| /** |
| * 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.heron.examples.eco; |
| |
| import java.util.Map; |
| import java.util.Random; |
| |
| import org.apache.heron.api.spout.BaseRichSpout; |
| import org.apache.heron.api.spout.SpoutOutputCollector; |
| import org.apache.heron.api.topology.OutputFieldsDeclarer; |
| import org.apache.heron.api.topology.TopologyContext; |
| import org.apache.heron.api.tuple.Fields; |
| import org.apache.heron.api.tuple.Values; |
| |
| @SuppressWarnings("HiddenField") |
| public class WordSpout extends BaseRichSpout { |
| private static final long serialVersionUID = 4322775001819135036L; |
| |
| private static final int ARRAY_LENGTH = 128 * 1024; |
| private static final int WORD_LENGTH = 20; |
| |
| private final String[] words = new String[ARRAY_LENGTH]; |
| |
| private final Random rnd = new Random(31); |
| |
| private SpoutOutputCollector collector; |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) { |
| outputFieldsDeclarer.declare(new Fields("word")); |
| } |
| |
| @Override |
| @SuppressWarnings("rawtypes") |
| public void open(Map map, TopologyContext topologyContext, |
| SpoutOutputCollector spoutOutputCollector) { |
| System.out.println("open spout"); |
| RandomString randomString = new RandomString(WORD_LENGTH); |
| |
| for (int i = 0; i < ARRAY_LENGTH; i++) { |
| words[i] = randomString.nextString(); |
| } |
| |
| collector = spoutOutputCollector; |
| } |
| |
| @Override |
| public void nextTuple() { |
| System.out.println("next tuple"); |
| int nextInt = rnd.nextInt(ARRAY_LENGTH); |
| collector.emit(new Values(words[nextInt])); |
| } |
| } |