| 23 |
|
* |
| 24 |
|
* @since 1.5 |
| 25 |
|
* @author Doug Lea |
| 26 |
+ |
* @param <V> The result type returned by this Future |
| 27 |
|
*/ |
| 28 |
|
public class FutureTask<V> extends CancellableTask implements Future<V> { |
| 29 |
|
|
| 30 |
+ |
/** |
| 31 |
+ |
* Callable created in FutureTask(runnable, result) constructor |
| 32 |
+ |
*/ |
| 33 |
+ |
private static class RunnableAsCallable<V> implements Callable<V> { |
| 34 |
+ |
private final Runnable runnable; |
| 35 |
+ |
private final V result; |
| 36 |
+ |
RunnableAsCallable(Runnable runnable, V result) { |
| 37 |
+ |
this.runnable = runnable; |
| 38 |
+ |
this.result = result; |
| 39 |
+ |
} |
| 40 |
+ |
public V call() { |
| 41 |
+ |
runnable.run(); |
| 42 |
+ |
return result; |
| 43 |
+ |
} |
| 44 |
+ |
} |
| 45 |
+ |
|
| 46 |
|
/** |
| 47 |
|
* Constructs a <tt>FutureTask</tt> that will upon running, execute the |
| 48 |
|
* given <tt>Callable</tt>. |
| 74 |
|
if (runnable == null) |
| 75 |
|
throw new NullPointerException(); |
| 76 |
|
setRunnable(new InnerCancellableFuture<V> |
| 77 |
< |
(new Callable<V>() { |
| 61 |
< |
public V call() { |
| 62 |
< |
runnable.run(); |
| 63 |
< |
return result; |
| 64 |
< |
} |
| 65 |
< |
})); |
| 77 |
> |
(new RunnableAsCallable<V>(runnable, result))); |
| 78 |
|
} |
| 79 |
|
|
| 80 |
|
/** |
