| /** |
| * 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 backtype.storm.testing; |
| |
| import backtype.storm.topology.base.BaseBasicBolt; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Fields; |
| import java.util.Map; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.BasicOutputCollector; |
| import java.util.HashMap; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import static backtype.storm.utils.Utils.tuple; |
| |
| |
| public class TestWordCounter extends BaseBasicBolt { |
| public static Logger LOG = LoggerFactory.getLogger(TestWordCounter.class); |
| |
| Map<String, Integer> _counts; |
| |
| public void prepare(Map stormConf, TopologyContext context) { |
| _counts = new HashMap<String, Integer>(); |
| } |
| |
| public void execute(Tuple input, BasicOutputCollector collector) { |
| String word = (String) input.getValues().get(0); |
| int count = 0; |
| if(_counts.containsKey(word)) { |
| count = _counts.get(word); |
| } |
| count++; |
| _counts.put(word, count); |
| collector.emit(tuple(word, count)); |
| } |
| |
| public void cleanup() { |
| |
| } |
| |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word", "count")); |
| } |
| |
| } |