content: /**
   * 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 com.jstorm.example.unittests.window;
  
  import backtype.storm.Config;
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.base.BaseRichBolt;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Values;
  import backtype.storm.utils.TupleUtils;
  import org.apache.storm.starter.tools.NthLastModifiedTimeTracker;
  import org.apache.storm.starter.tools.SlidingWindowCounter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * @author binyang.dby on 2016/7/11.
   */
  public class WindowTestRollingCountBolt extends BaseRichBolt {
      private static Logger LOG = LoggerFactory.getLogger("WindowTestRollingCountBolt");
  
      private SlidingWindowCounter<Object> counter;
      private int windowLengthInSeconds;
      private int emitFrequencyInSeconds;
      private int slots;
      private OutputCollector collector;
      private NthLastModifiedTimeTracker lastModifiedTracker;
  
      public WindowTestRollingCountBolt(int windowLengthInSeconds, int emitFrequencyInSeconds) {
          this.windowLengthInSeconds = windowLengthInSeconds;
          this.emitFrequencyInSeconds = emitFrequencyInSeconds;
  
          if (windowLengthInSeconds % emitFrequencyInSeconds != 0)
              throw new IllegalArgumentException("WindowLengthInSeconds should be times of EmitFrequencyInSeconds!");
          this.slots = windowLengthInSeconds / emitFrequencyInSeconds;
          this.counter = new SlidingWindowCounter<Object>(slots);
      }
  
      @Override
      public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
          this.collector = collector;
          this.lastModifiedTracker = new NthLastModifiedTimeTracker(slots);
      }
  
      @Override
      public void execute(Tuple input) {
          if (TupleUtils.isTick(input)) {
              System.out.println("### tuple = isTick");
              emitCurrentWindowCounts();
          } else {
              countObjAndAck(input);
          }
      }
  
      private void emitCurrentWindowCounts() {
          Map<Object, Long> counts = counter.getCountsThenAdvanceWindow();
          int actualWindowLengthInSeconds = lastModifiedTracker.secondsSinceOldestModification();
          lastModifiedTracker.markAsModified();
          if (actualWindowLengthInSeconds != windowLengthInSeconds) {
              //LOG.warn(String.format(WINDOW_LENGTH_WARNING_TEMPLATE, actualWindowLengthInSeconds, windowLengthInSeconds));
          }
          emit(counts, actualWindowLengthInSeconds);
      }
  
      private void emit(Map<Object, Long> counts, int actualWindowLengthInSeconds) {
          for (Map.Entry<Object, Long> entry : counts.entrySet()) {
              Object obj = entry.getKey();
              Long count = entry.getValue();
              collector.emit(new Values(obj, count, actualWindowLengthInSeconds));
          }
      }
  
      private void countObjAndAck(Tuple tuple) {
          Object obj = tuple.getValue(0);
          counter.incrementCount(obj);
          collector.ack(tuple);
      }
  
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("obj", "count", "actualWindowLengthInSeconds"));
      }
  
      @Override
      public Map<String, Object> getComponentConfiguration() {
          LOG.info("%%%% getComponentConfiguration");
          Map<String, Object> conf = new HashMap<String, Object>();
          conf.put(Config.TOPOLOGY_TICK_TUPLE_FREQ_SECS, emitFrequencyInSeconds);
          return conf;
      }
  }
  