nl.utwente.bigdata.bolts.FileOutputBolt.java Source code

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Here is the source code for nl.utwente.bigdata.bolts.FileOutputBolt.java

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/**
 * 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 nl.utwente.bigdata.bolts;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import org.apache.log4j.Logger;

import twitter4j.Status;
import backtype.storm.Config;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Tuple;

public class FileOutputBolt extends BaseBasicBolt {
    private static final long serialVersionUID = 394263766896592119L;
    private File f;
    final String[] fields = new String[] { "tweet", "normalized_text", "sentiment", "home", "away" };
    private BufferedWriter fstream;
    private PrintWriter pw;
    private BufferedWriter writer;
    public static final Logger logger = Logger.getLogger(FileOutputBolt.class);
    private String language;

    public FileOutputBolt(Config conf) {
        this.language = (String) conf.get("language");
    }

    public FileOutputBolt(String string) {
        this.language = string;
    }

    @Override
    public void prepare(java.util.Map stormConf, backtype.storm.task.TopologyContext context) {
        try {
            this.writer = new BufferedWriter(new FileWriter("/tmp/bigdata_" + this.language + ".csv"));
            this.pw = new PrintWriter(this.writer);
            //   logger.info("Wrote to " + this.f.getAbsolutePath());
        } catch (IOException e) {
            e.printStackTrace();
        }
    };

    @Override
    public void execute(Tuple tuple, BasicOutputCollector collector) {
        Status tweet = (Status) tuple.getValueByField("tweet");

        this.pw.println(String.format("%s;%s;%s;%s;%s;%s", tweet.getLang(), tweet.getCreatedAt().toGMTString(),
                tuple.getStringByField("normalized_text"), tuple.getIntegerByField("sentiment"),
                tuple.getStringByField("home"), tuple.getStringByField("away")));
        //   logger.info("Wrote to " + this.f.getAbsolutePath());
        try {
            this.writer.flush();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {

    }
}