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

Introduction

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

Source

/**
 * 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.util.Map;

import twitter4j.Status;
import nl.utwente.bigdata.utils.Emoji;
import backtype.storm.Config;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

public class PrinterSentiment extends BaseBasicBolt {
    private static final long serialVersionUID = 394263766896592119L;
    private String id;
    private String topology;
    private String language;

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

    @Override
    public void prepare(Map stormConf, TopologyContext context) {
        this.id = context.getThisComponentId();
        this.topology = context.getStormId();
    }

    @Override
    public void execute(Tuple tuple, BasicOutputCollector collector) {
        String icon;

        if ((Integer) tuple.getValueByField("sentiment") > 0) {
            icon = ":-D";
        } else if ((Integer) tuple.getValueByField("sentiment") < 0) {
            icon = ">:[";
        } else {
            icon = ":-)";
        }
        Status tweet = (Status) tuple.getValueByField("tweet");
        String tweetText = tweet.getText();
        System.out.println(Emoji.replaceFlagInText(this.language) + " " + Emoji.replaceInText(icon) + " " + "DATE: "
                + tweet.getCreatedAt().toGMTString() + " " + "MATCH: " + tuple.getValueByField("home") + "-"
                + tuple.getValueByField("away") + " - " + tweetText + " " + tuple.getValueByField("sentiment"));

        collector.emit(new Values(this.language, tuple.getStringByField("normalized_text"),
                tweet.getCreatedAt().toGMTString(), tuple.getStringByField("home"), tuple.getValueByField("away"),
                tuple.getValueByField("sentiment")));
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer ofd) {
        ofd.declare(new Fields("language", "normalized_text", "created_at", "home", "away", "sentiment"));
    }

}