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 accord.maelstrom;
  
  import accord.api.Key;
  import accord.api.Write;
  import accord.local.SafeCommandStore;
  import accord.primitives.PartialTxn;
  import accord.primitives.Seekable;
  import accord.primitives.Timestamp;
  import accord.primitives.TxnId;
  import accord.utils.Timestamped;
  import accord.utils.async.AsyncChain;
  import accord.utils.async.AsyncChains;
  
  import java.util.TreeMap;
  
  public class MaelstromWrite extends TreeMap<Key, Value> implements Write
  {
      @Override
      public AsyncChain<Void> apply(SafeCommandStore safeStore, Seekable key, TxnId txnId, Timestamp executeAt, PartialTxn txn)
      {
          MaelstromStore dataStore = (MaelstromStore) safeStore.dataStore();
          if (containsKey(key))
              dataStore.data.merge((Key)key, new Timestamped<>(executeAt, get(key), Value::toString), Timestamped::merge);
          return AsyncChains.success(null);
      }
  }
  