| 25 |
|
* <p>While this class inherits from {@link ThreadPoolExecutor}, a few |
| 26 |
|
* of the inherited tuning methods are not useful for it. In |
| 27 |
|
* particular, because it acts as a fixed-sized pool using |
| 28 |
< |
* <tt>corePoolSize</tt> threads and an unbounded queue, adjustments |
| 29 |
< |
* to <tt>maximumPoolSize</tt> have no useful effect. Additionally, it |
| 30 |
< |
* is almost never a good idea to set <tt>corePoolSize</tt> to zero or |
| 31 |
< |
* use <tt>allowCoreThreadTimeOut</tt> because this may leave the pool |
| 28 |
> |
* {@code corePoolSize} threads and an unbounded queue, adjustments |
| 29 |
> |
* to {@code maximumPoolSize} have no useful effect. Additionally, it |
| 30 |
> |
* is almost never a good idea to set {@code corePoolSize} to zero or |
| 31 |
> |
* use {@code allowCoreThreadTimeOut} because this may leave the pool |
| 32 |
|
* without threads to handle tasks once they become eligible to run. |
| 33 |
|
* |
| 34 |
< |
* <p><b>Extension notes:</b> This class overrides {@link |
| 35 |
< |
* AbstractExecutorService} <tt>submit</tt> methods to generate |
| 36 |
< |
* internal objects to control per-task delays and scheduling. To |
| 37 |
< |
* preserve functionality, any further overrides of these methods in |
| 34 |
> |
* <p><b>Extension notes:</b> This class overrides the |
| 35 |
> |
* {@link ThreadPoolExecutor#execute execute} and |
| 36 |
> |
* {@link AbstractExecutorService#submit(Runnable) submit} |
| 37 |
> |
* methods to generate internal {@link ScheduledFuture} objects to |
| 38 |
> |
* control per-task delays and scheduling. To preserve |
| 39 |
> |
* functionality, any further overrides of these methods in |
| 40 |
|
* subclasses must invoke superclass versions, which effectively |
| 41 |
< |
* disables additional task customization. However, this class |
| 41 |
> |
* disables additional task customization. However, this class |
| 42 |
|
* provides alternative protected extension method |
| 43 |
< |
* <tt>decorateTask</tt> (one version each for <tt>Runnable</tt> and |
| 44 |
< |
* <tt>Callable</tt>) that can be used to customize the concrete task |
| 45 |
< |
* types used to execute commands entered via <tt>execute</tt>, |
| 46 |
< |
* <tt>submit</tt>, <tt>schedule</tt>, <tt>scheduleAtFixedRate</tt>, |
| 47 |
< |
* and <tt>scheduleWithFixedDelay</tt>. By default, a |
| 48 |
< |
* <tt>ScheduledThreadPoolExecutor</tt> uses a task type extending |
| 43 |
> |
* {@code decorateTask} (one version each for {@code Runnable} and |
| 44 |
> |
* {@code Callable}) that can be used to customize the concrete task |
| 45 |
> |
* types used to execute commands entered via {@code execute}, |
| 46 |
> |
* {@code submit}, {@code schedule}, {@code scheduleAtFixedRate}, |
| 47 |
> |
* and {@code scheduleWithFixedDelay}. By default, a |
| 48 |
> |
* {@code ScheduledThreadPoolExecutor} uses a task type extending |
| 49 |
|
* {@link FutureTask}. However, this may be modified or replaced using |
| 50 |
|
* subclasses of the form: |
| 51 |
|
* |
| 52 |
< |
* <pre> |
| 52 |
> |
* <pre> {@code |
| 53 |
|
* public class CustomScheduledExecutor extends ScheduledThreadPoolExecutor { |
| 54 |
|
* |
| 55 |
< |
* static class CustomTask<V> implements RunnableScheduledFuture<V> { ... } |
| 55 |
> |
* static class CustomTask<V> implements RunnableScheduledFuture<V> { ... } |
| 56 |
|
* |
| 57 |
< |
* protected <V> RunnableScheduledFuture<V> decorateTask( |
| 58 |
< |
* Runnable r, RunnableScheduledFuture<V> task) { |
| 59 |
< |
* return new CustomTask<V>(r, task); |
| 57 |
> |
* protected <V> RunnableScheduledFuture<V> decorateTask( |
| 58 |
> |
* Runnable r, RunnableScheduledFuture<V> task) { |
| 59 |
> |
* return new CustomTask<V>(r, task); |
| 60 |
|
* } |
| 61 |
|
* |
| 62 |
< |
* protected <V> RunnableScheduledFuture<V> decorateTask( |
| 63 |
< |
* Callable<V> c, RunnableScheduledFuture<V> task) { |
| 64 |
< |
* return new CustomTask<V>(c, task); |
| 62 |
> |
* protected <V> RunnableScheduledFuture<V> decorateTask( |
| 63 |
> |
* Callable<V> c, RunnableScheduledFuture<V> task) { |
| 64 |
> |
* return new CustomTask<V>(c, task); |
| 65 |
|
* } |
| 66 |
|
* // ... add constructors, etc. |
| 67 |
< |
* } |
| 68 |
< |
* </pre> |
| 67 |
> |
* }}</pre> |
| 68 |
> |
* |
| 69 |
|
* @since 1.5 |
| 70 |
|
* @author Doug Lea |
| 71 |
|
*/ |
| 126 |
|
*/ |
| 127 |
|
private static final AtomicLong sequencer = new AtomicLong(0); |
| 128 |
|
|
| 127 |
– |
/** Base of nanosecond timings, to avoid wrapping */ |
| 128 |
– |
private static final long NANO_ORIGIN = System.nanoTime(); |
| 129 |
– |
|
| 129 |
|
/** |
| 130 |
< |
* Returns nanosecond time offset by origin |
| 130 |
> |
* Returns current nanosecond time. |
| 131 |
|
*/ |
| 132 |
|
final long now() { |
| 133 |
< |
return System.nanoTime() - NANO_ORIGIN; |
| 133 |
> |
return System.nanoTime(); |
| 134 |
|
} |
| 135 |
|
|
| 136 |
|
private class ScheduledFutureTask<V> |
| 213 |
|
} |
| 214 |
|
|
| 215 |
|
/** |
| 216 |
< |
* Sets the next time to run for a periodic task |
| 216 |
> |
* Sets the next time to run for a periodic task. |
| 217 |
|
*/ |
| 218 |
|
private void setNextRunTime() { |
| 219 |
|
long p = period; |
| 241 |
|
|
| 242 |
|
/** |
| 243 |
|
* Returns true if can run a task given current run state |
| 244 |
< |
* and run-after-shutdown parameters |
| 244 |
> |
* and run-after-shutdown parameters. |
| 245 |
> |
* |
| 246 |
|
* @param periodic true if this task periodic, false if delayed |
| 247 |
|
*/ |
| 248 |
|
boolean canRunInCurrentRunState(boolean periodic) { |
| 258 |
|
* prestart the thread to run the task because the task (probably) |
| 259 |
|
* shouldn't be run yet,) If the pool is shut down while the task |
| 260 |
|
* is being added, cancel and remove it if required by state and |
| 261 |
< |
* run-after-shutdown parameters |
| 261 |
> |
* run-after-shutdown parameters. |
| 262 |
> |
* |
| 263 |
|
* @param task the task |
| 264 |
|
*/ |
| 265 |
|
private void delayedExecute(RunnableScheduledFuture<?> task) { |
| 271 |
|
!canRunInCurrentRunState(task.isPeriodic()) && |
| 272 |
|
remove(task)) |
| 273 |
|
task.cancel(false); |
| 274 |
< |
prestartCoreThread(); |
| 274 |
> |
else |
| 275 |
> |
prestartCoreThread(); |
| 276 |
|
} |
| 277 |
|
} |
| 278 |
|
|
| 279 |
|
/** |
| 280 |
< |
* Requeues a periodic task unless current run state precludes |
| 281 |
< |
* it. Same idea as delayedExecute except drops task rather than |
| 282 |
< |
* rejecting. |
| 280 |
> |
* Requeues a periodic task unless current run state precludes it. |
| 281 |
> |
* Same idea as delayedExecute except drops task rather than rejecting. |
| 282 |
> |
* |
| 283 |
|
* @param task the task |
| 284 |
|
*/ |
| 285 |
|
void reExecutePeriodic(RunnableScheduledFuture<?> task) { |
| 287 |
|
super.getQueue().add(task); |
| 288 |
|
if (!canRunInCurrentRunState(true) && remove(task)) |
| 289 |
|
task.cancel(false); |
| 290 |
< |
prestartCoreThread(); |
| 290 |
> |
else |
| 291 |
> |
prestartCoreThread(); |
| 292 |
|
} |
| 293 |
|
} |
| 294 |
|
|
| 295 |
|
/** |
| 296 |
|
* Cancels and clears the queue of all tasks that should not be run |
| 297 |
< |
* due to shutdown policy. Invoked within super.shutdown. |
| 297 |
> |
* due to shutdown policy. Invoked within super.shutdown. |
| 298 |
|
*/ |
| 299 |
|
@Override void onShutdown() { |
| 300 |
|
BlockingQueue<Runnable> q = super.getQueue(); |
| 306 |
|
q.clear(); |
| 307 |
|
else { |
| 308 |
|
// Traverse snapshot to avoid iterator exceptions |
| 309 |
< |
Object[] entries = q.toArray(); |
| 307 |
< |
for (int i = 0; i < entries.length; ++i) { |
| 308 |
< |
Object e = entries[i]; |
| 309 |
> |
for (Object e : q.toArray()) { |
| 310 |
|
if (e instanceof RunnableScheduledFuture) { |
| 311 |
|
RunnableScheduledFuture<?> t = |
| 312 |
|
(RunnableScheduledFuture<?>)e; |
| 318 |
|
} |
| 319 |
|
} |
| 320 |
|
} |
| 321 |
+ |
tryTerminate(); |
| 322 |
|
} |
| 323 |
|
|
| 324 |
|
/** |
| 354 |
|
} |
| 355 |
|
|
| 356 |
|
/** |
| 357 |
< |
* Creates a new ScheduledThreadPoolExecutor with the given core |
| 358 |
< |
* pool size. |
| 357 |
> |
* Creates a new {@code ScheduledThreadPoolExecutor} with the |
| 358 |
> |
* given core pool size. |
| 359 |
|
* |
| 360 |
< |
* @param corePoolSize the number of threads to keep in the pool, |
| 361 |
< |
* even if they are idle, unless allowCoreThreadTimeOut is set |
| 362 |
< |
* @throws IllegalArgumentException if <tt>corePoolSize < 0</tt> |
| 360 |
> |
* @param corePoolSize the number of threads to keep in the pool, even |
| 361 |
> |
* if they are idle, unless {@code allowCoreThreadTimeOut} is set |
| 362 |
> |
* @throws IllegalArgumentException if {@code corePoolSize < 0} |
| 363 |
|
*/ |
| 364 |
|
public ScheduledThreadPoolExecutor(int corePoolSize) { |
| 365 |
|
super(corePoolSize, Integer.MAX_VALUE, 0, TimeUnit.NANOSECONDS, |
| 367 |
|
} |
| 368 |
|
|
| 369 |
|
/** |
| 370 |
< |
* Creates a new ScheduledThreadPoolExecutor with the given |
| 371 |
< |
* initial parameters. |
| 370 |
> |
* Creates a new {@code ScheduledThreadPoolExecutor} with the |
| 371 |
> |
* given initial parameters. |
| 372 |
|
* |
| 373 |
< |
* @param corePoolSize the number of threads to keep in the pool, |
| 374 |
< |
* even if they are idle, unless allowCoreThreadTimeOut is set |
| 373 |
> |
* @param corePoolSize the number of threads to keep in the pool, even |
| 374 |
> |
* if they are idle, unless {@code allowCoreThreadTimeOut} is set |
| 375 |
|
* @param threadFactory the factory to use when the executor |
| 376 |
< |
* creates a new thread |
| 377 |
< |
* @throws IllegalArgumentException if <tt>corePoolSize < 0</tt> |
| 378 |
< |
* @throws NullPointerException if threadFactory is null |
| 376 |
> |
* creates a new thread |
| 377 |
> |
* @throws IllegalArgumentException if {@code corePoolSize < 0} |
| 378 |
> |
* @throws NullPointerException if {@code threadFactory} is null |
| 379 |
|
*/ |
| 380 |
|
public ScheduledThreadPoolExecutor(int corePoolSize, |
| 381 |
|
ThreadFactory threadFactory) { |
| 387 |
|
* Creates a new ScheduledThreadPoolExecutor with the given |
| 388 |
|
* initial parameters. |
| 389 |
|
* |
| 390 |
< |
* @param corePoolSize the number of threads to keep in the pool, |
| 391 |
< |
* even if they are idle, unless allowCoreThreadTimeOut is set |
| 390 |
> |
* @param corePoolSize the number of threads to keep in the pool, even |
| 391 |
> |
* if they are idle, unless {@code allowCoreThreadTimeOut} is set |
| 392 |
|
* @param handler the handler to use when execution is blocked |
| 393 |
< |
* because the thread bounds and queue capacities are reached |
| 394 |
< |
* @throws IllegalArgumentException if <tt>corePoolSize < 0</tt> |
| 395 |
< |
* @throws NullPointerException if handler is null |
| 393 |
> |
* because the thread bounds and queue capacities are reached |
| 394 |
> |
* @throws IllegalArgumentException if {@code corePoolSize < 0} |
| 395 |
> |
* @throws NullPointerException if {@code handler} is null |
| 396 |
|
*/ |
| 397 |
|
public ScheduledThreadPoolExecutor(int corePoolSize, |
| 398 |
|
RejectedExecutionHandler handler) { |
| 404 |
|
* Creates a new ScheduledThreadPoolExecutor with the given |
| 405 |
|
* initial parameters. |
| 406 |
|
* |
| 407 |
< |
* @param corePoolSize the number of threads to keep in the pool, |
| 408 |
< |
* even if they are idle, unless allowCoreThreadTimeOut is set |
| 407 |
> |
* @param corePoolSize the number of threads to keep in the pool, even |
| 408 |
> |
* if they are idle, unless {@code allowCoreThreadTimeOut} is set |
| 409 |
|
* @param threadFactory the factory to use when the executor |
| 410 |
< |
* creates a new thread |
| 410 |
> |
* creates a new thread |
| 411 |
|
* @param handler the handler to use when execution is blocked |
| 412 |
< |
* because the thread bounds and queue capacities are reached. |
| 413 |
< |
* @throws IllegalArgumentException if <tt>corePoolSize < 0</tt> |
| 414 |
< |
* @throws NullPointerException if threadFactory or handler is null |
| 412 |
> |
* because the thread bounds and queue capacities are reached |
| 413 |
> |
* @throws IllegalArgumentException if {@code corePoolSize < 0} |
| 414 |
> |
* @throws NullPointerException if {@code threadFactory} or |
| 415 |
> |
* {@code handler} is null |
| 416 |
|
*/ |
| 417 |
|
public ScheduledThreadPoolExecutor(int corePoolSize, |
| 418 |
|
ThreadFactory threadFactory, |
| 504 |
|
} |
| 505 |
|
|
| 506 |
|
/** |
| 507 |
< |
* Executes command with zero required delay. This has effect |
| 508 |
< |
* equivalent to <tt>schedule(command, 0, anyUnit)</tt>. Note |
| 509 |
< |
* that inspections of the queue and of the list returned by |
| 510 |
< |
* <tt>shutdownNow</tt> will access the zero-delayed |
| 511 |
< |
* {@link ScheduledFuture}, not the <tt>command</tt> itself. |
| 507 |
> |
* Executes {@code command} with zero required delay. |
| 508 |
> |
* This has effect equivalent to |
| 509 |
> |
* {@link #schedule(Runnable,long,TimeUnit) schedule(command, 0, anyUnit)}. |
| 510 |
> |
* Note that inspections of the queue and of the list returned by |
| 511 |
> |
* {@code shutdownNow} will access the zero-delayed |
| 512 |
> |
* {@link ScheduledFuture}, not the {@code command} itself. |
| 513 |
> |
* |
| 514 |
> |
* <p>A consequence of the use of {@code ScheduledFuture} objects is |
| 515 |
> |
* that {@link ThreadPoolExecutor#afterExecute afterExecute} is always |
| 516 |
> |
* called with a null second {@code Throwable} argument, even if the |
| 517 |
> |
* {@code command} terminated abruptly. Instead, the {@code Throwable} |
| 518 |
> |
* thrown by such a task can be obtained via {@link Future#get}. |
| 519 |
|
* |
| 510 |
– |
* @param command the task to execute |
| 520 |
|
* @throws RejectedExecutionException at discretion of |
| 521 |
< |
* <tt>RejectedExecutionHandler</tt>, if task cannot be accepted |
| 522 |
< |
* for execution because the executor has been shut down. |
| 523 |
< |
* @throws NullPointerException if command is null |
| 521 |
> |
* {@code RejectedExecutionHandler}, if the task |
| 522 |
> |
* cannot be accepted for execution because the |
| 523 |
> |
* executor has been shut down |
| 524 |
> |
* @throws NullPointerException {@inheritDoc} |
| 525 |
|
*/ |
| 526 |
|
public void execute(Runnable command) { |
| 517 |
– |
if (command == null) |
| 518 |
– |
throw new NullPointerException(); |
| 527 |
|
schedule(command, 0, TimeUnit.NANOSECONDS); |
| 528 |
|
} |
| 529 |
|
|
| 556 |
|
|
| 557 |
|
/** |
| 558 |
|
* Sets the policy on whether to continue executing existing |
| 559 |
< |
* periodic tasks even when this executor has been |
| 560 |
< |
* <tt>shutdown</tt>. In this case, these tasks will only |
| 561 |
< |
* terminate upon <tt>shutdownNow</tt>, or after setting the |
| 562 |
< |
* policy to <tt>false</tt> when already shutdown. This value is |
| 563 |
< |
* by default false. |
| 559 |
> |
* periodic tasks even when this executor has been {@code shutdown}. |
| 560 |
> |
* In this case, these tasks will only terminate upon |
| 561 |
> |
* {@code shutdownNow} or after setting the policy to |
| 562 |
> |
* {@code false} when already shutdown. |
| 563 |
> |
* This value is by default {@code false}. |
| 564 |
|
* |
| 565 |
< |
* @param value if true, continue after shutdown, else don't. |
| 565 |
> |
* @param value if {@code true}, continue after shutdown, else don't. |
| 566 |
|
* @see #getContinueExistingPeriodicTasksAfterShutdownPolicy |
| 567 |
|
*/ |
| 568 |
|
public void setContinueExistingPeriodicTasksAfterShutdownPolicy(boolean value) { |
| 569 |
|
continueExistingPeriodicTasksAfterShutdown = value; |
| 570 |
< |
if (!value && isShutdown()) { |
| 570 |
> |
if (!value && isShutdown()) |
| 571 |
|
onShutdown(); |
| 564 |
– |
tryTerminate(); |
| 565 |
– |
} |
| 572 |
|
} |
| 573 |
|
|
| 574 |
|
/** |
| 575 |
|
* Gets the policy on whether to continue executing existing |
| 576 |
< |
* periodic tasks even when this executor has been |
| 577 |
< |
* <tt>shutdown</tt>. In this case, these tasks will only |
| 578 |
< |
* terminate upon <tt>shutdownNow</tt> or after setting the policy |
| 579 |
< |
* to <tt>false</tt> when already shutdown. This value is by |
| 580 |
< |
* default false. |
| 576 |
> |
* periodic tasks even when this executor has been {@code shutdown}. |
| 577 |
> |
* In this case, these tasks will only terminate upon |
| 578 |
> |
* {@code shutdownNow} or after setting the policy to |
| 579 |
> |
* {@code false} when already shutdown. |
| 580 |
> |
* This value is by default {@code false}. |
| 581 |
|
* |
| 582 |
< |
* @return true if will continue after shutdown |
| 582 |
> |
* @return {@code true} if will continue after shutdown |
| 583 |
|
* @see #setContinueExistingPeriodicTasksAfterShutdownPolicy |
| 584 |
|
*/ |
| 585 |
|
public boolean getContinueExistingPeriodicTasksAfterShutdownPolicy() { |
| 588 |
|
|
| 589 |
|
/** |
| 590 |
|
* Sets the policy on whether to execute existing delayed |
| 591 |
< |
* tasks even when this executor has been <tt>shutdown</tt>. In |
| 592 |
< |
* this case, these tasks will only terminate upon |
| 593 |
< |
* <tt>shutdownNow</tt>, or after setting the policy to |
| 594 |
< |
* <tt>false</tt> when already shutdown. This value is by default |
| 595 |
< |
* true. |
| 591 |
> |
* tasks even when this executor has been {@code shutdown}. |
| 592 |
> |
* In this case, these tasks will only terminate upon |
| 593 |
> |
* {@code shutdownNow}, or after setting the policy to |
| 594 |
> |
* {@code false} when already shutdown. |
| 595 |
> |
* This value is by default {@code true}. |
| 596 |
|
* |
| 597 |
< |
* @param value if true, execute after shutdown, else don't. |
| 597 |
> |
* @param value if {@code true}, execute after shutdown, else don't. |
| 598 |
|
* @see #getExecuteExistingDelayedTasksAfterShutdownPolicy |
| 599 |
|
*/ |
| 600 |
|
public void setExecuteExistingDelayedTasksAfterShutdownPolicy(boolean value) { |
| 601 |
|
executeExistingDelayedTasksAfterShutdown = value; |
| 602 |
< |
if (!value && isShutdown()) { |
| 602 |
> |
if (!value && isShutdown()) |
| 603 |
|
onShutdown(); |
| 598 |
– |
tryTerminate(); |
| 599 |
– |
} |
| 604 |
|
} |
| 605 |
|
|
| 606 |
|
/** |
| 607 |
|
* Gets the policy on whether to execute existing delayed |
| 608 |
< |
* tasks even when this executor has been <tt>shutdown</tt>. In |
| 609 |
< |
* this case, these tasks will only terminate upon |
| 610 |
< |
* <tt>shutdownNow</tt>, or after setting the policy to |
| 611 |
< |
* <tt>false</tt> when already shutdown. This value is by default |
| 612 |
< |
* true. |
| 608 |
> |
* tasks even when this executor has been {@code shutdown}. |
| 609 |
> |
* In this case, these tasks will only terminate upon |
| 610 |
> |
* {@code shutdownNow}, or after setting the policy to |
| 611 |
> |
* {@code false} when already shutdown. |
| 612 |
> |
* This value is by default {@code true}. |
| 613 |
|
* |
| 614 |
< |
* @return true if will execute after shutdown |
| 614 |
> |
* @return {@code true} if will execute after shutdown |
| 615 |
|
* @see #setExecuteExistingDelayedTasksAfterShutdownPolicy |
| 616 |
|
*/ |
| 617 |
|
public boolean getExecuteExistingDelayedTasksAfterShutdownPolicy() { |
| 620 |
|
|
| 621 |
|
/** |
| 622 |
|
* Initiates an orderly shutdown in which previously submitted |
| 623 |
< |
* tasks are executed, but no new tasks will be accepted. If the |
| 624 |
< |
* <tt>ExecuteExistingDelayedTasksAfterShutdownPolicy</tt> has |
| 625 |
< |
* been set <tt>false</tt>, existing delayed tasks whose delays |
| 626 |
< |
* have not yet elapsed are cancelled. And unless the |
| 627 |
< |
* <tt>ContinueExistingPeriodicTasksAfterShutdownPolicy</tt> has |
| 628 |
< |
* been set <tt>true</tt>, future executions of existing periodic |
| 623 |
> |
* tasks are executed, but no new tasks will be accepted. If the |
| 624 |
> |
* {@code ExecuteExistingDelayedTasksAfterShutdownPolicy} has |
| 625 |
> |
* been set {@code false}, existing delayed tasks whose delays |
| 626 |
> |
* have not yet elapsed are cancelled. And unless the |
| 627 |
> |
* {@code ContinueExistingPeriodicTasksAfterShutdownPolicy} has |
| 628 |
> |
* been set {@code true}, future executions of existing periodic |
| 629 |
|
* tasks will be cancelled. |
| 630 |
+ |
* |
| 631 |
+ |
* @throws SecurityException {@inheritDoc} |
| 632 |
|
*/ |
| 633 |
|
public void shutdown() { |
| 634 |
|
super.shutdown(); |
| 644 |
|
* cancels tasks via {@link Thread#interrupt}, so any task that |
| 645 |
|
* fails to respond to interrupts may never terminate. |
| 646 |
|
* |
| 647 |
< |
* @return list of tasks that never commenced execution. Each |
| 648 |
< |
* element of this list is a {@link ScheduledFuture}, |
| 649 |
< |
* including those tasks submitted using <tt>execute</tt>, which |
| 650 |
< |
* are for scheduling purposes used as the basis of a zero-delay |
| 651 |
< |
* <tt>ScheduledFuture</tt>. |
| 647 |
> |
* @return list of tasks that never commenced execution. |
| 648 |
> |
* Each element of this list is a {@link ScheduledFuture}, |
| 649 |
> |
* including those tasks submitted using {@code execute}, |
| 650 |
> |
* which are for scheduling purposes used as the basis of a |
| 651 |
> |
* zero-delay {@code ScheduledFuture}. |
| 652 |
|
* @throws SecurityException {@inheritDoc} |
| 653 |
|
*/ |
| 654 |
|
public List<Runnable> shutdownNow() { |
| 658 |
|
/** |
| 659 |
|
* Returns the task queue used by this executor. Each element of |
| 660 |
|
* this queue is a {@link ScheduledFuture}, including those |
| 661 |
< |
* tasks submitted using <tt>execute</tt> which are for scheduling |
| 661 |
> |
* tasks submitted using {@code execute} which are for scheduling |
| 662 |
|
* purposes used as the basis of a zero-delay |
| 663 |
< |
* <tt>ScheduledFuture</tt>. Iteration over this queue is |
| 663 |
> |
* {@code ScheduledFuture}. Iteration over this queue is |
| 664 |
|
* <em>not</em> guaranteed to traverse tasks in the order in |
| 665 |
|
* which they will execute. |
| 666 |
|
* |
