Java tutorial
/* * 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.examples; import org.apache.commons.lang3.StringEscapeUtils; import org.apache.commons.lang3.text.WordUtils; import org.apache.commons.math3.random.JDKRandomGenerator; import org.apache.flink.api.common.JobExecutionResult; import org.apache.flink.api.java.DataSet; import org.apache.flink.api.java.ExecutionEnvironment; import org.apache.flink.api.java.io.CsvOutputFormat; import org.apache.flink.api.java.utils.DataSetUtils; import org.apache.flink.api.java.utils.ParameterTool; import org.apache.flink.graph.Graph; import org.apache.flink.graph.GraphAnalytic; import org.apache.flink.graph.GraphCsvReader; import org.apache.flink.graph.asm.translate.LongValueToIntValue; import org.apache.flink.graph.asm.translate.TranslateGraphIds; import org.apache.flink.graph.generator.RMatGraph; import org.apache.flink.graph.generator.random.JDKRandomGeneratorFactory; import org.apache.flink.graph.generator.random.RandomGenerableFactory; import org.apache.flink.types.IntValue; import org.apache.flink.types.LongValue; import org.apache.flink.types.NullValue; import org.apache.flink.types.StringValue; import java.text.NumberFormat; /** * Driver for the library implementations of Global and Local Clustering Coefficient. * * This example reads a simple directed or undirected graph from a CSV file or * generates an RMat graph with the given scale and edge factor then calculates * the local clustering coefficient for each vertex and the global clustering * coefficient for the graph. * * @see org.apache.flink.graph.library.clustering.directed.GlobalClusteringCoefficient * @see org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient * @see org.apache.flink.graph.library.clustering.undirected.GlobalClusteringCoefficient * @see org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient */ public class ClusteringCoefficient { public static final int DEFAULT_SCALE = 10; public static final int DEFAULT_EDGE_FACTOR = 16; public static final boolean DEFAULT_CLIP_AND_FLIP = true; private static void printUsage() { System.out.println(WordUtils.wrap("The local clustering coefficient measures the connectedness of each" + " vertex's neighborhood and the global clustering coefficient measures the connectedness of the graph." + " Scores range from 0.0 (no edges between neighbors or vertices) to 1.0 (neighborhood or graph" + " is a clique).", 80)); System.out.println(); System.out.println(WordUtils.wrap("This algorithm returns tuples containing the vertex ID, the degree of" + " the vertex, and the number of edges between vertex neighbors.", 80)); System.out.println(); System.out.println( "usage: ClusteringCoefficient --directed <true | false> --input <csv | rmat [options]> --output <print | hash | csv [options]>"); System.out.println(); System.out.println("options:"); System.out.println( " --input csv --type <integer | string> --input_filename FILENAME [--input_line_delimiter LINE_DELIMITER] [--input_field_delimiter FIELD_DELIMITER]"); System.out.println(" --input rmat [--scale SCALE] [--edge_factor EDGE_FACTOR]"); System.out.println(); System.out.println(" --output print"); System.out.println(" --output hash"); System.out.println( " --output csv --output_filename FILENAME [--output_line_delimiter LINE_DELIMITER] [--output_field_delimiter FIELD_DELIMITER]"); } public static void main(String[] args) throws Exception { // Set up the execution environment final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); env.getConfig().enableObjectReuse(); ParameterTool parameters = ParameterTool.fromArgs(args); if (!parameters.has("directed")) { printUsage(); return; } boolean directedAlgorithm = parameters.getBoolean("directed"); // global and local clustering coefficient results GraphAnalytic gcc; DataSet lcc; switch (parameters.get("input", "")) { case "csv": { String lineDelimiter = StringEscapeUtils .unescapeJava(parameters.get("input_line_delimiter", CsvOutputFormat.DEFAULT_LINE_DELIMITER)); String fieldDelimiter = StringEscapeUtils .unescapeJava(parameters.get("input_field_delimiter", CsvOutputFormat.DEFAULT_FIELD_DELIMITER)); GraphCsvReader reader = Graph.fromCsvReader(parameters.get("input_filename"), env) .ignoreCommentsEdges("#").lineDelimiterEdges(lineDelimiter).fieldDelimiterEdges(fieldDelimiter); switch (parameters.get("type", "")) { case "integer": { Graph<LongValue, NullValue, NullValue> graph = reader.keyType(LongValue.class); if (directedAlgorithm) { gcc = graph.run( new org.apache.flink.graph.library.clustering.directed.GlobalClusteringCoefficient<LongValue, NullValue, NullValue>()); lcc = graph.run( new org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient<LongValue, NullValue, NullValue>()); } else { gcc = graph.run( new org.apache.flink.graph.library.clustering.undirected.GlobalClusteringCoefficient<LongValue, NullValue, NullValue>()); lcc = graph.run( new org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient<LongValue, NullValue, NullValue>()); } } break; case "string": { Graph<StringValue, NullValue, NullValue> graph = reader.keyType(StringValue.class); if (directedAlgorithm) { gcc = graph.run( new org.apache.flink.graph.library.clustering.directed.GlobalClusteringCoefficient<StringValue, NullValue, NullValue>()); lcc = graph.run( new org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient<StringValue, NullValue, NullValue>()); } else { gcc = graph.run( new org.apache.flink.graph.library.clustering.undirected.GlobalClusteringCoefficient<StringValue, NullValue, NullValue>()); lcc = graph.run( new org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient<StringValue, NullValue, NullValue>()); } } break; default: printUsage(); return; } } break; case "rmat": { int scale = parameters.getInt("scale", DEFAULT_SCALE); int edgeFactor = parameters.getInt("edge_factor", DEFAULT_EDGE_FACTOR); RandomGenerableFactory<JDKRandomGenerator> rnd = new JDKRandomGeneratorFactory(); long vertexCount = 1L << scale; long edgeCount = vertexCount * edgeFactor; Graph<LongValue, NullValue, NullValue> graph = new RMatGraph<>(env, rnd, vertexCount, edgeCount) .generate(); if (directedAlgorithm) { if (scale > 32) { Graph<LongValue, NullValue, NullValue> newGraph = graph.run( new org.apache.flink.graph.asm.simple.directed.Simplify<LongValue, NullValue, NullValue>()); gcc = newGraph.run( new org.apache.flink.graph.library.clustering.directed.GlobalClusteringCoefficient<LongValue, NullValue, NullValue>()); lcc = newGraph.run( new org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient<LongValue, NullValue, NullValue>() .setIncludeZeroDegreeVertices(false)); } else { Graph<IntValue, NullValue, NullValue> newGraph = graph .run(new TranslateGraphIds<LongValue, IntValue, NullValue, NullValue>( new LongValueToIntValue())) .run(new org.apache.flink.graph.asm.simple.directed.Simplify<IntValue, NullValue, NullValue>()); gcc = newGraph.run( new org.apache.flink.graph.library.clustering.directed.GlobalClusteringCoefficient<IntValue, NullValue, NullValue>()); lcc = newGraph.run( new org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient<IntValue, NullValue, NullValue>() .setIncludeZeroDegreeVertices(false)); } } else { boolean clipAndFlip = parameters.getBoolean("clip_and_flip", DEFAULT_CLIP_AND_FLIP); if (scale > 32) { Graph<LongValue, NullValue, NullValue> newGraph = graph.run( new org.apache.flink.graph.asm.simple.undirected.Simplify<LongValue, NullValue, NullValue>( clipAndFlip)); gcc = newGraph.run( new org.apache.flink.graph.library.clustering.undirected.GlobalClusteringCoefficient<LongValue, NullValue, NullValue>()); lcc = newGraph.run( new org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient<LongValue, NullValue, NullValue>() .setIncludeZeroDegreeVertices(false)); } else { Graph<IntValue, NullValue, NullValue> newGraph = graph .run(new TranslateGraphIds<LongValue, IntValue, NullValue, NullValue>( new LongValueToIntValue())) .run(new org.apache.flink.graph.asm.simple.undirected.Simplify<IntValue, NullValue, NullValue>( clipAndFlip)); gcc = newGraph.run( new org.apache.flink.graph.library.clustering.undirected.GlobalClusteringCoefficient<IntValue, NullValue, NullValue>()); lcc = newGraph.run( new org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient<IntValue, NullValue, NullValue>() .setIncludeZeroDegreeVertices(false)); } } } break; default: printUsage(); return; } switch (parameters.get("output", "")) { case "print": if (directedAlgorithm) { for (Object e : lcc.collect()) { org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient.Result result = (org.apache.flink.graph.library.clustering.directed.LocalClusteringCoefficient.Result) e; System.out.println(result.toVerboseString()); } } else { for (Object e : lcc.collect()) { org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient.Result result = (org.apache.flink.graph.library.clustering.undirected.LocalClusteringCoefficient.Result) e; System.out.println(result.toVerboseString()); } } System.out.println(gcc.getResult()); break; case "hash": System.out.println(DataSetUtils.checksumHashCode(lcc)); System.out.println(gcc.getResult()); break; case "csv": String filename = parameters.get("output_filename"); String lineDelimiter = StringEscapeUtils .unescapeJava(parameters.get("output_line_delimiter", CsvOutputFormat.DEFAULT_LINE_DELIMITER)); String fieldDelimiter = StringEscapeUtils.unescapeJava( parameters.get("output_field_delimiter", CsvOutputFormat.DEFAULT_FIELD_DELIMITER)); lcc.writeAsCsv(filename, lineDelimiter, fieldDelimiter); System.out.println(gcc.execute()); break; default: printUsage(); return; } JobExecutionResult result = env.getLastJobExecutionResult(); NumberFormat nf = NumberFormat.getInstance(); System.out.println("Execution runtime: " + nf.format(result.getNetRuntime()) + " ms"); } }