java.util.concurrent.Callable Maven / Gradle / Ivy
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/*
* 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
* call.
*
* The 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
* Runnable, however, does not return a result and cannot
* throw a checked exception.
*
*
The {@link Executors} class contains utility methods to
* convert from other common forms to Callable classes.
*
* @see Executor
* @since 1.5
* @author Doug Lea
* @param the result type of method call
*/
public interface Callable {
/**
* 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;
}