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      */

    61     void rejectedExecution(Runnable r, ThreadPoolExecutor executor);

    62 }