org.umd.assignment.spout.TwitterSampleSpout.java Source code

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Here is the source code for org.umd.assignment.spout.TwitterSampleSpout.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 org.umd.assignment.spout;

import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;

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 TwitterSampleSpout extends BaseRichSpout {

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

    public TwitterSampleSpout(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;
    }

    //----------------------- Task 0 -----------------------------------------
    //
    //  Use the following link (for visual help) to create a Twitter App for yourselves. In summary,
    //  the steps are:
    //        (a) Go to apps.twitter.com
    //        (b) Create an App [Put any website as an URL]
    //        (c) Go to "keys and Access Token tab"
    //        (d) Create you access token
    //        (e) Copy over the ConsumerKey, consumerSecret, accesstoken, and accessTokenSecret
    //        in the TwitterSampleSpout()
    //
    //  https://dev.twitter.com/oauth/overview/application-owner-access-tokens
    //  
    //------------------------------------------------------------------------

    public TwitterSampleSpout() {
        this.consumerKey = "C0PRjUbKOHaF0xp4NVfdMMJUe";
        this.consumerSecret = "EjzUyYmZ7oBguADRqm5r2W1lI2grM4YZiVYcyTbmh2ZvnNE1K9";
        this.accessToken = "2588753791-H8IxYCbhGZJQ6aI9zLGCzNGZh700fGLEfiVpGQt";
        this.accessTokenSecret = "iz8J02XBBQQb1mHYxz08SWG82n4zwuqYNEdXbuEMIsOeB";
        this.keyWords = new String[1];
        this.keyWords[0] = "obama"; /* Filters All Tweets with word Obama */
    }

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

        StatusListener listener = new StatusListener() {

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

            @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) {
            }

        };

        TwitterStreamFactory fact = new TwitterStreamFactory(
                new ConfigurationBuilder().setJSONStoreEnabled(true).build());

        _twitterStream = fact.getInstance();

        _twitterStream.addListener(listener);
        _twitterStream.setOAuthConsumer(consumerKey, consumerSecret);

        AccessToken token = new AccessToken(accessToken, accessTokenSecret);
        _twitterStream.setOAuthAccessToken(token);

        if (keyWords.length == 0) {
            _twitterStream.sample();
        } else {
            FilterQuery query = new FilterQuery().track(keyWords);
            _twitterStream.filter(query);
        }

    }

    @Override
    public void nextTuple() {
        String ret = queue.poll();
        if (ret == null) {
            Utils.sleep(50);
        } else {

            _collector.emit(new Values(ret));

        }
    }

    @Override
    public void close() {
        _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"));
    }

}