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/*
 * %W% %E%
 *
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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;
}