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 storm.trident.spout;
  
  import backtype.storm.Config;
  import backtype.storm.generated.Grouping;
  import backtype.storm.spout.ISpoutOutputCollector;
  import backtype.storm.spout.SpoutOutputCollector;
  import backtype.storm.task.ICollectorCallback;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.IRichSpout;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Values;
  import backtype.storm.utils.Utils;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Random;
  import java.util.Set;
  import storm.trident.topology.TridentBoltExecutor;
  import storm.trident.tuple.ConsList;
  import storm.trident.util.TridentUtils;
  
  public class RichSpoutBatchTriggerer implements IRichSpout {
  
      String _stream;
      IRichSpout _delegate;
      List<Integer> _outputTasks;
      Random _rand;
      String _coordStream;
  
      public RichSpoutBatchTriggerer(IRichSpout delegate, String streamName, String batchGroup) {
          _delegate = delegate;
          _stream = streamName;
          _coordStream = TridentBoltExecutor.COORD_STREAM(batchGroup);
      }
  
      @Override
      public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
          _delegate.open(conf, context, new SpoutOutputCollector(new StreamOverrideCollector(collector)));
          _outputTasks = new ArrayList<>();
          for(String component: Utils.get(context.getThisTargets(),
                                          _coordStream,
                                          new HashMap<String, Grouping>()).keySet()) {
              _outputTasks.addAll(context.getComponentTasks(component));
          }
          _rand = new Random(Utils.secureRandomLong());
      }
  
      @Override
      public void close() {
          _delegate.close();
      }
  
      @Override
      public void activate() {
          _delegate.activate();
      }
  
      @Override
      public void deactivate() {
          _delegate.deactivate();
      }
  
      @Override
      public void nextTuple() {
          _delegate.nextTuple();
      }
  
      @Override
      public void ack(Object msgId) {
          Long batchId = _msgIdToBatchId.remove((Long) msgId);
          FinishCondition cond = _finishConditions.get(batchId);
          if (cond != null) {
              cond.vals.remove((Long) msgId);
              if (cond.vals.isEmpty()) {
                  _finishConditions.remove(batchId);
                  _delegate.ack(cond.msgId);
              }
          }
      }
  
      @Override
      public void fail(Object msgId) {
          Long batchId = _msgIdToBatchId.remove((Long) msgId);
          FinishCondition cond = _finishConditions.remove(batchId);
          if (cond != null) {
              _delegate.fail(cond.msgId);
          }
      }
  
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          Fields outFields = TridentUtils.getSingleOutputStreamFields(_delegate);
          outFields = TridentUtils.fieldsConcat(new Fields("$id$"), outFields);
          declarer.declareStream(_stream, outFields);
          // try to find a way to merge this code with what's already done in TridentBoltExecutor
          declarer.declareStream(_coordStream, true, new Fields("id", "count"));
      }
  
      @Override
      public Map<String, Object> getComponentConfiguration() {
          Map<String, Object> conf = _delegate.getComponentConfiguration();
          if(conf==null) conf = new HashMap<>();
          else conf = new HashMap<>(conf);
          Config.registerSerialization(conf, RichSpoutBatchId.class, RichSpoutBatchIdSerializer.class);
          return conf;
      }
      
      static class FinishCondition {
          Set<Long> vals = new HashSet<>();
          Object msgId;
      }
      
      Map<Long, Long> _msgIdToBatchId = new HashMap<>();
      
      Map<Long, FinishCondition> _finishConditions = new HashMap<>();
  
      
      class StreamOverrideCollector implements ISpoutOutputCollector {
          
          SpoutOutputCollector _collector;
  
          class CollectorCb implements ICollectorCallback {
  
              List<Integer> tasks;
  
              public CollectorCb(List<Integer> tasks) {
                  this.tasks = tasks;
              }
  
              @Override
              public void execute(String stream, List<Integer> outTasks, List values) {
                  // TODO Auto-generated method stub
                  tasks.addAll(outTasks);
              }
          }
          
          public StreamOverrideCollector(SpoutOutputCollector collector) {
              _collector = collector;
          }
  
          @Override
          public List<Integer> emit(String ignore, List<Object> values, Object msgId) {
              long batchIdVal = _rand.nextLong();
              Object batchId = new RichSpoutBatchId(batchIdVal);
              FinishCondition finish = new FinishCondition();
              finish.msgId = msgId;
              List<Integer> tasks = new ArrayList<>();
              _collector.emit(_stream, new ConsList(batchId, values), new CollectorCb(tasks));
              _collector.flush();
              Set<Integer> outTasksSet = new HashSet<>(tasks);
              for(Integer t: _outputTasks) {
                  int count = 0;
                  if(outTasksSet.contains(t)) {
                      count = 1;
                  }
                  long r = _rand.nextLong();
                  _collector.emitDirect(t, _coordStream, new Values(batchId, count), r);
                  finish.vals.add(r);
                  _msgIdToBatchId.put(r, batchIdVal);
              }
              _finishConditions.put(batchIdVal, finish);
              return tasks;
          }
  
          @Override
          public void emitDirect(int task, String ignore, List<Object> values, Object msgId) {
              throw new RuntimeException("Trident does not support direct emits from spouts");
          }
  
          @Override
          public void reportError(Throwable t) {
              _collector.reportError(t);
          }
          
          
          public long getPendingCount() {
              //return _collector.getPendingCount();
          	return 0l;
          }
      }
  }
  