {
492	>	} catch (Throwable t) { threadUnexpectedException(t); }
493	>	throw new RuntimeException();
494	>	}});
495	>
496	>	Thread t = newStartedThread(task);
497	>	await(pleaseCancel);
498	>	assertTrue(task.cancel(true));
499	>	assertTrue(task.isCancelled());
500	>	awaitTermination(t);
501	>	assertEquals(1, task.runCount());
502	>	assertEquals(0, task.setCount());
503	>	assertEquals(1, task.setExceptionCount());
504	>	tryToConfuseDoneTask(task);
505	>	checkCancelled(task);
506	>	}
507	>
508	>	/**
509	>	* cancel(false) does not interrupt a running task
510	>	*/
511	>	public void testCancelNoInterrupt() {
512	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
513	>	final CountDownLatch cancelled = new CountDownLatch(1);
514	>	final PublicFutureTask task =
515	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
516	>	public Boolean realCall() {
517	>	pleaseCancel.countDown();
518	>	await(cancelled);
519	>	assertFalse(Thread.interrupted());
520		return Boolean.TRUE;
521	<	} });
522	<	Thread t = new  Thread(task);
523	<	t.start();
524	<
525	<	try{
526	<	Thread.sleep(SHORT_DELAY_MS);
527	<	assertTrue(task.cancel(false));
528	<	t.join();
529	<	assertTrue(task.isDone());
530	<	assertTrue(task.isCancelled());
531	<	} catch(InterruptedException e){
532	<	fail("unexpected exception");
521	>	}});
522	>
523	>	Thread t = newStartedThread(task);
524	>	await(pleaseCancel);
525	>	assertTrue(task.cancel(false));
526	>	assertTrue(task.isCancelled());
527	>	cancelled.countDown();
528	>	awaitTermination(t);
529	>	assertEquals(1, task.runCount());
530	>	assertEquals(1, task.setCount());
531	>	assertEquals(0, task.setExceptionCount());
532	>	tryToConfuseDoneTask(task);
533	>	checkCancelled(task);
534	>	}
535	>
536	>	/**
537	>	* run in one thread causes get in another thread to retrieve value
538	>	*/
539	>	public void testGetRun() {
540	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
541	>
542	>	final PublicFutureTask task =
543	>	new PublicFutureTask(new CheckedCallable<Object>() {
544	>	public Object realCall() {
545	>	return two;
546	>	}});
547	>
548	>	Thread t1 = newStartedThread(new CheckedRunnable() {
549	>	public void realRun() throws Exception {
550	>	pleaseRun.countDown();
551	>	assertSame(two, task.get());
552	>	}});
553	>
554	>	Thread t2 = newStartedThread(new CheckedRunnable() {
555	>	public void realRun() throws Exception {
556	>	pleaseRun.countDown();
557	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
558	>	}});
559	>
560	>	await(pleaseRun);
561	>	checkNotDone(task);
562	>	assertTrue(t1.isAlive());
563	>	assertTrue(t2.isAlive());
564	>	task.run();
565	>	checkCompletedNormally(task, two);
566	>	assertEquals(1, task.runCount());
567	>	assertEquals(1, task.setCount());
568	>	assertEquals(0, task.setExceptionCount());
569	>	awaitTermination(t1);
570	>	awaitTermination(t2);
571	>	tryToConfuseDoneTask(task);
572	>	checkCompletedNormally(task, two);
573	>	}
574	>
575	>	/**
576	>	* set in one thread causes get in another thread to retrieve value
577	>	*/
578	>	public void testGetSet() {
579	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
580	>
581	>	final PublicFutureTask task =
582	>	new PublicFutureTask(new CheckedCallable<Object>() {
583	>	public Object realCall() throws InterruptedException {
584	>	return two;
585	>	}});
586	>
587	>	Thread t1 = newStartedThread(new CheckedRunnable() {
588	>	public void realRun() throws Exception {
589	>	pleaseSet.countDown();
590	>	assertSame(two, task.get());
591	>	}});
592	>
593	>	Thread t2 = newStartedThread(new CheckedRunnable() {
594	>	public void realRun() throws Exception {
595	>	pleaseSet.countDown();
596	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
597	>	}});
598	>
599	>	await(pleaseSet);
600	>	checkNotDone(task);
601	>	assertTrue(t1.isAlive());
602	>	assertTrue(t2.isAlive());
603	>	task.set(two);
604	>	assertEquals(0, task.runCount());
605	>	assertEquals(1, task.setCount());
606	>	assertEquals(0, task.setExceptionCount());
607	>	tryToConfuseDoneTask(task);
608	>	checkCompletedNormally(task, two);
609	>	awaitTermination(t1);
610	>	awaitTermination(t2);
611	>	}
612	>
613	>	/**
614	>	* Cancelling a task causes timed get in another thread to throw
615	>	* CancellationException
616	>	*/
617	>	public void testTimedGet_Cancellation() {
618	>	testTimedGet_Cancellation(false);
619	>	}
620	>	public void testTimedGet_Cancellation_interrupt() {
621	>	testTimedGet_Cancellation(true);
622	>	}
623	>	public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) {
624	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
625	>	final CountDownLatch cancelled = new CountDownLatch(1);
626	>	final Callable<Object> callable =
627	>	new CheckedCallable<Object>() {
628	>	public Object realCall() throws InterruptedException {
629	>	pleaseCancel.countDown();
630	>	if (mayInterruptIfRunning) {
631	>	try {
632	>	delay(2*LONG_DELAY_MS);
633	>	} catch (InterruptedException success) {}
634	>	} else {
635	>	await(cancelled);
636	>	}
637	>	return two;
638	>	}};
639	>	final PublicFutureTask task = new PublicFutureTask(callable);
640	>
641	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
642	>	public void realRun() throws Exception {
643	>	pleaseCancel.countDown();
644	>	task.get();
645	>	}};
646	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
647	>	public void realRun() throws Exception {
648	>	pleaseCancel.countDown();
649	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
650	>	}};
651	>	t1.start();
652	>	t2.start();
653	>	Thread t3 = newStartedThread(task);
654	>	await(pleaseCancel);
655	>	checkIsRunning(task);
656	>	task.cancel(mayInterruptIfRunning);
657	>	checkCancelled(task);
658	>	awaitTermination(t1);
659	>	awaitTermination(t2);
660	>	cancelled.countDown();
661	>	awaitTermination(t3);
662	>	assertEquals(1, task.runCount());
663	>	assertEquals(1, task.setCount());
664	>	assertEquals(0, task.setExceptionCount());
665	>	tryToConfuseDoneTask(task);
666	>	checkCancelled(task);
667	>	}
668	>
669	>	/**
670	>	* A runtime exception in task causes get to throw ExecutionException
671	>	*/
672	>	public void testGet_ExecutionException() throws InterruptedException {
673	>	final ArithmeticException e = new ArithmeticException();
674	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
675	>	public Object call() {
676	>	throw e;
677	>	}});
678	>
679	>	task.run();
680	>	assertEquals(1, task.runCount());
681	>	assertEquals(0, task.setCount());
682	>	assertEquals(1, task.setExceptionCount());
683	>	try {
684	>	task.get();
685	>	shouldThrow();
686	>	} catch (ExecutionException success) {
687	>	assertSame(e, success.getCause());
688	>	tryToConfuseDoneTask(task);
689	>	checkCompletedAbnormally(task, success.getCause());
690		}
691		}
692
693	<	public void testGet1() {
694	<	final FutureTask ft = new FutureTask(new Callable(){
695	<	public Object call(){
696	<	try{
697	<	Thread.sleep(MEDIUM_DELAY_MS);
698	<	} catch(InterruptedException e){
699	<	threadFail("unexpected exception");
700	<	}
701	<	return Boolean.TRUE;
702	<	}
703	<	});
704	<	Thread t = new Thread(new Runnable(){
705	<	public void run(){
706	<	try{
707	<	ft.get();
708	<	} catch(Exception e){
709	<	threadFail("unexpected exception");
710	<	}
711	<	}
712	<	});
713	<	try{
714	<	assertFalse(ft.isDone());
715	<	assertFalse(ft.isCancelled());
716	<	t.start();
717	<	Thread.sleep(SHORT_DELAY_MS);
718	<	ft.run();
719	<	t.join();
720	<	assertTrue(ft.isDone());
721	<	assertFalse(ft.isCancelled());
722	<	} catch(InterruptedException e){
723	<	fail("unexpected exception");
724	<
725	<	}
726	<	}
727	<
728	<	public void testTimedGet1() {
729	<	final FutureTask ft = new FutureTask(new Callable(){
730	<	public Object call(){
731	<	try{
732	<	Thread.sleep(MEDIUM_DELAY_MS);
733	<	} catch(InterruptedException e){
734	<	threadFail("unexpected exception");
735	<	}
736	<	return Boolean.TRUE;
737	<	}
738	<	});
739	<	Thread t = new Thread(new Runnable(){
740	<	public void run(){
239	<	try{
240	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
241	<	} catch(TimeoutException success) {
242	<	} catch(Exception e){
243	<	threadFail("unexpected exception");
244	<	}
245	<	}
246	<	});
247	<	try{
248	<	assertFalse(ft.isDone());
249	<	assertFalse(ft.isCancelled());
250	<	t.start();
251	<	ft.run();
252	<	t.join();
253	<	assertTrue(ft.isDone());
254	<	assertFalse(ft.isCancelled());
255	<	} catch(InterruptedException e){
256	<	fail("unexpected exception");
257	<
258	<	}
693	>	/**
694	>	* A runtime exception in task causes timed get to throw ExecutionException
695	>	*/
696	>	public void testTimedGet_ExecutionException2() throws Exception {
697	>	final ArithmeticException e = new ArithmeticException();
698	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
699	>	public Object call() {
700	>	throw e;
701	>	}});
702	>
703	>	task.run();
704	>	try {
705	>	task.get(LONG_DELAY_MS, MILLISECONDS);
706	>	shouldThrow();
707	>	} catch (ExecutionException success) {
708	>	assertSame(e, success.getCause());
709	>	tryToConfuseDoneTask(task);
710	>	checkCompletedAbnormally(task, success.getCause());
711	>	}
712	>	}
713	>
714	>	/**
715	>	* get is interruptible
716	>	*/
717	>	public void testGet_interruptible() {
718	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
719	>	final FutureTask task = new FutureTask(new NoOpCallable());
720	>	Thread t = newStartedThread(new CheckedRunnable() {
721	>	public void realRun() throws Exception {
722	>	Thread.currentThread().interrupt();
723	>	try {
724	>	task.get();
725	>	shouldThrow();
726	>	} catch (InterruptedException success) {}
727	>	assertFalse(Thread.interrupted());
728	>
729	>	pleaseInterrupt.countDown();
730	>	try {
731	>	task.get();
732	>	shouldThrow();
733	>	} catch (InterruptedException success) {}
734	>	assertFalse(Thread.interrupted());
735	>	}});
736	>
737	>	await(pleaseInterrupt);
738	>	t.interrupt();
739	>	awaitTermination(t);
740	>	checkNotDone(task);
741		}
742
743	+	/**
744	+	* timed get is interruptible
745	+	*/
746	+	public void testTimedGet_interruptible() {
747	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
748	+	final FutureTask task = new FutureTask(new NoOpCallable());
749	+	Thread t = newStartedThread(new CheckedRunnable() {
750	+	public void realRun() throws Exception {
751	+	Thread.currentThread().interrupt();
752	+	try {
753	+	task.get(2*LONG_DELAY_MS, MILLISECONDS);
754	+	shouldThrow();
755	+	} catch (InterruptedException success) {}
756	+	assertFalse(Thread.interrupted());
757	+
758	+	pleaseInterrupt.countDown();
759	+	try {
760	+	task.get(2*LONG_DELAY_MS, MILLISECONDS);
761	+	shouldThrow();
762	+	} catch (InterruptedException success) {}
763	+	assertFalse(Thread.interrupted());
764	+	}});
765	+
766	+	await(pleaseInterrupt);
767	+	t.interrupt();
768	+	awaitTermination(t);
769	+	checkNotDone(task);
770	+	}
771
772	<	public void testGet_Cancellation(){
773	<	final FutureTask ft = new FutureTask(new Callable(){
774	<	public Object call(){
775	<	try{
776	<	Thread.sleep(MEDIUM_DELAY_MS);
777	<	} catch(InterruptedException e){
778	<	threadFail("unexpected exception");
779	<	}
780	<	return Boolean.TRUE;
781	<	}
782	<	});
783	<	try {
274	<	Thread.sleep(SHORT_DELAY_MS);
275	<	Thread t = new Thread(new Runnable(){
276	<	public void run(){
277	<	try{
278	<	ft.get();
279	<	threadFail("should throw");
280	<	} catch(CancellationException success){
281	<	}
282	<	catch(Exception e){
283	<	threadFail("unexpected exception");
284	<	}
285	<	}
286	<	});
287	<	t.start();
288	<	ft.cancel(true);
289	<	t.join();
290	<	} catch(InterruptedException success){
291	<	fail("unexpected exception");
292	<	}
293	<	}
294	<
295	<	public void testGet_Cancellation2(){
296	<	final FutureTask ft = new FutureTask(new Callable(){
297	<	public Object call(){
298	<	try{
299	<	Thread.sleep(SHORT_DELAY_MS);
300	<	} catch(InterruptedException e) {
301	<	threadFail("unexpected exception");
302	<	}
303	<	return Boolean.TRUE;
304	<	}
305	<	});
306	<	try{
307	<	Thread.sleep(SHORT_DELAY_MS);
308	<	Thread t = new Thread(new Runnable(){
309	<	public void run(){
310	<	try{
311	<	ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
312	<	threadFail("should throw");
313	<	} catch(CancellationException success) {}
314	<	catch(Exception e){
315	<	threadFail("unexpected exception");
316	<	}
317	<	}
318	<	});
319	<	t.start();
320	<	Thread.sleep(SHORT_DELAY_MS);
321	<	ft.cancel(true);
322	<	Thread.sleep(SHORT_DELAY_MS);
323	<	t.join();
324	<	} catch(InterruptedException ie){
325	<	fail("unexpected exception");
326	<	}
327	<	}
328	<
329	<	public void testGet_ExecutionException(){
330	<	final FutureTask ft = new FutureTask(new Callable(){
331	<	public Object call(){
332	<	int i = 5/0;
333	<	return Boolean.TRUE;
334	<	}
335	<	});
336	<	try{
337	<	ft.run();
338	<	ft.get();
339	<	fail("should throw");
340	<	} catch(ExecutionException success){
341	<	}
342	<	catch(Exception e){
343	<	fail("unexpected exception");
344	<	}
345	<	}
346	<
347	<	public void testTimedGet_ExecutionException2(){
348	<	final FutureTask ft = new FutureTask(new Callable(){
349	<	public Object call(){
350	<	int i = 5/0;
351	<	return Boolean.TRUE;
352	<	}
353	<	});
354	<	try{
355	<	ft.run();
356	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
357	<	fail("should throw");
358	<	} catch(ExecutionException success) {
359	<	} catch(TimeoutException success) { } // unlikely but OK
360	<	catch(Exception e){
361	<	fail("unexpected exception");
362	<	}
363	<	}
364	<
365	<
366	<	public void testGet_InterruptedException(){
367	<	final FutureTask ft = new FutureTask(new NoOpCallable());
368	<	Thread t = new Thread(new Runnable(){
369	<	public void run(){
370	<	try{
371	<	ft.get();
372	<	threadFail("should throw");
373	<	} catch(InterruptedException success){
374	<	} catch(Exception e){
375	<	threadFail("unexpected exception");
376	<	}
377	<	}
378	<	});
379	<	try {
380	<	t.start();
381	<	Thread.sleep(SHORT_DELAY_MS);
382	<	t.interrupt();
383	<	t.join();
384	<	} catch(Exception e){
385	<	fail("unexpected exception");
386	<	}
387	<	}
388	<
389	<	public void testTimedGet_InterruptedException2(){
390	<	final FutureTask ft = new FutureTask(new NoOpCallable());
391	<	Thread t = new Thread(new Runnable(){
392	<	public void run(){
393	<	try{
394	<	ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
395	<	threadFail("should throw");
396	<	} catch(InterruptedException success){}
397	<	catch(Exception e){
398	<	threadFail("unexpected exception");
399	<	}
400	<	}
401	<	});
402	<	try {
403	<	t.start();
404	<	Thread.sleep(SHORT_DELAY_MS);
405	<	t.interrupt();
406	<	t.join();
407	<	} catch(Exception e){
408	<	fail("unexpected exception");
409	<	}
410	<	}
411	<
412	<	public void testGet_TimeoutException(){
413	<	try{
414	<	FutureTask ft = new FutureTask(new NoOpCallable());
415	<	ft.get(1,TimeUnit.MILLISECONDS);
416	<	fail("should throw");
417	<	} catch(TimeoutException success){}
418	<	catch(Exception success){
419	<	fail("unexpected exception");
420	<	}
772	>	/**
773	>	* A timed out timed get throws TimeoutException
774	>	*/
775	>	public void testGet_TimeoutException() throws Exception {
776	>	FutureTask task = new FutureTask(new NoOpCallable());
777	>	long startTime = System.nanoTime();
778	>	try {
779	>	task.get(timeoutMillis(), MILLISECONDS);
780	>	shouldThrow();
781	>	} catch (TimeoutException success) {
782	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
783	>	}
784		}
785	<
785	>
786	>	/**
787	>	* timed get with null TimeUnit throws NullPointerException
788	>	*/
789	>	public void testGet_NullTimeUnit() throws Exception {
790	>	FutureTask task = new FutureTask(new NoOpCallable());
791	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
792	>
793	>	for (long timeout : timeouts) {
794	>	try {
795	>	task.get(timeout, null);
796	>	shouldThrow();
797	>	} catch (NullPointerException success) {}
798	>	}
799	>
800	>	task.run();
801	>
802	>	for (long timeout : timeouts) {
803	>	try {
804	>	task.get(timeout, null);
805	>	shouldThrow();
806	>	} catch (NullPointerException success) {}
807	>	}
808	>	}
809	>
810	>	/**
811	>	* timed get with most negative timeout works correctly (i.e. no
812	>	* underflow bug)
813	>	*/
814	>	public void testGet_NegativeInfinityTimeout() throws Exception {
815	>	final ExecutorService pool = Executors.newFixedThreadPool(10);
816	>	final Runnable nop = new Runnable() { public void run() {}};
817	>	final FutureTask<Void> task = new FutureTask<>(nop, null);
818	>	final List<Future<?>> futures = new ArrayList<>();
819	>	Runnable r = new Runnable() { public void run() {
820	>	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
821	>	try {
822	>	task.get(timeout, NANOSECONDS);
823	>	shouldThrow();
824	>	} catch (TimeoutException success) {
825	>	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
826	>	for (int i = 0; i < 10; i++)
827	>	futures.add(pool.submit(r));
828	>	try {
829	>	joinPool(pool);
830	>	for (Future<?> future : futures)
831	>	checkCompletedNormally(future, null);
832	>	} finally {
833	>	task.run();         // last resort to help terminate
834	>	}
835	>	}
836	>
837	>	/**
838	>	* toString indicates current completion state
839	>	*/
840	>	public void testToString_incomplete() {
841	>	FutureTask<String> f = new FutureTask<>(() -> "");
842	>	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
843	>	if (testImplementationDetails)
844	>	assertTrue(f.toString().startsWith(
845	>	identityString(f) + "[Not completed, task ="));
846	>	}
847	>
848	>	public void testToString_normal() {
849	>	FutureTask<String> f = new FutureTask<>(() -> "");
850	>	f.run();
851	>	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
852	>	if (testImplementationDetails)
853	>	assertEquals(identityString(f) + "[Completed normally]",
854	>	f.toString());
855	>	}
856	>
857	>	public void testToString_exception() {
858	>	FutureTask<String> f = new FutureTask<>(
859	>	() -> { throw new ArithmeticException(); });
860	>	f.run();
861	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
862	>	if (testImplementationDetails)
863	>	assertTrue(f.toString().startsWith(
864	>	identityString(f) + "[Completed exceptionally: "));
865	>	}
866	>
867	>	public void testToString_cancelled() {
868	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
869	>	FutureTask<String> f = new FutureTask<>(() -> "");
870	>	assertTrue(f.cancel(mayInterruptIfRunning));
871	>	assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]"));
872	>	if (testImplementationDetails)
873	>	assertEquals(identityString(f) + "[Cancelled]",
874	>	f.toString());
875	>	}
876	>	}
877	>
878		}

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