Apache Storm on Twitter

简述

在本章中，我们将讨论 Apache Storm 的实时应用程序。我们将看到 Storm 在 Twitter 中是如何使用的。

推特

Twitter 是一种在线社交网络服务，它提供了一个发送和接收用户推文的平台。注册用户可以阅读和发布推文，但未注册用户只能阅读推文。Hashtag 用于通过在相关关键字前附加 # 来按关键字对推文进行分类。现在让我们采取一个实时场景来查找每个主题最常用的主题标签。

喷口创建

spout 的目的是尽快获取人们提交的推文。Twitter 提供“Twitter Streaming API”，这是一个基于 Web 服务的工具，用于实时检索人们提交的推文。Twitter Streaming API 可以用任何编程语言访问。

twitter4j是一个开源的、非官方的 Java 库，它提供了一个基于 Java 的模块来轻松访问 Twitter 流 API。twitter4j提供基于侦听器的框架来访问推文。要访问 Twitter 流 API，我们需要登录 Twitter 开发者帐户，并且应该获得以下 OAuth 身份验证详细信息。

客户密钥
客户秘密
访问令牌
AccessTookenSecret

Storm 提供了一个 twitter spout，TwitterSampleSpout,在其入门套件中。我们将使用它来检索推文。spout 需要 OAuth 身份验证详细信息和至少一个关键字。spout 将根据关键字发出实时推文。完整的程序代码如下。

编码：TwitterSampleSpout.java


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<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,
      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
            }
         };
                
         ConfigurationBuilder cb = new ConfigurationBuilder();
                
         cb.setDebugEnabled(true)
            .setOAuthConsumerKey(consumerKey)
            .setOAuthConsumerSecret(consumerSecret)
            .setOAuthAccessToken(accessToken)
            .setOAuthAccessTokenSecret(accessTokenSecret);
                    
         _twitterStream = new TwitterStreamFactory(cb.build()).getInstance();
         _twitterStream.addListener(listener);
                
         if (keyWords.length == 0) {
            _twitterStream.sample();
         }else {
            FilterQuery query = new FilterQuery().track(keyWords);
            _twitterStream.filter(query);
         }
   }
            
   @Override
   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) {}
            
   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("tweet"));
   }
}

标签阅读器bolt

spout 发出的推文将被转发到HashtagReaderBolt，它将处理推文并发出所有可用的主题标签。HashtagReaderBolt 使用getHashTagEntitiestwitter4j 提供的方法。getHashTagEntities 读取推文并返回主题标签列表。完整的程序代码如下 -

编码：HashtagReaderBolt.java


import java.util.HashMap;
import java.util.Map;
import twitter4j.*;
import twitter4j.conf.*;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Tuple;
public class HashtagReaderBolt implements IRichBolt {
   private OutputCollector collector;
   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      this.collector = collector;
   }
   @Override
   public void execute(Tuple tuple) {
      Status tweet = (Status) tuple.getValueByField("tweet");
      for(HashtagEntity hashtage : tweet.getHashtagEntities()) {
         System.out.println("Hashtag: " + hashtage.getText());
         this.collector.emit(new Values(hashtage.getText()));
      }
   }
   @Override
   public void cleanup() {}
   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("hashtag"));
   }
    
   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }
    
}

Hashtag 计数器bolt

发出的主题标签将被转发到HashtagCounterBolt. 此bolt将处理所有主题标签并使用 Java Map 对象将每个主题标签及其计数保存在内存中。完整的程序代码如下。

编码：HashtagCounterBolt.java


import java.util.HashMap;
import java.util.Map;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Tuple;
public class HashtagCounterBolt implements IRichBolt {
   Map<String, Integer> counterMap;
   private OutputCollector collector;
   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      this.counterMap = new HashMap<String, Integer>();
      this.collector = collector;
   }
   @Override
   public void execute(Tuple tuple) {
      String key = tuple.getString(0);
      if(!counterMap.containsKey(key)){
         counterMap.put(key, 1);
      }else{
         Integer c = counterMap.get(key) + 1;
         counterMap.put(key, c);
      }
        
      collector.ack(tuple);
   }
   @Override
   public void cleanup() {
      for(Map.Entry<String, Integer> entry:counterMap.entrySet()){
         System.out.println("Result: " + entry.getKey()+" : " + entry.getValue());
      }
   }
   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("hashtag"));
   }
    
   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }
    
}

提交拓扑

提交拓扑是主要应用程序。Twitter拓扑结构包括TwitterSampleSpout, HashtagReaderBolt，和HashtagCounterBolt. 以下程序代码显示了如何提交拓扑。

编码：TwitterHashtagStorm.java


import java.util.*;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.topology.TopologyBuilder;
public class TwitterHashtagStorm {
   public static void main(String[] args) throws Exception{
      String consumerKey = args[0];
      String consumerSecret = args[1];
        
      String accessToken = args[2];
      String accessTokenSecret = args[3];
        
      String[] arguments = args.clone();
      String[] keyWords = Arrays.copyOfRange(arguments, 4, arguments.length);
        
      Config config = new Config();
      config.setDebug(true);
        
      TopologyBuilder builder = new TopologyBuilder();
      builder.setSpout("twitter-spout", new TwitterSampleSpout(consumerKey,
         consumerSecret, accessToken, accessTokenSecret, keyWords));
      builder.setBolt("twitter-hashtag-reader-bolt", new HashtagReaderBolt())
         .shuffleGrouping("twitter-spout");
      builder.setBolt("twitter-hashtag-counter-bolt", new HashtagCounterBolt())
         .fieldsGrouping("twitter-hashtag-reader-bolt", new Fields("hashtag"));
            
      LocalCluster cluster = new LocalCluster();
      cluster.submitTopology("TwitterHashtagStorm", config,
         builder.createTopology());
      Thread.sleep(10000);
      cluster.shutdown();
   }
}

构建和运行应用程序

完整的应用程序有四个 Java 代码。它们如下 -

TwitterSampleSpout.java
HashtagReaderBolt.java
HashtagCounterBolt.java
TwitterHashtagStorm.java

您可以使用以下命令编译应用程序 -


javac -cp “/path/to/storm/apache-storm-0.9.5/lib/*”:”/path/to/twitter4j/lib/*” *.java

使用以下命令执行应用程序 -


javac -cp “/path/to/storm/apache-storm-0.9.5/lib/*”:”/path/to/twitter4j/lib/*”:.
TwitterHashtagStorm <customerkey> <customersecret> <accesstoken> <accesstokensecret>
<keyword1> <keyword2> … <keywordN>

输出

该应用程序将打印当前可用的主题标签及其计数。输出应类似于以下内容 -


Result: jazztastic : 1
Result: foodie : 1
Result: Redskins : 1
Result: Recipe : 1
Result: cook : 1
Result: android : 1
Result: food : 2
Result: NoToxicHorseMeat : 1
Result: Purrs4Peace : 1
Result: livemusic : 1
Result: VIPremium : 1
Result: Frome : 1
Result: SundayRoast : 1
Result: Millennials : 1
Result: HealthWithKier : 1
Result: LPs30DaysofGratitude : 1
Result: cooking : 1
Result: gameinsight : 1
Result: Countryfile : 1
Result: androidgames : 1