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.api;
  
  import javax.annotation.Nullable;
  
  import accord.primitives.Participants;
  import accord.primitives.Ranges;
  import accord.primitives.Seekables;
  import accord.primitives.Timestamp;
  
  /**
   * A client-defined update operation (the write equivalent of a query).
   * Takes as input the data returned by {@code Read}, and returns a {@code Write}
   * representing new information to distributed to each shard's stores.
   *
   * Update will be invoked after Query at a coordinator
   */
  public interface Update extends Sliceable<Update>
  {
      Seekables<?, ?> keys();
      // null is provided only if nothing was read
      Write apply(Timestamp executeAt, @Nullable Data data);
      Update slice(Ranges ranges);
      Update intersecting(Participants<?> participants);
      Update merge(Update other);
  
  }
  