util/concurrent/AbstractExecutorService.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.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.*;
import java.util.concurrent.locks.*;

/**
 * Provides default implementation of {@link ExecutorService}
 * execution methods. This class implements the <tt>submit</tt> and
 * <tt>invoke</tt> methods using the default {@link FutureTask} and
 * {@link PrivilegedFutureTask} classes provided in this package.  For
 * example, the the implementation of <tt>submit(Runnable)</tt>
 * creates an associated <tt>FutureTask</tt> that is executed and
 * returned. Subclasses overriding these methods to use different
 * {@link Future} implementations should do so consistently for each
 * of these methods.
 *
 * @since 1.5
 * @author Doug Lea
 */
public abstract class AbstractExecutorService implements ExecutorService {

    public <T> Future<T> submit(Runnable task, T result) {
        FutureTask<T> ftask = new FutureTask<T>(task, result);
        execute(ftask);
        return ftask;
    }

    public <T> Future<T> submit(Callable<T> task) {
        FutureTask<T> ftask = new FutureTask<T>(task);
        execute(ftask);
        return ftask;
    }

    public void invoke(Runnable task) throws ExecutionException, InterruptedException {
        FutureTask<?> ftask = new FutureTask<Boolean>(task, Boolean.TRUE);
        execute(ftask);
        ftask.get();
    }

    public <T> T invoke(Callable<T> task) throws ExecutionException, InterruptedException {
        FutureTask<T> ftask = new FutureTask<T>(task);
        execute(ftask);
        return ftask.get();
    }

    public Future<Object> submit(PrivilegedAction action) {
        Callable<Object> task = new PrivilegedActionAdapter(action);
        FutureTask<Object> future = new PrivilegedFutureTask<Object>(task);
        execute(future);
        return future;
    }

    public Future<Object> submit(PrivilegedExceptionAction action) {
        Callable<Object> task = new PrivilegedExceptionActionAdapter(action);
        FutureTask<Object> future = new PrivilegedFutureTask<Object>(task);
        execute(future);
        return future;
    }

    private static class PrivilegedActionAdapter implements Callable<Object> {
        PrivilegedActionAdapter(PrivilegedAction action) {
            this.action = action;
        }
        public Object call () {
            return action.run();
        }
        private final PrivilegedAction action;
    }
    
    private static class PrivilegedExceptionActionAdapter implements Callable<Object> {
        PrivilegedExceptionActionAdapter(PrivilegedExceptionAction action) {
            this.action = action;
        }
        public Object call () throws Exception {
            return action.run();
        }
        private final PrivilegedExceptionAction action;
    }

    // any/all methods, each a little bit different than the other


    public <T> T invokeAny(Collection<Callable<T>> tasks)
        throws InterruptedException, ExecutionException {
        if (tasks == null)
            throw new NullPointerException();
        int n = tasks.size();
        if (n == 0)
            throw new IllegalArgumentException();
        List<Future<T>> futures= new ArrayList<Future<T>>(n);
        ExecutorCompletionService<T> ecs = 
            new ExecutorCompletionService<T>(this);
        try {
            for (Callable<T> t : tasks) 
                futures.add(ecs.submit(t));
            ExecutionException ee = null;
            RuntimeException re = null;
            while (n-- > 0) {
                Future<T> f = ecs.take();
                try {
                    return f.get();
                } catch(ExecutionException eex) {
                    ee = eex;
                } catch(RuntimeException rex) {
                    re = rex;
                }
            }    
            if (ee != null)
                throw ee;
            if (re != null)
                throw new ExecutionException(re);
            throw new ExecutionException();
        } finally {
            for (Future<T> f : futures) 
                f.cancel(true);
        }
    }

    public <T> T invokeAny(Collection<Callable<T>> tasks, 
                           long timeout, TimeUnit unit) 
        throws InterruptedException, ExecutionException, TimeoutException {
        if (tasks == null || unit == null)
            throw new NullPointerException();
        long nanos = unit.toNanos(timeout);
        int n = tasks.size();
        if (n == 0)
            throw new IllegalArgumentException();
        List<Future<T>> futures= new ArrayList<Future<T>>(n);
        ExecutorCompletionService<T> ecs = 
            new ExecutorCompletionService<T>(this);
        try {
            for (Callable<T> t : tasks) 
                futures.add(ecs.submit(t));
            ExecutionException ee = null;
            RuntimeException re = null;
            long lastTime = System.nanoTime();
            while (n-- > 0) {
                Future<T> f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
                if (f == null)
                    throw new TimeoutException();
                try {
                    return f.get();
                } catch(ExecutionException eex) {
                    ee = eex;
                } catch(RuntimeException rex) {
                    re = rex;
                }
                long now = System.nanoTime();
                nanos -= now - lastTime;
                lastTime = now;
            }    
            if (ee != null)
                throw ee;
            if (re != null)
                throw new ExecutionException(re);
            throw new ExecutionException();
        } finally {
            for (Future<T> f : futures) 
                f.cancel(true);
        }
    }


    public <T> T invokeAny(Collection<Runnable> tasks, T result)
        throws InterruptedException, ExecutionException {
        if (tasks == null)
            throw new NullPointerException();
        int n = tasks.size();
        if (n == 0)
            throw new IllegalArgumentException();
        List<Future<T>> futures= new ArrayList<Future<T>>(n);
        ExecutorCompletionService<T> ecs = 
            new ExecutorCompletionService<T>(this);
        try {
            for (Runnable t : tasks) 
                futures.add(ecs.submit(t, result));
            ExecutionException ee = null;
            RuntimeException re = null;
            while (n-- > 0) {
                Future<T> f = ecs.take();
                try {
                    return f.get();
                } catch(ExecutionException eex) {
                    ee = eex;
                } catch(RuntimeException rex) {
                    re = rex;
                }
            }    
            if (ee != null)
                throw ee;
            if (re != null)
                throw new ExecutionException(re);
            throw new ExecutionException();
        } finally {
            for (Future<T> f : futures) 
                f.cancel(true);
        }
    }

    public <T> T invokeAny(Collection<Runnable> tasks, T result,
                           long timeout, TimeUnit unit) 
        throws InterruptedException, ExecutionException, TimeoutException {
        if (tasks == null || unit == null)
            throw new NullPointerException();
        long nanos = unit.toNanos(timeout);
        int n = tasks.size();
        if (n == 0)
            throw new IllegalArgumentException();
        List<Future<T>> futures= new ArrayList<Future<T>>(n);
        ExecutorCompletionService<T> ecs = 
            new ExecutorCompletionService<T>(this);
        try {
            for (Runnable t : tasks) 
                futures.add(ecs.submit(t, result));
            ExecutionException ee = null;
            RuntimeException re = null;
            long lastTime = System.nanoTime();
            while (n-- > 0) {
                Future<T> f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
                if (f == null)
                    throw new TimeoutException();
                try {
                    return f.get();
                } catch(ExecutionException eex) {
                    ee = eex;
                } catch(RuntimeException rex) {
                    re = rex;
                }
                long now = System.nanoTime();
                nanos -= now - lastTime;
                lastTime = now;
            }    
            if (ee != null)
                throw ee;
            if (re != null)
                throw new ExecutionException(re);
            throw new ExecutionException();
        } finally {
            for (Future<T> f : futures) 
                f.cancel(true);
        }
    }


    public <T> List<Future<T>> invokeAll(List<Runnable> tasks, T result)
        throws InterruptedException {
        if (tasks == null)
            throw new NullPointerException();
        List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
        boolean done = false;
        try {
            for (Runnable t : tasks) {
                FutureTask<T> f = new FutureTask<T>(t, result);
                futures.add(f);
                execute(f);
            }
            for (Future<T> f : futures) {
                if (!f.isDone()) {
                    try { 
                        f.get(); 
                    } catch(CancellationException ignore) {
                    } catch(ExecutionException ignore) {
                    }
                }
            }
            done = true;
            return futures;
        } finally {
            if (!done)
                for (Future<T> f : futures) 
                    f.cancel(true);
        }
    }

    public <T> List<Future<T>> invokeAll(List<Runnable> tasks, T result,
                                         long timeout, TimeUnit unit) 
        throws InterruptedException {
        if (tasks == null || unit == null)
            throw new NullPointerException();
        long nanos = unit.toNanos(timeout);
        List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
        boolean done = false;
        try {
            for (Runnable t : tasks) {
                FutureTask<T> f = new FutureTask<T>(t, result);
                futures.add(f);
                execute(f);
            }
            long lastTime = System.nanoTime();
            for (Future<T> f : futures) {
                if (!f.isDone()) {
                    if (nanos < 0) 
                        return futures;
                    try { 
                        f.get(nanos, TimeUnit.NANOSECONDS); 
                    } catch(CancellationException ignore) {
                    } catch(ExecutionException ignore) {
                    } catch(TimeoutException toe) {
                        return futures;
                    }
                    long now = System.nanoTime();
                    nanos -= now - lastTime;
                    lastTime = now;
                }
            }
            done = true;
            return futures;
        } finally {
            if (!done)
                for (Future<T> f : futures) 
                    f.cancel(true);
        }
    }

    public <T> List<Future<T>> invokeAll(List<Callable<T>> tasks)
        throws InterruptedException {
        if (tasks == null)
            throw new NullPointerException();
        List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
        boolean done = false;
        try {
            for (Callable<T> t : tasks) {
                FutureTask<T> f = new FutureTask<T>(t);
                futures.add(f);
                execute(f);
            }
            for (Future<T> f : futures) {
                if (!f.isDone()) {
                    try { 
                        f.get(); 
                    } catch(CancellationException ignore) {
                    } catch(ExecutionException ignore) {
                    }
                }
            }
            done = true;
            return futures;
        } finally {
            if (!done)
                for (Future<T> f : futures) 
                    f.cancel(true);
        }
    }

    public <T> List<Future<T>> invokeAll(List<Callable<T>> tasks, 
                                         long timeout, TimeUnit unit) 
        throws InterruptedException {
        if (tasks == null || unit == null)
            throw new NullPointerException();
        long nanos = unit.toNanos(timeout);
        List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
        boolean done = false;
        try {
            for (Callable<T> t : tasks) {
                FutureTask<T> f = new FutureTask<T>(t);
                futures.add(f);
                execute(f);
            }
            long lastTime = System.nanoTime();
            for (Future<T> f : futures) {
                if (!f.isDone()) {
                    if (nanos < 0) 
                        return futures; 
                    try { 
                        f.get(nanos, TimeUnit.NANOSECONDS); 
                    } catch(CancellationException ignore) {
                    } catch(ExecutionException ignore) {
                    } catch(TimeoutException toe) {
                        return futures;
                    }
                    long now = System.nanoTime();
                    nanos -= now - lastTime;
                    lastTime = now;
                }
            }
            done = true;
            return futures;
        } finally {
            if (!done)
                for (Future<T> f : futures) 
                    f.cancel(true);
        }
    }

}
Revision:	1.8
Committed:	Tue Dec 16 12:58:20 2003 UTC (20 years, 5 months ago) by dl
Branch:	MAIN
Changes since 1.7:	+16 -20 lines
Log Message:	Fix timeout control
#	User	Rev	Content
1	tim	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.security.AccessControlContext;
10			import java.security.AccessController;
11			import java.security.PrivilegedAction;
12			import java.security.PrivilegedExceptionAction;
13	dl	1.3	import java.util.*;
14			import java.util.concurrent.locks.*;
15	tim	1.1
16			/**
17	dl	1.2	* Provides default implementation of {@link ExecutorService}
18			* execution methods. This class implements the <tt>submit</tt> and
19			* <tt>invoke</tt> methods using the default {@link FutureTask} and
20			* {@link PrivilegedFutureTask} classes provided in this package. For
21			* example, the the implementation of <tt>submit(Runnable)</tt>
22			* creates an associated <tt>FutureTask</tt> that is executed and
23			* returned. Subclasses overriding these methods to use different
24			* {@link Future} implementations should do so consistently for each
25			* of these methods.
26	tim	1.1	*
27			* @since 1.5
28			* @author Doug Lea
29			*/
30			public abstract class AbstractExecutorService implements ExecutorService {
31
32	dl	1.6	public <T> Future<T> submit(Runnable task, T result) {
33			FutureTask<T> ftask = new FutureTask<T>(task, result);
34	tim	1.1	execute(ftask);
35			return ftask;
36			}
37
38			public <T> Future<T> submit(Callable<T> task) {
39			FutureTask<T> ftask = new FutureTask<T>(task);
40			execute(ftask);
41			return ftask;
42			}
43
44			public void invoke(Runnable task) throws ExecutionException, InterruptedException {
45			FutureTask<?> ftask = new FutureTask<Boolean>(task, Boolean.TRUE);
46			execute(ftask);
47			ftask.get();
48			}
49
50			public <T> T invoke(Callable<T> task) throws ExecutionException, InterruptedException {
51			FutureTask<T> ftask = new FutureTask<T>(task);
52			execute(ftask);
53			return ftask.get();
54			}
55
56			public Future<Object> submit(PrivilegedAction action) {
57			Callable<Object> task = new PrivilegedActionAdapter(action);
58			FutureTask<Object> future = new PrivilegedFutureTask<Object>(task);
59			execute(future);
60			return future;
61			}
62
63			public Future<Object> submit(PrivilegedExceptionAction action) {
64			Callable<Object> task = new PrivilegedExceptionActionAdapter(action);
65			FutureTask<Object> future = new PrivilegedFutureTask<Object>(task);
66			execute(future);
67			return future;
68			}
69
70			private static class PrivilegedActionAdapter implements Callable<Object> {
71			PrivilegedActionAdapter(PrivilegedAction action) {
72			this.action = action;
73			}
74			public Object call () {
75			return action.run();
76			}
77			private final PrivilegedAction action;
78			}
79
80			private static class PrivilegedExceptionActionAdapter implements Callable<Object> {
81			PrivilegedExceptionActionAdapter(PrivilegedExceptionAction action) {
82			this.action = action;
83			}
84			public Object call () throws Exception {
85			return action.run();
86			}
87			private final PrivilegedExceptionAction action;
88			}
89	dl	1.3
90	dl	1.7	// any/all methods, each a little bit different than the other
91	dl	1.3
92
93	dl	1.7	public <T> T invokeAny(Collection<Callable<T>> tasks)
94			throws InterruptedException, ExecutionException {
95	dl	1.3	if (tasks == null)
96			throw new NullPointerException();
97			int n = tasks.size();
98			if (n == 0)
99	dl	1.7	throw new IllegalArgumentException();
100			List<Future<T>> futures= new ArrayList<Future<T>>(n);
101			ExecutorCompletionService<T> ecs =
102			new ExecutorCompletionService<T>(this);
103	dl	1.3	try {
104	dl	1.7	for (Callable<T> t : tasks)
105			futures.add(ecs.submit(t));
106			ExecutionException ee = null;
107			RuntimeException re = null;
108			while (n-- > 0) {
109			Future<T> f = ecs.take();
110			try {
111			return f.get();
112			} catch(ExecutionException eex) {
113			ee = eex;
114			} catch(RuntimeException rex) {
115			re = rex;
116			}
117			}
118			if (ee != null)
119			throw ee;
120			if (re != null)
121			throw new ExecutionException(re);
122			throw new ExecutionException();
123	dl	1.3	} finally {
124	dl	1.6	for (Future<T> f : futures)
125	dl	1.4	f.cancel(true);
126	dl	1.3	}
127			}
128
129	dl	1.7	public <T> T invokeAny(Collection<Callable<T>> tasks,
130			long timeout, TimeUnit unit)
131			throws InterruptedException, ExecutionException, TimeoutException {
132	dl	1.3	if (tasks == null \|\| unit == null)
133			throw new NullPointerException();
134	dl	1.7	long nanos = unit.toNanos(timeout);
135	dl	1.3	int n = tasks.size();
136			if (n == 0)
137	dl	1.7	throw new IllegalArgumentException();
138			List<Future<T>> futures= new ArrayList<Future<T>>(n);
139			ExecutorCompletionService<T> ecs =
140			new ExecutorCompletionService<T>(this);
141	dl	1.3	try {
142	dl	1.7	for (Callable<T> t : tasks)
143			futures.add(ecs.submit(t));
144			ExecutionException ee = null;
145			RuntimeException re = null;
146			long lastTime = System.nanoTime();
147			while (n-- > 0) {
148			Future<T> f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
149	dl	1.8	if (f == null)
150			throw new TimeoutException();
151	dl	1.7	try {
152			return f.get();
153			} catch(ExecutionException eex) {
154			ee = eex;
155			} catch(RuntimeException rex) {
156			re = rex;
157			}
158	dl	1.8	long now = System.nanoTime();
159			nanos -= now - lastTime;
160			lastTime = now;
161	dl	1.7	}
162			if (ee != null)
163			throw ee;
164			if (re != null)
165			throw new ExecutionException(re);
166			throw new ExecutionException();
167	dl	1.3	} finally {
168	dl	1.6	for (Future<T> f : futures)
169	dl	1.4	f.cancel(true);
170	dl	1.3	}
171			}
172
173	dl	1.7
174			public <T> T invokeAny(Collection<Runnable> tasks, T result)
175			throws InterruptedException, ExecutionException {
176	dl	1.3	if (tasks == null)
177			throw new NullPointerException();
178			int n = tasks.size();
179			if (n == 0)
180	dl	1.7	throw new IllegalArgumentException();
181			List<Future<T>> futures= new ArrayList<Future<T>>(n);
182			ExecutorCompletionService<T> ecs =
183			new ExecutorCompletionService<T>(this);
184	dl	1.3	try {
185	dl	1.7	for (Runnable t : tasks)
186			futures.add(ecs.submit(t, result));
187			ExecutionException ee = null;
188			RuntimeException re = null;
189			while (n-- > 0) {
190			Future<T> f = ecs.take();
191			try {
192			return f.get();
193			} catch(ExecutionException eex) {
194			ee = eex;
195			} catch(RuntimeException rex) {
196			re = rex;
197			}
198			}
199			if (ee != null)
200			throw ee;
201			if (re != null)
202			throw new ExecutionException(re);
203			throw new ExecutionException();
204	dl	1.3	} finally {
205	dl	1.6	for (Future<T> f : futures)
206			f.cancel(true);
207	dl	1.3	}
208			}
209
210	dl	1.7	public <T> T invokeAny(Collection<Runnable> tasks, T result,
211			long timeout, TimeUnit unit)
212			throws InterruptedException, ExecutionException, TimeoutException {
213	dl	1.3	if (tasks == null \|\| unit == null)
214			throw new NullPointerException();
215	dl	1.7	long nanos = unit.toNanos(timeout);
216	dl	1.3	int n = tasks.size();
217	dl	1.7	if (n == 0)
218			throw new IllegalArgumentException();
219	dl	1.6	List<Future<T>> futures= new ArrayList<Future<T>>(n);
220	dl	1.7	ExecutorCompletionService<T> ecs =
221			new ExecutorCompletionService<T>(this);
222	dl	1.3	try {
223	dl	1.7	for (Runnable t : tasks)
224			futures.add(ecs.submit(t, result));
225			ExecutionException ee = null;
226			RuntimeException re = null;
227			long lastTime = System.nanoTime();
228			while (n-- > 0) {
229			Future<T> f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
230	dl	1.8	if (f == null)
231			throw new TimeoutException();
232	dl	1.7	try {
233			return f.get();
234			} catch(ExecutionException eex) {
235			ee = eex;
236			} catch(RuntimeException rex) {
237			re = rex;
238			}
239	dl	1.8	long now = System.nanoTime();
240			nanos -= now - lastTime;
241			lastTime = now;
242	dl	1.7	}
243			if (ee != null)
244			throw ee;
245			if (re != null)
246			throw new ExecutionException(re);
247			throw new ExecutionException();
248	dl	1.3	} finally {
249	dl	1.6	for (Future<T> f : futures)
250			f.cancel(true);
251	dl	1.3	}
252			}
253
254	dl	1.6
255			public <T> List<Future<T>> invokeAll(List<Runnable> tasks, T result)
256	dl	1.3	throws InterruptedException {
257			if (tasks == null)
258			throw new NullPointerException();
259	dl	1.6	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
260			boolean done = false;
261	dl	1.3	try {
262	dl	1.6	for (Runnable t : tasks) {
263			FutureTask<T> f = new FutureTask<T>(t, result);
264	dl	1.3	futures.add(f);
265	dl	1.6	execute(f);
266			}
267			for (Future<T> f : futures) {
268			if (!f.isDone()) {
269			try {
270			f.get();
271			} catch(CancellationException ignore) {
272			} catch(ExecutionException ignore) {
273			}
274			}
275	dl	1.3	}
276	dl	1.6	done = true;
277	dl	1.3	return futures;
278			} finally {
279	dl	1.6	if (!done)
280			for (Future<T> f : futures)
281			f.cancel(true);
282	dl	1.3	}
283			}
284
285	dl	1.6	public <T> List<Future<T>> invokeAll(List<Runnable> tasks, T result,
286			long timeout, TimeUnit unit)
287	dl	1.3	throws InterruptedException {
288			if (tasks == null \|\| unit == null)
289			throw new NullPointerException();
290			long nanos = unit.toNanos(timeout);
291	dl	1.6	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
292			boolean done = false;
293	dl	1.3	try {
294	dl	1.6	for (Runnable t : tasks) {
295			FutureTask<T> f = new FutureTask<T>(t, result);
296	dl	1.3	futures.add(f);
297	dl	1.6	execute(f);
298			}
299			long lastTime = System.nanoTime();
300			for (Future<T> f : futures) {
301			if (!f.isDone()) {
302			if (nanos < 0)
303			return futures;
304			try {
305			f.get(nanos, TimeUnit.NANOSECONDS);
306			} catch(CancellationException ignore) {
307			} catch(ExecutionException ignore) {
308			} catch(TimeoutException toe) {
309			return futures;
310			}
311	dl	1.8	long now = System.nanoTime();
312			nanos -= now - lastTime;
313			lastTime = now;
314	dl	1.6	}
315	dl	1.3	}
316	dl	1.6	done = true;
317	dl	1.3	return futures;
318			} finally {
319	dl	1.6	if (!done)
320			for (Future<T> f : futures)
321			f.cancel(true);
322	dl	1.3	}
323			}
324
325	dl	1.6	public <T> List<Future<T>> invokeAll(List<Callable<T>> tasks)
326	dl	1.3	throws InterruptedException {
327			if (tasks == null)
328			throw new NullPointerException();
329	dl	1.6	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
330			boolean done = false;
331	dl	1.3	try {
332			for (Callable<T> t : tasks) {
333	dl	1.6	FutureTask<T> f = new FutureTask<T>(t);
334	dl	1.3	futures.add(f);
335			execute(f);
336			}
337	dl	1.6	for (Future<T> f : futures) {
338			if (!f.isDone()) {
339			try {
340			f.get();
341			} catch(CancellationException ignore) {
342			} catch(ExecutionException ignore) {
343			}
344			}
345			}
346			done = true;
347	dl	1.3	return futures;
348			} finally {
349	dl	1.6	if (!done)
350	dl	1.4	for (Future<T> f : futures)
351			f.cancel(true);
352	dl	1.3	}
353			}
354
355	dl	1.6	public <T> List<Future<T>> invokeAll(List<Callable<T>> tasks,
356			long timeout, TimeUnit unit)
357	dl	1.3	throws InterruptedException {
358			if (tasks == null \|\| unit == null)
359			throw new NullPointerException();
360			long nanos = unit.toNanos(timeout);
361	dl	1.6	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
362			boolean done = false;
363	dl	1.3	try {
364			for (Callable<T> t : tasks) {
365	dl	1.6	FutureTask<T> f = new FutureTask<T>(t);
366	dl	1.3	futures.add(f);
367			execute(f);
368			}
369	dl	1.6	long lastTime = System.nanoTime();
370			for (Future<T> f : futures) {
371			if (!f.isDone()) {
372			if (nanos < 0)
373			return futures;
374			try {
375			f.get(nanos, TimeUnit.NANOSECONDS);
376			} catch(CancellationException ignore) {
377			} catch(ExecutionException ignore) {
378			} catch(TimeoutException toe) {
379			return futures;
380			}
381	dl	1.8	long now = System.nanoTime();
382			nanos -= now - lastTime;
383			lastTime = now;
384	dl	1.6	}
385			}
386			done = true;
387	dl	1.3	return futures;
388			} finally {
389	dl	1.6	if (!done)
390	dl	1.4	for (Future<T> f : futures)
391			f.cancel(true);
392	dl	1.3	}
393			}
394
395	tim	1.1	}