001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.hadoop.tools.twitter;
031
032import java.io.IOException;
033
034import org.apache.hadoop.fs.Path;
035import org.apache.hadoop.io.LongWritable;
036import org.apache.hadoop.io.NullWritable;
037import org.apache.hadoop.io.Text;
038import org.apache.hadoop.mapreduce.Job;
039import org.apache.hadoop.mapreduce.Mapper;
040import org.kohsuke.args4j.CmdLineException;
041import org.openimaj.hadoop.mapreduce.StageRunner;
042import org.openimaj.hadoop.mapreduce.stage.Stage;
043import org.openimaj.hadoop.mapreduce.stage.helper.TextStage;
044import org.openimaj.hadoop.tools.HadoopToolsUtil;
045
046
047
048/**
049 * A hadoop implementation of twitter preprocessing
050 *
051 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
052 *
053 */
054public class HadoopTwitterPreprocessingTool extends StageRunner {
055        String[] args;
056        private HadoopTwitterPreprocessingToolOptions options;
057        /**
058         * where arguments are held
059         */
060        public static final String ARGS_KEY = "twitter.preprocessing.args";
061
062
063        @Override
064        public Stage<?, ?, ?, ?, ?, ?, ?, ?> stage() {
065
066                return new TextStage(){
067                        @Override
068                        public Class<? extends Mapper<LongWritable, Text, NullWritable, Text>> mapper() {
069                                return SimpleTwitterPreprocessingMapper.class;
070                        }
071
072                        @Override
073                        public void setup(Job job) {
074                                if(options.reducerMode == ReducerModeOption.NULL){
075                                        job.setNumReduceTasks(0);
076                                }
077                                else if(options.reducerMode == ReducerModeOption.IDENTITY){
078                                        job.setNumReduceTasks(1);
079                                }
080                                job.getConfiguration().setStrings(HadoopTwitterPreprocessingTool.ARGS_KEY, HadoopToolsUtil.encodeArgs(args));
081                        }
082
083                        @Override
084                        public boolean lzoCompress() {
085                                return options.lzoCompress;
086                        }
087                };
088        }
089
090        @Override
091        public Path output() {
092                return options.getOutputPath();
093        }
094
095        @Override
096        public Path[] inputs() throws IOException {
097                return options.getInputPaths();
098        }
099
100        @Override
101        public void args(String[] args) throws CmdLineException, IOException {
102                this.options = new HadoopTwitterPreprocessingToolOptions(args,true);
103                options.prepare();
104                this.args = args;
105        }
106
107        @Override
108        public boolean shouldWait() {
109                return !options.returnImmediately;
110        }
111
112        /**
113         * run the tool
114         * @param args
115         * @throws Exception
116         */
117        public static void main(String[] args) throws Exception {
118                try {
119                        new HadoopTwitterPreprocessingTool().runMain(args);
120                } catch (CmdLineException e) {
121                        System.err.print(e);
122                }
123        }
124}