examples/src/java/com/twitter/heron/examples/eco/TestWindowBolt.java

//  Copyright 2018 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.examples.eco;

import java.util.Map;

import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseWindowedBolt;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.windowing.TupleWindow;

@SuppressWarnings({"serial", "HiddenField"})
public class TestWindowBolt extends BaseWindowedBolt {
  private OutputCollector collector;


  @Override
  public void prepare(Map<String, Object> topoConf, TopologyContext context,
                      OutputCollector collector) {
    this.collector = collector;
  }

  @Override
  public void execute(TupleWindow inputWindow) {
    collector.emit(new Values(inputWindow.get().size()));
  }

  @Override
  public void declareOutputFields(OutputFieldsDeclarer declarer) {
    declarer.declare(new Fields("count"));
  }
}