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/* 
 Copyright (C) GridGain Systems. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

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 */

package org.gridgain.grid.lang;

import org.gridgain.grid.compute.*;

import java.io.*;

/**
 * Defines generic closure with one parameter. Closure is a simple executable which accepts a parameter and
 * returns a value.
 * 
 * In GridGain closures are mainly used for executing distributed computations
 * on the grid, like in {@link GridCompute#apply(GridClosure, Object)} method.
 *
 * @param  Type of closure parameter.
 * @param  Type of the closure return value.
 */
public interface GridClosure extends Serializable {
    /**
     * Closure body.
     *
     * @param e Closure parameter.
     * @return Closure return value.
     */
    public R apply(E e);
}