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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 1.25 by dl, Fri May 6 11:22:07 2011 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 static java.util.concurrent.TimeUnit.MILLISECONDS;
12	+	import static java.util.concurrent.TimeUnit.SECONDS;
13		import java.util.*;
14
15		public class FutureTaskTest extends JSR166TestCase {
16
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(FutureTaskTest.class);
21	>	return new TestSuite(FutureTaskTest.class);
22	>	}
23	>
24	>	void checkNotDone(Future<?> f) {
25	>	assertFalse(f.isDone());
26	>	assertFalse(f.isCancelled());
27	>	}
28	>
29	>	<T> void checkCompletedNormally(Future<T> f, T expected) {
30	>	assertTrue(f.isDone());
31	>	assertFalse(f.isCancelled());
32	>
33	>	try {
34	>	assertSame(expected, f.get());
35	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
36	>	try {
37	>	assertSame(expected, f.get(5L, SECONDS));
38	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
39	>
40	>	assertFalse(f.cancel(false));
41	>	assertFalse(f.cancel(true));
42	>	}
43	>
44	>	void checkCancelled(Future<?> f) {
45	>	assertTrue(f.isDone());
46	>	assertTrue(f.isCancelled());
47	>
48	>	try {
49	>	f.get();
50	>	shouldThrow();
51	>	} catch (CancellationException success) {
52	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
53	>
54	>	try {
55	>	f.get(5L, SECONDS);
56	>	shouldThrow();
57	>	} catch (CancellationException success) {
58	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
59	>
60	>	assertFalse(f.cancel(false));
61	>	assertFalse(f.cancel(true));
62	>	}
63	>
64	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
65	>	assertTrue(f.isDone());
66	>	assertFalse(f.isCancelled());
67	>
68	>	try {
69	>	f.get();
70	>	shouldThrow();
71	>	} catch (ExecutionException success) {
72	>	assertSame(t, success.getCause());
73	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
74	>
75	>	try {
76	>	f.get(5L, SECONDS);
77	>	shouldThrow();
78	>	} catch (ExecutionException success) {
79	>	assertSame(t, success.getCause());
80	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
81	>
82	>	assertFalse(f.cancel(false));
83	>	assertFalse(f.cancel(true));
84		}
85
86		/**
87		* Subclass to expose protected methods
88		*/
89	<	static class MyFutureTask extends FutureTask {
90	<	public MyFutureTask(Callable r) { super(r); }
91	<	public boolean reset() { return super.reset(); }
27	<	public void setCancelled() { super.setCancelled(); }
28	<	public void setDone() { super.setDone(); }
89	>	static class PublicFutureTask extends FutureTask {
90	>	public PublicFutureTask(Callable r) { super(r); }
91	>	public boolean runAndReset() { return super.runAndReset(); }
92		public void set(Object x) { super.set(x); }
93		public void setException(Throwable t) { super.setException(t); }
94		}
95
96	<	public void testConstructor(){
96	>	/**
97	>	* Creating a future with a null callable throws NPE
98	>	*/
99	>	public void testConstructor() {
100		try {
101		FutureTask task = new FutureTask(null);
102	<	fail("should throw");
103	<	}
38	<	catch(NullPointerException success) {
39	<	}
102	>	shouldThrow();
103	>	} catch (NullPointerException success) {}
104		}
105
106	<	public void testConstructor2(){
106	>	/**
107	>	* creating a future with null runnable fails
108	>	*/
109	>	public void testConstructor2() {
110		try {
111		FutureTask task = new FutureTask(null, Boolean.TRUE);
112	<	fail("should throw");
113	<	}
47	<	catch(NullPointerException success) {
48	<	}
112	>	shouldThrow();
113	>	} catch (NullPointerException success) {}
114		}
115
116	<	public void testIsDone(){
117	<	FutureTask task = new FutureTask( new NoOpCallable());
118	<	task.run();
119	<	assertTrue(task.isDone());
120	<	assertFalse(task.isCancelled());
116	>	/**
117	>	* isDone is true when a task completes
118	>	*/
119	>	public void testIsDone() {
120	>	FutureTask task = new FutureTask(new NoOpCallable());
121	>	task.run();
122	>	assertTrue(task.isDone());
123	>	checkCompletedNormally(task, Boolean.TRUE);
124		}
125
126	<	public void testReset(){
127	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
128	<	task.run();
129	<	assertTrue(task.isDone());
130	<	assertTrue(task.reset());
126	>	/**
127	>	* runAndReset of a non-cancelled task succeeds
128	>	*/
129	>	public void testRunAndReset() {
130	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
131	>	assertTrue(task.runAndReset());
132	>	checkNotDone(task);
133		}
134
135	+	/**
136	+	* runAndReset after cancellation fails
137	+	*/
138		public void testResetAfterCancel() {
139	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
139	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
140		assertTrue(task.cancel(false));
141	<	task.run();
142	<	assertTrue(task.isDone());
70	<	assertTrue(task.isCancelled());
71	<	assertFalse(task.reset());
72	<	}
73	<
74	<	public void testSetDone() {
75	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
76	<	task.setDone();
77	<	assertTrue(task.isDone());
78	<	assertFalse(task.isCancelled());
141	>	assertFalse(task.runAndReset());
142	>	checkCancelled(task);
143		}
144
81	–	public void testSetCancelled() {
82	–	MyFutureTask task = new MyFutureTask(new NoOpCallable());
83	–	assertTrue(task.cancel(false));
84	–	task.setCancelled();
85	–	assertTrue(task.isDone());
86	–	assertTrue(task.isCancelled());
87	–	}
145
146	<	public void testSet() {
147	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
146	>	/**
147	>	* setting value causes get to return it
148	>	*/
149	>	public void testSet() throws Exception {
150	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
151		task.set(one);
152	<	try {
153	<	assertEquals(task.get(), one);
94	<	}
95	<	catch(Exception e) {
96	<	fail("unexpected exception");
97	<	}
152	>	assertSame(task.get(), one);
153	>	checkCompletedNormally(task, one);
154		}
155
156	<	public void testSetException() {
156	>	/**
157	>	* setException causes get to throw ExecutionException
158	>	*/
159	>	public void testSetException() throws Exception {
160		Exception nse = new NoSuchElementException();
161	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
161	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
162		task.setException(nse);
163		try {
164		Object x = task.get();
165	<	fail("should throw");
166	<	}
167	<	catch(ExecutionException ee) {
168	<	Throwable cause = ee.getCause();
110	<	assertEquals(cause, nse);
111	<	}
112	<	catch(Exception e) {
113	<	fail("unexpected exception");
165	>	shouldThrow();
166	>	} catch (ExecutionException success) {
167	>	assertSame(success.getCause(), nse);
168	>	checkCompletedAbnormally(task, nse);
169		}
170		}
171
172	+	/**
173	+	* Cancelling before running succeeds
174	+	*/
175		public void testCancelBeforeRun() {
176	<	FutureTask task = new FutureTask( new NoOpCallable());
176	>	FutureTask task = new FutureTask(new NoOpCallable());
177		assertTrue(task.cancel(false));
178	<	task.run();
179	<	assertTrue(task.isDone());
122	<	assertTrue(task.isCancelled());
178	>	task.run();
179	>	checkCancelled(task);
180		}
181
182	+	/**
183	+	* Cancel(true) before run succeeds
184	+	*/
185		public void testCancelBeforeRun2() {
186	<	FutureTask task = new FutureTask( new NoOpCallable());
186	>	FutureTask task = new FutureTask(new NoOpCallable());
187		assertTrue(task.cancel(true));
188	<	task.run();
189	<	assertTrue(task.isDone());
130	<	assertTrue(task.isCancelled());
188	>	task.run();
189	>	checkCancelled(task);
190		}
191
192	+	/**
193	+	* cancel of a completed task fails
194	+	*/
195		public void testCancelAfterRun() {
196	<	FutureTask task = new FutureTask( new NoOpCallable());
197	<	task.run();
196	>	FutureTask task = new FutureTask(new NoOpCallable());
197	>	task.run();
198		assertFalse(task.cancel(false));
199	<	assertTrue(task.isDone());
138	<	assertFalse(task.isCancelled());
199	>	checkCompletedNormally(task, Boolean.TRUE);
200		}
201
202	<	public void testCancelInterrupt(){
203	<	FutureTask task = new FutureTask( new Callable() {
204	<	public Object call() {
205	<	try {
206	<	Thread.sleep(MEDIUM_DELAY_MS);
207	<	threadFail("should throw");
202	>	/**
203	>	* cancel(true) interrupts a running task
204	>	*/
205	>	public void testCancelInterrupt() throws InterruptedException {
206	>	final CountDownLatch threadStarted = new CountDownLatch(1);
207	>	final FutureTask task =
208	>	new FutureTask(new CheckedCallable<Object>() {
209	>	public Object realCall() {
210	>	threadStarted.countDown();
211	>	long t0 = System.nanoTime();
212	>	for (;;) {
213	>	if (Thread.interrupted())
214	>	return Boolean.TRUE;
215	>	if (millisElapsedSince(t0) > MEDIUM_DELAY_MS)
216	>	fail("interrupt not delivered");
217	>	Thread.yield();
218		}
219	<	catch (InterruptedException success) {}
219	>	}});
220	>
221	>	Thread t = newStartedThread(task);
222	>	threadStarted.await();
223	>	assertTrue(task.cancel(true));
224	>	checkCancelled(task);
225	>	awaitTermination(t, MEDIUM_DELAY_MS);
226	>	checkCancelled(task);
227	>	}
228	>
229	>	/**
230	>	* cancel(false) does not interrupt a running task
231	>	*/
232	>	public void testCancelNoInterrupt() throws InterruptedException {
233	>	final CountDownLatch threadStarted = new CountDownLatch(1);
234	>	final CountDownLatch cancelled = new CountDownLatch(1);
235	>	final FutureTask<Boolean> task =
236	>	new FutureTask<Boolean>(new CheckedCallable<Boolean>() {
237	>	public Boolean realCall() throws InterruptedException {
238	>	threadStarted.countDown();
239	>	cancelled.await(MEDIUM_DELAY_MS, MILLISECONDS);
240	>	assertFalse(Thread.interrupted());
241		return Boolean.TRUE;
242	<	} });
243	<	Thread t = new  Thread(task);
244	<	t.start();
245	<
246	<	try{
247	<	Thread.sleep(SHORT_DELAY_MS);
248	<	assertTrue(task.cancel(true));
249	<	t.join();
250	<	assertTrue(task.isDone());
159	<	assertTrue(task.isCancelled());
160	<	} catch(InterruptedException e){
161	<	fail("unexpected exception");
162	<	}
242	>	}});
243	>
244	>	Thread t = newStartedThread(task);
245	>	threadStarted.await();
246	>	assertTrue(task.cancel(false));
247	>	checkCancelled(task);
248	>	cancelled.countDown();
249	>	awaitTermination(t, MEDIUM_DELAY_MS);
250	>	checkCancelled(task);
251		}
252
253	+	/**
254	+	* run in one thread causes get in another thread to retrieve value
255	+	*/
256	+	public void testGetRun() throws InterruptedException {
257	+	final CountDownLatch threadStarted = new CountDownLatch(1);
258
259	<	public void testCancelNoInterrupt(){
260	<	FutureTask task = new FutureTask( new Callable() {
261	<	public Object call() {
169	<	try {
170	<	Thread.sleep(MEDIUM_DELAY_MS);
171	<	}
172	<	catch (InterruptedException success) {
173	<	threadFail("should not interrupt");
174	<	}
259	>	final FutureTask task =
260	>	new FutureTask(new CheckedCallable<Object>() {
261	>	public Object realCall() throws InterruptedException {
262		return Boolean.TRUE;
263	<	} });
264	<	Thread t = new  Thread(task);
265	<	t.start();
266	<
267	<	try{
268	<	Thread.sleep(SHORT_DELAY_MS);
269	<	assertTrue(task.cancel(false));
270	<	t.join();
271	<	assertTrue(task.isDone());
272	<	assertTrue(task.isCancelled());
273	<	} catch(InterruptedException e){
274	<	fail("unexpected exception");
275	<	}
263	>	}});
264	>
265	>	Thread t = newStartedThread(new CheckedRunnable() {
266	>	public void realRun() throws Exception {
267	>	threadStarted.countDown();
268	>	assertSame(Boolean.TRUE, task.get());
269	>	}});
270	>
271	>	threadStarted.await();
272	>	checkNotDone(task);
273	>	assertTrue(t.isAlive());
274	>	task.run();
275	>	checkCompletedNormally(task, Boolean.TRUE);
276	>	awaitTermination(t, MEDIUM_DELAY_MS);
277		}
278
279	<	public void testGet1() {
280	<	final FutureTask ft = new FutureTask(new Callable(){
281	<	public Object call(){
282	<	try{
283	<	Thread.sleep(MEDIUM_DELAY_MS);
284	<	} catch(InterruptedException e){
285	<	threadFail("unexpected exception");
286	<	}
279	>	/**
280	>	* set in one thread causes get in another thread to retrieve value
281	>	*/
282	>	public void testGetSet() throws InterruptedException {
283	>	final CountDownLatch threadStarted = new CountDownLatch(1);
284	>
285	>	final PublicFutureTask task =
286	>	new PublicFutureTask(new CheckedCallable<Object>() {
287	>	public Object realCall() throws InterruptedException {
288		return Boolean.TRUE;
289	<	}
290	<	});
291	<	Thread t = new Thread(new Runnable(){
292	<	public void run(){
293	<	try{
294	<	ft.get();
295	<	} catch(Exception e){
296	<	threadFail("unexpected exception");
297	<	}
298	<	}
299	<	});
300	<	try{
301	<	assertFalse(ft.isDone());
302	<	assertFalse(ft.isCancelled());
303	<	t.start();
304	<	Thread.sleep(SHORT_DELAY_MS);
305	<	ft.run();
306	<	t.join();
307	<	assertTrue(ft.isDone());
308	<	assertFalse(ft.isCancelled());
309	<	} catch(InterruptedException e){
310	<	fail("unexpected exception");
311	<
312	<	}
313	<	}
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	<	}
289	>	}});
290	>
291	>	Thread t = newStartedThread(new CheckedRunnable() {
292	>	public void realRun() throws Exception {
293	>	threadStarted.countDown();
294	>	assertSame(Boolean.FALSE, task.get());
295	>	}});
296	>
297	>	threadStarted.await();
298	>	checkNotDone(task);
299	>	assertTrue(t.isAlive());
300	>	task.set(Boolean.FALSE);
301	>	checkCompletedNormally(task, Boolean.FALSE);
302	>	awaitTermination(t, MEDIUM_DELAY_MS);
303	>	}
304	>
305	>	/**
306	>	* run in one thread causes timed get in another thread to retrieve value
307	>	*/
308	>	public void testTimedGetRun() throws InterruptedException {
309	>	final CountDownLatch threadStarted = new CountDownLatch(1);
310	>
311	>	final FutureTask task =
312	>	new FutureTask(new CheckedCallable<Object>() {
313	>	public Object realCall() throws InterruptedException {
314		return Boolean.TRUE;
315	<	}
316	<	});
317	<	Thread t = new Thread(new Runnable(){
318	<	public void run(){
319	<	try{
320	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
321	<	} catch(TimeoutException success) {
322	<	} catch(Exception e){
323	<	threadFail("unexpected exception");
324	<	}
325	<	}
326	<	});
327	<	try{
328	<	assertFalse(ft.isDone());
329	<	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	<	}
315	>	}});
316	>
317	>	Thread t = newStartedThread(new CheckedRunnable() {
318	>	public void realRun() throws Exception {
319	>	threadStarted.countDown();
320	>	assertSame(Boolean.TRUE,
321	>	task.get(MEDIUM_DELAY_MS, MILLISECONDS));
322	>	}});
323	>
324	>	threadStarted.await();
325	>	checkNotDone(task);
326	>	assertTrue(t.isAlive());
327	>	task.run();
328	>	checkCompletedNormally(task, Boolean.TRUE);
329	>	awaitTermination(t, MEDIUM_DELAY_MS);
330		}
331
332	+	/**
333	+	* set in one thread causes timed get in another thread to retrieve value
334	+	*/
335	+	public void testTimedGetSet() throws InterruptedException {
336	+	final CountDownLatch threadStarted = new CountDownLatch(1);
337
338	<	public void testGet_Cancellation(){
339	<	final FutureTask ft = new FutureTask(new Callable(){
340	<	public Object call(){
265	<	try{
266	<	Thread.sleep(MEDIUM_DELAY_MS);
267	<	} catch(InterruptedException e){
268	<	threadFail("unexpected exception");
269	<	}
338	>	final PublicFutureTask task =
339	>	new PublicFutureTask(new CheckedCallable<Object>() {
340	>	public Object realCall() throws InterruptedException {
341		return Boolean.TRUE;
342	<	}
343	<	});
344	<	try {
345	<	Thread.sleep(SHORT_DELAY_MS);
346	<	Thread t = new Thread(new Runnable(){
347	<	public void run(){
348	<	try{
349	<	ft.get();
350	<	threadFail("should throw");
351	<	} catch(CancellationException success){
352	<	}
353	<	catch(Exception e){
354	<	threadFail("unexpected exception");
355	<	}
356	<	}
286	<	});
287	<	t.start();
288	<	ft.cancel(true);
289	<	t.join();
290	<	} catch(InterruptedException success){
291	<	fail("unexpected exception");
292	<	}
342	>	}});
343	>
344	>	Thread t = newStartedThread(new CheckedRunnable() {
345	>	public void realRun() throws Exception {
346	>	threadStarted.countDown();
347	>	assertSame(Boolean.FALSE,
348	>	task.get(MEDIUM_DELAY_MS, MILLISECONDS));
349	>	}});
350	>
351	>	threadStarted.await();
352	>	checkNotDone(task);
353	>	assertTrue(t.isAlive());
354	>	task.set(Boolean.FALSE);
355	>	checkCompletedNormally(task, Boolean.FALSE);
356	>	awaitTermination(t, MEDIUM_DELAY_MS);
357		}
358	<
359	<	public void testGet_Cancellation2(){
360	<	final FutureTask ft = new FutureTask(new Callable(){
361	<	public Object call(){
362	<	try{
363	<	Thread.sleep(SHORT_DELAY_MS);
364	<	} catch(InterruptedException e) {
365	<	threadFail("unexpected exception");
366	<	}
367	<	return Boolean.TRUE;
368	<	}
369	<	});
370	<	try{
371	<	Thread.sleep(SHORT_DELAY_MS);
372	<	Thread t = new Thread(new Runnable(){
373	<	public void run(){
374	<	try{
375	<	ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
376	<	threadFail("should throw");
377	<	} catch(CancellationException success) {}
378	<	catch(Exception e){
379	<	threadFail("unexpected exception");
380	<	}
381	<	}
382	<	});
383	<	t.start();
384	<	Thread.sleep(SHORT_DELAY_MS);
385	<	ft.cancel(true);
322	<	Thread.sleep(SHORT_DELAY_MS);
323	<	t.join();
324	<	} catch(InterruptedException ie){
325	<	fail("unexpected exception");
326	<	}
358	>
359	>	/**
360	>	* Cancelling a task causes timed get in another thread to throw
361	>	* CancellationException
362	>	*/
363	>	public void testTimedGet_Cancellation() throws InterruptedException {
364	>	final CountDownLatch threadStarted = new CountDownLatch(2);
365	>	final FutureTask task =
366	>	new FutureTask(new CheckedInterruptedCallable<Object>() {
367	>	public Object realCall() throws InterruptedException {
368	>	threadStarted.countDown();
369	>	delay(LONG_DELAY_MS);
370	>	return Boolean.TRUE;
371	>	}});
372	>
373	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
374	>	public void realRun() throws Exception {
375	>	threadStarted.countDown();
376	>	task.get(MEDIUM_DELAY_MS, MILLISECONDS);
377	>	}};
378	>	Thread t2 = new Thread(task);
379	>	t1.start();
380	>	t2.start();
381	>	threadStarted.await();
382	>	task.cancel(true);
383	>	awaitTermination(t1, MEDIUM_DELAY_MS);
384	>	awaitTermination(t2, MEDIUM_DELAY_MS);
385	>	checkCancelled(task);
386		}
387
388	<	public void testGet_ExecutionException(){
389	<	final FutureTask ft = new FutureTask(new Callable(){
390	<	public Object call(){
391	<	int i = 5/0;
392	<	return Boolean.TRUE;
393	<	}
394	<	});
395	<	try{
396	<	ft.run();
397	<	ft.get();
398	<	fail("should throw");
399	<	} catch(ExecutionException success){
400	<	}
401	<	catch(Exception e){
402	<	fail("unexpected exception");
403	<	}
404	<	}
405	<
406	<	public void testTimedGet_ExecutionException2(){
407	<	final FutureTask ft = new FutureTask(new Callable(){
408	<	public Object call(){
409	<	int i = 5/0;
410	<	return Boolean.TRUE;
411	<	}
412	<	});
413	<	try{
414	<	ft.run();
415	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
416	<	fail("should throw");
417	<	} catch(ExecutionException success) {
418	<	} catch(TimeoutException success) { } // unlikely but OK
419	<	catch(Exception e){
420	<	fail("unexpected exception");
421	<	}
422	<	}
423	<
424	<
425	<	public void testGet_InterruptedException(){
426	<	final FutureTask ft = new FutureTask(new NoOpCallable());
427	<	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	<	});
388	>	/**
389	>	* Cancelling a task causes get in another thread to throw
390	>	* CancellationException
391	>	*/
392	>	public void testGet_Cancellation() throws InterruptedException {
393	>	final CountDownLatch threadStarted = new CountDownLatch(2);
394	>	final FutureTask task =
395	>	new FutureTask(new CheckedInterruptedCallable<Object>() {
396	>	public Object realCall() throws InterruptedException {
397	>	threadStarted.countDown();
398	>	delay(LONG_DELAY_MS);
399	>	return Boolean.TRUE;
400	>	}});
401	>
402	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
403	>	public void realRun() throws Exception {
404	>	threadStarted.countDown();
405	>	task.get();
406	>	}};
407	>	Thread t2 = new Thread(task);
408	>	t1.start();
409	>	t2.start();
410	>	threadStarted.await();
411	>	task.cancel(true);
412	>	awaitTermination(t1, MEDIUM_DELAY_MS);
413	>	awaitTermination(t2, MEDIUM_DELAY_MS);
414	>	checkCancelled(task);
415	>	}
416	>
417	>
418	>	/**
419	>	* A runtime exception in task causes get to throw ExecutionException
420	>	*/
421	>	public void testGet_ExecutionException() throws InterruptedException {
422	>	final FutureTask task = new FutureTask(new Callable() {
423	>	public Object call() {
424	>	return 5/0;
425	>	}});
426	>
427	>	task.run();
428		try {
429	<	t.start();
430	<	Thread.sleep(SHORT_DELAY_MS);
431	<	t.interrupt();
432	<	t.join();
433	<	} catch(Exception e){
385	<	fail("unexpected exception");
429	>	task.get();
430	>	shouldThrow();
431	>	} catch (ExecutionException success) {
432	>	assertTrue(success.getCause() instanceof ArithmeticException);
433	>	checkCompletedAbnormally(task, success.getCause());
434		}
435		}
436
437	<	public void testTimedGet_InterruptedException2(){
438	<	final FutureTask ft = new FutureTask(new NoOpCallable());
439	<	Thread t = new Thread(new Runnable(){
440	<	public void run(){
441	<	try{
442	<	ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
443	<	threadFail("should throw");
444	<	} catch(InterruptedException success){}
445	<	catch(Exception e){
446	<	threadFail("unexpected exception");
447	<	}
448	<	}
449	<	});
450	<	try {
451	<	t.start();
452	<	Thread.sleep(SHORT_DELAY_MS);
405	<	t.interrupt();
406	<	t.join();
407	<	} catch(Exception e){
408	<	fail("unexpected exception");
437	>	/**
438	>	* A runtime exception in task causes timed get to throw ExecutionException
439	>	*/
440	>	public void testTimedGet_ExecutionException2() throws Exception {
441	>	final FutureTask task = new FutureTask(new Callable() {
442	>	public Object call() {
443	>	return 5/0;
444	>	}});
445	>
446	>	task.run();
447	>	try {
448	>	task.get(SHORT_DELAY_MS, MILLISECONDS);
449	>	shouldThrow();
450	>	} catch (ExecutionException success) {
451	>	assertTrue(success.getCause() instanceof ArithmeticException);
452	>	checkCompletedAbnormally(task, success.getCause());
453		}
454		}
455	<
456	<	public void testGet_TimeoutException(){
457	<	try{
458	<	FutureTask ft = new FutureTask(new NoOpCallable());
459	<	ft.get(1,TimeUnit.MILLISECONDS);
460	<	fail("should throw");
461	<	} catch(TimeoutException success){}
462	<	catch(Exception success){
463	<	fail("unexpected exception");
464	<	}
455	>
456	>
457	>	/**
458	>	* Interrupting a waiting get causes it to throw InterruptedException
459	>	*/
460	>	public void testGet_InterruptedException() throws InterruptedException {
461	>	final CountDownLatch threadStarted = new CountDownLatch(1);
462	>	final FutureTask task = new FutureTask(new NoOpCallable());
463	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
464	>	public void realRun() throws Exception {
465	>	threadStarted.countDown();
466	>	task.get();
467	>	}});
468	>
469	>	threadStarted.await();
470	>	t.interrupt();
471	>	awaitTermination(t, MEDIUM_DELAY_MS);
472	>	checkNotDone(task);
473		}
474	<
474	>
475	>	/**
476	>	* Interrupting a waiting timed get causes it to throw InterruptedException
477	>	*/
478	>	public void testTimedGet_InterruptedException2() throws InterruptedException {
479	>	final CountDownLatch threadStarted = new CountDownLatch(1);
480	>	final FutureTask task = new FutureTask(new NoOpCallable());
481	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
482	>	public void realRun() throws Exception {
483	>	threadStarted.countDown();
484	>	task.get(LONG_DELAY_MS, MILLISECONDS);
485	>	}});
486	>
487	>	threadStarted.await();
488	>	t.interrupt();
489	>	awaitTermination(t, MEDIUM_DELAY_MS);
490	>	checkNotDone(task);
491	>	}
492	>
493	>	/**
494	>	* A timed out timed get throws TimeoutException
495	>	*/
496	>	public void testGet_TimeoutException() throws Exception {
497	>	try {
498	>	FutureTask task = new FutureTask(new NoOpCallable());
499	>	task.get(1, MILLISECONDS);
500	>	shouldThrow();
501	>	} catch (TimeoutException success) {}
502	>	}
503	>
504		}

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