org.rtsa.storm.TwitterSpout.java Source code

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Here is the source code for org.rtsa.storm.TwitterSpout.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.rtsa.storm;

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 TwitterSpout extends BaseRichSpout {

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

    public TwitterSpout(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;
    }

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

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

        StatusListener listener = new StatusListener() {

            public void onStatus(Status status) {

                if (status.getText().length() != 0 && status.getLang().equals("en")) {
                    queue.offer(status);

                }
            }

            public void onDeletionNotice(StatusDeletionNotice sdn) {
            }

            public void onTrackLimitationNotice(int i) {
            }

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

            public void onException(Exception ex) {
            }

            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);

        if (keyWords.length == 0) {

            twitterStream.sample();
        }

        else {

            FilterQuery query = new FilterQuery().track(keyWords);
            twitterStream.filter(query);
        }

    }

    public void nextTuple() {
        Status 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) {

    }

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

}