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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 1.32 by jsr166, Sun Dec 16 18:52:27 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.security.Permission;
11	>	import java.util.concurrent.Callable;
12	>	import java.util.concurrent.CancellationException;
13	>	import java.util.concurrent.CountDownLatch;
14	>	import java.util.concurrent.ExecutionException;
15	>	import java.util.concurrent.Future;
16	>	import java.util.concurrent.FutureTask;
17	>	import java.util.concurrent.TimeoutException;
18	>	import java.util.concurrent.atomic.AtomicInteger;
19	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
20	>	import static java.util.concurrent.TimeUnit.SECONDS;
21		import java.util.*;
22
23		public class FutureTaskTest extends JSR166TestCase {
24
25		public static void main(String[] args) {
26	<	junit.textui.TestRunner.run (suite());
26	>	junit.textui.TestRunner.run(suite());
27		}
28		public static Test suite() {
29	<	return new TestSuite(FutureTaskTest.class);
29	>	return new TestSuite(FutureTaskTest.class);
30		}
31
32	<	/**
33	<	* Subclass to expose protected methods
34	<	*/
35	<	static class MyFutureTask extends FutureTask {
36	<	public MyFutureTask(Callable r) { super(r); }
37	<	public boolean reset() { return super.reset(); }
38	<	public void setCancelled() { super.setCancelled(); }
39	<	public void setDone() { super.setDone(); }
40	<	public void set(Object x) { super.set(x); }
41	<	public void setException(Throwable t) { super.setException(t); }
32	>	void checkIsDone(Future<?> f) {
33	>	assertTrue(f.isDone());
34	>	assertFalse(f.cancel(false));
35	>	assertFalse(f.cancel(true));
36	>	if (f instanceof PublicFutureTask) {
37	>	PublicFutureTask pf = (PublicFutureTask) f;
38	>	assertEquals(1, pf.doneCount());
39	>	assertFalse(pf.runAndReset());
40	>	assertEquals(1, pf.doneCount());
41	>
42	>	// Check that run and runAndReset have no effect.
43	>	int savedRunCount = pf.runCount();
44	>	int savedSetCount = pf.setCount();
45	>	int savedSetExceptionCount = pf.setExceptionCount();
46	>	pf.run();
47	>	pf.runAndReset();
48	>	assertEquals(savedRunCount, pf.runCount());
49	>	assertEquals(savedSetCount, pf.setCount());
50	>	assertEquals(savedSetExceptionCount, pf.setExceptionCount());
51	>	assertTrue(f.isDone());
52	>	}
53		}
54
55	<	public void testConstructor(){
56	<	try {
57	<	FutureTask task = new FutureTask(null);
58	<	fail("should throw");
55	>	void checkNotDone(Future<?> f) {
56	>	assertFalse(f.isDone());
57	>	assertFalse(f.isCancelled());
58	>	if (f instanceof PublicFutureTask) {
59	>	PublicFutureTask pf = (PublicFutureTask) f;
60	>	assertEquals(0, pf.doneCount());
61	>	assertEquals(0, pf.setCount());
62	>	assertEquals(0, pf.setExceptionCount());
63		}
64	<	catch(NullPointerException success) {
64	>	}
65	>
66	>	void checkIsRunning(Future<?> f) {
67	>	checkNotDone(f);
68	>	if (f instanceof FutureTask) {
69	>	FutureTask ft = (FutureTask<?>) f;
70	>	// Check that run methods do nothing
71	>	ft.run();
72	>	if (f instanceof PublicFutureTask)
73	>	assertFalse(((PublicFutureTask) f).runAndReset());
74	>	checkNotDone(f);
75		}
76		}
77
78	<	public void testConstructor2(){
78	>	<T> void checkCompletedNormally(Future<T> f, T expected) {
79	>	checkIsDone(f);
80	>	assertFalse(f.isCancelled());
81	>
82		try {
83	<	FutureTask task = new FutureTask(null, Boolean.TRUE);
84	<	fail("should throw");
85	<	}
86	<	catch(NullPointerException success) {
87	<	}
83	>	assertSame(expected, f.get());
84	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
85	>	try {
86	>	assertSame(expected, f.get(5L, SECONDS));
87	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
88		}
89
90	<	public void testIsDone(){
91	<	FutureTask task = new FutureTask( new NoOpCallable());
92	<	task.run();
93	<	assertTrue(task.isDone());
94	<	assertFalse(task.isCancelled());
90	>	void checkCancelled(Future<?> f) {
91	>	checkIsDone(f);
92	>	assertTrue(f.isCancelled());
93	>
94	>	try {
95	>	f.get();
96	>	shouldThrow();
97	>	} catch (CancellationException success) {
98	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
99	>
100	>	try {
101	>	f.get(5L, SECONDS);
102	>	shouldThrow();
103	>	} catch (CancellationException success) {
104	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
105		}
106
107	<	public void testReset(){
108	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
109	<	task.run();
110	<	assertTrue(task.isDone());
111	<	assertTrue(task.reset());
107	>	void tryToConfuseDoneTask(PublicFutureTask pf) {
108	>	pf.set(new Object());
109	>	pf.setException(new Error());
110	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
111	>	pf.cancel(true);
112	>	}
113		}
114
115	<	public void testResetAfterCancel() {
116	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
117	<	assertTrue(task.cancel(false));
118	<	task.run();
119	<	assertTrue(task.isDone());
120	<	assertTrue(task.isCancelled());
121	<	assertFalse(task.reset());
115	>	void checkCompletedAbnormally(Future<?> f, Throwable t) {
116	>	checkIsDone(f);
117	>	assertFalse(f.isCancelled());
118	>
119	>	try {
120	>	f.get();
121	>	shouldThrow();
122	>	} catch (ExecutionException success) {
123	>	assertSame(t, success.getCause());
124	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
125	>
126	>	try {
127	>	f.get(5L, SECONDS);
128	>	shouldThrow();
129	>	} catch (ExecutionException success) {
130	>	assertSame(t, success.getCause());
131	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
132		}
133
134	<	public void testSetDone() {
135	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
136	<	task.setDone();
137	<	assertTrue(task.isDone());
138	<	assertFalse(task.isCancelled());
134	>	/**
135	>	* Subclass to expose protected methods
136	>	*/
137	>	static class PublicFutureTask extends FutureTask {
138	>	private final AtomicInteger runCount;
139	>	private final AtomicInteger doneCount = new AtomicInteger(0);
140	>	private final AtomicInteger runAndResetCount = new AtomicInteger(0);
141	>	private final AtomicInteger setCount = new AtomicInteger(0);
142	>	private final AtomicInteger setExceptionCount = new AtomicInteger(0);
143	>	public int runCount() { return runCount.get(); }
144	>	public int doneCount() { return doneCount.get(); }
145	>	public int runAndResetCount() { return runAndResetCount.get(); }
146	>	public int setCount() { return setCount.get(); }
147	>	public int setExceptionCount() { return setExceptionCount.get(); }
148	>
149	>	PublicFutureTask(Runnable runnable) {
150	>	this(runnable, seven);
151	>	}
152	>	PublicFutureTask(Runnable runnable, Object result) {
153	>	this(runnable, result, new AtomicInteger(0));
154	>	}
155	>	private PublicFutureTask(final Runnable runnable, Object result,
156	>	final AtomicInteger runCount) {
157	>	super(new Runnable() {
158	>	public void run() {
159	>	runCount.getAndIncrement();
160	>	runnable.run();
161	>	}}, result);
162	>	this.runCount = runCount;
163	>	}
164	>	PublicFutureTask(Callable callable) {
165	>	this(callable, new AtomicInteger(0));
166	>	}
167	>	private PublicFutureTask(final Callable callable,
168	>	final AtomicInteger runCount) {
169	>	super(new Callable() {
170	>	public Object call() throws Exception {
171	>	runCount.getAndIncrement();
172	>	return callable.call();
173	>	}});
174	>	this.runCount = runCount;
175	>	}
176	>	@Override public void done() {
177	>	assertTrue(isDone());
178	>	doneCount.incrementAndGet();
179	>	super.done();
180	>	}
181	>	@Override public boolean runAndReset() {
182	>	runAndResetCount.incrementAndGet();
183	>	return super.runAndReset();
184	>	}
185	>	@Override public void set(Object x) {
186	>	setCount.incrementAndGet();
187	>	super.set(x);
188	>	}
189	>	@Override public void setException(Throwable t) {
190	>	setExceptionCount.incrementAndGet();
191	>	super.setException(t);
192	>	}
193		}
194
195	<	public void testSetCancelled() {
196	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
197	<	assertTrue(task.cancel(false));
198	<	task.setCancelled();
199	<	assertTrue(task.isDone());
200	<	assertTrue(task.isCancelled());
195	>	class Counter extends CheckedRunnable {
196	>	final AtomicInteger count = new AtomicInteger(0);
197	>	public int get() { return count.get(); }
198	>	public void realRun() {
199	>	count.getAndIncrement();
200	>	}
201		}
202
203	<	public void testSet() {
204	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
205	<	task.set(one);
203	>	/**
204	>	* creating a future with a null callable throws NullPointerException
205	>	*/
206	>	public void testConstructor() {
207	>	try {
208	>	new FutureTask(null);
209	>	shouldThrow();
210	>	} catch (NullPointerException success) {}
211	>	}
212	>
213	>	/**
214	>	* creating a future with null runnable throws NullPointerException
215	>	*/
216	>	public void testConstructor2() {
217		try {
218	<	assertEquals(task.get(), one);
218	>	new FutureTask(null, Boolean.TRUE);
219	>	shouldThrow();
220	>	} catch (NullPointerException success) {}
221	>	}
222	>
223	>	/**
224	>	* isDone is true when a task completes
225	>	*/
226	>	public void testIsDone() {
227	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
228	>	assertFalse(task.isDone());
229	>	task.run();
230	>	assertTrue(task.isDone());
231	>	checkCompletedNormally(task, Boolean.TRUE);
232	>	assertEquals(1, task.runCount());
233	>	}
234	>
235	>	/**
236	>	* runAndReset of a non-cancelled task succeeds
237	>	*/
238	>	public void testRunAndReset() {
239	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
240	>	for (int i = 0; i < 3; i++) {
241	>	assertTrue(task.runAndReset());
242	>	checkNotDone(task);
243	>	assertEquals(i+1, task.runCount());
244	>	assertEquals(i+1, task.runAndResetCount());
245	>	assertEquals(0, task.setCount());
246	>	assertEquals(0, task.setExceptionCount());
247		}
248	<	catch(Exception e) {
249	<	fail("unexpected exception");
248	>	}
249	>
250	>	/**
251	>	* runAndReset after cancellation fails
252	>	*/
253	>	public void testRunAndResetAfterCancel() {
254	>	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
255	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
256	>	assertTrue(task.cancel(mayInterruptIfRunning));
257	>	for (int i = 0; i < 3; i++) {
258	>	assertFalse(task.runAndReset());
259	>	assertEquals(0, task.runCount());
260	>	assertEquals(i+1, task.runAndResetCount());
261	>	assertEquals(0, task.setCount());
262	>	assertEquals(0, task.setExceptionCount());
263	>	}
264	>	tryToConfuseDoneTask(task);
265	>	checkCancelled(task);
266		}
267		}
268
269	<	public void testSetException() {
269	>	/**
270	>	* setting value causes get to return it
271	>	*/
272	>	public void testSet() throws Exception {
273	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
274	>	task.set(one);
275	>	for (int i = 0; i < 3; i++) {
276	>	assertSame(one, task.get());
277	>	assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS));
278	>	assertEquals(1, task.setCount());
279	>	}
280	>	tryToConfuseDoneTask(task);
281	>	checkCompletedNormally(task, one);
282	>	assertEquals(0, task.runCount());
283	>	}
284	>
285	>	/**
286	>	* setException causes get to throw ExecutionException
287	>	*/
288	>	public void testSetException_get() throws Exception {
289		Exception nse = new NoSuchElementException();
290	<	MyFutureTask task = new MyFutureTask(new NoOpCallable());
290	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
291		task.setException(nse);
292	+
293		try {
294	<	Object x = task.get();
295	<	fail("should throw");
294	>	task.get();
295	>	shouldThrow();
296	>	} catch (ExecutionException success) {
297	>	assertSame(nse, success.getCause());
298	>	checkCompletedAbnormally(task, nse);
299		}
300	<	catch(ExecutionException ee) {
301	<	Throwable cause = ee.getCause();
302	<	assertEquals(cause, nse);
303	<	}
304	<	catch(Exception e) {
305	<	fail("unexpected exception");
300	>
301	>	try {
302	>	task.get(LONG_DELAY_MS, MILLISECONDS);
303	>	shouldThrow();
304	>	} catch (ExecutionException success) {
305	>	assertSame(nse, success.getCause());
306	>	checkCompletedAbnormally(task, nse);
307		}
308	+
309	+	assertEquals(1, task.setExceptionCount());
310	+	assertEquals(0, task.setCount());
311	+	tryToConfuseDoneTask(task);
312	+	checkCompletedAbnormally(task, nse);
313	+	assertEquals(0, task.runCount());
314		}
315
316	+	/**
317	+	* cancel(false) before run succeeds
318	+	*/
319		public void testCancelBeforeRun() {
320	<	FutureTask task = new FutureTask( new NoOpCallable());
320	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
321		assertTrue(task.cancel(false));
322	<	task.run();
323	<	assertTrue(task.isDone());
324	<	assertTrue(task.isCancelled());
322	>	task.run();
323	>	assertEquals(0, task.runCount());
324	>	assertEquals(0, task.setCount());
325	>	assertEquals(0, task.setExceptionCount());
326	>	assertTrue(task.isCancelled());
327	>	assertTrue(task.isDone());
328	>	tryToConfuseDoneTask(task);
329	>	assertEquals(0, task.runCount());
330	>	checkCancelled(task);
331		}
332
333	+	/**
334	+	* cancel(true) before run succeeds
335	+	*/
336		public void testCancelBeforeRun2() {
337	<	FutureTask task = new FutureTask( new NoOpCallable());
337	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
338		assertTrue(task.cancel(true));
339	<	task.run();
340	<	assertTrue(task.isDone());
341	<	assertTrue(task.isCancelled());
339	>	task.run();
340	>	assertEquals(0, task.runCount());
341	>	assertEquals(0, task.setCount());
342	>	assertEquals(0, task.setExceptionCount());
343	>	assertTrue(task.isCancelled());
344	>	assertTrue(task.isDone());
345	>	tryToConfuseDoneTask(task);
346	>	assertEquals(0, task.runCount());
347	>	checkCancelled(task);
348		}
349
350	+	/**
351	+	* cancel(false) of a completed task fails
352	+	*/
353		public void testCancelAfterRun() {
354	<	FutureTask task = new FutureTask( new NoOpCallable());
355	<	task.run();
354	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
355	>	task.run();
356		assertFalse(task.cancel(false));
357	<	assertTrue(task.isDone());
358	<	assertFalse(task.isCancelled());
357	>	assertEquals(1, task.runCount());
358	>	assertEquals(1, task.setCount());
359	>	assertEquals(0, task.setExceptionCount());
360	>	tryToConfuseDoneTask(task);
361	>	checkCompletedNormally(task, Boolean.TRUE);
362	>	assertEquals(1, task.runCount());
363	>	}
364	>
365	>	/**
366	>	* cancel(true) of a completed task fails
367	>	*/
368	>	public void testCancelAfterRun2() {
369	>	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
370	>	task.run();
371	>	assertFalse(task.cancel(true));
372	>	assertEquals(1, task.runCount());
373	>	assertEquals(1, task.setCount());
374	>	assertEquals(0, task.setExceptionCount());
375	>	tryToConfuseDoneTask(task);
376	>	checkCompletedNormally(task, Boolean.TRUE);
377	>	assertEquals(1, task.runCount());
378		}
379
380	<	public void testCancelInterrupt(){
381	<	FutureTask task = new FutureTask( new Callable() {
382	<	public Object call() {
380	>	/**
381	>	* cancel(true) interrupts a running task that subsequently succeeds
382	>	*/
383	>	public void testCancelInterrupt() {
384	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
385	>	final PublicFutureTask task =
386	>	new PublicFutureTask(new CheckedRunnable() {
387	>	public void realRun() {
388	>	pleaseCancel.countDown();
389		try {
390	<	Thread.sleep(MEDIUM_DELAY_MS);
391	<	threadFail("should throw");
392	<	}
393	<	catch (InterruptedException success) {}
394	<	return Boolean.TRUE;
395	<	} });
396	<	Thread t = new  Thread(task);
397	<	t.start();
398	<
399	<	try{
400	<	Thread.sleep(SHORT_DELAY_MS);
401	<	assertTrue(task.cancel(true));
402	<	t.join();
403	<	assertTrue(task.isDone());
404	<	assertTrue(task.isCancelled());
405	<	} catch(InterruptedException e){
161	<	fail("unexpected exception");
162	<	}
390	>	delay(LONG_DELAY_MS);
391	>	shouldThrow();
392	>	} catch (InterruptedException success) {}
393	>	}});
394	>
395	>	Thread t = newStartedThread(task);
396	>	await(pleaseCancel);
397	>	assertTrue(task.cancel(true));
398	>	assertTrue(task.isCancelled());
399	>	assertTrue(task.isDone());
400	>	awaitTermination(t);
401	>	assertEquals(1, task.runCount());
402	>	assertEquals(1, task.setCount());
403	>	assertEquals(0, task.setExceptionCount());
404	>	tryToConfuseDoneTask(task);
405	>	checkCancelled(task);
406		}
407
408	+	/**
409	+	* cancel(true) interrupts a running task that subsequently
410	+	* succeeds, with a security manager that does not permit
411	+	* Thread.interrupt
412	+	*/
413	+	public void testCancelInterrupt_ThrowsSecurityException() {
414	+	if (System.getSecurityManager() != null)
415	+	return;
416	+
417	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
418	+	final CountDownLatch cancelled = new CountDownLatch(1);
419	+	final PublicFutureTask task =
420	+	new PublicFutureTask(new CheckedRunnable() {
421	+	public void realRun() {
422	+	pleaseCancel.countDown();
423	+	await(cancelled);
424	+	assertFalse(Thread.interrupted());
425	+	}});
426	+
427	+	final Thread t = newStartedThread(task);
428	+	await(pleaseCancel);
429	+	System.setSecurityManager(new SecurityManager() {
430	+	public void checkAccess(Thread t) { throw new SecurityException(); }
431	+	public void checkPermission(Permission p) {}});
432	+	try {
433	+	try {
434	+	task.cancel(true);
435	+	shouldThrow();
436	+	}
437	+	catch (SecurityException expected) {}
438	+	} finally {
439	+	System.setSecurityManager(null);
440	+	}
441	+	assertTrue(task.isCancelled());
442	+	assertTrue(task.isDone());
443	+	assertEquals(1, task.runCount());
444	+	assertEquals(1, task.doneCount());
445	+	assertEquals(0, task.setCount());
446	+	assertEquals(0, task.setExceptionCount());
447	+	cancelled.countDown();
448	+	awaitTermination(t);
449	+	assertEquals(1, task.setCount());
450	+	assertEquals(0, task.setExceptionCount());
451	+	tryToConfuseDoneTask(task);
452	+	checkCancelled(task);
453	+	}
454
455	<	public void testCancelNoInterrupt(){
456	<	FutureTask task = new FutureTask( new Callable() {
457	<	public Object call() {
455	>	/**
456	>	* cancel(true) interrupts a running task that subsequently throws
457	>	*/
458	>	public void testCancelInterrupt_taskFails() {
459	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
460	>	final PublicFutureTask task =
461	>	new PublicFutureTask(new Runnable() {
462	>	public void run() {
463		try {
464	<	Thread.sleep(MEDIUM_DELAY_MS);
465	<	}
466	<	catch (InterruptedException success) {
467	<	threadFail("should not interrupt");
468	<	}
469	<	return Boolean.TRUE;
470	<	} });
471	<	Thread t = new  Thread(task);
472	<	t.start();
473	<
474	<	try{
475	<	Thread.sleep(SHORT_DELAY_MS);
476	<	assertTrue(task.cancel(false));
477	<	t.join();
478	<	assertTrue(task.isDone());
185	<	assertTrue(task.isCancelled());
186	<	} catch(InterruptedException e){
187	<	fail("unexpected exception");
188	<	}
464	>	pleaseCancel.countDown();
465	>	delay(LONG_DELAY_MS);
466	>	} finally { throw new RuntimeException(); }
467	>	}});
468	>
469	>	Thread t = newStartedThread(task);
470	>	await(pleaseCancel);
471	>	assertTrue(task.cancel(true));
472	>	assertTrue(task.isCancelled());
473	>	awaitTermination(t);
474	>	assertEquals(1, task.runCount());
475	>	assertEquals(0, task.setCount());
476	>	assertEquals(1, task.setExceptionCount());
477	>	tryToConfuseDoneTask(task);
478	>	checkCancelled(task);
479		}
480
481	<	public void testGet1() {
482	<	final FutureTask ft = new FutureTask(new Callable(){
483	<	public Object call(){
484	<	try{
485	<	Thread.sleep(MEDIUM_DELAY_MS);
486	<	} catch(InterruptedException e){
487	<	threadFail("unexpected exception");
488	<	}
489	<	return Boolean.TRUE;
490	<	}
491	<	});
492	<	Thread t = new Thread(new Runnable(){
203	<	public void run(){
204	<	try{
205	<	ft.get();
206	<	} catch(Exception e){
207	<	threadFail("unexpected exception");
208	<	}
209	<	}
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	<	}
481	>	/**
482	>	* cancel(false) does not interrupt a running task
483	>	*/
484	>	public void testCancelNoInterrupt() {
485	>	final CountDownLatch pleaseCancel = new CountDownLatch(1);
486	>	final CountDownLatch cancelled = new CountDownLatch(1);
487	>	final PublicFutureTask task =
488	>	new PublicFutureTask(new CheckedCallable<Boolean>() {
489	>	public Boolean realCall() {
490	>	pleaseCancel.countDown();
491	>	await(cancelled);
492	>	assertFalse(Thread.interrupted());
493		return Boolean.TRUE;
494	<	}
495	<	});
496	<	Thread t = new Thread(new Runnable(){
497	<	public void run(){
498	<	try{
499	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
500	<	} catch(TimeoutException success) {
501	<	} catch(Exception e){
502	<	threadFail("unexpected exception");
503	<	}
504	<	}
505	<	});
506	<	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	<	}
494	>	}});
495	>
496	>	Thread t = newStartedThread(task);
497	>	await(pleaseCancel);
498	>	assertTrue(task.cancel(false));
499	>	assertTrue(task.isCancelled());
500	>	cancelled.countDown();
501	>	awaitTermination(t);
502	>	assertEquals(1, task.runCount());
503	>	assertEquals(1, task.setCount());
504	>	assertEquals(0, task.setExceptionCount());
505	>	tryToConfuseDoneTask(task);
506	>	checkCancelled(task);
507		}
508
509	+	/**
510	+	* run in one thread causes get in another thread to retrieve value
511	+	*/
512	+	public void testGetRun() {
513	+	final CountDownLatch pleaseRun = new CountDownLatch(2);
514
515	<	public void testGet_Cancellation(){
516	<	final FutureTask ft = new FutureTask(new Callable(){
517	<	public Object call(){
518	<	try{
519	<	Thread.sleep(MEDIUM_DELAY_MS);
520	<	} catch(InterruptedException e){
521	<	threadFail("unexpected exception");
522	<	}
523	<	return Boolean.TRUE;
524	<	}
525	<	});
526	<	try {
527	<	Thread.sleep(SHORT_DELAY_MS);
528	<	Thread t = new Thread(new Runnable(){
529	<	public void run(){
530	<	try{
531	<	ft.get();
532	<	threadFail("should throw");
533	<	} catch(CancellationException success){
534	<	}
535	<	catch(Exception e){
536	<	threadFail("unexpected exception");
515	>	final PublicFutureTask task =
516	>	new PublicFutureTask(new CheckedCallable<Object>() {
517	>	public Object realCall() {
518	>	return two;
519	>	}});
520	>
521	>	Thread t1 = newStartedThread(new CheckedRunnable() {
522	>	public void realRun() throws Exception {
523	>	pleaseRun.countDown();
524	>	assertSame(two, task.get());
525	>	}});
526	>
527	>	Thread t2 = newStartedThread(new CheckedRunnable() {
528	>	public void realRun() throws Exception {
529	>	pleaseRun.countDown();
530	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
531	>	}});
532	>
533	>	await(pleaseRun);
534	>	checkNotDone(task);
535	>	assertTrue(t1.isAlive());
536	>	assertTrue(t2.isAlive());
537	>	task.run();
538	>	checkCompletedNormally(task, two);
539	>	assertEquals(1, task.runCount());
540	>	assertEquals(1, task.setCount());
541	>	assertEquals(0, task.setExceptionCount());
542	>	awaitTermination(t1);
543	>	awaitTermination(t2);
544	>	tryToConfuseDoneTask(task);
545	>	checkCompletedNormally(task, two);
546	>	}
547	>
548	>	/**
549	>	* set in one thread causes get in another thread to retrieve value
550	>	*/
551	>	public void testGetSet() {
552	>	final CountDownLatch pleaseSet = new CountDownLatch(2);
553	>
554	>	final PublicFutureTask task =
555	>	new PublicFutureTask(new CheckedCallable<Object>() {
556	>	public Object realCall() throws InterruptedException {
557	>	return two;
558	>	}});
559	>
560	>	Thread t1 = newStartedThread(new CheckedRunnable() {
561	>	public void realRun() throws Exception {
562	>	pleaseSet.countDown();
563	>	assertSame(two, task.get());
564	>	}});
565	>
566	>	Thread t2 = newStartedThread(new CheckedRunnable() {
567	>	public void realRun() throws Exception {
568	>	pleaseSet.countDown();
569	>	assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS));
570	>	}});
571	>
572	>	await(pleaseSet);
573	>	checkNotDone(task);
574	>	assertTrue(t1.isAlive());
575	>	assertTrue(t2.isAlive());
576	>	task.set(two);
577	>	assertEquals(0, task.runCount());
578	>	assertEquals(1, task.setCount());
579	>	assertEquals(0, task.setExceptionCount());
580	>	tryToConfuseDoneTask(task);
581	>	checkCompletedNormally(task, two);
582	>	awaitTermination(t1);
583	>	awaitTermination(t2);
584	>	}
585	>
586	>	/**
587	>	* Cancelling a task causes timed get in another thread to throw
588	>	* CancellationException
589	>	*/
590	>	public void testTimedGet_Cancellation() {
591	>	for (final boolean mayInterruptIfRunning :
592	>	new boolean[] { true, false }) {
593	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
594	>	final CountDownLatch cancelled = new CountDownLatch(1);
595	>	final PublicFutureTask task =
596	>	new PublicFutureTask(new CheckedCallable<Object>() {
597	>	public Object realCall() throws InterruptedException {
598	>	pleaseCancel.countDown();
599	>	if (mayInterruptIfRunning) {
600	>	try {
601	>	delay(2*LONG_DELAY_MS);
602	>	} catch (InterruptedException success) {}
603	>	} else {
604	>	await(cancelled);
605		}
606	<	}
607	<	});
608	<	t.start();
609	<	ft.cancel(true);
610	<	t.join();
611	<	} catch(InterruptedException success){
612	<	fail("unexpected exception");
613	<	}
614	<	}
615	<
616	<	public void testGet_Cancellation2(){
617	<	final FutureTask ft = new FutureTask(new Callable(){
618	<	public Object call(){
619	<	try{
620	<	Thread.sleep(SHORT_DELAY_MS);
621	<	} catch(InterruptedException e) {
622	<	threadFail("unexpected exception");
623	<	}
624	<	return Boolean.TRUE;
625	<	}
626	<	});
627	<	try{
628	<	Thread.sleep(SHORT_DELAY_MS);
629	<	Thread t = new Thread(new Runnable(){
630	<	public void run(){
631	<	try{
632	<	ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
633	<	threadFail("should throw");
634	<	} catch(CancellationException success) {}
635	<	catch(Exception e){
636	<	threadFail("unexpected exception");
637	<	}
638	<	}
639	<	});
640	<	t.start();
641	<	Thread.sleep(SHORT_DELAY_MS);
642	<	ft.cancel(true);
643	<	Thread.sleep(SHORT_DELAY_MS);
644	<	t.join();
645	<	} catch(InterruptedException ie){
646	<	fail("unexpected exception");
647	<	}
648	<	}
649	<
650	<	public void testGet_ExecutionException(){
651	<	final FutureTask ft = new FutureTask(new Callable(){
652	<	public Object call(){
653	<	int i = 5/0;
654	<	return Boolean.TRUE;
655	<	}
656	<	});
657	<	try{
658	<	ft.run();
659	<	ft.get();
660	<	fail("should throw");
661	<	} catch(ExecutionException success){
662	<	}
663	<	catch(Exception e){
664	<	fail("unexpected exception");
665	<	}
666	<	}
667	<
668	<	public void testTimedGet_ExecutionException2(){
669	<	final FutureTask ft = new FutureTask(new Callable(){
670	<	public Object call(){
671	<	int i = 5/0;
672	<	return Boolean.TRUE;
673	<	}
674	<	});
675	<	try{
676	<	ft.run();
677	<	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
678	<	fail("should throw");
679	<	} catch(ExecutionException success) {
680	<	} catch(TimeoutException success) { } // unlikely but OK
681	<	catch(Exception e){
682	<	fail("unexpected exception");
683	<	}
684	<	}
685	<
686	<
687	<	public void testGet_InterruptedException(){
688	<	final FutureTask ft = new FutureTask(new NoOpCallable());
689	<	Thread t = new Thread(new Runnable(){
690	<	public void run(){
691	<	try{
692	<	ft.get();
693	<	threadFail("should throw");
694	<	} catch(InterruptedException success){
695	<	} catch(Exception e){
696	<	threadFail("unexpected exception");
697	<	}
698	<	}
699	<	});
700	<	try {
701	<	t.start();
702	<	Thread.sleep(SHORT_DELAY_MS);
703	<	t.interrupt();
704	<	t.join();
705	<	} catch(Exception e){
706	<	fail("unexpected exception");
707	<	}
708	<	}
709	<
710	<	public void testTimedGet_InterruptedException2(){
711	<	final FutureTask ft = new FutureTask(new NoOpCallable());
712	<	Thread t = new Thread(new Runnable(){
713	<	public void run(){
714	<	try{
715	<	ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
716	<	threadFail("should throw");
717	<	} catch(InterruptedException success){}
718	<	catch(Exception e){
719	<	threadFail("unexpected exception");
720	<	}
721	<	}
722	<	});
723	<	try {
724	<	t.start();
725	<	Thread.sleep(SHORT_DELAY_MS);
726	<	t.interrupt();
727	<	t.join();
728	<	} catch(Exception e){
729	<	fail("unexpected exception");
730	<	}
731	<	}
732	<
733	<	public void testGet_TimeoutException(){
734	<	try{
735	<	FutureTask ft = new FutureTask(new NoOpCallable());
736	<	ft.get(1,TimeUnit.MILLISECONDS);
737	<	fail("should throw");
738	<	} catch(TimeoutException success){}
418	<	catch(Exception success){
419	<	fail("unexpected exception");
420	<	}
606	>	return two;
607	>	}});
608	>
609	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
610	>	public void realRun() throws Exception {
611	>	pleaseCancel.countDown();
612	>	task.get();
613	>	}};
614	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
615	>	public void realRun() throws Exception {
616	>	pleaseCancel.countDown();
617	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
618	>	}};
619	>	t1.start();
620	>	t2.start();
621	>	Thread t3 = newStartedThread(task);
622	>	await(pleaseCancel);
623	>	checkIsRunning(task);
624	>	task.cancel(mayInterruptIfRunning);
625	>	checkCancelled(task);
626	>	awaitTermination(t1);
627	>	awaitTermination(t2);
628	>	cancelled.countDown();
629	>	awaitTermination(t3);
630	>	assertEquals(1, task.runCount());
631	>	assertEquals(1, task.setCount());
632	>	assertEquals(0, task.setExceptionCount());
633	>	tryToConfuseDoneTask(task);
634	>	checkCancelled(task);
635	>	}
636	>	}
637	>
638	>	/**
639	>	* A runtime exception in task causes get to throw ExecutionException
640	>	*/
641	>	public void testGet_ExecutionException() throws InterruptedException {
642	>	final ArithmeticException e = new ArithmeticException();
643	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
644	>	public Object call() {
645	>	throw e;
646	>	}});
647	>
648	>	task.run();
649	>	assertEquals(1, task.runCount());
650	>	assertEquals(0, task.setCount());
651	>	assertEquals(1, task.setExceptionCount());
652	>	try {
653	>	task.get();
654	>	shouldThrow();
655	>	} catch (ExecutionException success) {
656	>	assertSame(e, success.getCause());
657	>	tryToConfuseDoneTask(task);
658	>	checkCompletedAbnormally(task, success.getCause());
659	>	}
660	>	}
661	>
662	>	/**
663	>	* A runtime exception in task causes timed get to throw ExecutionException
664	>	*/
665	>	public void testTimedGet_ExecutionException2() throws Exception {
666	>	final ArithmeticException e = new ArithmeticException();
667	>	final PublicFutureTask task = new PublicFutureTask(new Callable() {
668	>	public Object call() {
669	>	throw e;
670	>	}});
671	>
672	>	task.run();
673	>	try {
674	>	task.get(LONG_DELAY_MS, MILLISECONDS);
675	>	shouldThrow();
676	>	} catch (ExecutionException success) {
677	>	assertSame(e, success.getCause());
678	>	tryToConfuseDoneTask(task);
679	>	checkCompletedAbnormally(task, success.getCause());
680	>	}
681	>	}
682	>
683	>	/**
684	>	* get is interruptible
685	>	*/
686	>	public void testGet_interruptible() {
687	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
688	>	final FutureTask task = new FutureTask(new NoOpCallable());
689	>	Thread t = newStartedThread(new CheckedRunnable() {
690	>	public void realRun() throws Exception {
691	>	Thread.currentThread().interrupt();
692	>	try {
693	>	task.get();
694	>	shouldThrow();
695	>	} catch (InterruptedException success) {}
696	>	assertFalse(Thread.interrupted());
697	>
698	>	pleaseInterrupt.countDown();
699	>	try {
700	>	task.get();
701	>	shouldThrow();
702	>	} catch (InterruptedException success) {}
703	>	assertFalse(Thread.interrupted());
704	>	}});
705	>
706	>	await(pleaseInterrupt);
707	>	t.interrupt();
708	>	awaitTermination(t);
709	>	checkNotDone(task);
710	>	}
711	>
712	>	/**
713	>	* timed get is interruptible
714	>	*/
715	>	public void testTimedGet_interruptible() {
716	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
717	>	final FutureTask task = new FutureTask(new NoOpCallable());
718	>	Thread t = newStartedThread(new CheckedRunnable() {
719	>	public void realRun() throws Exception {
720	>	Thread.currentThread().interrupt();
721	>	try {
722	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
723	>	shouldThrow();
724	>	} catch (InterruptedException success) {}
725	>	assertFalse(Thread.interrupted());
726	>
727	>	pleaseInterrupt.countDown();
728	>	try {
729	>	task.get(2*LONG_DELAY_MS, MILLISECONDS);
730	>	shouldThrow();
731	>	} catch (InterruptedException success) {}
732	>	assertFalse(Thread.interrupted());
733	>	}});
734	>
735	>	await(pleaseInterrupt);
736	>	t.interrupt();
737	>	awaitTermination(t);
738	>	checkNotDone(task);
739		}
740	<
740	>
741	>	/**
742	>	* A timed out timed get throws TimeoutException
743	>	*/
744	>	public void testGet_TimeoutException() throws Exception {
745	>	FutureTask task = new FutureTask(new NoOpCallable());
746	>	long startTime = System.nanoTime();
747	>	try {
748	>	task.get(timeoutMillis(), MILLISECONDS);
749	>	shouldThrow();
750	>	} catch (TimeoutException success) {
751	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
752	>	}
753	>	}
754	>
755	>	/**
756	>	* timed get with null TimeUnit throws NullPointerException
757	>	*/
758	>	public void testGet_NullTimeUnit() throws Exception {
759	>	FutureTask task = new FutureTask(new NoOpCallable());
760	>	long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
761	>
762	>	for (long timeout : timeouts) {
763	>	try {
764	>	task.get(timeout, null);
765	>	shouldThrow();
766	>	} catch (NullPointerException success) {}
767	>	}
768	>
769	>	task.run();
770	>
771	>	for (long timeout : timeouts) {
772	>	try {
773	>	task.get(timeout, null);
774	>	shouldThrow();
775	>	} catch (NullPointerException success) {}
776	>	}
777	>	}
778	>
779		}

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