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