eco-storm-examples/src/java/org/apache/heron/examples/eco/TestNameSpout.java

/**
 * 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.HashMap;
import java.util.Map;
import java.util.Random;

import org.apache.storm.Config;
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", "HiddenField"})
public class TestNameSpout extends BaseRichSpout {
  private boolean isdistributed;
  private SpoutOutputCollector collector;

  public TestNameSpout() {
    this(true);
  }

  public TestNameSpout(boolean isDistributed) {
    isdistributed = isDistributed;
  }

  public void open(Map conf, TopologyContext context,
                   SpoutOutputCollector collector) {
    this.collector = collector;
  }

  public void close() {

  }

  public void nextTuple() {
    Utils.sleep(100);
    final String[] words = new String[] {"marge", "homer", "bart", "simpson", "lisa"};
    final Random rand = new Random();
    final String word = words[rand.nextInt(words.length)];
    collector.emit(new Values(word));
  }

  public void ack(Object msgId) {

  }

  public void fail(Object msgId) {

  }

  public void declareOutputFields(OutputFieldsDeclarer declarer) {
    declarer.declare(new Fields("name"));
  }

  @Override
  public Map<String, Object> getComponentConfiguration() {
    if (!isdistributed) {
      Map<String, Object> ret = new HashMap<String, Object>();
      ret.put(Config.TOPOLOGY_WORKERS, 1);
      return ret;
    } else {
      return null;
    }
  }
}