| // Copyright 2016 Twitter. All rights reserved. |
| // |
| // Licensed 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 com.twitter.heron.integration_test.topology.serialization; |
| |
| import java.util.Map; |
| |
| import com.twitter.heron.api.spout.BaseRichSpout; |
| import com.twitter.heron.api.spout.SpoutOutputCollector; |
| import com.twitter.heron.api.topology.OutputFieldsDeclarer; |
| import com.twitter.heron.api.topology.TopologyContext; |
| import com.twitter.heron.api.tuple.Fields; |
| import com.twitter.heron.api.tuple.Values; |
| |
| /** |
| * A spout that emits two different custom objects continuously in order, |
| * one object every "nextTuple()" called |
| * Note that CustomObject uses Java serialization |
| */ |
| public class CustomSpout extends BaseRichSpout { |
| private static final long serialVersionUID = -5906196959214294058L; |
| private SpoutOutputCollector collector; |
| private int emitted = 0; |
| private CustomObject[] inputObjects; |
| |
| public CustomSpout(CustomObject[] inputObjects) { |
| this.inputObjects = inputObjects; |
| } |
| |
| @Override |
| public void open(Map<String, Object> conf, |
| TopologyContext context, |
| SpoutOutputCollector outputCollector) { |
| this.collector = outputCollector; |
| } |
| |
| @Override |
| public void nextTuple() { |
| CustomObject obj = inputObjects[(emitted++) % inputObjects.length]; |
| collector.emit(new Values(obj)); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("custom")); |
| } |
| } |