| 1 |
/* |
| 2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 |
* Expert Group and released to the public domain. Use, modify, and |
| 4 |
* redistribute this code in any way without acknowledgement. |
| 5 |
*/ |
| 6 |
|
| 7 |
package java.util.concurrent; |
| 8 |
|
| 9 |
import java.security.AccessControlContext; |
| 10 |
import java.security.AccessController; |
| 11 |
import java.security.PrivilegedAction; |
| 12 |
import java.security.PrivilegedExceptionAction; |
| 13 |
import java.util.List; |
| 14 |
|
| 15 |
/** |
| 16 |
* Provides default implementation of {@link ExecutorService} |
| 17 |
* execution methods. This class implements the <tt>submit</tt> and |
| 18 |
* <tt>invoke</tt> methods using the default {@link FutureTask} and |
| 19 |
* {@link PrivilegedFutureTask} classes provided in this package. For |
| 20 |
* example, the the implementation of <tt>submit(Runnable)</tt> |
| 21 |
* creates an associated <tt>FutureTask</tt> that is executed and |
| 22 |
* returned. Subclasses overriding these methods to use different |
| 23 |
* {@link Future} implementations should do so consistently for each |
| 24 |
* of these methods. |
| 25 |
* |
| 26 |
* @since 1.5 |
| 27 |
* @author Doug Lea |
| 28 |
*/ |
| 29 |
public abstract class AbstractExecutorService implements ExecutorService { |
| 30 |
|
| 31 |
public Future<?> submit(Runnable task) { |
| 32 |
FutureTask<?> ftask = new FutureTask<Boolean>(task, Boolean.TRUE); |
| 33 |
execute(ftask); |
| 34 |
return ftask; |
| 35 |
} |
| 36 |
|
| 37 |
public <T> Future<T> submit(Callable<T> task) { |
| 38 |
FutureTask<T> ftask = new FutureTask<T>(task); |
| 39 |
execute(ftask); |
| 40 |
return ftask; |
| 41 |
} |
| 42 |
|
| 43 |
public void invoke(Runnable task) throws ExecutionException, InterruptedException { |
| 44 |
FutureTask<?> ftask = new FutureTask<Boolean>(task, Boolean.TRUE); |
| 45 |
execute(ftask); |
| 46 |
ftask.get(); |
| 47 |
} |
| 48 |
|
| 49 |
public <T> T invoke(Callable<T> task) throws ExecutionException, InterruptedException { |
| 50 |
FutureTask<T> ftask = new FutureTask<T>(task); |
| 51 |
execute(ftask); |
| 52 |
return ftask.get(); |
| 53 |
} |
| 54 |
|
| 55 |
public Future<Object> submit(PrivilegedAction action) { |
| 56 |
Callable<Object> task = new PrivilegedActionAdapter(action); |
| 57 |
FutureTask<Object> future = new PrivilegedFutureTask<Object>(task); |
| 58 |
execute(future); |
| 59 |
return future; |
| 60 |
} |
| 61 |
|
| 62 |
public Future<Object> submit(PrivilegedExceptionAction action) { |
| 63 |
Callable<Object> task = new PrivilegedExceptionActionAdapter(action); |
| 64 |
FutureTask<Object> future = new PrivilegedFutureTask<Object>(task); |
| 65 |
execute(future); |
| 66 |
return future; |
| 67 |
} |
| 68 |
|
| 69 |
private static class PrivilegedActionAdapter implements Callable<Object> { |
| 70 |
PrivilegedActionAdapter(PrivilegedAction action) { |
| 71 |
this.action = action; |
| 72 |
} |
| 73 |
public Object call () { |
| 74 |
return action.run(); |
| 75 |
} |
| 76 |
private final PrivilegedAction action; |
| 77 |
} |
| 78 |
|
| 79 |
private static class PrivilegedExceptionActionAdapter implements Callable<Object> { |
| 80 |
PrivilegedExceptionActionAdapter(PrivilegedExceptionAction action) { |
| 81 |
this.action = action; |
| 82 |
} |
| 83 |
public Object call () throws Exception { |
| 84 |
return action.run(); |
| 85 |
} |
| 86 |
private final PrivilegedExceptionAction action; |
| 87 |
} |
| 88 |
} |
