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1 /*
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3  *
4  * This code is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 2 only, as
6  * published by the Free Software Foundation.  Oracle designates this
7  * particular file as subject to the "Classpath" exception as provided
8  * by Oracle in the LICENSE file that accompanied this code.
9  *
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * 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/publicdomain/zero/1.0/
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      */
rejectedExecution(Runnable r, ThreadPoolExecutor executor)61     void rejectedExecution(Runnable r, ThreadPoolExecutor executor);
62 }
63