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.util.*;

/**
 * Provides default implementation of {@link ExecutorService}
 * execution methods. This class implements the <tt>submit</tt>,
 * <tt>invokeAny</tt> and <tt>invokeAll</tt> methods using the default
 * {@link FutureTask} class 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 Future<?> submit(Runnable task) {
        if (task == null) throw new NullPointerException();
        FutureTask<Object> ftask = new FutureTask<Object>(task, null);
        execute(ftask);
        return ftask;
    }

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

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

    // 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(InterruptedException ie) {
                    throw ie;
                } 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(InterruptedException ie) {
                    throw ie;
                } 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(Collection<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(Collection<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:	1.14
Committed:	Mon Dec 22 00:48:14 2003 UTC (20 years, 5 months ago) by dl
Branch:	MAIN
Changes since 1.13:	+4 -0 lines
Log Message:	Streamline status settting
#	Content
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.*;
10
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,
16	* the the implementation of <tt>submit(Runnable)</tt> creates an
17	* associated <tt>FutureTask</tt> that is executed and
18	* returned. Subclasses overriding these methods to use different
19	* {@link Future} implementations should do so consistently for each
20	* of these methods.
21	*
22	* @since 1.5
23	* @author Doug Lea
24	*/
25	public abstract class AbstractExecutorService implements ExecutorService {
26
27	public Future<?> submit(Runnable task) {
28	if (task == null) throw new NullPointerException();
29	FutureTask<Object> ftask = new FutureTask<Object>(task, null);
30	execute(ftask);
31	return ftask;
32	}
33
34	public <T> Future<T> submit(Runnable task, T result) {
35	if (task == null) throw new NullPointerException();
36	FutureTask<T> ftask = new FutureTask<T>(task, result);
37	execute(ftask);
38	return ftask;
39	}
40
41	public <T> Future<T> submit(Callable<T> task) {
42	if (task == null) throw new NullPointerException();
43	FutureTask<T> ftask = new FutureTask<T>(task);
44	execute(ftask);
45	return ftask;
46	}
47
48	// any/all methods, each a little bit different than the other
49
50
51	public <T> T invokeAny(Collection<Callable<T>> tasks)
52	throws InterruptedException, ExecutionException {
53	if (tasks == null)
54	throw new NullPointerException();
55	int n = tasks.size();
56	if (n == 0)
57	throw new IllegalArgumentException();
58	List<Future<T>> futures= new ArrayList<Future<T>>(n);
59	ExecutorCompletionService<T> ecs =
60	new ExecutorCompletionService<T>(this);
61	try {
62	for (Callable<T> t : tasks)
63	futures.add(ecs.submit(t));
64	ExecutionException ee = null;
65	RuntimeException re = null;
66	while (n-- > 0) {
67	Future<T> f = ecs.take();
68	try {
69	return f.get();
70	} catch(InterruptedException ie) {
71	throw ie;
72	} catch(ExecutionException eex) {
73	ee = eex;
74	} catch(RuntimeException rex) {
75	re = rex;
76	}
77	}
78	if (ee != null)
79	throw ee;
80	if (re != null)
81	throw new ExecutionException(re);
82	throw new ExecutionException();
83	} finally {
84	for (Future<T> f : futures)
85	f.cancel(true);
86	}
87	}
88
89	public <T> T invokeAny(Collection<Callable<T>> tasks,
90	long timeout, TimeUnit unit)
91	throws InterruptedException, ExecutionException, TimeoutException {
92	if (tasks == null \|\| unit == null)
93	throw new NullPointerException();
94	long nanos = unit.toNanos(timeout);
95	int n = tasks.size();
96	if (n == 0)
97	throw new IllegalArgumentException();
98	List<Future<T>> futures= new ArrayList<Future<T>>(n);
99	ExecutorCompletionService<T> ecs =
100	new ExecutorCompletionService<T>(this);
101	try {
102	for (Callable<T> t : tasks)
103	futures.add(ecs.submit(t));
104	ExecutionException ee = null;
105	RuntimeException re = null;
106	long lastTime = System.nanoTime();
107	while (n-- > 0) {
108	Future<T> f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
109	if (f == null)
110	throw new TimeoutException();
111	try {
112	return f.get();
113	} catch(InterruptedException ie) {
114	throw ie;
115	} catch(ExecutionException eex) {
116	ee = eex;
117	} catch(RuntimeException rex) {
118	re = rex;
119	}
120	long now = System.nanoTime();
121	nanos -= now - lastTime;
122	lastTime = now;
123	}
124	if (ee != null)
125	throw ee;
126	if (re != null)
127	throw new ExecutionException(re);
128	throw new ExecutionException();
129	} finally {
130	for (Future<T> f : futures)
131	f.cancel(true);
132	}
133	}
134
135	public <T> List<Future<T>> invokeAll(Collection<Callable<T>> tasks)
136	throws InterruptedException {
137	if (tasks == null)
138	throw new NullPointerException();
139	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
140	boolean done = false;
141	try {
142	for (Callable<T> t : tasks) {
143	FutureTask<T> f = new FutureTask<T>(t);
144	futures.add(f);
145	execute(f);
146	}
147	for (Future<T> f : futures) {
148	if (!f.isDone()) {
149	try {
150	f.get();
151	} catch(CancellationException ignore) {
152	} catch(ExecutionException ignore) {
153	}
154	}
155	}
156	done = true;
157	return futures;
158	} finally {
159	if (!done)
160	for (Future<T> f : futures)
161	f.cancel(true);
162	}
163	}
164
165	public <T> List<Future<T>> invokeAll(Collection<Callable<T>> tasks,
166	long timeout, TimeUnit unit)
167	throws InterruptedException {
168	if (tasks == null \|\| unit == null)
169	throw new NullPointerException();
170	long nanos = unit.toNanos(timeout);
171	List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
172	boolean done = false;
173	try {
174	for (Callable<T> t : tasks) {
175	FutureTask<T> f = new FutureTask<T>(t);
176	futures.add(f);
177	execute(f);
178	}
179	long lastTime = System.nanoTime();
180	for (Future<T> f : futures) {
181	if (!f.isDone()) {
182	if (nanos < 0)
183	return futures;
184	try {
185	f.get(nanos, TimeUnit.NANOSECONDS);
186	} catch(CancellationException ignore) {
187	} catch(ExecutionException ignore) {
188	} catch(TimeoutException toe) {
189	return futures;
190	}
191	long now = System.nanoTime();
192	nanos -= now - lastTime;
193	lastTime = now;
194	}
195	}
196	done = true;
197	return futures;
198	} finally {
199	if (!done)
200	for (Future<T> f : futures)
201	f.cancel(true);
202	}
203	}
204
205	}