| /** |
| * 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 java.util.logging.Logger; |
| |
| import org.apache.heron.api.spout.BaseRichSpout; |
| import org.apache.heron.api.spout.SpoutOutputCollector; |
| import org.apache.heron.api.state.State; |
| import org.apache.heron.api.topology.IStatefulComponent; |
| 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; |
| import org.apache.heron.api.utils.Utils; |
| |
| @SuppressWarnings("HiddenField") |
| public class StatefulNumberSpout extends BaseRichSpout |
| implements IStatefulComponent<String, Long> { |
| private static final Logger LOG = Logger.getLogger(StatefulNumberSpout.class.getName()); |
| private static final long serialVersionUID = 5454291010750852782L; |
| private SpoutOutputCollector collector; |
| private Random rand; |
| private long msgId; |
| private State<String, Long> state; |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("value", "ts", "msgid")); |
| } |
| |
| @Override |
| public void open(Map<String, Object> conf, TopologyContext context, SpoutOutputCollector |
| collector) { |
| this.collector = collector; |
| this.rand = new Random(); |
| } |
| |
| @Override |
| public void nextTuple() { |
| Utils.sleep(1000); |
| long val = msgId; |
| long randomNumber = System.currentTimeMillis() - (24 * 60 * 60 * 1000); |
| System.out.println("Emitting: " + val); |
| collector.emit(new Values(val, |
| randomNumber, msgId), msgId); |
| msgId++; |
| } |
| |
| @Override |
| public void ack(Object msgId) { |
| LOG.fine("Got ACK for msgId : " + msgId); |
| } |
| |
| @Override |
| public void fail(Object msgId) { |
| LOG.fine("Got FAIL for msgId : " + msgId); |
| } |
| |
| @Override |
| public void initState(State<String, Long> state) { |
| this.state = state; |
| this.msgId = this.state.getOrDefault("msgId", 0L); |
| } |
| |
| @Override |
| public void preSave(String checkpointId) { |
| this.state.put("msgId", msgId); |
| } |
| } |