01 /*
02 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
03 *
04 * This code is free software; you can redistribute it and/or modify it
05 * under the terms of the GNU General Public License version 2 only, as
06 * published by the Free Software Foundation. Sun designates this
07 * particular file as subject to the "Classpath" exception as provided
08 * by Sun in the LICENSE file that accompanied this code.
09 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 */
24
25 /*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * Written by Doug Lea with assistance from members of JCP JSR-166
32 * Expert Group and released to the public domain, as explained at
33 * http://creativecommons.org/licenses/publicdomain
34 */
35
36 package java.util.concurrent;
37
38 /**
39 * A handler for tasks that cannot be executed by a {@link ThreadPoolExecutor}.
40 *
41 * @since 1.5
42 * @author Doug Lea
43 */
44 public interface RejectedExecutionHandler {
45
46 /**
47 * Method that may be invoked by a {@link ThreadPoolExecutor} when
48 * {@link ThreadPoolExecutor#execute execute} cannot accept a
49 * task. This may occur when no more threads or queue slots are
50 * available because their bounds would be exceeded, or upon
51 * shutdown of the Executor.
52 *
53 * <p>In the absence of other alternatives, the method may throw
54 * an unchecked {@link RejectedExecutionException}, which will be
55 * propagated to the caller of {@code execute}.
56 *
57 * @param r the runnable task requested to be executed
58 * @param executor the executor attempting to execute this task
59 * @throws RejectedExecutionException if there is no remedy
60 */
61 void rejectedExecution(Runnable r, ThreadPoolExecutor executor);
62 }
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