[GitHub] flink pull request #3802: Add Evenly Graph Generator to Flink Gelly

[fanzhidongyzby <gi...@git.apache.org>]

Github user fanzhidongyzby commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3802#discussion_r114094440
  
    --- Diff: flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/generator/CirculantGraph.java ---
    @@ -0,0 +1,141 @@
    +/*
    + * 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.generator;
    +
    +import org.apache.flink.api.common.functions.FlatMapFunction;
    +import org.apache.flink.api.java.DataSet;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.api.java.functions.FunctionAnnotation;
    +import org.apache.flink.graph.Edge;
    +import org.apache.flink.graph.Graph;
    +import org.apache.flink.graph.Vertex;
    +import org.apache.flink.types.LongValue;
    +import org.apache.flink.types.NullValue;
    +import org.apache.flink.util.Collector;
    +import org.apache.flink.util.LongValueSequenceIterator;
    +import org.apache.flink.util.Preconditions;
    +
    +import java.util.HashSet;
    +import java.util.Set;
    +
    +/*
    + * @see <a href="http://mathworld.wolfram.com/CirculantGraph.html">Circulant Graph at Wolfram MathWorld</a>
    + */
    +public class CirculantGraph
    +extends AbstractGraphGenerator<LongValue, NullValue, NullValue> {
    +
    +	public static final int MINIMUM_VERTEX_COUNT = 1;
    +
    +	public static final int MINIMUM_OFFSET = 1;
    +
    +	// Required to create the DataSource
    +	private final ExecutionEnvironment env;
    +
    +	// Required configuration
    +	private long vertexCount;
    +
    +	private Set<Long> signedOffsets = new HashSet<>();
    +
    +	/**
    +	 * An undirected {@link Graph} whose {@link Vertex} connects to targets appointed by an offset list.
    +	 *
    +	 * @param env the Flink execution environment
    +	 * @param vertexCount number of vertices
    +	 */
    +	public CirculantGraph(ExecutionEnvironment env, long vertexCount) {
    +		Preconditions.checkArgument(vertexCount >= MINIMUM_VERTEX_COUNT,
    +			"Vertex count must be at least " + MINIMUM_VERTEX_COUNT);
    +
    +		this.env = env;
    +		this.vertexCount = vertexCount;
    +	}
    +
    +	/**
    +	 * Required configuration for each offset of the graph.
    +	 *
    +	 * @param offset appoint the vertices' position should be linked by any vertex
    +	 * @return this
    +	 */
    +	public CirculantGraph addOffset(long offset) {
    --- End diff --
    
    I got it ! the method has been implemented assumes length is  1, I need add length parameter to enable add multiple offsets once, just with two parameters: offset and length.


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