eco-storm-examples/src/java/com/twitter/heron/examples/eco/TestFibonacciSpout.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 java.util.Random;
import java.util.logging.Logger;

import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.Utils;

@SuppressWarnings({"serial", "rawtypes", "HiddenField"})
public class TestFibonacciSpout extends BaseRichSpout {
  private static final Logger LOG = Logger.getLogger(TestFibonacciSpout.class.getName());
  private TestPropertyHolder holder;
  private SpoutOutputCollector collector;

  public TestFibonacciSpout(TestPropertyHolder holder) {
    this.holder = holder;
  }

  @Override
  public void open(Map<String, Object> conf, TopologyContext context,
                   SpoutOutputCollector collector) {
    this.collector = collector;
  }

  @Override
  public void nextTuple() {
    Utils.sleep(100);
    final int[] words = new int[] {0, 1, 2, 3, 5, 8, 13, 21, 34};
    final Random rand = new Random();
    final int number = words[rand.nextInt(words.length)];
    final String property = holder.getProperty();
    final int numberProperty = holder.getNumberProperty();
    final String publicProperty = holder.publicProperty;
    LOG.info("Constructor Args: " + property);
    LOG.info("Property set by setter: " + numberProperty);
    LOG.info("Property set by public field: " + publicProperty);
    LOG.info("Emitting: number " + number);
    collector.emit(new Values(number));
  }

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