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.state;
  
  import java.util.List;
  import storm.trident.operation.Operation;
  import storm.trident.operation.TridentCollector;
  import storm.trident.tuple.TridentTuple;
  
  public interface StateUpdater<S extends State> extends Operation {
      // maybe it needs a start phase (where it can do a retrieval, an update phase, and then a finish phase...?
      // shouldn't really be a one-at-a-time interface, since we have all the tuples already?
      // TOOD: used for the new values stream
      // the list is needed to be able to get reduceragg and combineragg persistentaggregate
      // for grouped streams working efficiently
      void updateState(S state, List<TridentTuple> tuples, TridentCollector collector);
  }
  