| /** |
| * 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.heron.examples.eco; |
| |
| |
| import java.util.Map; |
| |
| import org.apache.heron.api.bolt.BasicOutputCollector; |
| import org.apache.heron.api.bolt.IBasicBolt; |
| import org.apache.heron.api.topology.OutputFieldsDeclarer; |
| import org.apache.heron.api.topology.TopologyContext; |
| import org.apache.heron.api.tuple.Fields; |
| import org.apache.heron.api.tuple.Tuple; |
| |
| import static org.apache.heron.api.utils.Utils.tuple; |
| |
| @SuppressWarnings({"serial", "rawtypes", "unchecked"}) |
| public class EvenAndOddBolt implements IBasicBolt { |
| |
| |
| @Override |
| public void prepare(Map stormConf, TopologyContext context) { |
| |
| } |
| |
| protected int getTupleValue(Tuple t, int idx) { |
| return (int) t.getValues().get(idx); |
| } |
| |
| @Override |
| public void execute(Tuple input, BasicOutputCollector collector) { |
| int number = getTupleValue(input, 0); |
| |
| if (number % 2 == 0) { |
| System.out.println("Emitting to evens stream: " + number); |
| collector.emit("evens", tuple(input.getValues().get(0))); |
| |
| } else { |
| System.out.println("emitting to odds stream: " + number); |
| collector.emit("odds", tuple(input.getValues().get(0))); |
| } |
| |
| collector.emit(tuple(input.getValues().get(0))); |
| |
| |
| |
| } |
| |
| @Override |
| public void cleanup() { |
| |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declareStream("evens", new Fields("evens")); |
| declarer.declareStream("odds", new Fields("odds")); |
| declarer.declare(new Fields("number")); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return null; |
| } |
| } |