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.task.TopologyContext;
  import storm.trident.topology.TransactionAttempt;
  import backtype.storm.tuple.Fields;
  import java.util.Map;
  import storm.trident.operation.TridentCollector;
  
  public class BatchSpoutExecutor implements ITridentSpout {
      public static class EmptyCoordinator implements BatchCoordinator {
          @Override
          public Object initializeTransaction(long txid, Object prevMetadata, Object currMetadata) {
              return null;
          }
  
          @Override
          public void close() {
          }
  
          @Override
          public void success(long txid) {
          }
  
          @Override
          public boolean isReady(long txid) {
              return true;
          }
      }
  
      public class BatchSpoutEmitter implements Emitter {
  
          @Override
          public void emitBatch(TransactionAttempt tx, Object coordinatorMeta, TridentCollector collector) {
              _spout.emitBatch(tx.getTransactionId(), collector);
          }
  
          @Override
          public void success(TransactionAttempt tx) {
              _spout.ack(tx.getTransactionId());
          }
  
          @Override
          public void close() {
              _spout.close();
          }
      }
  
      IBatchSpout _spout;
  
      public BatchSpoutExecutor(IBatchSpout spout) {
          _spout = spout;
      }
  
      @Override
      public BatchCoordinator getCoordinator(String txStateId, Map conf, TopologyContext context) {
          return new EmptyCoordinator();
      }
  
      @Override
      public Emitter getEmitter(String txStateId, Map conf, TopologyContext context) {
          _spout.open(conf, context);
          return new BatchSpoutEmitter();
      }
  
      @Override
      public Map getComponentConfiguration() {
          return _spout.getComponentConfiguration();
      }
  
      @Override
      public Fields getOutputFields() {
          return _spout.getOutputFields();
      }
  
  }
  