WindowSprout.java

/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * 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.storm.sample.p3;

import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;

import java.io.*;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;
import java.util.Map;

public class WindowSprout extends BaseRichSpout {

    private BufferedReader reader;
    SpoutOutputCollector _collector;

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("symbol", "price", "volume", "timestamp"));

    }

    @Override
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        this._collector = collector;
        URL url = WindowSprout.class.getResource("/stockquotes.txt");
        try {
            String filePath = new File(url.toURI()).getAbsolutePath();
            reader = new BufferedReader(new FileReader(filePath));
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void nextTuple() {
        try {
            String line = reader.readLine();
            if (line != null) {
            	String [] values = line.split(","); 
                _collector.emit(new Values((Object[])values));
                System.out.println("Input>"+Arrays.toString(values));
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}