| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| package java.util.concurrent; |
| |
| /** |
| * A task that returns a result and may throw an exception. |
| * Implementors define a single method with no arguments called |
| * {@code call}. |
| * |
| * <p>The {@code Callable} interface is similar to {@link |
| * java.lang.Runnable}, in that both are designed for classes whose |
| * instances are potentially executed by another thread. A |
| * {@code Runnable}, however, does not return a result and cannot |
| * throw a checked exception. |
| * |
| * <p>The {@link Executors} class contains utility methods to |
| * convert from other common forms to {@code Callable} classes. |
| * |
| * @see Executor |
| * @since 1.5 |
| * @author Doug Lea |
| * @param <V> the result type of method {@code call} |
| */ |
| @FunctionalInterface |
| public interface Callable<V> { |
| /** |
| * Computes a result, or throws an exception if unable to do so. |
| * |
| * @return computed result |
| * @throws Exception if unable to compute a result |
| */ |
| V call() throws Exception; |
| } |