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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.util.lang;

import org.gridgain.grid.*;
import org.gridgain.grid.lang.*;
import org.gridgain.grid.util.typedef.*;

/**
 * Convenient reducer subclass that allows for thrown grid exception. This class
 * implements {@link #reduce()} method that calls {@link #applyx()} method and
 * properly wraps {@link GridException} into {@link GridClosureException} instance.
 * @see RX1
 */
public abstract class GridReducerX implements GridReducer {
    /** {@inheritDoc} */
    @Override public R reduce() {
        try {
            return applyx();
        }
        catch (GridException e) {
            throw F.wrap(e);
        }
    }

    /**
     * Reducer body that can throw {@link GridException}.
     *
     * @return Reducer return value.
     * @throws GridException Thrown in case of any error condition inside of the reducer.
     */
    public abstract R applyx() throws GridException;
}