util/concurrent/ExecutorService.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain. Use, modify, and
 * redistribute this code in any way without acknowledgement.
 */

package java.util.concurrent;

import java.util.List;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;

/**
 * An <tt>Executor</tt> that provides methods to manage termination
 * and those that can produce a {@link Future} for tracking
 * progress of one or more asynchronous tasks.
 * An <tt>ExecutorService</tt> can be shut down, which will cause it
 * to stop accepting new tasks.  After being shut down, the executor
 * will eventually terminate, at which point no tasks are actively
 * executing, no tasks are awaiting execution, and no new tasks can be
 * submitted.
 *
 * <p>The {@link Executors} class provides factory methods for the
 * executor services provided in this package.
 *
 * @since 1.5
 * @author Doug Lea
 */
public interface ExecutorService extends Executor {

    /**
     * Submits a Runnable task for execution and returns a Future 
     * representing that task.
     *
     * @param task the task to submit
     * @return a Future representing pending completion of the task,
     * and whose <tt>get()</tt> method will return an arbitrary value 
     * upon completion
     * @throws RejectedExecutionException if task cannot be scheduled
     * for execution
     */
    Future<?> submit(Runnable task);

    /**
     * Submits a value-returning task for execution and returns a Future
     * representing the pending results of the task.
     *
     * @param task the task to submit
     * @return a Future representing pending completion of the task
     * @throws RejectedExecutionException if task cannot be scheduled
     * for execution
     */
    <T> Future<T> submit(Callable<T> task);

    /**
     * Executes a Runnable task and blocks until it completes normally
     * or throws an exception.
     *
     * @param task the task to submit
     * @throws RejectedExecutionException if task cannot be scheduled
     * for execution
     * @throws ExecutionException if the task encountered an exception
     * while executing
     */
    void invoke(Runnable task) throws ExecutionException, InterruptedException;

    /**
     * Executes a value-returning task and blocks until it returns a
     * value or throws an exception.
     *
     * @param task the task to submit
     * @return a Future representing pending completion of the task
     * @throws RejectedExecutionException if task cannot be scheduled
     * for execution
     * @throws InterruptedException if interrupted while waiting for
     * completion
     * @throws ExecutionException if the task encountered an exception
     * while executing
     */
    <T> T invoke(Callable<T> task) throws ExecutionException, InterruptedException;


    /**
     * Submits a privileged action for execution under the current 
     * access control context and returns a Future representing the 
     * pending result object of that action.
     *
     * @param action the action to submit
     * @return a Future representing pending completion of the action
     * @throws RejectedExecutionException if action cannot be scheduled
     * for execution
     */
    Future<Object> submit(PrivilegedAction action);

    /**
     * Submits a privileged exception action for execution under the current 
     * access control context and returns a Future representing the pending 
     * result object of that action.
     *
     * @param action the action to submit
     * @return a Future representing pending completion of the action
     * @throws RejectedExecutionException if action cannot be scheduled
     * for execution
     */
    Future<Object> submit(PrivilegedExceptionAction action);
    

    /**
     * Initiates an orderly shutdown in which previously submitted
     * tasks are executed, but no new tasks will be
     * accepted. Invocation has no additional effect if already shut
     * down.
     *
     */
    void shutdown();

    /**
     * Attempts to stop all actively executing tasks, halts the
     * processing of waiting tasks, and returns a list of the tasks that were
     * awaiting execution. 
     *  
     * <p>There are no guarantees beyond best-effort attempts to stop
     * processing actively executing tasks.  For example, typical
     * implementations will cancel via {@link Thread#interrupt}, so if any
     * tasks mask or fail to respond to interrupts, they may never terminate.
     *
     * @return list of tasks that never commenced execution
     */
    List<Runnable> shutdownNow();

    /**
     * Returns <tt>true</tt> if this executor has been shut down.
     *
     * @return <tt>true</tt> if this executor has been shut down
     */
    boolean isShutdown();

    /**
     * Returns <tt>true</tt> if all tasks have completed following shut down.
     * Note that <tt>isTerminated</tt> is never <tt>true</tt> unless
     * either <tt>shutdown</tt> or <tt>shutdownNow</tt> was called first.
     *
     * @return <tt>true</tt> if all tasks have completed following shut down
     */
    boolean isTerminated();

    /**
     * Blocks until all tasks have completed execution after a shutdown
     * request, or the timeout occurs, or the current thread is
     * interrupted, whichever happens first.
     *
     * @param timeout the maximum time to wait
     * @param unit the time unit of the timeout argument
     * @return <tt>true</tt> if this executor terminated and <tt>false</tt>
     * if the timeout elapsed before termination
     * @throws InterruptedException if interrupted while waiting
     */
    boolean awaitTermination(long timeout, TimeUnit unit)
        throws InterruptedException;


    /**
     * Arranges for execution of the given tasks, returning when at
     * least one of them has completed. 
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the task list is
     * non-empty, at least one element of this list is known to have
     * completed. Other tasks may or may not have also completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    List<Future<?>> runAny(List<Runnable> tasks)
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning when at
     * least one of them has completed or the given timeout expires.
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @param timeout the maximum time to wait
     * @param unit the time unit of the timeout argument
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the task list is
     * non-empty and the operation did not time out, at least one
     * element of this list is known to have completed. Other tasks
     * may or may not have also completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    List<Future<?>> runAny(List<Runnable> tasks, 
                           long timeout, TimeUnit unit) 
        throws InterruptedException;


    /**
     * Arranges for execution of the given tasks, returning when
     * all of them complete. 
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list, each of which has
     * completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    List<Future<?>> runAll(List<Runnable> tasks)
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning normally
     * when all complete or the given timeout expires, whichever
     * happens first.
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @param timeout the maximum time to wait
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the operation did
     * not time out, each task will have completed. If it did time
     * out, some of these tasks will not have completed.
     * @param unit the time unit of the timeout argument
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    List<Future<?>> runAll(List<Runnable> tasks, 
                              long timeout, TimeUnit unit) 
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning when at
     * least one of them has completed. 
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the task list is
     * non-empty, at least one task on this list is known to have
     * completed. Other tasks may or may not have also completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */

    <T> List<Future<T>> callAny(List<Callable<T>> tasks)
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning when at
     * least one of them has completed or the given timeout expires.
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @param timeout the maximum time to wait
     * @param unit the time unit of the timeout argument
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the task list is
     * non-empty and the operation did not time out, at least one task
     * on this list is known to have completed. Other tasks may or may
     * not have also completed. If the operation timed out, none of
     * the tasks will have completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    <T> List<Future<T>> callAny(List<Callable<T>> tasks, 
                                long timeout, TimeUnit unit) 
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning their results
     * when all complete.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list, each of which has
     * completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */

    <T> List<Future<T>> callAll(List<Callable<T>> tasks)
        throws InterruptedException;

    /**
     * Arranges for execution of the given tasks, returning their results
     * when all complete or the timeout expires, whichever happens first.
     * Upon return, tasks that have not completed are cancelled.
     * Note that a <em>completed</em> task could have
     * terminated either normally or by throwing an exception.
     * @param tasks the collection of tasks
     * @param timeout the maximum time to wait
     * @param unit the time unit of the timeout argument
     * @return A list of Futures representing the tasks, in the same
     * sequential order as the given task list. If the operation did
     * not time out, each task will have completed. If it did time
     * out, some of thiese tasks will not have completed.
     * @throws InterruptedException if interrupted while waiting, in
     * which case unfinished tasks are cancelled.
     * @throws NullPointerException if tasks, any or its elements, or
     * unit are <tt>null</tt>
     * @throws RejectedExecutionException if any task cannot be scheduled
     * for execution
     */
    <T> List<Future<T>> callAll(List<Callable<T>> tasks, 
                                long timeout, TimeUnit unit) 
        throws InterruptedException;

}
Revision:	1.13
Committed:	Mon Dec 15 00:29:49 2003 UTC (20 years, 5 months ago) by dl
Branch:	MAIN
Changes since 1.12:	+65 -44 lines
Log Message:	Added CompletionService; Executor any/all methods now require lists
#	User	Rev	Content
1	dl	1.1	/*
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.util.List;
10	tim	1.8	import java.security.PrivilegedAction;
11			import java.security.PrivilegedExceptionAction;
12	dl	1.1
13			/**
14	dl	1.10	* An <tt>Executor</tt> that provides methods to manage termination
15			* and those that can produce a {@link Future} for tracking
16	dl	1.11	* progress of one or more asynchronous tasks.
17	dl	1.7	* An <tt>ExecutorService</tt> can be shut down, which will cause it
18			* to stop accepting new tasks. After being shut down, the executor
19			* will eventually terminate, at which point no tasks are actively
20	dl	1.1	* executing, no tasks are awaiting execution, and no new tasks can be
21			* submitted.
22			*
23	dl	1.7	* <p>The {@link Executors} class provides factory methods for the
24			* executor services provided in this package.
25	dl	1.1	*
26			* @since 1.5
27	dl	1.5	* @author Doug Lea
28	dl	1.1	*/
29			public interface ExecutorService extends Executor {
30	tim	1.8
31			/**
32			* Submits a Runnable task for execution and returns a Future
33			* representing that task.
34			*
35			* @param task the task to submit
36			* @return a Future representing pending completion of the task,
37			* and whose <tt>get()</tt> method will return an arbitrary value
38			* upon completion
39			* @throws RejectedExecutionException if task cannot be scheduled
40			* for execution
41			*/
42			Future<?> submit(Runnable task);
43
44			/**
45			* Submits a value-returning task for execution and returns a Future
46			* representing the pending results of the task.
47			*
48			* @param task the task to submit
49			* @return a Future representing pending completion of the task
50			* @throws RejectedExecutionException if task cannot be scheduled
51			* for execution
52			*/
53			<T> Future<T> submit(Callable<T> task);
54
55			/**
56			* Executes a Runnable task and blocks until it completes normally
57			* or throws an exception.
58			*
59			* @param task the task to submit
60			* @throws RejectedExecutionException if task cannot be scheduled
61			* for execution
62			* @throws ExecutionException if the task encountered an exception
63			* while executing
64			*/
65			void invoke(Runnable task) throws ExecutionException, InterruptedException;
66
67			/**
68			* Executes a value-returning task and blocks until it returns a
69			* value or throws an exception.
70			*
71			* @param task the task to submit
72			* @return a Future representing pending completion of the task
73			* @throws RejectedExecutionException if task cannot be scheduled
74			* for execution
75			* @throws InterruptedException if interrupted while waiting for
76			* completion
77			* @throws ExecutionException if the task encountered an exception
78			* while executing
79			*/
80			<T> T invoke(Callable<T> task) throws ExecutionException, InterruptedException;
81
82
83			/**
84			* Submits a privileged action for execution under the current
85			* access control context and returns a Future representing the
86			* pending result object of that action.
87			*
88			* @param action the action to submit
89			* @return a Future representing pending completion of the action
90			* @throws RejectedExecutionException if action cannot be scheduled
91			* for execution
92			*/
93			Future<Object> submit(PrivilegedAction action);
94
95			/**
96			* Submits a privileged exception action for execution under the current
97			* access control context and returns a Future representing the pending
98			* result object of that action.
99			*
100			* @param action the action to submit
101			* @return a Future representing pending completion of the action
102			* @throws RejectedExecutionException if action cannot be scheduled
103			* for execution
104			*/
105			Future<Object> submit(PrivilegedExceptionAction action);
106
107	dl	1.1
108			/**
109	dl	1.6	* Initiates an orderly shutdown in which previously submitted
110			* tasks are executed, but no new tasks will be
111			* accepted. Invocation has no additional effect if already shut
112			* down.
113	dl	1.1	*
114			*/
115			void shutdown();
116
117			/**
118			* Attempts to stop all actively executing tasks, halts the
119			* processing of waiting tasks, and returns a list of the tasks that were
120			* awaiting execution.
121			*
122			* <p>There are no guarantees beyond best-effort attempts to stop
123			* processing actively executing tasks. For example, typical
124			* implementations will cancel via {@link Thread#interrupt}, so if any
125			* tasks mask or fail to respond to interrupts, they may never terminate.
126			*
127			* @return list of tasks that never commenced execution
128			*/
129	tim	1.9	List<Runnable> shutdownNow();
130	dl	1.1
131			/**
132			* Returns <tt>true</tt> if this executor has been shut down.
133			*
134			* @return <tt>true</tt> if this executor has been shut down
135			*/
136			boolean isShutdown();
137
138			/**
139			* Returns <tt>true</tt> if all tasks have completed following shut down.
140			* Note that <tt>isTerminated</tt> is never <tt>true</tt> unless
141			* either <tt>shutdown</tt> or <tt>shutdownNow</tt> was called first.
142			*
143			* @return <tt>true</tt> if all tasks have completed following shut down
144			*/
145			boolean isTerminated();
146
147			/**
148			* Blocks until all tasks have completed execution after a shutdown
149			* request, or the timeout occurs, or the current thread is
150			* interrupted, whichever happens first.
151			*
152			* @param timeout the maximum time to wait
153			* @param unit the time unit of the timeout argument
154			* @return <tt>true</tt> if this executor terminated and <tt>false</tt>
155			* if the timeout elapsed before termination
156			* @throws InterruptedException if interrupted while waiting
157			*/
158			boolean awaitTermination(long timeout, TimeUnit unit)
159	dl	1.11	throws InterruptedException;
160
161
162			/**
163			* Arranges for execution of the given tasks, returning when at
164			* least one of them has completed.
165			* Upon return, tasks that have not completed are cancelled.
166	dl	1.12	* Note that a <em>completed</em> task could have
167			* terminated either normally or by throwing an exception.
168	dl	1.11	* @param tasks the collection of tasks
169	dl	1.13	* @return A list of Futures representing the tasks, in the same
170			* sequential order as the given task list. If the task list is
171			* non-empty, at least one element of this list is known to have
172			* completed. Other tasks may or may not have also completed.
173	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
174			* which case unfinished tasks are cancelled.
175	dl	1.13	* @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
176			* @throws RejectedExecutionException if any task cannot be scheduled
177			* for execution
178	dl	1.11	*/
179	dl	1.13	List<Future<?>> runAny(List<Runnable> tasks)
180	dl	1.11	throws InterruptedException;
181
182			/**
183			* Arranges for execution of the given tasks, returning when at
184			* least one of them has completed or the given timeout expires.
185			* Upon return, tasks that have not completed are cancelled.
186	dl	1.12	* Note that a <em>completed</em> task could have
187			* terminated either normally or by throwing an exception.
188	dl	1.11	* @param tasks the collection of tasks
189			* @param timeout the maximum time to wait
190			* @param unit the time unit of the timeout argument
191	dl	1.13	* @return A list of Futures representing the tasks, in the same
192			* sequential order as the given task list. If the task list is
193			* non-empty and the operation did not time out, at least one
194	dl	1.11	* element of this list is known to have completed. Other tasks
195	dl	1.13	* may or may not have also completed.
196	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
197			* which case unfinished tasks are cancelled.
198	dl	1.13	* @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
199			* @throws RejectedExecutionException if any task cannot be scheduled
200			* for execution
201	dl	1.11	*/
202	dl	1.13	List<Future<?>> runAny(List<Runnable> tasks,
203	dl	1.12	long timeout, TimeUnit unit)
204	dl	1.11	throws InterruptedException;
205
206
207			/**
208			* Arranges for execution of the given tasks, returning when
209			* all of them complete.
210	dl	1.12	* Note that a <em>completed</em> task could have
211			* terminated either normally or by throwing an exception.
212	dl	1.11	* @param tasks the collection of tasks
213	dl	1.13	* @return A list of Futures representing the tasks, in the same
214			* sequential order as the given task list, each of which has
215			* completed.
216	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
217			* which case unfinished tasks are cancelled.
218	dl	1.13	* @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
219			* @throws RejectedExecutionException if any task cannot be scheduled
220			* for execution
221	dl	1.11	*/
222	dl	1.13	List<Future<?>> runAll(List<Runnable> tasks)
223	dl	1.11	throws InterruptedException;
224
225			/**
226			* Arranges for execution of the given tasks, returning normally
227			* when all complete or the given timeout expires, whichever
228			* happens first.
229			* Upon return, tasks that have not completed are cancelled.
230	dl	1.12	* Note that a <em>completed</em> task could have
231			* terminated either normally or by throwing an exception.
232	dl	1.11	* @param tasks the collection of tasks
233			* @param timeout the maximum time to wait
234	dl	1.13	* @return A list of Futures representing the tasks, in the same
235			* sequential order as the given task list. If the operation did
236			* not time out, each task will have completed. If it did time
237			* out, some of these tasks will not have completed.
238	dl	1.11	* @param unit the time unit of the timeout argument
239			* @throws InterruptedException if interrupted while waiting, in
240			* which case unfinished tasks are cancelled.
241	dl	1.13	* @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
242			* @throws RejectedExecutionException if any task cannot be scheduled
243			* for execution
244	dl	1.11	*/
245	dl	1.13	List<Future<?>> runAll(List<Runnable> tasks,
246	dl	1.11	long timeout, TimeUnit unit)
247			throws InterruptedException;
248
249			/**
250			* Arranges for execution of the given tasks, returning when at
251			* least one of them has completed.
252			* Upon return, tasks that have not completed are cancelled.
253	dl	1.12	* Note that a <em>completed</em> task could have
254			* terminated either normally or by throwing an exception.
255	dl	1.11	* @param tasks the collection of tasks
256	dl	1.13	* @return A list of Futures representing the tasks, in the same
257			* sequential order as the given task list. If the task list is
258			* non-empty, at least one task on this list is known to have
259			* completed. Other tasks may or may not have also completed.
260	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
261			* which case unfinished tasks are cancelled.
262	dl	1.13	* @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
263			* @throws RejectedExecutionException if any task cannot be scheduled
264			* for execution
265	dl	1.11	*/
266
267	dl	1.13	<T> List<Future<T>> callAny(List<Callable<T>> tasks)
268	dl	1.11	throws InterruptedException;
269
270			/**
271			* Arranges for execution of the given tasks, returning when at
272			* least one of them has completed or the given timeout expires.
273			* Upon return, tasks that have not completed are cancelled.
274	dl	1.12	* Note that a <em>completed</em> task could have
275			* terminated either normally or by throwing an exception.
276	dl	1.11	* @param tasks the collection of tasks
277			* @param timeout the maximum time to wait
278			* @param unit the time unit of the timeout argument
279	dl	1.13	* @return A list of Futures representing the tasks, in the same
280			* sequential order as the given task list. If the task list is
281			* non-empty and the operation did not time out, at least one task
282			* on this list is known to have completed. Other tasks may or may
283			* not have also completed. If the operation timed out, none of
284			* the tasks will have completed.
285	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
286			* which case unfinished tasks are cancelled.
287	dl	1.13	* @throws NullPointerException if tasks, any or its elements, or unit are <tt>null</tt>
288			* @throws RejectedExecutionException if any task cannot be scheduled
289			* for execution
290	dl	1.11	*/
291	dl	1.13	<T> List<Future<T>> callAny(List<Callable<T>> tasks,
292	dl	1.12	long timeout, TimeUnit unit)
293	dl	1.11	throws InterruptedException;
294
295			/**
296			* Arranges for execution of the given tasks, returning their results
297			* when all complete.
298	dl	1.12	* Note that a <em>completed</em> task could have
299			* terminated either normally or by throwing an exception.
300	dl	1.11	* @param tasks the collection of tasks
301	dl	1.13	* @return A list of Futures representing the tasks, in the same
302			* sequential order as the given task list, each of which has
303			* completed.
304	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
305			* which case unfinished tasks are cancelled.
306	dl	1.13	* @throws NullPointerException if tasks or any of its elements are <tt>null</tt>
307			* @throws RejectedExecutionException if any task cannot be scheduled
308			* for execution
309	dl	1.11	*/
310
311	dl	1.13	<T> List<Future<T>> callAll(List<Callable<T>> tasks)
312	dl	1.11	throws InterruptedException;
313
314			/**
315			* Arranges for execution of the given tasks, returning their results
316			* when all complete or the timeout expires, whichever happens first.
317			* Upon return, tasks that have not completed are cancelled.
318	dl	1.12	* Note that a <em>completed</em> task could have
319			* terminated either normally or by throwing an exception.
320	dl	1.11	* @param tasks the collection of tasks
321			* @param timeout the maximum time to wait
322			* @param unit the time unit of the timeout argument
323	dl	1.13	* @return A list of Futures representing the tasks, in the same
324			* sequential order as the given task list. If the operation did
325			* not time out, each task will have completed. If it did time
326			* out, some of thiese tasks will not have completed.
327	dl	1.11	* @throws InterruptedException if interrupted while waiting, in
328			* which case unfinished tasks are cancelled.
329	dl	1.13	* @throws NullPointerException if tasks, any or its elements, or
330			* unit are <tt>null</tt>
331			* @throws RejectedExecutionException if any task cannot be scheduled
332			* for execution
333	dl	1.11	*/
334	dl	1.13	<T> List<Future<T>> callAll(List<Callable<T>> tasks,
335	dl	1.12	long timeout, TimeUnit unit)
336	dl	1.1	throws InterruptedException;
337	dl	1.3
338	dl	1.1	}