| /* |
| * 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.Map; |
| import org.apache.storm.Config; |
| import org.apache.storm.StormSubmitter; |
| import org.apache.storm.starter.bolt.PrinterBolt; |
| import org.apache.storm.starter.spout.RandomIntegerSpout; |
| import org.apache.storm.state.KeyValueState; |
| import org.apache.storm.state.State; |
| 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.BaseStatefulWindowedBolt; |
| 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 simple example that demonstrates the usage of {@link org.apache.storm.topology.IStatefulWindowedBolt} to save the state of the |
| * windowing operation to avoid re-computation in case of failures. |
| * <p> |
| * The framework internally manages the window boundaries and does not invoke |
| * {@link org.apache.storm.topology.IWindowedBolt#execute(TupleWindow)} |
| * for the already evaluated windows in case of restarts during failures. The |
| * {@link org.apache.storm.topology.IStatefulBolt#initState(State)} |
| * is invoked with the previously saved state of the bolt after prepare, before the execute() method is invoked. |
| * </p> |
| */ |
| public class StatefulWindowingTopology { |
| private static final Logger LOG = LoggerFactory.getLogger(StatefulWindowingTopology.class); |
| |
| public static void main(String[] args) throws Exception { |
| TopologyBuilder builder = new TopologyBuilder(); |
| builder.setSpout("spout", new RandomIntegerSpout()); |
| builder.setBolt("sumbolt", new WindowSumBolt().withWindow(new Count(5), new Count(3)) |
| .withMessageIdField("msgid"), 1).shuffleGrouping("spout"); |
| builder.setBolt("printer", new PrinterBolt(), 1).shuffleGrouping("sumbolt"); |
| Config conf = new Config(); |
| conf.setDebug(false); |
| //conf.put(Config.TOPOLOGY_STATE_PROVIDER, "org.apache.storm.redis.state.RedisKeyValueStateProvider"); |
| |
| String topoName = "test"; |
| if (args != null && args.length > 0) { |
| topoName = args[0]; |
| } |
| conf.setNumWorkers(1); |
| StormSubmitter.submitTopologyWithProgressBar(topoName, conf, builder.createTopology()); |
| } |
| |
| private static class WindowSumBolt extends BaseStatefulWindowedBolt<KeyValueState<String, Long>> { |
| private KeyValueState<String, Long> state; |
| private long sum; |
| |
| private OutputCollector collector; |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) { |
| this.collector = collector; |
| } |
| |
| @Override |
| public void initState(KeyValueState<String, Long> state) { |
| this.state = state; |
| sum = state.get("sum", 0L); |
| LOG.debug("initState with state [" + state + "] current sum [" + sum + "]"); |
| } |
| |
| @Override |
| public void execute(TupleWindow inputWindow) { |
| for (Tuple tuple : inputWindow.get()) { |
| sum += tuple.getIntegerByField("value"); |
| } |
| state.put("sum", sum); |
| collector.emit(new Values(sum)); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("sum")); |
| } |
| } |
| |
| } |