| 11 |
|
/** |
| 12 |
|
* Provides default implementation of {@link ExecutorService} |
| 13 |
|
* execution methods. This class implements the <tt>submit</tt>, |
| 14 |
< |
* <tt>invokeAny</tt> and <tt>invokeAll</tt> methods using the default |
| 15 |
< |
* {@link FutureTask} class provided in this package. For example, |
| 14 |
> |
* <tt>invokeAny</tt> and <tt>invokeAll</tt> methods using a |
| 15 |
> |
* {@link RunnableFuture} returned by <tt>newTaskFor</tt>, which defaults |
| 16 |
> |
* to the {@link FutureTask} class provided in this package. For example, |
| 17 |
|
* the implementation of <tt>submit(Runnable)</tt> creates an |
| 18 |
< |
* associated <tt>FutureTask</tt> that is executed and |
| 19 |
< |
* returned. Subclasses overriding these methods to use different |
| 20 |
< |
* {@link Future} implementations should do so consistently for each |
| 21 |
< |
* of these methods. |
| 18 |
> |
* associated <tt>RunnableFuture</tt> that is executed and |
| 19 |
> |
* returned. Subclasses may override the <tt>newTaskFor</tt> methods |
| 20 |
> |
* to return other <tt>RunnableFuture</tt> implementations than |
| 21 |
> |
* <tt>FutureTask</tt>. |
| 22 |
|
* |
| 23 |
|
* @since 1.5 |
| 24 |
|
* @author Doug Lea |
| 25 |
|
*/ |
| 26 |
|
public abstract class AbstractExecutorService implements ExecutorService { |
| 27 |
|
|
| 28 |
+ |
/** |
| 29 |
+ |
* Returns a <tt>RunnableFuture</tt> for the given runnable and default |
| 30 |
+ |
* value. |
| 31 |
+ |
* @param runnable the runnable task being wrapped |
| 32 |
+ |
* @param value the default value for the returned future |
| 33 |
+ |
* @return a RunnableFuture which when run will run the underlying |
| 34 |
+ |
* runnable and which, as a Future, will yield the given value as its result |
| 35 |
+ |
* and provide for cancellation of the underlying task. |
| 36 |
+ |
*/ |
| 37 |
+ |
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) { |
| 38 |
+ |
return new FutureTask<T>(runnable, value); |
| 39 |
+ |
} |
| 40 |
+ |
|
| 41 |
+ |
/** |
| 42 |
+ |
* Returns a <tt>RunnableFuture</tt> for the given callable task. |
| 43 |
+ |
* @param callable the callable task being wrapped |
| 44 |
+ |
* @return a RunnableFuture which when run will call the underlying |
| 45 |
+ |
* callable and which, as a Future, will yield the callable's result |
| 46 |
+ |
* as its result and provide for cancellation of the underlying task. |
| 47 |
+ |
*/ |
| 48 |
+ |
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) { |
| 49 |
+ |
return new FutureTask<T>(callable); |
| 50 |
+ |
} |
| 51 |
+ |
|
| 52 |
|
public Future<?> submit(Runnable task) { |
| 53 |
|
if (task == null) throw new NullPointerException(); |
| 54 |
< |
FutureTask<Object> ftask = new FutureTask<Object>(task, null); |
| 54 |
> |
RunnableFuture<Object> ftask = newTaskFor(task, null); |
| 55 |
|
execute(ftask); |
| 56 |
|
return ftask; |
| 57 |
|
} |
| 58 |
|
|
| 59 |
|
public <T> Future<T> submit(Runnable task, T result) { |
| 60 |
|
if (task == null) throw new NullPointerException(); |
| 61 |
< |
FutureTask<T> ftask = new FutureTask<T>(task, result); |
| 61 |
> |
RunnableFuture<T> ftask = newTaskFor(task, result); |
| 62 |
|
execute(ftask); |
| 63 |
|
return ftask; |
| 64 |
|
} |
| 65 |
|
|
| 66 |
|
public <T> Future<T> submit(Callable<T> task) { |
| 67 |
|
if (task == null) throw new NullPointerException(); |
| 68 |
< |
FutureTask<T> ftask = new FutureTask<T>(task); |
| 68 |
> |
RunnableFuture<T> ftask = newTaskFor(task); |
| 69 |
|
execute(ftask); |
| 70 |
|
return ftask; |
| 71 |
|
} |
| 172 |
|
boolean done = false; |
| 173 |
|
try { |
| 174 |
|
for (Callable<T> t : tasks) { |
| 175 |
< |
FutureTask<T> f = new FutureTask<T>(t); |
| 175 |
> |
RunnableFuture<T> f = newTaskFor(t); |
| 176 |
|
futures.add(f); |
| 177 |
|
execute(f); |
| 178 |
|
} |
| 204 |
|
boolean done = false; |
| 205 |
|
try { |
| 206 |
|
for (Callable<T> t : tasks) |
| 207 |
< |
futures.add(new FutureTask<T>(t)); |
| 207 |
> |
futures.add(newTaskFor(t)); |
| 208 |
|
|
| 209 |
|
long lastTime = System.nanoTime(); |
| 210 |
|
|
