| /* |
| * 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.ranger.authorization.storm; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.base.BaseRichBolt; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.tuple.Values; |
| |
| /** |
| * A Storm Bolt which reads in a word and counts it + outputs the word + current count |
| */ |
| public class WordCounterBolt extends BaseRichBolt { |
| private OutputCollector outputCollector; |
| private Map<String, Integer> countMap = new HashMap<>(); |
| |
| @Override |
| public void execute(Tuple tuple) { |
| String word = tuple.getString(0); |
| |
| int count = 0; |
| if (countMap.containsKey(word)) { |
| count = countMap.get(word); |
| count++; |
| } |
| count++; |
| countMap.put(word, count); |
| |
| outputCollector.emit(new Values(word, count)); |
| outputCollector.ack(tuple); |
| |
| } |
| |
| @Override |
| public void prepare(Map arg0, TopologyContext arg1, OutputCollector outputCollector) { |
| this.outputCollector = outputCollector; |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word", "count")); |
| } |
| |
| |
| } |