storm.starter.trident.homework.spouts.TwitterSampleSpout.java Source code

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Here is the source code for storm.starter.trident.homework.spouts.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 storm.starter.trident.homework.spouts;

import backtype.storm.Config;
import backtype.storm.task.TopologyContext;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;
import storm.trident.operation.TridentCollector;
import storm.trident.spout.IBatchSpout;
import twitter4j.*;
import twitter4j.auth.AccessToken;
import twitter4j.conf.ConfigurationBuilder;

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

@SuppressWarnings("serial")
public class TwitterSampleSpout implements IBatchSpout {

    // Trident batch size
    private static final int RECORDS_PER_BATCH = 10;

    LinkedBlockingQueue<Status> 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;
    }

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

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

        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);

        if (keyWords.length == 0) {

            twitterStream.sample();
        } else {

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

    }

    @Override
    public void emitBatch(long batchId, TridentCollector collector) {
        int emitted = 0;
        while (emitted < RECORDS_PER_BATCH) {

            Status ret = queue.poll();
            if (ret == null) {
                Utils.sleep(50);
            } else {
                collector.emit(new Values(ret));
                emitted++;
            }
        }
    }

    @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(long id) {
        //System.out.println("Twitter spout ack = "+id.toString());
    }

    //@Override
    public void fail(Object id) {
        //System.out.println("Twitter spout fail = "+id.toString());
    }

    @Override
    public Fields getOutputFields() {
        return (new Fields("tweet"));
    }

}