/** * 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 org.apache.storm.Config; import org.apache.storm.StormSubmitter; import org.apache.storm.starter.bolt.SingleJoinBolt; import org.apache.storm.testing.FeederSpout; import org.apache.storm.topology.TopologyBuilder; import org.apache.storm.tuple.Fields; import org.apache.storm.tuple.Values; import org.apache.storm.utils.NimbusClient; /** Example of using a simple custom join bolt * NOTE: Prefer to use the built-in JoinBolt wherever applicable */ public class SingleJoinExample { public static void main(String[] args) throws Exception { if (!NimbusClient.isLocalOverride()) { throw new IllegalStateException("This example only works in local mode. " + "Run with storm local not storm jar"); } FeederSpout genderSpout = new FeederSpout(new Fields("id", "gender")); FeederSpout ageSpout = new FeederSpout(new Fields("id", "age")); TopologyBuilder builder = new TopologyBuilder(); builder.setSpout("gender", genderSpout); builder.setSpout("age", ageSpout); builder.setBolt("join", new SingleJoinBolt(new Fields("gender", "age"))).fieldsGrouping("gender", new Fields("id")) .fieldsGrouping("age", new Fields("id")); Config conf = new Config(); conf.setDebug(true); StormSubmitter.submitTopology("join-example", conf, builder.createTopology()); for (int i = 0; i < 10; i++) { String gender; if (i % 2 == 0) { gender = "male"; } else { gender = "female"; } genderSpout.feed(new Values(i, gender)); } for (int i = 9; i >= 0; i--) { ageSpout.feed(new Values(i, i + 20)); } } }