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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.graph;

import java.io.Serializable;

import org.apache.flink.api.common.functions.Function;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.util.Collector;

/**
 * Interface to be implemented by the function applied to a vertex neighborhood
 * in the {@link Graph#groupReduceOnNeighbors(NeighborsFunction, EdgeDirection)}
 * method.
 *
 * @param  the vertex key type
 * @param  the vertex value type
 * @param  the edge value type
 * @param  the type of the return value
 */
public interface NeighborsFunction extends Function, Serializable {

	void iterateNeighbors(Iterable, Vertex>> neighbors, Collector out) throws Exception;
}