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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 task that returns a result and may throw an exception. | ||
| 40 | * Implementors define a single method with no arguments called | ||
| 41 | * <tt>call</tt>. | ||
| 42 | * | ||
| 43 | * <p>The <tt>Callable</tt> interface is similar to {@link | ||
| 44 | * java.lang.Runnable}, in that both are designed for classes whose | ||
| 45 | * instances are potentially executed by another thread. A | ||
| 46 | * <tt>Runnable</tt>, however, does not return a result and cannot | ||
| 47 | * throw a checked exception. | ||
| 48 | * | ||
| 49 | * <p> The {@link Executors} class contains utility methods to | ||
| 50 | * convert from other common forms to <tt>Callable</tt> classes. | ||
| 51 | * | ||
| 52 | * @see Executor | ||
| 53 | * @since 1.5 | ||
| 54 | * @author Doug Lea | ||
| 55 | * @param <V> the result type of method <tt>call</tt> | ||
| 56 | */ | ||
| 57 | public interface Callable<V> { | ||
| 58 | /** | ||
| 59 | * Computes a result, or throws an exception if unable to do so. | ||
| 60 | * | ||
| 61 | * @return computed result | ||
| 62 | * @throws Exception if unable to compute a result | ||
| 63 | */ | ||
| 64 | V call() throws Exception; | ||
| 65 | } | ||