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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.3 by dl, Fri Sep 12 15:40:25 2003 UTC vs.
Revision 1.34 by jsr166, Sat Dec 29 19:07:32 2012 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.*;
10	>	import java.util.concurrent.Callable;
11	>	import java.util.concurrent.CancellationException;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.ExecutionException;
14	>	import java.util.concurrent.Future;
15	>	import java.util.concurrent.FutureTask;
16	>	import java.util.concurrent.TimeoutException;
17	>	import java.util.concurrent.atomic.AtomicInteger;
18	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
19	>	import static java.util.concurrent.TimeUnit.SECONDS;
20	>	import java.util.*;
21
22	<	public class FutureTaskTest extends TestCase {
22	>	public class FutureTaskTest extends JSR166TestCase {
23
24		public static void main(String[] args) {
25	<	junit.textui.TestRunner.run (suite());
25	>	junit.textui.TestRunner.run(suite());
26		}
27		public static Test suite() {
28	<	return new TestSuite(FutureTaskTest.class);
28	>	return new TestSuite(FutureTaskTest.class);
29		}
30
31	<	private static long SHORT_DELAY_MS = 100;
32	<	private static long MEDIUM_DELAY_MS = 1000;
33	<	private static long LONG_DELAY_MS = 10000;
31	>	void checkIsDone(Future<?> f) {
32	>	assertTrue(f.isDone());
33	>	assertFalse(f.cancel(false));
34	>	assertFalse(f.cancel(true));
35	>	if (f instanceof PublicFutureTask) {
36	>	PublicFutureTask pf = (PublicFutureTask) f;
37	>	assertEquals(1, pf.doneCount());
38	>	assertFalse(pf.runAndReset());
39	>	assertEquals(1, pf.doneCount());
40	>
41	>	// Check that run and runAndReset have no effect.
42	>	int savedRunCount = pf.runCount();
43	>	int savedSetCount = pf.setCount();
44	>	int savedSetExceptionCount = pf.setExceptionCount();
45	>	pf.run();
46	>	pf.runAndReset();
47	>	assertEquals(savedRunCount, pf.runCount());
48	>	assertEquals(savedSetCount, pf.setCount());
49	>	assertEquals(savedSetExceptionCount, pf.setExceptionCount());
50	>	assertTrue(f.isDone());
51	>	}
52	>	}
53
54	<	public void testConstructor(){
55	<	try {
56	<	FutureTask task = new FutureTask(null);
57	<	fail("should throw");
54	>	void checkNotDone(Future<?> f) {
55	>	assertFalse(f.isDone());
56	>	assertFalse(f.isCancelled());
57	>	if (f instanceof PublicFutureTask) {
58	>	PublicFutureTask pf = (PublicFutureTask) f;
59	>	assertEquals(0, pf.doneCount());
60	>	assertEquals(0, pf.setCount());
61	>	assertEquals(0, pf.setExceptionCount());
62		}
63	<	catch(NullPointerException success) {
63	>	}
64	>
65	>	void checkIsRunning(Future<?> f) {
66	>	checkNotDone(f);
67	>	if (f instanceof FutureTask) {
68	>	FutureTask ft = (FutureTask<?>) f;
69	>	// Check that run methods do nothing
70	>	ft.run();
71	>	if (f instanceof PublicFutureTask)
72	>	assertFalse(((PublicFutureTask) f).runAndReset());
73	>	checkNotDone(f);
74		}
75		}
76
77	<	public void testConstructor2(){
77	>	<T> void checkCompletedNormally(Future<T> f, T expected) {
78	>	checkIsDone(f);
79	>	assertFalse(f.isCancelled());
80	>
81		try {
82	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
83	<	fail("should throw");
84	<	}
85	<	catch(NullPointerException success) {
82	>	assertSame(expected, f.get());
83	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
84	>	try {
85	>	assertSame(expected, f.get(5L, SECONDS));
86	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
87	>	}
88	>
89	>	void checkCancelled(Future<?> f) {
90	>	checkIsDone(f);
91	>	assertTrue(f.isCancelled());
92	>
93	>	try {
94	>	f.get();
95	>	shouldThrow();
96	>	} catch (CancellationException success) {
97	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
98	>
99	>	try {
100	>	f.get(5L, SECONDS);
101	>	shouldThrow();
102	>	} catch (CancellationException success) {
103	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
104	>	}
105	>
106	>	void tryToConfuseDoneTask(PublicFutureTask pf) {
107	>	pf.set(new Object());
108	>	pf.setException(new Error());
109	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
110	>	pf.cancel(true);
111		}
112		}
113
114	<	public void testIsDone(){
115	<	FutureTask task = new FutureTask( new Callable() {
116	<	public Object call() { return Boolean.TRUE; } });
117	<	task.run();
118	<	assertTrue(task.isDone());
119	<	assertFalse(task.isCancelled());
114	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
115	>	checkIsDone(f);
116	>	assertFalse(f.isCancelled());
117	>
118	>	try {
119	>	f.get();
120	>	shouldThrow();
121	>	} catch (ExecutionException success) {
122	>	assertSame(t, success.getCause());
123	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
124	>
125	>	try {
126	>	f.get(5L, SECONDS);
127	>	shouldThrow();
128	>	} catch (ExecutionException success) {
129	>	assertSame(t, success.getCause());
130	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
131	>	}
132	>
133	>	/**
134	>	* Subclass to expose protected methods
135	>	*/
136	>	static class PublicFutureTask extends FutureTask {
137	>	private final AtomicInteger runCount;
138	>	private final AtomicInteger doneCount = new AtomicInteger(0);
139	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
140	>	private final AtomicInteger setCount = new AtomicInteger(0);
141	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
142	>	public int runCount() { return runCount.get(); }
143	>	public int doneCount() { return doneCount.get(); }
144	>	public int runAndResetCount() { return runAndResetCount.get(); }
145	>	public int setCount() { return setCount.get(); }
146	>	public int setExceptionCount() { return setExceptionCount.get(); }
147	>
148	>	PublicFutureTask(Runnable runnable) {
149	>	this(runnable, seven);
150	>	}
151	>	PublicFutureTask(Runnable runnable, Object result) {
152	>	this(runnable, result, new AtomicInteger(0));
153	>	}
154	>	private PublicFutureTask(final Runnable runnable, Object result,
155	>	final AtomicInteger runCount) {
156	>	super(new Runnable() {
157	>	public void run() {
158	>	runCount.getAndIncrement();
159	>	runnable.run();
160	>	}}, result);
161	>	this.runCount = runCount;
162	>	}
163	>	PublicFutureTask(Callable callable) {
164	>	this(callable, new AtomicInteger(0));
165	>	}
166	>	private PublicFutureTask(final Callable callable,
167	>	final AtomicInteger runCount) {
168	>	super(new Callable() {
169	>	public Object call() throws Exception {
170	>	runCount.getAndIncrement();
171	>	return callable.call();
172	>	}});
173	>	this.runCount = runCount;
174	>	}
175	>	@Override public void done() {
176	>	assertTrue(isDone());
177	>	doneCount.incrementAndGet();
178	>	super.done();
179	>	}
180	>	@Override public boolean runAndReset() {
181	>	runAndResetCount.incrementAndGet();
182	>	return super.runAndReset();
183	>	}
184	>	@Override public void set(Object x) {
185	>	setCount.incrementAndGet();
186	>	super.set(x);
187	>	}
188	>	@Override public void setException(Throwable t) {
189	>	setExceptionCount.incrementAndGet();
190	>	super.setException(t);
191	>	}
192	>	}
193	>
194	>	class Counter extends CheckedRunnable {
195	>	final AtomicInteger count = new AtomicInteger(0);
196	>	public int get() { return count.get(); }
197	>	public void realRun() {
198	>	count.getAndIncrement();
199	>	}
200	>	}
201	>
202	>	/**
203	>	* creating a future with a null callable throws NullPointerException
204	>	*/
205	>	public void testConstructor() {
206	>	try {
207	>	new FutureTask(null);
208	>	shouldThrow();
209	>	} catch (NullPointerException success) {}
210		}
211
212	+	/**
213	+	* creating a future with null runnable throws NullPointerException
214	+	*/
215	+	public void testConstructor2() {
216	+	try {
217	+	new FutureTask(null, Boolean.TRUE);
218	+	shouldThrow();
219	+	} catch (NullPointerException success) {}
220	+	}
221	+
222	+	/**
223	+	* isDone is true when a task completes
224	+	*/
225	+	public void testIsDone() {
226	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
227	+	assertFalse(task.isDone());
228	+	task.run();
229	+	assertTrue(task.isDone());
230	+	checkCompletedNormally(task, Boolean.TRUE);
231	+	assertEquals(1, task.runCount());
232	+	}
233	+
234	+	/**
235	+	* runAndReset of a non-cancelled task succeeds
236	+	*/
237	+	public void testRunAndReset() {
238	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
239	+	for (int i = 0; i < 3; i++) {
240	+	assertTrue(task.runAndReset());
241	+	checkNotDone(task);
242	+	assertEquals(i+1, task.runCount());
243	+	assertEquals(i+1, task.runAndResetCount());
244	+	assertEquals(0, task.setCount());
245	+	assertEquals(0, task.setExceptionCount());
246	+	}
247	+	}
248	+
249	+	/**
250	+	* runAndReset after cancellation fails
251	+	*/
252	+	public void testRunAndResetAfterCancel() {
253	+	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
254	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
255	+	assertTrue(task.cancel(mayInterruptIfRunning));
256	+	for (int i = 0; i < 3; i++) {
257	+	assertFalse(task.runAndReset());
258	+	assertEquals(0, task.runCount());
259	+	assertEquals(i+1, task.runAndResetCount());
260	+	assertEquals(0, task.setCount());
261	+	assertEquals(0, task.setExceptionCount());
262	+	}
263	+	tryToConfuseDoneTask(task);
264	+	checkCancelled(task);
265	+	}
266	+	}
267	+
268	+	/**
269	+	* setting value causes get to return it
270	+	*/
271	+	public void testSet() throws Exception {
272	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
273	+	task.set(one);
274	+	for (int i = 0; i < 3; i++) {
275	+	assertSame(one, task.get());
276	+	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
277	+	assertEquals(1, task.setCount());
278	+	}
279	+	tryToConfuseDoneTask(task);
280	+	checkCompletedNormally(task, one);
281	+	assertEquals(0, task.runCount());
282	+	}
283	+
284	+	/**
285	+	* setException causes get to throw ExecutionException
286	+	*/
287	+	public void testSetException_get() throws Exception {
288	+	Exception nse = new NoSuchElementException();
289	+	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
290	+	task.setException(nse);
291	+
292	+	try {
293	+	task.get();
294	+	shouldThrow();
295	+	} catch (ExecutionException success) {
296	+	assertSame(nse, success.getCause());
297	+	checkCompletedAbnormally(task, nse);
298	+	}
299	+
300	+	try {
301	+	task.get(LONG_DELAY_MS, MILLISECONDS);
302	+	shouldThrow();
303	+	} catch (ExecutionException success) {
304	+	assertSame(nse, success.getCause());
305	+	checkCompletedAbnormally(task, nse);
306	+	}
307	+
308	+	assertEquals(1, task.setExceptionCount());
309	+	assertEquals(0, task.setCount());
310	+	tryToConfuseDoneTask(task);
311	+	checkCompletedAbnormally(task, nse);
312	+	assertEquals(0, task.runCount());
313	+	}
314	+
315	+	/**
316	+	* cancel(false) before run succeeds
317	+	*/
318		public void testCancelBeforeRun() {
319	<	FutureTask task = new FutureTask( new Callable() {
52	<	public Object call() { return Boolean.TRUE; } });
319	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
320		assertTrue(task.cancel(false));
321	<	task.run();
322	<	assertTrue(task.isDone());
323	<	assertTrue(task.isCancelled());
321	>	task.run();
322	>	assertEquals(0, task.runCount());
323	>	assertEquals(0, task.setCount());
324	>	assertEquals(0, task.setExceptionCount());
325	>	assertTrue(task.isCancelled());
326	>	assertTrue(task.isDone());
327	>	tryToConfuseDoneTask(task);
328	>	assertEquals(0, task.runCount());
329	>	checkCancelled(task);
330		}
331
332	+	/**
333	+	* cancel(true) before run succeeds
334	+	*/
335		public void testCancelBeforeRun2() {
336	<	FutureTask task = new FutureTask( new Callable() {
61	<	public Object call() { return Boolean.TRUE; } });
336	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
337		assertTrue(task.cancel(true));
338	<	task.run();
339	<	assertTrue(task.isDone());
340	<	assertTrue(task.isCancelled());
338	>	task.run();
339	>	assertEquals(0, task.runCount());
340	>	assertEquals(0, task.setCount());
341	>	assertEquals(0, task.setExceptionCount());
342	>	assertTrue(task.isCancelled());
343	>	assertTrue(task.isDone());
344	>	tryToConfuseDoneTask(task);
345	>	assertEquals(0, task.runCount());
346	>	checkCancelled(task);
347		}
348
349	+	/**
350	+	* cancel(false) of a completed task fails
351	+	*/
352		public void testCancelAfterRun() {
353	<	FutureTask task = new FutureTask( new Callable() {
354	<	public Object call() { return Boolean.TRUE; } });
71	<	task.run();
353	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
354	>	task.run();
355		assertFalse(task.cancel(false));
356	<	assertTrue(task.isDone());
357	<	assertFalse(task.isCancelled());
358	<	}
359	<
360	<	public void testCancelInterrupt(){
361	<	FutureTask task = new FutureTask( new Callable() {
362	<	public Object call() {
356	>	assertEquals(1, task.runCount());
357	>	assertEquals(1, task.setCount());
358	>	assertEquals(0, task.setExceptionCount());
359	>	tryToConfuseDoneTask(task);
360	>	checkCompletedNormally(task, Boolean.TRUE);
361	>	assertEquals(1, task.runCount());
362	>	}
363	>
364	>	/**
365	>	* cancel(true) of a completed task fails
366	>	*/
367	>	public void testCancelAfterRun2() {
368	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
369	>	task.run();
370	>	assertFalse(task.cancel(true));
371	>	assertEquals(1, task.runCount());
372	>	assertEquals(1, task.setCount());
373	>	assertEquals(0, task.setExceptionCount());
374	>	tryToConfuseDoneTask(task);
375	>	checkCompletedNormally(task, Boolean.TRUE);
376	>	assertEquals(1, task.runCount());
377	>	}
378	>
379	>	/**
380	>	* cancel(true) interrupts a running task that subsequently succeeds
381	>	*/
382	>	public void testCancelInterrupt() {
383	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
384	>	final PublicFutureTask task =
385	>	new PublicFutureTask(new CheckedRunnable() {
386	>	public void realRun() {
387	>	pleaseCancel.countDown();
388		try {
389	<	Thread.sleep(SHORT_DELAY_MS* 2);
390	<	fail("should throw");
391	<	}
392	<	catch (InterruptedException success) {}
85	<	return Boolean.TRUE;
86	<	} });
87	<	Thread t = new  Thread(task);
88	<	t.start();
89	<
90	<	try{
91	<	Thread.sleep(SHORT_DELAY_MS);
92	<	assertTrue(task.cancel(true));
93	<	t.join();
94	<	assertTrue(task.isDone());
95	<	assertTrue(task.isCancelled());
96	<	} catch(InterruptedException e){
97	<	fail("unexpected exception");
98	<	}
99	<	}
389	>	delay(LONG_DELAY_MS);
390	>	shouldThrow();
391	>	} catch (InterruptedException success) {}
392	>	}});
393
394	+	Thread t = newStartedThread(task);
395	+	await(pleaseCancel);
396	+	assertTrue(task.cancel(true));
397	+	assertTrue(task.isCancelled());
398	+	assertTrue(task.isDone());
399	+	awaitTermination(t);
400	+	assertEquals(1, task.runCount());
401	+	assertEquals(1, task.setCount());
402	+	assertEquals(0, task.setExceptionCount());
403	+	tryToConfuseDoneTask(task);
404	+	checkCancelled(task);
405	+	}
406	+
407	+	/**
408	+	* cancel(true) tries to interrupt a running task, but
409	+	* Thread.interrupt throws (simulating a restrictive security
410	+	* manager)
411	+	*/
412	+	public void testCancelInterrupt_ThrowsSecurityException() {
413	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
414	+	final CountDownLatch cancelled = new CountDownLatch(1);
415	+	final PublicFutureTask task =
416	+	new PublicFutureTask(new CheckedRunnable() {
417	+	public void realRun() {
418	+	pleaseCancel.countDown();
419	+	await(cancelled);
420	+	assertFalse(Thread.interrupted());
421	+	}});
422	+
423	+	final Thread t = new Thread(task) {
424	+	// Simulate a restrictive security manager.
425	+	@Override public void interrupt() {
426	+	throw new SecurityException();
427	+	}};
428	+	t.setDaemon(true);
429	+	t.start();
430
431	<	public void testCancelNoInterrupt(){
432	<	FutureTask task = new FutureTask( new Callable() {
433	<	public Object call() {
431	>	await(pleaseCancel);
432	>	try {
433	>	task.cancel(true);
434	>	shouldThrow();
435	>	} catch (SecurityException expected) {}
436	>
437	>	// We failed to deliver the interrupt, but the world retains
438	>	// its sanity, as if we had done task.cancel(false)
439	>	assertTrue(task.isCancelled());
440	>	assertTrue(task.isDone());
441	>	assertEquals(1, task.runCount());
442	>	assertEquals(1, task.doneCount());
443	>	assertEquals(0, task.setCount());
444	>	assertEquals(0, task.setExceptionCount());
445	>	cancelled.countDown();
446	>	awaitTermination(t);
447	>	assertEquals(1, task.setCount());
448	>	assertEquals(0, task.setExceptionCount());
449	>	tryToConfuseDoneTask(task);
450	>	checkCancelled(task);
451	>	}
452	>
453	>	/**
454	>	* cancel(true) interrupts a running task that subsequently throws
455	>	*/
456	>	public void testCancelInterrupt_taskFails() {
457	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
458	>	final PublicFutureTask task =
459	>	new PublicFutureTask(new Runnable() {
460	>	public void run() {
461		try {
462	<	Thread.sleep(SHORT_DELAY_MS* 2);
463	<	}
464	<	catch (InterruptedException success) {
465	<	fail("should not interrupt");
466	<	}
462	>	pleaseCancel.countDown();
463	>	delay(LONG_DELAY_MS);
464	>	} finally { throw new RuntimeException(); }
465	>	}});
466	>
467	>	Thread t = newStartedThread(task);
468	>	await(pleaseCancel);
469	>	assertTrue(task.cancel(true));
470	>	assertTrue(task.isCancelled());
471	>	awaitTermination(t);
472	>	assertEquals(1, task.runCount());
473	>	assertEquals(0, task.setCount());
474	>	assertEquals(1, task.setExceptionCount());
475	>	tryToConfuseDoneTask(task);
476	>	checkCancelled(task);
477	>	}
478	>
479	>	/**
480	>	* cancel(false) does not interrupt a running task
481	>	*/
482	>	public void testCancelNoInterrupt() {
483	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
484	>	final CountDownLatch cancelled = new CountDownLatch(1);
485	>	final PublicFutureTask task =
486	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
487	>	public Boolean realCall() {
488	>	pleaseCancel.countDown();
489	>	await(cancelled);
490	>	assertFalse(Thread.interrupted());
491		return Boolean.TRUE;
492	<	} });
493	<	Thread t = new  Thread(task);
494	<	t.start();
495	<
496	<	try{
497	<	Thread.sleep(SHORT_DELAY_MS);
498	<	assertTrue(task.cancel(false));
499	<	t.join();
500	<	assertTrue(task.isDone());
501	<	assertTrue(task.isCancelled());
502	<	} catch(InterruptedException e){
503	<	fail("unexpected exception");
492	>	}});
493	>
494	>	Thread t = newStartedThread(task);
495	>	await(pleaseCancel);
496	>	assertTrue(task.cancel(false));
497	>	assertTrue(task.isCancelled());
498	>	cancelled.countDown();
499	>	awaitTermination(t);
500	>	assertEquals(1, task.runCount());
501	>	assertEquals(1, task.setCount());
502	>	assertEquals(0, task.setExceptionCount());
503	>	tryToConfuseDoneTask(task);
504	>	checkCancelled(task);
505	>	}
506	>
507	>	/**
508	>	* run in one thread causes get in another thread to retrieve value
509	>	*/
510	>	public void testGetRun() {
511	>	final CountDownLatch pleaseRun = new CountDownLatch(2);
512	>
513	>	final PublicFutureTask task =
514	>	new PublicFutureTask(new CheckedCallable<Object>() {
515	>	public Object realCall() {
516	>	return two;
517	>	}});
518	>
519	>	Thread t1 = newStartedThread(new CheckedRunnable() {
520	>	public void realRun() throws Exception {
521	>	pleaseRun.countDown();
522	>	assertSame(two, task.get());
523	>	}});
524	>
525	>	Thread t2 = newStartedThread(new CheckedRunnable() {
526	>	public void realRun() throws Exception {
527	>	pleaseRun.countDown();
528	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
529	>	}});
530	>
531	>	await(pleaseRun);
532	>	checkNotDone(task);
533	>	assertTrue(t1.isAlive());
534	>	assertTrue(t2.isAlive());
535	>	task.run();
536	>	checkCompletedNormally(task, two);
537	>	assertEquals(1, task.runCount());
538	>	assertEquals(1, task.setCount());
539	>	assertEquals(0, task.setExceptionCount());
540	>	awaitTermination(t1);
541	>	awaitTermination(t2);
542	>	tryToConfuseDoneTask(task);
543	>	checkCompletedNormally(task, two);
544	>	}
545	>
546	>	/**
547	>	* set in one thread causes get in another thread to retrieve value
548	>	*/
549	>	public void testGetSet() {
550	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
551	>
552	>	final PublicFutureTask task =
553	>	new PublicFutureTask(new CheckedCallable<Object>() {
554	>	public Object realCall() throws InterruptedException {
555	>	return two;
556	>	}});
557	>
558	>	Thread t1 = newStartedThread(new CheckedRunnable() {
559	>	public void realRun() throws Exception {
560	>	pleaseSet.countDown();
561	>	assertSame(two, task.get());
562	>	}});
563	>
564	>	Thread t2 = newStartedThread(new CheckedRunnable() {
565	>	public void realRun() throws Exception {
566	>	pleaseSet.countDown();
567	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
568	>	}});
569	>
570	>	await(pleaseSet);
571	>	checkNotDone(task);
572	>	assertTrue(t1.isAlive());
573	>	assertTrue(t2.isAlive());
574	>	task.set(two);
575	>	assertEquals(0, task.runCount());
576	>	assertEquals(1, task.setCount());
577	>	assertEquals(0, task.setExceptionCount());
578	>	tryToConfuseDoneTask(task);
579	>	checkCompletedNormally(task, two);
580	>	awaitTermination(t1);
581	>	awaitTermination(t2);
582	>	}
583	>
584	>	/**
585	>	* Cancelling a task causes timed get in another thread to throw
586	>	* CancellationException
587	>	*/
588	>	public void testTimedGet_Cancellation() {
589	>	for (final boolean mayInterruptIfRunning :
590	>	new boolean[] { true, false }) {
591	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
592	>	final CountDownLatch cancelled = new CountDownLatch(1);
593	>	final PublicFutureTask task =
594	>	new PublicFutureTask(new CheckedCallable<Object>() {
595	>	public Object realCall() throws InterruptedException {
596	>	pleaseCancel.countDown();
597	>	if (mayInterruptIfRunning) {
598	>	try {
599	>	delay(2*LONG_DELAY_MS);
600	>	} catch (InterruptedException success) {}
601	>	} else {
602	>	await(cancelled);
603	>	}
604	>	return two;
605	>	}});
606	>
607	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
608	>	public void realRun() throws Exception {
609	>	pleaseCancel.countDown();
610	>	task.get();
611	>	}};
612	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
613	>	public void realRun() throws Exception {
614	>	pleaseCancel.countDown();
615	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
616	>	}};
617	>	t1.start();
618	>	t2.start();
619	>	Thread t3 = newStartedThread(task);
620	>	await(pleaseCancel);
621	>	checkIsRunning(task);
622	>	task.cancel(mayInterruptIfRunning);
623	>	checkCancelled(task);
624	>	awaitTermination(t1);
625	>	awaitTermination(t2);
626	>	cancelled.countDown();
627	>	awaitTermination(t3);
628	>	assertEquals(1, task.runCount());
629	>	assertEquals(1, task.setCount());
630	>	assertEquals(0, task.setExceptionCount());
631	>	tryToConfuseDoneTask(task);
632	>	checkCancelled(task);
633		}
634		}
635
636	<	public void testGet1() {
637	<	final FutureTask ft = new FutureTask(new Callable(){
638	<	public Object call(){
639	<	try{
640	<	Thread.sleep(MEDIUM_DELAY_MS);
641	<	} catch(InterruptedException e){
642	<	fail("unexpected exception");
643	<	}
644	<	return Boolean.TRUE;
645	<	}
646	<	});
647	<	Thread t = new Thread(new Runnable(){
648	<	public void run(){
649	<	try{
650	<	ft.get();
651	<	} catch(Exception e){
652	<	fail("unexpected exception");
653	<	}
654	<	}
655	<	});
656	<	try{
657	<	assertFalse(ft.isDone());
149	<	assertFalse(ft.isCancelled());
150	<	t.start();
151	<	Thread.sleep(SHORT_DELAY_MS);
152	<	ft.run();
153	<	t.join();
154	<	assertTrue(ft.isDone());
155	<	assertFalse(ft.isCancelled());
156	<	} catch(InterruptedException e){
157	<	fail("unexpected exception");
158	<
159	<	}
160	<	}
161	<
162	<	public void testTimedGet1() {
163	<	final FutureTask ft = new FutureTask(new Callable(){
164	<	public Object call(){
165	<	try{
166	<	Thread.sleep(MEDIUM_DELAY_MS);
167	<	} catch(InterruptedException e){
168	<	fail("unexpected exception");
169	<	}
170	<	return Boolean.TRUE;
171	<	}
172	<	});
173	<	Thread t = new Thread(new Runnable(){
174	<	public void run(){
175	<	try{
176	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
177	<	} catch(TimeoutException success) {
178	<	} catch(Exception e){
179	<	fail("unexpected exception");
180	<	}
181	<	}
182	<	});
183	<	try{
184	<	assertFalse(ft.isDone());
185	<	assertFalse(ft.isCancelled());
186	<	t.start();
187	<	ft.run();
188	<	t.join();
189	<	assertTrue(ft.isDone());
190	<	assertFalse(ft.isCancelled());
191	<	} catch(InterruptedException e){
192	<	fail("unexpected exception");
193	<
194	<	}
636	>	/**
637	>	* A runtime exception in task causes get to throw ExecutionException
638	>	*/
639	>	public void testGet_ExecutionException() throws InterruptedException {
640	>	final ArithmeticException e = new ArithmeticException();
641	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
642	>	public Object call() {
643	>	throw e;
644	>	}});
645	>
646	>	task.run();
647	>	assertEquals(1, task.runCount());
648	>	assertEquals(0, task.setCount());
649	>	assertEquals(1, task.setExceptionCount());
650	>	try {
651	>	task.get();
652	>	shouldThrow();
653	>	} catch (ExecutionException success) {
654	>	assertSame(e, success.getCause());
655	>	tryToConfuseDoneTask(task);
656	>	checkCompletedAbnormally(task, success.getCause());
657	>	}
658		}
659
660	+	/**
661	+	* A runtime exception in task causes timed get to throw ExecutionException
662	+	*/
663	+	public void testTimedGet_ExecutionException2() throws Exception {
664	+	final ArithmeticException e = new ArithmeticException();
665	+	final PublicFutureTask task = new PublicFutureTask(new Callable() {
666	+	public Object call() {
667	+	throw e;
668	+	}});
669
670	<	public void testGet_Cancellation(){
671	<	final FutureTask ft = new FutureTask(new Callable(){
672	<	public Object call(){
673	<	try{
674	<	Thread.sleep(MEDIUM_DELAY_MS);
675	<	} catch(InterruptedException e){
676	<	fail("unexpected exception");
677	<	}
678	<	return Boolean.TRUE;
679	<	}
680	<	});
681	<	try {
682	<	Thread.sleep(SHORT_DELAY_MS);
683	<	Thread t = new Thread(new Runnable(){
684	<	public void run(){
685	<	try{
686	<	ft.get();
687	<	fail("should throw");
688	<	} catch(CancellationException success){
689	<	}
690	<	catch(Exception e){
691	<	fail("unexpected exception");
692	<	}
693	<	}
694	<	});
695	<	t.start();
696	<	ft.cancel(true);
697	<	t.join();
698	<	} catch(InterruptedException success){
699	<	fail("unexpected exception");
700	<	}
701	<	}
702	<
703	<	public void testGet_Cancellation2(){
704	<	final FutureTask ft = new FutureTask(new Callable(){
705	<	public Object call(){
706	<	try{
707	<	Thread.sleep(SHORT_DELAY_MS);
708	<	} catch(InterruptedException e) {
709	<	fail("unexpected exception");
710	<	}
711	<	return Boolean.TRUE;
712	<	}
713	<	});
714	<	try{
715	<	Thread.sleep(100);
716	<	Thread t = new Thread(new Runnable(){
717	<	public void run(){
718	<	try{
719	<	ft.get(3 * SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
720	<	fail("should throw");
721	<	} catch(CancellationException success) {}
722	<	catch(Exception e){
723	<	fail("unexpected exception");
724	<	}
725	<	}
726	<	});
727	<	t.start();
728	<	Thread.sleep(SHORT_DELAY_MS);
729	<	ft.cancel(true);
730	<	Thread.sleep(SHORT_DELAY_MS);
731	<	t.join();
732	<	} catch(InterruptedException ie){
733	<	fail("unexpected exception");
734	<	}
735	<	}
736	<
737	<	public void testGet_ExecutionException(){
738	<	final FutureTask ft = new FutureTask(new Callable(){
739	<	public Object call(){
740	<	int i = 5/0;
741	<	return Boolean.TRUE;
742	<	}
743	<	});
744	<	try{
745	<	ft.run();
746	<	ft.get();
747	<	fail("should throw");
748	<	} catch(ExecutionException success){
749	<	}
750	<	catch(Exception e){
279	<	fail("unexpected exception");
280	<	}
281	<	}
282	<
283	<	public void testTimedGet_ExecutionException2(){
284	<	final FutureTask ft = new FutureTask(new Callable(){
285	<	public Object call(){
286	<	int i = 5/0;
287	<	return Boolean.TRUE;
288	<	}
289	<	});
290	<	try{
291	<	ft.run();
292	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
293	<	fail("should throw");
294	<	} catch(ExecutionException success) {
295	<	} catch(TimeoutException success) { } // unlikely but OK
296	<	catch(Exception e){
297	<	fail("unexpected exception");
298	<	}
299	<	}
300	<
301	<
302	<	public void testGet_InterruptedException(){
303	<	final FutureTask ft = new FutureTask(new Callable(){
304	<	public Object call(){
305	<	return new Object();
306	<	}
307	<	});
308	<	Thread t = new Thread(new Runnable(){
309	<	public void run(){
310	<	try{
311	<	ft.get();
312	<	fail("should throw");
313	<	} catch(InterruptedException success){
314	<	} catch(Exception e){
315	<	fail("unexpected exception");
316	<	}
317	<	}
318	<	});
319	<	try {
320	<	t.start();
321	<	Thread.sleep(SHORT_DELAY_MS);
322	<	t.interrupt();
323	<	t.join();
324	<	} catch(Exception e){
325	<	fail("unexpected exception");
326	<	}
327	<	}
328	<
329	<	public void testTimedGet_InterruptedException2(){
330	<	final FutureTask ft = new FutureTask(new Callable(){
331	<	public Object call(){
332	<	return new Object();
333	<	}
334	<	});
335	<	Thread t = new Thread(new Runnable(){
336	<	public void run(){
337	<	try{
338	<	ft.get(100,TimeUnit.SECONDS);
339	<	fail("should throw");
340	<	} catch(InterruptedException success){}
341	<	catch(Exception e){
342	<	fail("unexpected exception");
343	<	}
344	<	}
345	<	});
346	<	try {
347	<	t.start();
348	<	Thread.sleep(SHORT_DELAY_MS);
349	<	t.interrupt();
350	<	t.join();
351	<	} catch(Exception e){
352	<	fail("unexpected exception");
353	<	}
354	<	}
355	<
356	<	public void testGet_TimeoutException(){
357	<	FutureTask ft = new FutureTask(new Callable(){
358	<	public Object call(){
359	<	return new Object();
360	<	}
361	<	});
362	<	try{
363	<	ft.get(1,TimeUnit.MILLISECONDS);
364	<	fail("should throw");
365	<	} catch(TimeoutException success){}
366	<	catch(Exception success){
367	<	fail("unexpected exception");
368	<	}
369	<
370	<
670	>	task.run();
671	>	try {
672	>	task.get(LONG_DELAY_MS, MILLISECONDS);
673	>	shouldThrow();
674	>	} catch (ExecutionException success) {
675	>	assertSame(e, success.getCause());
676	>	tryToConfuseDoneTask(task);
677	>	checkCompletedAbnormally(task, success.getCause());
678	>	}
679	>	}
680	>
681	>	/**
682	>	* get is interruptible
683	>	*/
684	>	public void testGet_interruptible() {
685	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
686	>	final FutureTask task = new FutureTask(new NoOpCallable());
687	>	Thread t = newStartedThread(new CheckedRunnable() {
688	>	public void realRun() throws Exception {
689	>	Thread.currentThread().interrupt();
690	>	try {
691	>	task.get();
692	>	shouldThrow();
693	>	} catch (InterruptedException success) {}
694	>	assertFalse(Thread.interrupted());
695	>
696	>	pleaseInterrupt.countDown();
697	>	try {
698	>	task.get();
699	>	shouldThrow();
700	>	} catch (InterruptedException success) {}
701	>	assertFalse(Thread.interrupted());
702	>	}});
703	>
704	>	await(pleaseInterrupt);
705	>	t.interrupt();
706	>	awaitTermination(t);
707	>	checkNotDone(task);
708	>	}
709	>
710	>	/**
711	>	* timed get is interruptible
712	>	*/
713	>	public void testTimedGet_interruptible() {
714	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
715	>	final FutureTask task = new FutureTask(new NoOpCallable());
716	>	Thread t = newStartedThread(new CheckedRunnable() {
717	>	public void realRun() throws Exception {
718	>	Thread.currentThread().interrupt();
719	>	try {
720	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
721	>	shouldThrow();
722	>	} catch (InterruptedException success) {}
723	>	assertFalse(Thread.interrupted());
724	>
725	>	pleaseInterrupt.countDown();
726	>	try {
727	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
728	>	shouldThrow();
729	>	} catch (InterruptedException success) {}
730	>	assertFalse(Thread.interrupted());
731	>	}});
732	>
733	>	await(pleaseInterrupt);
734	>	t.interrupt();
735	>	awaitTermination(t);
736	>	checkNotDone(task);
737	>	}
738	>
739	>	/**
740	>	* A timed out timed get throws TimeoutException
741	>	*/
742	>	public void testGet_TimeoutException() throws Exception {
743	>	FutureTask task = new FutureTask(new NoOpCallable());
744	>	long startTime = System.nanoTime();
745	>	try {
746	>	task.get(timeoutMillis(), MILLISECONDS);
747	>	shouldThrow();
748	>	} catch (TimeoutException success) {
749	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
750	>	}
751		}
752	<
752	>
753	>	/**
754	>	* timed get with null TimeUnit throws NullPointerException
755	>	*/
756	>	public void testGet_NullTimeUnit() throws Exception {
757	>	FutureTask task = new FutureTask(new NoOpCallable());
758	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
759	>
760	>	for (long timeout : timeouts) {
761	>	try {
762	>	task.get(timeout, null);
763	>	shouldThrow();
764	>	} catch (NullPointerException success) {}
765	>	}
766	>
767	>	task.run();
768	>
769	>	for (long timeout : timeouts) {
770	>	try {
771	>	task.get(timeout, null);
772	>	shouldThrow();
773	>	} catch (NullPointerException success) {}
774	>	}
775	>	}
776	>
777		}

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