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.testing;
  
  import backtype.storm.task.TopologyContext;
  import backtype.storm.tuple.Fields;
  import backtype.storm.utils.RegisteredGlobalState;
  import backtype.storm.utils.Utils;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.CopyOnWriteArrayList;
  import java.util.concurrent.Semaphore;
  import storm.trident.operation.TridentCollector;
  import storm.trident.spout.ITridentSpout;
  import storm.trident.topology.TransactionAttempt;
  import storm.trident.topology.TridentTopologyBuilder;
  
  public class FeederBatchSpout implements ITridentSpout, IFeeder {
  
      String _id;
      String _semaphoreId;
      Fields _outFields;
      boolean _waitToEmit = true;
  
      public FeederBatchSpout(List<String> fields) {
          _outFields = new Fields(fields);
          _id = RegisteredGlobalState.registerState(new CopyOnWriteArrayList());
          _semaphoreId = RegisteredGlobalState.registerState(new CopyOnWriteArrayList());
      }
  
      public void setWaitToEmit(boolean trueIfWait) {
          _waitToEmit = trueIfWait;
      }
  
      public void feed(Object tuples) {
          Semaphore sem = new Semaphore(0);
          ((List) RegisteredGlobalState.getState(_semaphoreId)).add(sem);
          ((List) RegisteredGlobalState.getState(_id)).add(tuples);
          try {
              sem.acquire();
          } catch (InterruptedException e) {
              throw new RuntimeException(e);
          }
      }
  
      public class FeederCoordinator implements ITridentSpout.BatchCoordinator<Map<Integer, List<List<Object>>>> {
  
          int _numPartitions;
          int _emittedIndex = 0;
          Map<Long, Integer> txIndices = new HashMap();
  
          public FeederCoordinator(int numPartitions) {
              _numPartitions = numPartitions;
          }
  
          @Override
          public Map<Integer, List<List<Object>>> initializeTransaction(long txid, Map<Integer, List<List<Object>>> prevMetadata, Map<Integer, List<List<Object>>> currMetadata) {
              if(currMetadata!=null) return currMetadata;
              List allBatches = (List) RegisteredGlobalState.getState(_id);
              if(allBatches.size()>_emittedIndex) {
                  Object batchInfo = allBatches.get(_emittedIndex);                
                  txIndices.put(txid, _emittedIndex);                
                  _emittedIndex += 1;
                  if(batchInfo instanceof Map) {
                      return (Map) batchInfo;
                  } else {
                      List batchList = (List) batchInfo;
                      Map<Integer, List<List<Object>>> partitions = new HashMap();
                      for (int i = 0; i < _numPartitions; i++) {
                          partitions.put(i, new ArrayList());
                      }
                      for (int i = 0; i < batchList.size(); i++) {
                          int partition = i % _numPartitions;
                          partitions.get(partition).add((List) batchList.get(i));
                      }
                      return partitions;
                  }
              } else {
                  return new HashMap();
              }
          }
  
          @Override
          public void close() {
          }
  
          @Override
          public void success(long txid) {
              Integer index = txIndices.get(txid);
              if (index != null) {
                  Semaphore sem = (Semaphore) ((List) RegisteredGlobalState.getState(_semaphoreId)).get(index);
                  sem.release();
              }
          }
  
          int _masterEmitted = 0;
          
          @Override
          public boolean isReady(long txid) {
              if(!_waitToEmit) return true;
              List allBatches = (List) RegisteredGlobalState.getState(_id);
              if(allBatches.size() > _masterEmitted) {
                  _masterEmitted++;
                  return true;
              } else {
                  Utils.sleep(2);
                  return false;
              }
          }
      }
      
      private static class FeederEmitter implements ITridentSpout.Emitter<Map<Integer, List<List<Object>>>> {
  
          int _index;
          
          public FeederEmitter(int index) {
              _index = index;
          }
  
          @Override
          public void emitBatch(TransactionAttempt tx, Map<Integer, List<List<Object>>> coordinatorMeta, TridentCollector collector) {
              List<List<Object>> tuples = coordinatorMeta.get(_index);
              if (tuples != null) {
                  for (List<Object> t : tuples) {
                      collector.emit(t);
                  }
              }
          }
  
          @Override
          public void success(TransactionAttempt tx) {
          }
  
          @Override
          public void close() {
          }        
      }
      
      
      @Override
      public Map<String, Object> getComponentConfiguration() {
          return null;
      }
  
      @Override
      public Fields getOutputFields() {
          return _outFields;
      }
  
      @Override
      public BatchCoordinator getCoordinator(String txStateId, Map conf, TopologyContext context) {
          int numTasks = context.getComponentTasks(
                              TridentTopologyBuilder.spoutIdFromCoordinatorId(
                                  context.getThisComponentId()))
                                      .size();
          return new FeederCoordinator(numTasks);
      }
  
      @Override
      public Emitter getEmitter(String txStateId, Map conf, TopologyContext context) {
          return new FeederEmitter(context.getThisTaskIndex());
      }
  
  }
  