| /* |
| * 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; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.generated.StormTopology; |
| import org.apache.storm.spout.SpoutOutputCollector; |
| import org.apache.storm.st.topology.TestableTopology; |
| import org.apache.storm.st.utils.TimeUtil; |
| 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.BaseRichBolt; |
| import org.apache.storm.topology.base.BaseRichSpout; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.tuple.Values; |
| |
| /** |
| * This is a basic example of a Storm topology. |
| */ |
| public class ExclamationTopology { |
| |
| public static final String WORD = "word"; |
| public static final String EXCLAIM_1 = "exclaim1"; |
| public static final String EXCLAIM_2 = "exclaim2"; |
| public static final int SPOUT_EXECUTORS = 10; |
| public static final int EXCLAIM_2_EXECUTORS = 2; |
| |
| public static class ExclamationBolt extends BaseRichBolt { |
| |
| OutputCollector collector; |
| |
| @Override |
| public void prepare(Map<String, Object> conf, TopologyContext context, OutputCollector collector) { |
| this.collector = collector; |
| } |
| |
| @Override |
| public void execute(Tuple tuple) { |
| collector.emit(tuple, new Values(tuple.getString(0) + "!!!")); |
| collector.ack(tuple); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word")); |
| } |
| } |
| |
| public static class FixedOrderWordSpout extends BaseRichSpout { |
| |
| public static final List<String> WORDS = Collections.unmodifiableList(Arrays.asList("nathan", |
| "mike", |
| "jackson", |
| "golda", |
| "bertels")); |
| |
| private SpoutOutputCollector collector; |
| private int currentIndex = 0; |
| private int numEmitted = 0; |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word")); |
| } |
| |
| @Override |
| public void open(Map<String, Object> conf, TopologyContext context, SpoutOutputCollector collector) { |
| this.collector = collector; |
| } |
| |
| @Override |
| public void nextTuple() { |
| if (numEmitted >= TestableTopology.MAX_SPOUT_EMITS) { |
| //Stop emitting at a certain point, because log rolling breaks the tests. |
| return; |
| } |
| //Sleep a bit to avoid hogging the CPU. |
| TimeUtil.sleepMilliSec(1); |
| collector.emit(new Values(WORDS.get((currentIndex++) % WORDS.size()))); |
| ++numEmitted; |
| } |
| |
| } |
| |
| public static void main(String[] args) throws Exception { |
| Config conf = new Config(); |
| conf.setDebug(true); |
| String topoName = "test"; |
| if (args.length > 0) { |
| topoName = args[0]; |
| } |
| |
| conf.setNumWorkers(3); |
| StormTopology topology = getStormTopology(); |
| StormSubmitter.submitTopologyWithProgressBar(topoName, conf, topology); |
| } |
| |
| public static StormTopology getStormTopology() { |
| TopologyBuilder builder = new TopologyBuilder(); |
| builder.setSpout(WORD, new FixedOrderWordSpout(), SPOUT_EXECUTORS); |
| builder.setBolt(EXCLAIM_1, new ExclamationTopology.ExclamationBolt(), 3).shuffleGrouping(WORD); |
| builder.setBolt(EXCLAIM_2, new ExclamationTopology.ExclamationBolt(), EXCLAIM_2_EXECUTORS).shuffleGrouping(EXCLAIM_1); |
| return builder.createTopology(); |
| } |
| } |