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/*
 * Copyright (c) 2008-2016, Hazelcast, Inc. 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.
 */

package com.hazelcast.mapreduce;

import com.hazelcast.spi.annotation.Beta;

/**
 * This interface can be implemented to define a Collator which is executed after calculation
 * of the MapReduce algorithm on remote cluster nodes but before returning the final result.
* Collator can, for example, be used to sum up a final value. * * @param value type of the resulting values * @param type for the collated result * @since 3.2 */ @Beta public interface Collator { /** * This method is called with the mapped and possibly reduced values from the MapReduce algorithm. * * @param values The mapped and possibly reduced values from the MapReduce algorithm * @return The collated result */ ValueOut collate(Iterable values); }




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