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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 1.45 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.*;
11	<	import java.util.*;
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	>	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	<	/**
40	<	* Subclass to expose protected methods
41	<	*/
42	<	static class MyFutureTask extends FutureTask {
43	<	public MyFutureTask(Callable r) { super(r); }
44	<	public boolean reset() { return super.reset(); }
45	<	public void setCancelled() { super.setCancelled(); }
46	<	public void setDone() { super.setDone(); }
47	<	public void set(Object x) { super.set(x); }
48	<	public void setException(Throwable t) { super.setException(t); }
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	<	public void testConstructor(){
117	>	void checkCancelled(Future<?> f) {
118	>	checkIsDone(f);
119	>	assertTrue(f.isCancelled());
120	>
121		try {
122	<	FutureTask task = new FutureTask(null);
123	<	fail("should throw");
124	<	}
125	<	catch(NullPointerException success) {
122	>	f.get();
123	>	shouldThrow();
124	>	} catch (CancellationException success) {
125	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
126	>
127	>	try {
128	>	f.get(5L, SECONDS);
129	>	shouldThrow();
130	>	} catch (CancellationException success) {
131	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
132	>	}
133	>
134	>	void tryToConfuseDoneTask(PublicFutureTask pf) {
135	>	pf.set(new Object());
136	>	pf.setException(new Error());
137	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
138	>	pf.cancel(mayInterruptIfRunning);
139		}
140		}
141
142	<	public void testConstructor2(){
142	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
143	>	checkIsDone(f);
144	>	assertFalse(f.isCancelled());
145	>
146		try {
147	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
148	<	fail("should throw");
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	<	catch(NullPointerException success) {
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	<	public void testIsDone(){
231	<	FutureTask task = new FutureTask( new NoOpCallable());
232	<	task.run();
233	<	assertTrue(task.isDone());
234	<	assertFalse(task.isCancelled());
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	<	public void testReset(){
241	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
242	<	task.run();
243	<	assertTrue(task.isDone());
244	<	assertTrue(task.reset());
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	<	public void testResetAfterCancel() {
251	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
252	<	assertTrue(task.cancel(false));
253	<	task.run();
254	<	assertTrue(task.isDone());
255	<	assertTrue(task.isCancelled());
256	<	assertFalse(task.reset());
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	<	public void testSetDone() {
263	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
264	<	task.setDone();
265	<	assertTrue(task.isDone());
266	<	assertFalse(task.isCancelled());
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	<	public void testSetCancelled() {
278	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
279	<	assertTrue(task.cancel(false));
280	<	task.setCancelled();
281	<	assertTrue(task.isDone());
282	<	assertTrue(task.isCancelled());
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	<	public void testSet() {
297	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
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	<	try {
303	<	assertEquals(task.get(), one);
304	<	}
305	<	catch(Exception e) {
306	<	fail("unexpected exception");
307	<	}
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	<	public void testSetException() {
312	>	/**
313	>	* setException causes get to throw ExecutionException
314	>	*/
315	>	public void testSetException_get() throws Exception {
316		Exception nse = new NoSuchElementException();
317	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
317	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
318		task.setException(nse);
319	+
320		try {
321	<	Object x = task.get();
322	<	fail("should throw");
323	<	}
324	<	catch(ExecutionException ee) {
325	<	Throwable cause = ee.getCause();
110	<	assertEquals(cause, nse);
321	>	task.get();
322	>	shouldThrow();
323	>	} catch (ExecutionException success) {
324	>	assertSame(nse, success.getCause());
325	>	checkCompletedAbnormally(task, nse);
326		}
327	<	catch(Exception e) {
328	<	fail("unexpected exception");
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 NoOpCallable());
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 NoOpCallable());
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 NoOpCallable());
382	<	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());
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	<	public void testCancelInterrupt(){
408	<	FutureTask task = new FutureTask( new Callable() {
409	<	public Object call() {
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	<	Thread.sleep(MEDIUM_DELAY_MS);
418	<	threadFail("should throw");
419	<	}
420	<	catch (InterruptedException success) {}
421	<	return Boolean.TRUE;
422	<	} });
423	<	Thread t = new  Thread(task);
424	<	t.start();
425	<
426	<	try{
427	<	Thread.sleep(SHORT_DELAY_MS);
428	<	assertTrue(task.cancel(true));
429	<	t.join();
430	<	assertTrue(task.isDone());
431	<	assertTrue(task.isCancelled());
432	<	} catch(InterruptedException e){
433	<	fail("unexpected exception");
162	<	}
417	>	delay(LONG_DELAY_MS);
418	>	shouldThrow();
419	>	} catch (InterruptedException success) {}
420	>	assertFalse(Thread.interrupted());
421	>	}});
422	>
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	<	public void testCancelNoInterrupt(){
483	<	FutureTask task = new FutureTask( new Callable() {
484	<	public Object call() {
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(MEDIUM_DELAY_MS);
493	<	}
494	<	catch (InterruptedException success) {
495	<	threadFail("should not interrupt");
496	<	}
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(false));
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	<	public void testGet1() {
697	<	final FutureTask ft = new FutureTask(new Callable(){
698	<	public Object call(){
699	<	try{
700	<	Thread.sleep(MEDIUM_DELAY_MS);
701	<	} catch(InterruptedException e){
702	<	threadFail("unexpected exception");
703	<	}
704	<	return Boolean.TRUE;
705	<	}
706	<	});
707	<	Thread t = new Thread(new Runnable(){
708	<	public void run(){
709	<	try{
710	<	ft.get();
711	<	} catch(Exception e){
712	<	threadFail("unexpected exception");
713	<	}
714	<	}
210	<	});
211	<	try{
212	<	assertFalse(ft.isDone());
213	<	assertFalse(ft.isCancelled());
214	<	t.start();
215	<	Thread.sleep(SHORT_DELAY_MS);
216	<	ft.run();
217	<	t.join();
218	<	assertTrue(ft.isDone());
219	<	assertFalse(ft.isCancelled());
220	<	} catch(InterruptedException e){
221	<	fail("unexpected exception");
222	<
223	<	}
224	<	}
225	<
226	<	public void testTimedGet1() {
227	<	final FutureTask ft = new FutureTask(new Callable(){
228	<	public Object call(){
229	<	try{
230	<	Thread.sleep(MEDIUM_DELAY_MS);
231	<	} catch(InterruptedException e){
232	<	threadFail("unexpected exception");
233	<	}
234	<	return Boolean.TRUE;
235	<	}
236	<	});
237	<	Thread t = new Thread(new Runnable(){
238	<	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	<	}
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	>	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	+	/**
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	<	public void testGet_Cancellation(){
747	<	final FutureTask ft = new FutureTask(new Callable(){
748	<	public Object call(){
749	<	try{
750	<	Thread.sleep(MEDIUM_DELAY_MS);
751	<	} catch(InterruptedException e){
752	<	threadFail("unexpected exception");
753	<	}
754	<	return Boolean.TRUE;
755	<	}
756	<	});
757	<	try {
758	<	Thread.sleep(SHORT_DELAY_MS);
759	<	Thread t = new Thread(new Runnable(){
760	<	public void run(){
761	<	try{
762	<	ft.get();
763	<	threadFail("should throw");
764	<	} catch(CancellationException success){
765	<	}
766	<	catch(Exception e){
767	<	threadFail("unexpected exception");
768	<	}
769	<	}
770	<	});
771	<	t.start();
772	<	ft.cancel(true);
773	<	t.join();
774	<	} catch(InterruptedException success){
775	<	fail("unexpected exception");
776	<	}
777	<	}
778	<
779	<	public void testGet_Cancellation2(){
780	<	final FutureTask ft = new FutureTask(new Callable(){
781	<	public Object call(){
782	<	try{
783	<	Thread.sleep(SHORT_DELAY_MS);
784	<	} catch(InterruptedException e) {
785	<	threadFail("unexpected exception");
786	<	}
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	<	}
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	<
788	>
789	>	/**
790	>	* timed get with null TimeUnit throws NullPointerException
791	>	*/
792	>	public void testGet_NullTimeUnit() throws Exception {
793	>	FutureTask task = new FutureTask(new NoOpCallable());
794	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
795	>
796	>	for (long timeout : timeouts) {
797	>	try {
798	>	task.get(timeout, null);
799	>	shouldThrow();
800	>	} catch (NullPointerException success) {}
801	>	}
802	>
803	>	task.run();
804	>
805	>	for (long timeout : timeouts) {
806	>	try {
807	>	task.get(timeout, null);
808	>	shouldThrow();
809	>	} catch (NullPointerException success) {}
810	>	}
811	>	}
812	>
813	>	/**
814	>	* timed get with most negative timeout works correctly (i.e. no
815	>	* underflow bug)
816	>	*/
817	>	public void testGet_NegativeInfinityTimeout() throws Exception {
818	>	final ExecutorService pool = Executors.newFixedThreadPool(10);
819	>	final Runnable nop = new Runnable() { public void run() {}};
820	>	final FutureTask<Void> task = new FutureTask<>(nop, null);
821	>	final List<Future<?>> futures = new ArrayList<>();
822	>	Runnable r = new Runnable() { public void run() {
823	>	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
824	>	try {
825	>	task.get(timeout, NANOSECONDS);
826	>	shouldThrow();
827	>	} catch (TimeoutException success) {
828	>	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
829	>	for (int i = 0; i < 10; i++)
830	>	futures.add(pool.submit(r));
831	>	try {
832	>	joinPool(pool);
833	>	for (Future<?> future : futures)
834	>	checkCompletedNormally(future, null);
835	>	} finally {
836	>	task.run();         // last resort to help terminate
837	>	}
838	>	}
839	>
840		}

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