| /** |
| * 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.starter; |
| |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.Config; |
| import org.apache.storm.StormSubmitter; |
| import org.apache.storm.starter.bolt.PrinterBolt; |
| import org.apache.storm.starter.bolt.SlidingWindowSumBolt; |
| import org.apache.storm.starter.spout.RandomIntegerSpout; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.TopologyBuilder; |
| import org.apache.storm.topology.base.BaseWindowedBolt; |
| import org.apache.storm.topology.base.BaseWindowedBolt.Count; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.tuple.Values; |
| import org.apache.storm.windowing.TupleWindow; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A sample topology that demonstrates the usage of {@link org.apache.storm.topology.IWindowedBolt} |
| * to calculate sliding window sum. |
| */ |
| public class SlidingWindowTopology { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(SlidingWindowTopology.class); |
| |
| public static void main(String[] args) throws Exception { |
| TopologyBuilder builder = new TopologyBuilder(); |
| builder.setSpout("integer", new RandomIntegerSpout(), 1); |
| builder.setBolt("slidingsum", new SlidingWindowSumBolt().withWindow(Count.of(30), Count.of(10)), 1) |
| .shuffleGrouping("integer"); |
| builder.setBolt("tumblingavg", new TumblingWindowAvgBolt().withTumblingWindow(Count.of(3)), 1) |
| .shuffleGrouping("slidingsum"); |
| builder.setBolt("printer", new PrinterBolt(), 1).shuffleGrouping("tumblingavg"); |
| Config conf = new Config(); |
| conf.setDebug(true); |
| String topoName = "test"; |
| if (args != null && args.length > 0) { |
| topoName = args[0]; |
| } |
| conf.setNumWorkers(1); |
| StormSubmitter.submitTopologyWithProgressBar(topoName, conf, builder.createTopology()); |
| } |
| |
| /* |
| * Computes tumbling window average |
| */ |
| private static class TumblingWindowAvgBolt extends BaseWindowedBolt { |
| private OutputCollector collector; |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) { |
| this.collector = collector; |
| } |
| |
| @Override |
| public void execute(TupleWindow inputWindow) { |
| int sum = 0; |
| List<Tuple> tuplesInWindow = inputWindow.get(); |
| LOG.debug("Events in current window: " + tuplesInWindow.size()); |
| if (tuplesInWindow.size() > 0) { |
| /* |
| * Since this is a tumbling window calculation, |
| * we use all the tuples in the window to compute the avg. |
| */ |
| for (Tuple tuple : tuplesInWindow) { |
| sum += (int) tuple.getValue(0); |
| } |
| collector.emit(new Values(sum / tuplesInWindow.size())); |
| } |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("avg")); |
| } |
| } |
| } |