Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 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 | |
| 9 | package jsr166; |
| 10 | |
| 11 | import junit.framework.*; |
| 12 | import java.util.concurrent.Callable; |
| 13 | import java.util.concurrent.CancellationException; |
| 14 | import java.util.concurrent.CountDownLatch; |
| 15 | import java.util.concurrent.ExecutionException; |
| 16 | import java.util.concurrent.Future; |
| 17 | import java.util.concurrent.FutureTask; |
| 18 | import java.util.concurrent.TimeoutException; |
| 19 | import java.util.concurrent.atomic.AtomicInteger; |
| 20 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 21 | import static java.util.concurrent.TimeUnit.SECONDS; |
| 22 | import java.util.*; |
| 23 | |
| 24 | public class FutureTaskTest extends JSR166TestCase { |
| 25 | |
| 26 | void checkIsDone(Future<?> f) { |
| 27 | assertTrue(f.isDone()); |
| 28 | assertFalse(f.cancel(false)); |
| 29 | assertFalse(f.cancel(true)); |
| 30 | if (f instanceof PublicFutureTask) { |
| 31 | PublicFutureTask pf = (PublicFutureTask) f; |
| 32 | assertEquals(1, pf.doneCount()); |
| 33 | assertFalse(pf.runAndReset()); |
| 34 | assertEquals(1, pf.doneCount()); |
| 35 | Object r = null; Object exInfo = null; |
| 36 | try { |
| 37 | r = f.get(); |
| 38 | } catch (CancellationException t) { |
| 39 | exInfo = CancellationException.class; |
| 40 | } catch (ExecutionException t) { |
| 41 | exInfo = t.getCause(); |
| 42 | } catch (Throwable t) { |
| 43 | threadUnexpectedException(t); |
| 44 | } |
| 45 | |
| 46 | // Check that run and runAndReset have no effect. |
| 47 | int savedRunCount = pf.runCount(); |
| 48 | pf.run(); |
| 49 | pf.runAndReset(); |
| 50 | assertEquals(savedRunCount, pf.runCount()); |
| 51 | try { |
| 52 | assertSame(r, f.get()); |
| 53 | } catch (CancellationException t) { |
| 54 | assertSame(exInfo, CancellationException.class); |
| 55 | } catch (ExecutionException t) { |
| 56 | assertSame(exInfo, t.getCause()); |
| 57 | } catch (Throwable t) { |
| 58 | threadUnexpectedException(t); |
| 59 | } |
| 60 | assertTrue(f.isDone()); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | void checkNotDone(Future<?> f) { |
| 65 | assertFalse(f.isDone()); |
| 66 | assertFalse(f.isCancelled()); |
| 67 | if (f instanceof PublicFutureTask) { |
| 68 | PublicFutureTask pf = (PublicFutureTask) f; |
| 69 | assertEquals(0, pf.doneCount()); |
| 70 | assertEquals(0, pf.setCount()); |
| 71 | assertEquals(0, pf.setExceptionCount()); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | void checkIsRunning(Future<?> f) { |
| 76 | checkNotDone(f); |
| 77 | if (f instanceof FutureTask) { |
| 78 | FutureTask ft = (FutureTask<?>) f; |
| 79 | // Check that run methods do nothing |
| 80 | ft.run(); |
| 81 | if (f instanceof PublicFutureTask) { |
| 82 | PublicFutureTask pf = (PublicFutureTask) f; |
| 83 | int savedRunCount = pf.runCount(); |
| 84 | pf.run(); |
| 85 | assertFalse(pf.runAndReset()); |
| 86 | assertEquals(savedRunCount, pf.runCount()); |
| 87 | } |
| 88 | checkNotDone(f); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | <T> void checkCompletedNormally(Future<T> f, T expected) { |
| 93 | checkIsDone(f); |
| 94 | assertFalse(f.isCancelled()); |
| 95 | |
| 96 | try { |
| 97 | assertSame(expected, f.get()); |
| 98 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 99 | try { |
| 100 | assertSame(expected, f.get(5L, SECONDS)); |
| 101 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 102 | } |
| 103 | |
| 104 | void checkCancelled(Future<?> f) { |
| 105 | checkIsDone(f); |
| 106 | assertTrue(f.isCancelled()); |
| 107 | |
| 108 | try { |
| 109 | f.get(); |
| 110 | shouldThrow(); |
| 111 | } catch (CancellationException success) { |
| 112 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 113 | |
| 114 | try { |
| 115 | f.get(5L, SECONDS); |
| 116 | shouldThrow(); |
| 117 | } catch (CancellationException success) { |
| 118 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 119 | } |
| 120 | |
| 121 | void tryToConfuseDoneTask(PublicFutureTask pf) { |
| 122 | pf.set(new Object()); |
| 123 | pf.setException(new Error()); |
| 124 | for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
| 125 | pf.cancel(true); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | void checkCompletedAbnormally(Future<?> f, Throwable t) { |
| 130 | checkIsDone(f); |
| 131 | assertFalse(f.isCancelled()); |
| 132 | |
| 133 | try { |
| 134 | f.get(); |
| 135 | shouldThrow(); |
| 136 | } catch (ExecutionException success) { |
| 137 | assertSame(t, success.getCause()); |
| 138 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 139 | |
| 140 | try { |
| 141 | f.get(5L, SECONDS); |
| 142 | shouldThrow(); |
| 143 | } catch (ExecutionException success) { |
| 144 | assertSame(t, success.getCause()); |
| 145 | } catch (Throwable fail) { threadUnexpectedException(fail); } |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Subclass to expose protected methods |
| 150 | */ |
| 151 | static class PublicFutureTask extends FutureTask { |
| 152 | private final AtomicInteger runCount; |
| 153 | private final AtomicInteger doneCount = new AtomicInteger(0); |
| 154 | private final AtomicInteger runAndResetCount = new AtomicInteger(0); |
| 155 | private final AtomicInteger setCount = new AtomicInteger(0); |
| 156 | private final AtomicInteger setExceptionCount = new AtomicInteger(0); |
| 157 | public int runCount() { return runCount.get(); } |
| 158 | public int doneCount() { return doneCount.get(); } |
| 159 | public int runAndResetCount() { return runAndResetCount.get(); } |
| 160 | public int setCount() { return setCount.get(); } |
| 161 | public int setExceptionCount() { return setExceptionCount.get(); } |
| 162 | |
| 163 | PublicFutureTask(Runnable runnable) { |
| 164 | this(runnable, seven); |
| 165 | } |
| 166 | PublicFutureTask(Runnable runnable, Object result) { |
| 167 | this(runnable, result, new AtomicInteger(0)); |
| 168 | } |
| 169 | private PublicFutureTask(final Runnable runnable, Object result, |
| 170 | final AtomicInteger runCount) { |
| 171 | super(new Runnable() { |
| 172 | public void run() { |
| 173 | runCount.getAndIncrement(); |
| 174 | runnable.run(); |
| 175 | }}, result); |
| 176 | this.runCount = runCount; |
| 177 | } |
| 178 | PublicFutureTask(Callable callable) { |
| 179 | this(callable, new AtomicInteger(0)); |
| 180 | } |
| 181 | private PublicFutureTask(final Callable callable, |
| 182 | final AtomicInteger runCount) { |
| 183 | super(new Callable() { |
| 184 | public Object call() throws Exception { |
| 185 | runCount.getAndIncrement(); |
| 186 | return callable.call(); |
| 187 | }}); |
| 188 | this.runCount = runCount; |
| 189 | } |
| 190 | @Override public void done() { |
| 191 | assertTrue(isDone()); |
| 192 | doneCount.incrementAndGet(); |
| 193 | super.done(); |
| 194 | } |
| 195 | @Override public boolean runAndReset() { |
| 196 | runAndResetCount.incrementAndGet(); |
| 197 | return super.runAndReset(); |
| 198 | } |
| 199 | @Override public void set(Object x) { |
| 200 | setCount.incrementAndGet(); |
| 201 | super.set(x); |
| 202 | } |
| 203 | @Override public void setException(Throwable t) { |
| 204 | setExceptionCount.incrementAndGet(); |
| 205 | super.setException(t); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | class Counter extends CheckedRunnable { |
| 210 | final AtomicInteger count = new AtomicInteger(0); |
| 211 | public int get() { return count.get(); } |
| 212 | public void realRun() { |
| 213 | count.getAndIncrement(); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * creating a future with a null callable throws NullPointerException |
| 219 | */ |
| 220 | public void testConstructor() { |
| 221 | try { |
| 222 | new FutureTask(null); |
| 223 | shouldThrow(); |
| 224 | } catch (NullPointerException success) {} |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * creating a future with null runnable throws NullPointerException |
| 229 | */ |
| 230 | public void testConstructor2() { |
| 231 | try { |
| 232 | new FutureTask(null, Boolean.TRUE); |
| 233 | shouldThrow(); |
| 234 | } catch (NullPointerException success) {} |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * isDone is true when a task completes |
| 239 | */ |
| 240 | public void testIsDone() { |
| 241 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 242 | assertFalse(task.isDone()); |
| 243 | task.run(); |
| 244 | assertTrue(task.isDone()); |
| 245 | checkCompletedNormally(task, Boolean.TRUE); |
| 246 | assertEquals(1, task.runCount()); |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * runAndReset of a non-cancelled task succeeds |
| 251 | */ |
| 252 | public void testRunAndReset() { |
| 253 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 254 | for (int i = 0; i < 3; i++) { |
| 255 | assertTrue(task.runAndReset()); |
| 256 | checkNotDone(task); |
| 257 | assertEquals(i+1, task.runCount()); |
| 258 | assertEquals(i+1, task.runAndResetCount()); |
| 259 | assertEquals(0, task.setCount()); |
| 260 | assertEquals(0, task.setExceptionCount()); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * runAndReset after cancellation fails |
| 266 | */ |
| 267 | public void testRunAndResetAfterCancel() { |
| 268 | for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
| 269 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 270 | assertTrue(task.cancel(mayInterruptIfRunning)); |
| 271 | for (int i = 0; i < 3; i++) { |
| 272 | assertFalse(task.runAndReset()); |
| 273 | assertEquals(0, task.runCount()); |
| 274 | assertEquals(i+1, task.runAndResetCount()); |
| 275 | assertEquals(0, task.setCount()); |
| 276 | assertEquals(0, task.setExceptionCount()); |
| 277 | } |
| 278 | tryToConfuseDoneTask(task); |
| 279 | checkCancelled(task); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * setting value causes get to return it |
| 285 | */ |
| 286 | public void testSet() throws Exception { |
| 287 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 288 | task.set(one); |
| 289 | for (int i = 0; i < 3; i++) { |
| 290 | assertSame(one, task.get()); |
| 291 | assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS)); |
| 292 | assertEquals(1, task.setCount()); |
| 293 | } |
| 294 | tryToConfuseDoneTask(task); |
| 295 | checkCompletedNormally(task, one); |
| 296 | assertEquals(0, task.runCount()); |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * setException causes get to throw ExecutionException |
| 301 | */ |
| 302 | public void testSetException_get() throws Exception { |
| 303 | Exception nse = new NoSuchElementException(); |
| 304 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 305 | task.setException(nse); |
| 306 | |
| 307 | try { |
| 308 | task.get(); |
| 309 | shouldThrow(); |
| 310 | } catch (ExecutionException success) { |
| 311 | assertSame(nse, success.getCause()); |
| 312 | checkCompletedAbnormally(task, nse); |
| 313 | } |
| 314 | |
| 315 | try { |
| 316 | task.get(LONG_DELAY_MS, MILLISECONDS); |
| 317 | shouldThrow(); |
| 318 | } catch (ExecutionException success) { |
| 319 | assertSame(nse, success.getCause()); |
| 320 | checkCompletedAbnormally(task, nse); |
| 321 | } |
| 322 | |
| 323 | assertEquals(1, task.setExceptionCount()); |
| 324 | assertEquals(0, task.setCount()); |
| 325 | tryToConfuseDoneTask(task); |
| 326 | checkCompletedAbnormally(task, nse); |
| 327 | assertEquals(0, task.runCount()); |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * cancel(false) before run succeeds |
| 332 | */ |
| 333 | public void testCancelBeforeRun() { |
| 334 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 335 | assertTrue(task.cancel(false)); |
| 336 | task.run(); |
| 337 | assertEquals(0, task.runCount()); |
| 338 | assertEquals(0, task.setCount()); |
| 339 | assertEquals(0, task.setExceptionCount()); |
| 340 | assertTrue(task.isCancelled()); |
| 341 | assertTrue(task.isDone()); |
| 342 | tryToConfuseDoneTask(task); |
| 343 | assertEquals(0, task.runCount()); |
| 344 | checkCancelled(task); |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * cancel(true) before run succeeds |
| 349 | */ |
| 350 | public void testCancelBeforeRun2() { |
| 351 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 352 | assertTrue(task.cancel(true)); |
| 353 | task.run(); |
| 354 | assertEquals(0, task.runCount()); |
| 355 | assertEquals(0, task.setCount()); |
| 356 | assertEquals(0, task.setExceptionCount()); |
| 357 | assertTrue(task.isCancelled()); |
| 358 | assertTrue(task.isDone()); |
| 359 | tryToConfuseDoneTask(task); |
| 360 | assertEquals(0, task.runCount()); |
| 361 | checkCancelled(task); |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * cancel(false) of a completed task fails |
| 366 | */ |
| 367 | public void testCancelAfterRun() { |
| 368 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 369 | task.run(); |
| 370 | assertFalse(task.cancel(false)); |
| 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) of a completed task fails |
| 381 | */ |
| 382 | public void testCancelAfterRun2() { |
| 383 | PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
| 384 | task.run(); |
| 385 | assertFalse(task.cancel(true)); |
| 386 | assertEquals(1, task.runCount()); |
| 387 | assertEquals(1, task.setCount()); |
| 388 | assertEquals(0, task.setExceptionCount()); |
| 389 | tryToConfuseDoneTask(task); |
| 390 | checkCompletedNormally(task, Boolean.TRUE); |
| 391 | assertEquals(1, task.runCount()); |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * cancel(true) interrupts a running task that subsequently succeeds |
| 396 | */ |
| 397 | public void testCancelInterrupt() { |
| 398 | final CountDownLatch pleaseCancel = new CountDownLatch(1); |
| 399 | final PublicFutureTask task = |
| 400 | new PublicFutureTask(new CheckedRunnable() { |
| 401 | public void realRun() { |
| 402 | pleaseCancel.countDown(); |
| 403 | try { |
| 404 | delay(LONG_DELAY_MS); |
| 405 | shouldThrow(); |
| 406 | } catch (InterruptedException success) {} |
| 407 | }}); |
| 408 | |
| 409 | Thread t = newStartedThread(task); |
| 410 | await(pleaseCancel); |
| 411 | assertTrue(task.cancel(true)); |
| 412 | assertTrue(task.isCancelled()); |
| 413 | assertTrue(task.isDone()); |
| 414 | awaitTermination(t); |
| 415 | assertEquals(1, task.runCount()); |
| 416 | assertEquals(1, task.setCount()); |
| 417 | assertEquals(0, task.setExceptionCount()); |
| 418 | tryToConfuseDoneTask(task); |
| 419 | checkCancelled(task); |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * cancel(true) tries to interrupt a running task, but |
| 424 | * Thread.interrupt throws (simulating a restrictive security |
| 425 | * manager) |
| 426 | */ |
| 427 | public void testCancelInterrupt_ThrowsSecurityException() { |
| 428 | final CountDownLatch pleaseCancel = new CountDownLatch(1); |
| 429 | final CountDownLatch cancelled = new CountDownLatch(1); |
| 430 | final PublicFutureTask task = |
| 431 | new PublicFutureTask(new CheckedRunnable() { |
| 432 | public void realRun() { |
| 433 | pleaseCancel.countDown(); |
| 434 | await(cancelled); |
| 435 | assertFalse(Thread.interrupted()); |
| 436 | }}); |
| 437 | |
| 438 | final Thread t = new Thread(task) { |
| 439 | // Simulate a restrictive security manager. |
| 440 | @Override public void interrupt() { |
| 441 | throw new SecurityException(); |
| 442 | }}; |
| 443 | t.setDaemon(true); |
| 444 | t.start(); |
| 445 | |
| 446 | await(pleaseCancel); |
| 447 | try { |
| 448 | task.cancel(true); |
| 449 | shouldThrow(); |
| 450 | } catch (SecurityException expected) {} |
| 451 | |
| 452 | // We failed to deliver the interrupt, but the world retains |
| 453 | // its sanity, as if we had done task.cancel(false) |
| 454 | assertTrue(task.isCancelled()); |
| 455 | assertTrue(task.isDone()); |
| 456 | assertEquals(1, task.runCount()); |
| 457 | assertEquals(1, task.doneCount()); |
| 458 | assertEquals(0, task.setCount()); |
| 459 | assertEquals(0, task.setExceptionCount()); |
| 460 | cancelled.countDown(); |
| 461 | awaitTermination(t); |
| 462 | assertEquals(1, task.setCount()); |
| 463 | assertEquals(0, task.setExceptionCount()); |
| 464 | tryToConfuseDoneTask(task); |
| 465 | checkCancelled(task); |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * cancel(true) interrupts a running task that subsequently throws |
| 470 | */ |
| 471 | public void testCancelInterrupt_taskFails() { |
| 472 | final CountDownLatch pleaseCancel = new CountDownLatch(1); |
| 473 | final PublicFutureTask task = |
| 474 | new PublicFutureTask(new Runnable() { |
| 475 | public void run() { |
| 476 | try { |
| 477 | pleaseCancel.countDown(); |
| 478 | delay(LONG_DELAY_MS); |
| 479 | threadShouldThrow(); |
| 480 | } catch (InterruptedException success) { |
| 481 | } catch (Throwable t) { threadUnexpectedException(t); } |
| 482 | throw new RuntimeException(); |
| 483 | }}); |
| 484 | |
| 485 | Thread t = newStartedThread(task); |
| 486 | await(pleaseCancel); |
| 487 | assertTrue(task.cancel(true)); |
| 488 | assertTrue(task.isCancelled()); |
| 489 | awaitTermination(t); |
| 490 | assertEquals(1, task.runCount()); |
| 491 | assertEquals(0, task.setCount()); |
| 492 | assertEquals(1, task.setExceptionCount()); |
| 493 | tryToConfuseDoneTask(task); |
| 494 | checkCancelled(task); |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * cancel(false) does not interrupt a running task |
| 499 | */ |
| 500 | public void testCancelNoInterrupt() { |
| 501 | final CountDownLatch pleaseCancel = new CountDownLatch(1); |
| 502 | final CountDownLatch cancelled = new CountDownLatch(1); |
| 503 | final PublicFutureTask task = |
| 504 | new PublicFutureTask(new CheckedCallable<Boolean>() { |
| 505 | public Boolean realCall() { |
| 506 | pleaseCancel.countDown(); |
| 507 | await(cancelled); |
| 508 | assertFalse(Thread.interrupted()); |
| 509 | return Boolean.TRUE; |
| 510 | }}); |
| 511 | |
| 512 | Thread t = newStartedThread(task); |
| 513 | await(pleaseCancel); |
| 514 | assertTrue(task.cancel(false)); |
| 515 | assertTrue(task.isCancelled()); |
| 516 | cancelled.countDown(); |
| 517 | awaitTermination(t); |
| 518 | assertEquals(1, task.runCount()); |
| 519 | assertEquals(1, task.setCount()); |
| 520 | assertEquals(0, task.setExceptionCount()); |
| 521 | tryToConfuseDoneTask(task); |
| 522 | checkCancelled(task); |
| 523 | } |
| 524 | |
| 525 | /** |
| 526 | * run in one thread causes get in another thread to retrieve value |
| 527 | */ |
| 528 | public void testGetRun() { |
| 529 | final CountDownLatch pleaseRun = new CountDownLatch(2); |
| 530 | |
| 531 | final PublicFutureTask task = |
| 532 | new PublicFutureTask(new CheckedCallable<Object>() { |
| 533 | public Object realCall() { |
| 534 | return two; |
| 535 | }}); |
| 536 | |
| 537 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 538 | public void realRun() throws Exception { |
| 539 | pleaseRun.countDown(); |
| 540 | assertSame(two, task.get()); |
| 541 | }}); |
| 542 | |
| 543 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 544 | public void realRun() throws Exception { |
| 545 | pleaseRun.countDown(); |
| 546 | assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
| 547 | }}); |
| 548 | |
| 549 | await(pleaseRun); |
| 550 | checkNotDone(task); |
| 551 | assertTrue(t1.isAlive()); |
| 552 | assertTrue(t2.isAlive()); |
| 553 | task.run(); |
| 554 | checkCompletedNormally(task, two); |
| 555 | assertEquals(1, task.runCount()); |
| 556 | assertEquals(1, task.setCount()); |
| 557 | assertEquals(0, task.setExceptionCount()); |
| 558 | awaitTermination(t1); |
| 559 | awaitTermination(t2); |
| 560 | tryToConfuseDoneTask(task); |
| 561 | checkCompletedNormally(task, two); |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * set in one thread causes get in another thread to retrieve value |
| 566 | */ |
| 567 | public void testGetSet() { |
| 568 | final CountDownLatch pleaseSet = new CountDownLatch(2); |
| 569 | |
| 570 | final PublicFutureTask task = |
| 571 | new PublicFutureTask(new CheckedCallable<Object>() { |
| 572 | public Object realCall() throws InterruptedException { |
| 573 | return two; |
| 574 | }}); |
| 575 | |
| 576 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 577 | public void realRun() throws Exception { |
| 578 | pleaseSet.countDown(); |
| 579 | assertSame(two, task.get()); |
| 580 | }}); |
| 581 | |
| 582 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 583 | public void realRun() throws Exception { |
| 584 | pleaseSet.countDown(); |
| 585 | assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
| 586 | }}); |
| 587 | |
| 588 | await(pleaseSet); |
| 589 | checkNotDone(task); |
| 590 | assertTrue(t1.isAlive()); |
| 591 | assertTrue(t2.isAlive()); |
| 592 | task.set(two); |
| 593 | assertEquals(0, task.runCount()); |
| 594 | assertEquals(1, task.setCount()); |
| 595 | assertEquals(0, task.setExceptionCount()); |
| 596 | tryToConfuseDoneTask(task); |
| 597 | checkCompletedNormally(task, two); |
| 598 | awaitTermination(t1); |
| 599 | awaitTermination(t2); |
| 600 | } |
| 601 | |
| 602 | /** |
| 603 | * Cancelling a task causes timed get in another thread to throw |
| 604 | * CancellationException |
| 605 | */ |
| 606 | public void testTimedGet_Cancellation() { |
| 607 | testTimedGet_Cancellation(false); |
| 608 | } |
| 609 | public void testTimedGet_Cancellation_interrupt() { |
| 610 | testTimedGet_Cancellation(true); |
| 611 | } |
| 612 | public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) { |
| 613 | final CountDownLatch pleaseCancel = new CountDownLatch(3); |
| 614 | final CountDownLatch cancelled = new CountDownLatch(1); |
| 615 | final Callable<Object> callable = |
| 616 | new CheckedCallable<Object>() { |
| 617 | public Object realCall() throws InterruptedException { |
| 618 | pleaseCancel.countDown(); |
| 619 | if (mayInterruptIfRunning) { |
| 620 | try { |
| 621 | delay(2*LONG_DELAY_MS); |
| 622 | } catch (InterruptedException success) {} |
| 623 | } else { |
| 624 | await(cancelled); |
| 625 | } |
| 626 | return two; |
| 627 | }}; |
| 628 | final PublicFutureTask task = new PublicFutureTask(callable); |
| 629 | |
| 630 | Thread t1 = new ThreadShouldThrow(CancellationException.class) { |
| 631 | public void realRun() throws Exception { |
| 632 | pleaseCancel.countDown(); |
| 633 | task.get(); |
| 634 | }}; |
| 635 | Thread t2 = new ThreadShouldThrow(CancellationException.class) { |
| 636 | public void realRun() throws Exception { |
| 637 | pleaseCancel.countDown(); |
| 638 | task.get(2*LONG_DELAY_MS, MILLISECONDS); |
| 639 | }}; |
| 640 | t1.start(); |
| 641 | t2.start(); |
| 642 | Thread t3 = newStartedThread(task); |
| 643 | await(pleaseCancel); |
| 644 | checkIsRunning(task); |
| 645 | task.cancel(mayInterruptIfRunning); |
| 646 | checkCancelled(task); |
| 647 | awaitTermination(t1); |
| 648 | awaitTermination(t2); |
| 649 | cancelled.countDown(); |
| 650 | awaitTermination(t3); |
| 651 | assertEquals(1, task.runCount()); |
| 652 | assertEquals(1, task.setCount()); |
| 653 | assertEquals(0, task.setExceptionCount()); |
| 654 | tryToConfuseDoneTask(task); |
| 655 | checkCancelled(task); |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * A runtime exception in task causes get to throw ExecutionException |
| 660 | */ |
| 661 | public void testGet_ExecutionException() throws InterruptedException { |
| 662 | final ArithmeticException e = new ArithmeticException(); |
| 663 | final PublicFutureTask task = new PublicFutureTask(new Callable() { |
| 664 | public Object call() { |
| 665 | throw e; |
| 666 | }}); |
| 667 | |
| 668 | task.run(); |
| 669 | assertEquals(1, task.runCount()); |
| 670 | assertEquals(0, task.setCount()); |
| 671 | assertEquals(1, task.setExceptionCount()); |
| 672 | try { |
| 673 | task.get(); |
| 674 | shouldThrow(); |
| 675 | } catch (ExecutionException success) { |
| 676 | assertSame(e, success.getCause()); |
| 677 | tryToConfuseDoneTask(task); |
| 678 | checkCompletedAbnormally(task, success.getCause()); |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | /** |
| 683 | * A runtime exception in task causes timed get to throw ExecutionException |
| 684 | */ |
| 685 | public void testTimedGet_ExecutionException2() throws Exception { |
| 686 | final ArithmeticException e = new ArithmeticException(); |
| 687 | final PublicFutureTask task = new PublicFutureTask(new Callable() { |
| 688 | public Object call() { |
| 689 | throw e; |
| 690 | }}); |
| 691 | |
| 692 | task.run(); |
| 693 | try { |
| 694 | task.get(LONG_DELAY_MS, MILLISECONDS); |
| 695 | shouldThrow(); |
| 696 | } catch (ExecutionException success) { |
| 697 | assertSame(e, success.getCause()); |
| 698 | tryToConfuseDoneTask(task); |
| 699 | checkCompletedAbnormally(task, success.getCause()); |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | /** |
| 704 | * get is interruptible |
| 705 | */ |
| 706 | public void testGet_interruptible() { |
| 707 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 708 | final FutureTask task = new FutureTask(new NoOpCallable()); |
| 709 | Thread t = newStartedThread(new CheckedRunnable() { |
| 710 | public void realRun() throws Exception { |
| 711 | Thread.currentThread().interrupt(); |
| 712 | try { |
| 713 | task.get(); |
| 714 | shouldThrow(); |
| 715 | } catch (InterruptedException success) {} |
| 716 | assertFalse(Thread.interrupted()); |
| 717 | |
| 718 | pleaseInterrupt.countDown(); |
| 719 | try { |
| 720 | task.get(); |
| 721 | shouldThrow(); |
| 722 | } catch (InterruptedException success) {} |
| 723 | assertFalse(Thread.interrupted()); |
| 724 | }}); |
| 725 | |
| 726 | await(pleaseInterrupt); |
| 727 | t.interrupt(); |
| 728 | awaitTermination(t); |
| 729 | checkNotDone(task); |
| 730 | } |
| 731 | |
| 732 | /** |
| 733 | * timed get is interruptible |
| 734 | */ |
| 735 | public void testTimedGet_interruptible() { |
| 736 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 737 | final FutureTask task = new FutureTask(new NoOpCallable()); |
| 738 | Thread t = newStartedThread(new CheckedRunnable() { |
| 739 | public void realRun() throws Exception { |
| 740 | Thread.currentThread().interrupt(); |
| 741 | try { |
| 742 | task.get(2*LONG_DELAY_MS, MILLISECONDS); |
| 743 | shouldThrow(); |
| 744 | } catch (InterruptedException success) {} |
| 745 | assertFalse(Thread.interrupted()); |
| 746 | |
| 747 | pleaseInterrupt.countDown(); |
| 748 | try { |
| 749 | task.get(2*LONG_DELAY_MS, MILLISECONDS); |
| 750 | shouldThrow(); |
| 751 | } catch (InterruptedException success) {} |
| 752 | assertFalse(Thread.interrupted()); |
| 753 | }}); |
| 754 | |
| 755 | await(pleaseInterrupt); |
| 756 | t.interrupt(); |
| 757 | awaitTermination(t); |
| 758 | checkNotDone(task); |
| 759 | } |
| 760 | |
| 761 | /** |
| 762 | * A timed out timed get throws TimeoutException |
| 763 | */ |
| 764 | public void testGet_TimeoutException() throws Exception { |
| 765 | FutureTask task = new FutureTask(new NoOpCallable()); |
| 766 | long startTime = System.nanoTime(); |
| 767 | try { |
| 768 | task.get(timeoutMillis(), MILLISECONDS); |
| 769 | shouldThrow(); |
| 770 | } catch (TimeoutException success) { |
| 771 | assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | /** |
| 776 | * timed get with null TimeUnit throws NullPointerException |
| 777 | */ |
| 778 | public void testGet_NullTimeUnit() throws Exception { |
| 779 | FutureTask task = new FutureTask(new NoOpCallable()); |
| 780 | long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE }; |
| 781 | |
| 782 | for (long timeout : timeouts) { |
| 783 | try { |
| 784 | task.get(timeout, null); |
| 785 | shouldThrow(); |
| 786 | } catch (NullPointerException success) {} |
| 787 | } |
| 788 | |
| 789 | task.run(); |
| 790 | |
| 791 | for (long timeout : timeouts) { |
| 792 | try { |
| 793 | task.get(timeout, null); |
| 794 | shouldThrow(); |
| 795 | } catch (NullPointerException success) {} |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | } |