/*
* Copyright (c) 2008-2017, 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.aggregation.impl;
import com.hazelcast.mapreduce.Collator;
import com.hazelcast.mapreduce.CombinerFactory;
import com.hazelcast.mapreduce.Mapper;
import com.hazelcast.mapreduce.ReducerFactory;
import com.hazelcast.mapreduce.aggregation.Supplier;
import java.util.Map;
/**
* The internal interface for Aggregation definitions to make those implementations more type-safe.
* Internal AggTypes are adapted to {@link com.hazelcast.mapreduce.aggregation.Aggregation} using
* an internal class inside {@link com.hazelcast.mapreduce.aggregation.Aggregations} which is not
* part of the public API.
*
* @param <KeyIn> the input key type
* @param <ValueIn> the input value type
* @param <KeyOut> the mappers output key type
* @param <SuppliedValue> the supplied value type
* @param <CombinerValue> the pre-reduced (combined) value type
* @param <ReducerValue> the reduced value type
* @param <Result> the final (mostly collated) value type
*/
public interface AggType<KeyIn, ValueIn, KeyOut, SuppliedValue, CombinerValue, ReducerValue, Result> {
Collator<Map.Entry<KeyOut, ReducerValue>, Result> getCollator();
Mapper<KeyIn, ValueIn, KeyOut, SuppliedValue> getMapper(Supplier<KeyIn, ValueIn, SuppliedValue> supplier);
CombinerFactory<KeyOut, SuppliedValue, CombinerValue> getCombinerFactory();
ReducerFactory<KeyOut, CombinerValue, ReducerValue> getReducerFactory();
}