org.sf.xrime.algorithms.MST.MSTStep.java Source code

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Here is the source code for org.sf.xrime.algorithms.MST.MSTStep.java

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/*
 * Copyright (C) yangyin@BUPT. 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.MST;

import java.io.IOException;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
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.SequenceFileInputFormat;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.sf.xrime.ProcessorExecutionException;
import org.sf.xrime.algorithms.GraphAlgorithm;
import org.sf.xrime.model.vertex.LabeledAdjVertex;
import org.sf.xrime.utils.SequenceTempDirMgr;

/**
 * This class is the step class in the computing part of MST algorithm
 * The execution method of step class in MST algorithm is called in each
 * round of the algorithm  
 * @author YangYin
 *
 */
public class MSTStep extends GraphAlgorithm {

    private String terminateFileName = "Terminate";
    static final public String terminateFileKey = "xrime.algorithm.MST.terminate.flag";
    static final public String autoWakeUpListKey = "xrime.algorithm.MST.autoWakeUpList.flag";
    private boolean end = false;

    private JobConf jobConf;
    private FileSystem client = null;

    private SequenceTempDirMgr tempDirs = null;
    private String autoWakeUpList = "";

    public String getTerminateFileFlag() {
        return terminateFileName;
    }

    public void setTerminateFileFlag(String terminateFileName) {
        this.terminateFileName = terminateFileName;
    }

    private String terminateFlagFile() throws IllegalAccessException {
        Path filePath = new Path(context.getDestination().getPath().toString());
        return filePath.getParent().toString() + "/" + terminateFileName;
    }

    public boolean isEnd() {
        return end;
    }

    public FileSystem getClient() {
        return client;
    }

    public void setClient(FileSystem client) {
        this.client = client;
    }

    public String getAutoWakeUpList() {
        return autoWakeUpList;
    }

    public void setAutoWakeUpList(String autoWakeUpList) {
        this.autoWakeUpList = autoWakeUpList;
    }

    public SequenceTempDirMgr getTempDirs() {
        return tempDirs;
    }

    public void setTempDirs(SequenceTempDirMgr tempDirs) {
        this.tempDirs = tempDirs;
    }

    @Override
    public void execute() throws ProcessorExecutionException {
        try {
            /**
             * Set related properties for MST job
             */
            context.setParameter(terminateFileKey, terminateFlagFile());
            context.setParameter(MSTStep.autoWakeUpListKey, autoWakeUpList);

            jobConf = new JobConf(context, MSTStep.class);
            jobConf.setJobName("MST");

            FileInputFormat.setInputPaths(jobConf, context.getSource().getPath());

            jobConf.setInputFormat(SequenceFileInputFormat.class);
            if (!isEnd())
                jobConf.setMapperClass(MSTMapper.class);
            else
                jobConf.setMapperClass(MSTFinalMapper.class);

            jobConf.setNumMapTasks(getMapperNum());
            jobConf.setMapOutputValueClass(LabeledAdjVertex.class);

            if (!isEnd())
                jobConf.setReducerClass(MSTReducer.class);
            else
                jobConf.setReducerClass(MSTFinalReducer.class);

            jobConf.setNumReduceTasks(getReducerNum());

            jobConf.setOutputKeyClass(Text.class);
            jobConf.setOutputValueClass(LabeledAdjVertex.class);

            FileOutputFormat.setOutputPath(jobConf, context.getDestination().getPath());
            jobConf.setOutputFormat(SequenceFileOutputFormat.class);

            this.runningJob = JobClient.runJob(jobConf);

            if (client == null) {
                client = FileSystem.get(jobConf);
            }
            if (client.exists(new Path(terminateFlagFile()))) {
                end = true;
            } else {
                end = false;
            }
        } catch (IOException e) {
            throw new ProcessorExecutionException(e);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}