org.sf.xrime.algorithms.statistics.ViewLabeledSetWithLabelDegree.java Source code

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Here is the source code for org.sf.xrime.algorithms.statistics.ViewLabeledSetWithLabelDegree.java

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/*
 * Copyright (C) IBM Corp. 2009.
 * 
 * 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 org.sf.xrime.algorithms.statistics;

import java.io.IOException;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.util.ToolRunner;
import org.sf.xrime.ProcessorExecutionException;
import org.sf.xrime.Transformer;
import org.sf.xrime.model.vertex.AdjSetVertexWithTwoHopLabel;
import org.sf.xrime.model.vertex.LabeledAdjSetVertexWithTwoHopLabel;

/**
 * View AdjSetVertex Degree
 * 
 * @author juwei
 */
public class ViewLabeledSetWithLabelDegree extends Transformer {
    /**
     * Default constructor.
     */
    public ViewLabeledSetWithLabelDegree() {
        super();
    }

    /**
     * Another constructor.
     * 
     * @param src
     * @param dest
     */
    public ViewLabeledSetWithLabelDegree(Path src, Path dest) {
        super(src, dest);
    }

    /**
     * View Node Degree
     * 
     * @author juwei
     */
    public static class MapClass extends MapReduceBase
            implements Mapper<Text, LabeledAdjSetVertexWithTwoHopLabel, Text, Text> {
        @Override
        public void map(Text key, LabeledAdjSetVertexWithTwoHopLabel value, OutputCollector<Text, Text> output,
                Reporter reporter) throws IOException {
            output.collect(new Text(value.getNeighbors().size() + ""), key);
        }
    }

    @Override
    public void execute() throws ProcessorExecutionException {
        JobConf jobConf = new JobConf(conf, ViewLabeledSetWithLabelDegree.class);
        jobConf.setJobName("ViewLabeledSetWithLabelDegree");

        // the keys are vertex identifiers (strings)
        jobConf.setOutputKeyClass(Text.class);
        // the values are adjacent vertexes with labels (Writable)
        jobConf.setOutputValueClass(Text.class);
        jobConf.setMapperClass(MapClass.class);
        // no combiner is needed.
        // jobConf.setReducerClass(ReduceClass.class);
        // makes the file format suitable for machine processing.
        jobConf.setInputFormat(SequenceFileInputFormat.class);
        jobConf.setOutputFormat(SequenceFileOutputFormat.class);
        // Enable compression.
        jobConf.setCompressMapOutput(true);
        jobConf.setMapOutputCompressorClass(GzipCodec.class);
        FileInputFormat.setInputPaths(jobConf, srcPath);
        FileOutputFormat.setOutputPath(jobConf, destPath);
        jobConf.setNumMapTasks(mapperNum);
        jobConf.setNumReduceTasks(1);

        try {
            this.runningJob = JobClient.runJob(jobConf);
        } catch (IOException e) {
            throw new ProcessorExecutionException(e);
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        try {
            int res = ToolRunner.run(new ViewLabeledSetWithLabelDegree(), args);
            System.exit(res);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}