1 |
/* |
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 |
|
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import junit.framework.*; |
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 |
|
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public class FutureTaskTest extends JSR166TestCase { |
23 |
|
24 |
public static void main(String[] args) { |
25 |
junit.textui.TestRunner.run(suite()); |
26 |
} |
27 |
public static Test suite() { |
28 |
return new TestSuite(FutureTaskTest.class); |
29 |
} |
30 |
|
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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 |
|
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// Check that run and runAndReset have no effect. |
42 |
int savedRunCount = pf.runCount(); |
43 |
int savedSetCount = pf.setCount(); |
44 |
int savedSetExceptionCount = pf.setExceptionCount(); |
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pf.run(); |
46 |
pf.runAndReset(); |
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assertEquals(savedRunCount, pf.runCount()); |
48 |
assertEquals(savedSetCount, pf.setCount()); |
49 |
assertEquals(savedSetExceptionCount, pf.setExceptionCount()); |
50 |
assertTrue(f.isDone()); |
51 |
} |
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} |
53 |
|
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 |
} |
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 |
} |
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|
77 |
<T> void checkCompletedNormally(Future<T> f, T expected) { |
78 |
checkIsDone(f); |
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assertFalse(f.isCancelled()); |
80 |
|
81 |
try { |
82 |
assertSame(expected, f.get()); |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
84 |
try { |
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assertSame(expected, f.get(5L, SECONDS)); |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
87 |
} |
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|
89 |
void checkCancelled(Future<?> f) { |
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checkIsDone(f); |
91 |
assertTrue(f.isCancelled()); |
92 |
|
93 |
try { |
94 |
f.get(); |
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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) { |
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pf.set(new Object()); |
108 |
pf.setException(new Error()); |
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for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
110 |
pf.cancel(true); |
111 |
} |
112 |
} |
113 |
|
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()); |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
124 |
|
125 |
try { |
126 |
f.get(5L, SECONDS); |
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shouldThrow(); |
128 |
} catch (ExecutionException success) { |
129 |
assertSame(t, success.getCause()); |
130 |
} catch (Throwable fail) { threadUnexpectedException(fail); } |
131 |
} |
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|
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/** |
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* Subclass to expose protected methods |
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*/ |
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static class PublicFutureTask extends FutureTask { |
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private final AtomicInteger runCount; |
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private final AtomicInteger doneCount = new AtomicInteger(0); |
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private final AtomicInteger runAndResetCount = new AtomicInteger(0); |
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private final AtomicInteger setCount = new AtomicInteger(0); |
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private final AtomicInteger setExceptionCount = new AtomicInteger(0); |
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public int runCount() { return runCount.get(); } |
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public int doneCount() { return doneCount.get(); } |
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public int runAndResetCount() { return runAndResetCount.get(); } |
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public int setCount() { return setCount.get(); } |
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public int setExceptionCount() { return setExceptionCount.get(); } |
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|
148 |
PublicFutureTask(Runnable runnable) { |
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this(runnable, seven); |
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} |
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PublicFutureTask(Runnable runnable, Object result) { |
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this(runnable, result, new AtomicInteger(0)); |
153 |
} |
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private PublicFutureTask(final Runnable runnable, Object result, |
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final AtomicInteger runCount) { |
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super(new Runnable() { |
157 |
public void run() { |
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runCount.getAndIncrement(); |
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runnable.run(); |
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}}, result); |
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this.runCount = runCount; |
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} |
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PublicFutureTask(Callable callable) { |
164 |
this(callable, new AtomicInteger(0)); |
165 |
} |
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private PublicFutureTask(final Callable callable, |
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final AtomicInteger runCount) { |
168 |
super(new Callable() { |
169 |
public Object call() throws Exception { |
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runCount.getAndIncrement(); |
171 |
return callable.call(); |
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}}); |
173 |
this.runCount = runCount; |
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} |
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@Override public void done() { |
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assertTrue(isDone()); |
177 |
doneCount.incrementAndGet(); |
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super.done(); |
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} |
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@Override public boolean runAndReset() { |
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runAndResetCount.incrementAndGet(); |
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return super.runAndReset(); |
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} |
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@Override public void set(Object x) { |
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setCount.incrementAndGet(); |
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super.set(x); |
187 |
} |
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@Override public void setException(Throwable t) { |
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setExceptionCount.incrementAndGet(); |
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super.setException(t); |
191 |
} |
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} |
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|
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class Counter extends CheckedRunnable { |
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final AtomicInteger count = new AtomicInteger(0); |
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public int get() { return count.get(); } |
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public void realRun() { |
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count.getAndIncrement(); |
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} |
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} |
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|
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/** |
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* creating a future with a null callable throws NullPointerException |
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*/ |
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public void testConstructor() { |
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try { |
207 |
new FutureTask(null); |
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shouldThrow(); |
209 |
} catch (NullPointerException success) {} |
210 |
} |
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|
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/** |
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* 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 |
/** |
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* isDone is true when a task completes |
224 |
*/ |
225 |
public void testIsDone() { |
226 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
227 |
assertFalse(task.isDone()); |
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task.run(); |
229 |
assertTrue(task.isDone()); |
230 |
checkCompletedNormally(task, Boolean.TRUE); |
231 |
assertEquals(1, task.runCount()); |
232 |
} |
233 |
|
234 |
/** |
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* 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 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
320 |
assertTrue(task.cancel(false)); |
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 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
337 |
assertTrue(task.cancel(true)); |
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 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
354 |
task.run(); |
355 |
assertFalse(task.cancel(false)); |
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 |
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 |
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 |
pleaseCancel.countDown(); |
463 |
delay(LONG_DELAY_MS); |
464 |
shouldThrow(); |
465 |
} catch (Throwable t) { |
466 |
assertTrue(t instanceof InterruptedException); |
467 |
} |
468 |
throw new RuntimeException(); |
469 |
}}); |
470 |
|
471 |
Thread t = newStartedThread(task); |
472 |
await(pleaseCancel); |
473 |
assertTrue(task.cancel(true)); |
474 |
assertTrue(task.isCancelled()); |
475 |
awaitTermination(t); |
476 |
assertEquals(1, task.runCount()); |
477 |
assertEquals(0, task.setCount()); |
478 |
assertEquals(1, task.setExceptionCount()); |
479 |
tryToConfuseDoneTask(task); |
480 |
checkCancelled(task); |
481 |
} |
482 |
|
483 |
/** |
484 |
* cancel(false) does not interrupt a running task |
485 |
*/ |
486 |
public void testCancelNoInterrupt() { |
487 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
488 |
final CountDownLatch cancelled = new CountDownLatch(1); |
489 |
final PublicFutureTask task = |
490 |
new PublicFutureTask(new CheckedCallable<Boolean>() { |
491 |
public Boolean realCall() { |
492 |
pleaseCancel.countDown(); |
493 |
await(cancelled); |
494 |
assertFalse(Thread.interrupted()); |
495 |
return Boolean.TRUE; |
496 |
}}); |
497 |
|
498 |
Thread t = newStartedThread(task); |
499 |
await(pleaseCancel); |
500 |
assertTrue(task.cancel(false)); |
501 |
assertTrue(task.isCancelled()); |
502 |
cancelled.countDown(); |
503 |
awaitTermination(t); |
504 |
assertEquals(1, task.runCount()); |
505 |
assertEquals(1, task.setCount()); |
506 |
assertEquals(0, task.setExceptionCount()); |
507 |
tryToConfuseDoneTask(task); |
508 |
checkCancelled(task); |
509 |
} |
510 |
|
511 |
/** |
512 |
* run in one thread causes get in another thread to retrieve value |
513 |
*/ |
514 |
public void testGetRun() { |
515 |
final CountDownLatch pleaseRun = new CountDownLatch(2); |
516 |
|
517 |
final PublicFutureTask task = |
518 |
new PublicFutureTask(new CheckedCallable<Object>() { |
519 |
public Object realCall() { |
520 |
return two; |
521 |
}}); |
522 |
|
523 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
524 |
public void realRun() throws Exception { |
525 |
pleaseRun.countDown(); |
526 |
assertSame(two, task.get()); |
527 |
}}); |
528 |
|
529 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
530 |
public void realRun() throws Exception { |
531 |
pleaseRun.countDown(); |
532 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
533 |
}}); |
534 |
|
535 |
await(pleaseRun); |
536 |
checkNotDone(task); |
537 |
assertTrue(t1.isAlive()); |
538 |
assertTrue(t2.isAlive()); |
539 |
task.run(); |
540 |
checkCompletedNormally(task, two); |
541 |
assertEquals(1, task.runCount()); |
542 |
assertEquals(1, task.setCount()); |
543 |
assertEquals(0, task.setExceptionCount()); |
544 |
awaitTermination(t1); |
545 |
awaitTermination(t2); |
546 |
tryToConfuseDoneTask(task); |
547 |
checkCompletedNormally(task, two); |
548 |
} |
549 |
|
550 |
/** |
551 |
* set in one thread causes get in another thread to retrieve value |
552 |
*/ |
553 |
public void testGetSet() { |
554 |
final CountDownLatch pleaseSet = new CountDownLatch(2); |
555 |
|
556 |
final PublicFutureTask task = |
557 |
new PublicFutureTask(new CheckedCallable<Object>() { |
558 |
public Object realCall() throws InterruptedException { |
559 |
return two; |
560 |
}}); |
561 |
|
562 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
563 |
public void realRun() throws Exception { |
564 |
pleaseSet.countDown(); |
565 |
assertSame(two, task.get()); |
566 |
}}); |
567 |
|
568 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
569 |
public void realRun() throws Exception { |
570 |
pleaseSet.countDown(); |
571 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
572 |
}}); |
573 |
|
574 |
await(pleaseSet); |
575 |
checkNotDone(task); |
576 |
assertTrue(t1.isAlive()); |
577 |
assertTrue(t2.isAlive()); |
578 |
task.set(two); |
579 |
assertEquals(0, task.runCount()); |
580 |
assertEquals(1, task.setCount()); |
581 |
assertEquals(0, task.setExceptionCount()); |
582 |
tryToConfuseDoneTask(task); |
583 |
checkCompletedNormally(task, two); |
584 |
awaitTermination(t1); |
585 |
awaitTermination(t2); |
586 |
} |
587 |
|
588 |
/** |
589 |
* Cancelling a task causes timed get in another thread to throw |
590 |
* CancellationException |
591 |
*/ |
592 |
public void testTimedGet_Cancellation() { |
593 |
testTimedGet_Cancellation(false); |
594 |
} |
595 |
public void testTimedGet_Cancellation_interrupt() { |
596 |
testTimedGet_Cancellation(true); |
597 |
} |
598 |
public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) { |
599 |
final CountDownLatch pleaseCancel = new CountDownLatch(3); |
600 |
final CountDownLatch cancelled = new CountDownLatch(1); |
601 |
final Callable<Object> callable = |
602 |
new CheckedCallable<Object>() { |
603 |
public Object realCall() throws InterruptedException { |
604 |
pleaseCancel.countDown(); |
605 |
if (mayInterruptIfRunning) { |
606 |
try { |
607 |
delay(2*LONG_DELAY_MS); |
608 |
} catch (InterruptedException success) {} |
609 |
} else { |
610 |
await(cancelled); |
611 |
} |
612 |
return two; |
613 |
}}; |
614 |
final PublicFutureTask task = new PublicFutureTask(callable); |
615 |
|
616 |
Thread t1 = new ThreadShouldThrow(CancellationException.class) { |
617 |
public void realRun() throws Exception { |
618 |
pleaseCancel.countDown(); |
619 |
task.get(); |
620 |
}}; |
621 |
Thread t2 = new ThreadShouldThrow(CancellationException.class) { |
622 |
public void realRun() throws Exception { |
623 |
pleaseCancel.countDown(); |
624 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
625 |
}}; |
626 |
t1.start(); |
627 |
t2.start(); |
628 |
Thread t3 = newStartedThread(task); |
629 |
await(pleaseCancel); |
630 |
checkIsRunning(task); |
631 |
task.cancel(mayInterruptIfRunning); |
632 |
checkCancelled(task); |
633 |
awaitTermination(t1); |
634 |
awaitTermination(t2); |
635 |
cancelled.countDown(); |
636 |
awaitTermination(t3); |
637 |
assertEquals(1, task.runCount()); |
638 |
assertEquals(1, task.setCount()); |
639 |
assertEquals(0, task.setExceptionCount()); |
640 |
tryToConfuseDoneTask(task); |
641 |
checkCancelled(task); |
642 |
} |
643 |
|
644 |
/** |
645 |
* A runtime exception in task causes get to throw ExecutionException |
646 |
*/ |
647 |
public void testGet_ExecutionException() throws InterruptedException { |
648 |
final ArithmeticException e = new ArithmeticException(); |
649 |
final PublicFutureTask task = new PublicFutureTask(new Callable() { |
650 |
public Object call() { |
651 |
throw e; |
652 |
}}); |
653 |
|
654 |
task.run(); |
655 |
assertEquals(1, task.runCount()); |
656 |
assertEquals(0, task.setCount()); |
657 |
assertEquals(1, task.setExceptionCount()); |
658 |
try { |
659 |
task.get(); |
660 |
shouldThrow(); |
661 |
} catch (ExecutionException success) { |
662 |
assertSame(e, success.getCause()); |
663 |
tryToConfuseDoneTask(task); |
664 |
checkCompletedAbnormally(task, success.getCause()); |
665 |
} |
666 |
} |
667 |
|
668 |
/** |
669 |
* A runtime exception in task causes timed get to throw ExecutionException |
670 |
*/ |
671 |
public void testTimedGet_ExecutionException2() throws Exception { |
672 |
final ArithmeticException e = new ArithmeticException(); |
673 |
final PublicFutureTask task = new PublicFutureTask(new Callable() { |
674 |
public Object call() { |
675 |
throw e; |
676 |
}}); |
677 |
|
678 |
task.run(); |
679 |
try { |
680 |
task.get(LONG_DELAY_MS, MILLISECONDS); |
681 |
shouldThrow(); |
682 |
} catch (ExecutionException success) { |
683 |
assertSame(e, success.getCause()); |
684 |
tryToConfuseDoneTask(task); |
685 |
checkCompletedAbnormally(task, success.getCause()); |
686 |
} |
687 |
} |
688 |
|
689 |
/** |
690 |
* get is interruptible |
691 |
*/ |
692 |
public void testGet_interruptible() { |
693 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
694 |
final FutureTask task = new FutureTask(new NoOpCallable()); |
695 |
Thread t = newStartedThread(new CheckedRunnable() { |
696 |
public void realRun() throws Exception { |
697 |
Thread.currentThread().interrupt(); |
698 |
try { |
699 |
task.get(); |
700 |
shouldThrow(); |
701 |
} catch (InterruptedException success) {} |
702 |
assertFalse(Thread.interrupted()); |
703 |
|
704 |
pleaseInterrupt.countDown(); |
705 |
try { |
706 |
task.get(); |
707 |
shouldThrow(); |
708 |
} catch (InterruptedException success) {} |
709 |
assertFalse(Thread.interrupted()); |
710 |
}}); |
711 |
|
712 |
await(pleaseInterrupt); |
713 |
t.interrupt(); |
714 |
awaitTermination(t); |
715 |
checkNotDone(task); |
716 |
} |
717 |
|
718 |
/** |
719 |
* timed get is interruptible |
720 |
*/ |
721 |
public void testTimedGet_interruptible() { |
722 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
723 |
final FutureTask task = new FutureTask(new NoOpCallable()); |
724 |
Thread t = newStartedThread(new CheckedRunnable() { |
725 |
public void realRun() throws Exception { |
726 |
Thread.currentThread().interrupt(); |
727 |
try { |
728 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
729 |
shouldThrow(); |
730 |
} catch (InterruptedException success) {} |
731 |
assertFalse(Thread.interrupted()); |
732 |
|
733 |
pleaseInterrupt.countDown(); |
734 |
try { |
735 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
736 |
shouldThrow(); |
737 |
} catch (InterruptedException success) {} |
738 |
assertFalse(Thread.interrupted()); |
739 |
}}); |
740 |
|
741 |
await(pleaseInterrupt); |
742 |
t.interrupt(); |
743 |
awaitTermination(t); |
744 |
checkNotDone(task); |
745 |
} |
746 |
|
747 |
/** |
748 |
* A timed out timed get throws TimeoutException |
749 |
*/ |
750 |
public void testGet_TimeoutException() throws Exception { |
751 |
FutureTask task = new FutureTask(new NoOpCallable()); |
752 |
long startTime = System.nanoTime(); |
753 |
try { |
754 |
task.get(timeoutMillis(), MILLISECONDS); |
755 |
shouldThrow(); |
756 |
} catch (TimeoutException success) { |
757 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
758 |
} |
759 |
} |
760 |
|
761 |
/** |
762 |
* timed get with null TimeUnit throws NullPointerException |
763 |
*/ |
764 |
public void testGet_NullTimeUnit() throws Exception { |
765 |
FutureTask task = new FutureTask(new NoOpCallable()); |
766 |
long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE }; |
767 |
|
768 |
for (long timeout : timeouts) { |
769 |
try { |
770 |
task.get(timeout, null); |
771 |
shouldThrow(); |
772 |
} catch (NullPointerException success) {} |
773 |
} |
774 |
|
775 |
task.run(); |
776 |
|
777 |
for (long timeout : timeouts) { |
778 |
try { |
779 |
task.get(timeout, null); |
780 |
shouldThrow(); |
781 |
} catch (NullPointerException success) {} |
782 |
} |
783 |
} |
784 |
|
785 |
} |