| /** |
| * 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.examples; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.storm.Config; |
| import org.apache.storm.StormSubmitter; |
| import org.apache.storm.examples.spout.TestWordSpout; |
| import org.apache.storm.generated.GlobalStreamId; |
| import org.apache.storm.grouping.CustomStreamGrouping; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.task.WorkerTopologyContext; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.TopologyBuilder; |
| import org.apache.storm.topology.base.BaseRichBolt; |
| import org.apache.storm.tuple.Tuple; |
| |
| /** |
| * This is a basic example of a Storm topology. |
| */ |
| public final class CustomGroupingTopology { |
| |
| private CustomGroupingTopology() { |
| } |
| |
| public static void main(String[] args) throws Exception { |
| TopologyBuilder builder = new TopologyBuilder(); |
| |
| builder.setSpout("word", new TestWordSpout(), 2); |
| builder.setBolt("mybolt", new MyBolt(), 2) |
| .customGrouping("word", new MyCustomStreamGrouping()); |
| |
| Config conf = new Config(); |
| |
| conf.setNumWorkers(2); |
| |
| StormSubmitter.submitTopology(args[0], conf, builder.createTopology()); |
| } |
| |
| public static class MyBolt extends BaseRichBolt { |
| private static final long serialVersionUID = 1913733461146490337L; |
| private long nItems; |
| |
| @Override |
| @SuppressWarnings("rawtypes") |
| public void prepare( |
| Map conf, |
| TopologyContext context, |
| OutputCollector acollector) { |
| nItems = 0; |
| } |
| |
| @Override |
| public void execute(Tuple tuple) { |
| if (++nItems % 10000 == 0) { |
| System.out.println(tuple.getString(0)); |
| } |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| } |
| } |
| |
| public static class MyCustomStreamGrouping implements CustomStreamGrouping { |
| private static final long serialVersionUID = 5987557161936201860L; |
| private List<Integer> taskIds; |
| |
| public MyCustomStreamGrouping() { |
| } |
| |
| @Override |
| public void prepare( |
| WorkerTopologyContext context, |
| GlobalStreamId stream, |
| List<Integer> targetTasks) { |
| this.taskIds = targetTasks; |
| } |
| |
| @Override |
| public List<Integer> chooseTasks(int taskId, List<Object> values) { |
| List<Integer> ret = new ArrayList<>(); |
| ret.add(taskIds.get(0)); |
| return ret; |
| } |
| } |
| } |