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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 | +} | |