| /** |
| * 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.task.TopologyContext; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.base.BaseBatchBolt; |
| import backtype.storm.coordination.BatchOutputCollector; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| import backtype.storm.utils.Utils; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class KeyedCountingBatchBolt extends BaseBatchBolt { |
| BatchOutputCollector _collector; |
| Object _id; |
| Map<Object, Integer> _counts = new HashMap<Object, Integer>(); |
| |
| @Override |
| public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, Object id) { |
| _collector = collector; |
| _id = id; |
| } |
| |
| @Override |
| public void execute(Tuple tuple) { |
| Object key = tuple.getValue(1); |
| int curr = Utils.get(_counts, key, 0); |
| _counts.put(key, curr + 1); |
| } |
| |
| @Override |
| public void finishBatch() { |
| for(Object key: _counts.keySet()) { |
| _collector.emit(new Values(_id, key, _counts.get(key))); |
| } |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("tx", "key", "count")); |
| } |
| |
| } |