| /** |
| * 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.apache.storm.mongodb.topology; |
| |
| import com.google.common.collect.Maps; |
| |
| import java.util.Map; |
| |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.BasicOutputCollector; |
| import org.apache.storm.topology.IBasicBolt; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.tuple.Values; |
| |
| public class WordCounter implements IBasicBolt { |
| private Map<String, Integer> wordCounter = Maps.newHashMap(); |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context) { |
| |
| } |
| |
| @Override |
| public void execute(Tuple input, BasicOutputCollector collector) { |
| String word = input.getStringByField("word"); |
| int count; |
| if (wordCounter.containsKey(word)) { |
| count = wordCounter.get(word) + 1; |
| wordCounter.put(word, wordCounter.get(word) + 1); |
| } else { |
| count = 1; |
| } |
| |
| wordCounter.put(word, count); |
| collector.emit(new Values(word, String.valueOf(count))); |
| } |
| |
| @Override |
| public void cleanup() { |
| |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word", "count")); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return null; |
| } |
| |
| } |