storm.starter.spout.TwitterKeywordsSpout.java Source code

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Here is the source code for storm.starter.spout.TwitterKeywordsSpout.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 storm.starter.spout;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import twitter4j.FilterQuery;
import twitter4j.StallWarning;
import twitter4j.Status;
import twitter4j.StatusDeletionNotice;
import twitter4j.StatusListener;
import twitter4j.TwitterStream;
import twitter4j.TwitterStreamFactory;
import twitter4j.auth.AccessToken;
import twitter4j.conf.ConfigurationBuilder;

import backtype.storm.Config;
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 backtype.storm.utils.Utils;

@SuppressWarnings("serial")
public class TwitterKeywordsSpout extends BaseRichSpout {

    int TweetsCollected;
    LinkedBlockingQueue<Status> queue = null;
    SpoutOutputCollector _collector;
    String consumerKey;
    String consumerSecret;
    String accessToken;
    String accessTokenSecret;
    String[] keyWords;
    TwitterStream _twitterStream;

    protected static Logger log = LoggerFactory.getLogger("TwitterKeywordsSpout");

    public TwitterKeywordsSpout(String consumerKey, String consumerSecret, String accessToken,
            String accessTokenSecret, String[] keyWords) {
        this.consumerKey = consumerKey;
        this.consumerSecret = consumerSecret;
        this.accessToken = accessToken;
        this.accessTokenSecret = accessTokenSecret;
        this.keyWords = keyWords;
        this.TweetsCollected = 0;

    }

    public TwitterKeywordsSpout() {
        // TODO Auto-generated constructor stub
    }

    @Override
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        queue = new LinkedBlockingQueue<Status>(1000);
        _collector = collector;

        StatusListener listener = new StatusListener() {

            @Override
            public void onStatus(Status status) {
                queue.offer(status);
            }

            @Override
            public void onDeletionNotice(StatusDeletionNotice sdn) {
            }

            @Override
            public void onTrackLimitationNotice(int i) {
            }

            @Override
            public void onScrubGeo(long l, long l1) {
            }

            @Override
            public void onException(Exception ex) {
            }

            @Override
            public void onStallWarning(StallWarning arg0) {
                // TODO Auto-generated method stub

            }

        };

        TwitterStream twitterStream = new TwitterStreamFactory(
                new ConfigurationBuilder().setJSONStoreEnabled(true).build()).getInstance();

        twitterStream.addListener(listener);
        twitterStream.setOAuthConsumer(consumerKey, consumerSecret);
        AccessToken token = new AccessToken(accessToken, accessTokenSecret);
        twitterStream.setOAuthAccessToken(token);
        _twitterStream = twitterStream;

        if (keyWords.length == 0) {

            twitterStream.sample();
        }

        else {
            // TODO: Adjust the query below to also track locations and languages.
            FilterQuery query = new FilterQuery();
            query.track(keyWords);
            query.language(new String[] { "en" });

            twitterStream.filter(query);

        }

    }

    @Override
    public void nextTuple() {
        Status ret = queue.poll();

        // If we have no tweets (which is very unlikely) then wait another 10 seconds
        if (ret == null) {
            Utils.sleep(50);
        }
        // Otherwise send them all to the collector
        else {
            try {
                _collector.emit(new Values(ret));
            } catch (Exception ex) {
                log.error("Error collecting tweets: " + ex.getMessage());
                ex.printStackTrace();
            }
        }
    }

    @Override
    public void close() {
        log.info("Closing Twitter stream...");
        _twitterStream.shutdown();
    }

    @Override
    public Map<String, Object> getComponentConfiguration() {
        Config ret = new Config();
        ret.setMaxTaskParallelism(1);
        return ret;
    }

    @Override
    public void ack(Object id) {
    }

    @Override
    public void fail(Object id) {
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("tweet"));
    }

}