| 87 |
|
* exception (in which case {@link #getException} returns the |
| 88 |
|
* exception); {@link #isCancelled} is true if the task was cancelled |
| 89 |
|
* (in which case {@link #getException} returns a {@link |
| 90 |
< |
* java.util.concurrent.CancellationException}; and {@link |
| 90 |
> |
* java.util.concurrent.CancellationException}); and {@link |
| 91 |
|
* #isCompletedAbnormally} is true if a task was either cancelled or |
| 92 |
< |
* encountered an exception. |
| 92 |
> |
* encountered an exception. |
| 93 |
|
* |
| 94 |
|
* <p>The ForkJoinTask class is not usually directly subclassed. |
| 95 |
|
* Instead, you subclass one of the abstract classes that support a |
| 125 |
|
* improve throughput. If too small, then memory and internal task |
| 126 |
|
* maintenance overhead may overwhelm processing. |
| 127 |
|
* |
| 128 |
< |
* <p>This class provides {@code adapt} methods for {@link |
| 129 |
< |
* java.lang.Runnable} and {@link java.util.concurrent.Callable}, that |
| 130 |
< |
* may be of use when mixing execution of ForkJoinTasks with other |
| 131 |
< |
* kinds of tasks. When all tasks are of this form, consider using a |
| 132 |
< |
* pool in {@link ForkJoinPool#setAsyncMode async mode}. |
| 128 |
> |
* <p>This class provides {@code adapt} methods for {@link Runnable} |
| 129 |
> |
* and {@link Callable}, that may be of use when mixing execution of |
| 130 |
> |
* {@code ForkJoinTasks} with other kinds of tasks. When all tasks |
| 131 |
> |
* are of this form, consider using a pool in |
| 132 |
> |
* {@linkplain ForkJoinPool#setAsyncMode async mode}. |
| 133 |
|
* |
| 134 |
|
* <p>ForkJoinTasks are {@code Serializable}, which enables them to be |
| 135 |
|
* used in extensions such as remote execution frameworks. It is |
| 392 |
|
|
| 393 |
|
/** |
| 394 |
|
* Returns result or throws exception using j.u.c.Future conventions. |
| 395 |
< |
* Only call when {@code isDone} known to be true. |
| 395 |
> |
* Only call when {@code isDone} known to be true or thread known |
| 396 |
> |
* to be interrupted. |
| 397 |
|
*/ |
| 398 |
|
private V reportFutureResult() |
| 399 |
< |
throws ExecutionException, InterruptedException { |
| 399 |
> |
throws InterruptedException, ExecutionException { |
| 400 |
|
if (Thread.interrupted()) |
| 401 |
|
throw new InterruptedException(); |
| 402 |
|
int s = status & COMPLETION_MASK; |
| 422 |
|
int s = status & COMPLETION_MASK; |
| 423 |
|
if (s == NORMAL) |
| 424 |
|
return getRawResult(); |
| 425 |
< |
if (s == CANCELLED) |
| 425 |
> |
else if (s == CANCELLED) |
| 426 |
|
throw new CancellationException(); |
| 427 |
< |
if (s == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null) |
| 427 |
> |
else if (s == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null) |
| 428 |
|
throw new ExecutionException(ex); |
| 429 |
< |
throw new TimeoutException(); |
| 429 |
> |
else |
| 430 |
> |
throw new TimeoutException(); |
| 431 |
|
} |
| 432 |
|
|
| 433 |
|
// internal execution methods |
| 529 |
|
} |
| 530 |
|
|
| 531 |
|
/** |
| 532 |
< |
* Returns the result of the computation when it is ready. |
| 532 |
> |
* Returns the result of the computation when it {@link #isDone is done}. |
| 533 |
|
* This method differs from {@link #get()} in that |
| 534 |
|
* abnormal completion results in {@code RuntimeException} or |
| 535 |
|
* {@code Error}, not {@code ExecutionException}. |
| 560 |
|
/** |
| 561 |
|
* Forks the given tasks, returning when {@code isDone} holds for |
| 562 |
|
* each task or an (unchecked) exception is encountered, in which |
| 563 |
< |
* case the exception is rethrown. If more than one task |
| 564 |
< |
* encounters an exception, then this method throws any one of |
| 565 |
< |
* these exceptions. The individual status of each task may be |
| 563 |
> |
* case the exception is rethrown. If either task encounters an |
| 564 |
> |
* exception, the other one may be, but is not guaranteed to be, |
| 565 |
> |
* cancelled. If both tasks throw an exception, then this method |
| 566 |
> |
* throws one of them. The individual status of each task may be |
| 567 |
|
* checked using {@link #getException()} and related methods. |
| 568 |
|
* |
| 569 |
|
* <p>This method may be invoked only from within {@code |
| 726 |
|
return (status & COMPLETION_MASK) == CANCELLED; |
| 727 |
|
} |
| 728 |
|
|
| 726 |
– |
/** |
| 727 |
– |
* Returns {@code true} if the computation performed by this task |
| 728 |
– |
* has completed (or has been cancelled). |
| 729 |
– |
* |
| 730 |
– |
* @return {@code true} if this computation has completed |
| 731 |
– |
*/ |
| 729 |
|
public final boolean isDone() { |
| 730 |
|
return status < 0; |
| 731 |
|
} |
| 732 |
|
|
| 736 |
– |
/** |
| 737 |
– |
* Returns {@code true} if this task was cancelled. |
| 738 |
– |
* |
| 739 |
– |
* @return {@code true} if this task was cancelled |
| 740 |
– |
*/ |
| 733 |
|
public final boolean isCancelled() { |
| 734 |
|
return (status & COMPLETION_MASK) == CANCELLED; |
| 735 |
|
} |
| 772 |
|
*/ |
| 773 |
|
public final Throwable getException() { |
| 774 |
|
int s = status & COMPLETION_MASK; |
| 775 |
< |
if (s >= NORMAL) |
| 776 |
< |
return null; |
| 777 |
< |
if (s == CANCELLED) |
| 786 |
< |
return new CancellationException(); |
| 787 |
< |
return exceptionMap.get(this); |
| 775 |
> |
return ((s >= NORMAL) ? null : |
| 776 |
> |
(s == CANCELLED) ? new CancellationException() : |
| 777 |
> |
exceptionMap.get(this)); |
| 778 |
|
} |
| 779 |
|
|
| 780 |
|
/** |
| 836 |
|
} |
| 837 |
|
|
| 838 |
|
/** |
| 839 |
< |
* Possibly executes other tasks until this task is ready, then |
| 840 |
< |
* returns the result of the computation. This method may be more |
| 841 |
< |
* efficient than {@code join}, but is only applicable when |
| 842 |
< |
* there are no potential dependencies between continuation of the |
| 843 |
< |
* current task and that of any other task that might be executed |
| 844 |
< |
* while helping. (This usually holds for pure divide-and-conquer |
| 845 |
< |
* tasks). |
| 839 |
> |
* Possibly executes other tasks until this task {@link #isDone is |
| 840 |
> |
* done}, then returns the result of the computation. This method |
| 841 |
> |
* may be more efficient than {@code join}, but is only applicable |
| 842 |
> |
* when there are no potential dependencies between continuation |
| 843 |
> |
* of the current task and that of any other task that might be |
| 844 |
> |
* executed while helping. (This usually holds for pure |
| 845 |
> |
* divide-and-conquer tasks). |
| 846 |
|
* |
| 847 |
|
* <p>This method may be invoked only from within {@code |
| 848 |
|
* ForkJoinTask} computations (as may be determined using method |
| 860 |
|
} |
| 861 |
|
|
| 862 |
|
/** |
| 863 |
< |
* Possibly executes other tasks until this task is ready. This |
| 864 |
< |
* method may be useful when processing collections of tasks when |
| 865 |
< |
* some have been cancelled or otherwise known to have aborted. |
| 863 |
> |
* Possibly executes other tasks until this task {@link #isDone is |
| 864 |
> |
* done}. This method may be useful when processing collections |
| 865 |
> |
* of tasks when some have been cancelled or otherwise known to |
| 866 |
> |
* have aborted. |
| 867 |
|
* |
| 868 |
|
* <p>This method may be invoked only from within {@code |
| 869 |
|
* ForkJoinTask} computations (as may be determined using method |
