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.operation.builtin;
  
  import backtype.storm.tuple.Values;
  import java.util.ArrayList;
  import java.util.List;
  import storm.trident.operation.TridentCollector;
  import storm.trident.state.BaseQueryFunction;
  import storm.trident.state.snapshot.ReadOnlySnapshottable;
  import storm.trident.tuple.TridentTuple;
  
  public class SnapshotGet extends BaseQueryFunction<ReadOnlySnapshottable, Object> {
  
      @Override
      public List<Object> batchRetrieve(ReadOnlySnapshottable state, List<TridentTuple> args) {
          List<Object> ret = new ArrayList<Object>(args.size());
          Object snapshot = state.get();
          for (TridentTuple arg : args) {
              ret.add(snapshot);
          }
          return ret;
      }
  
      @Override
      public void execute(TridentTuple tuple, Object result, TridentCollector collector) {
          collector.emit(new Values(result));
      }
  }
  