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 org.apache.bifromq.basekv.store.api;
  
  import org.apache.bifromq.basekv.proto.Boundary;
  import com.google.protobuf.ByteString;
  
  public interface IKVWriter {
  
      void delete(ByteString key);
  
      void clear(Boundary boundary);
  
      /**
       * Insert a non-exist key value pair, if the key is already exist, the result is undefined.
       *
       * @param key
       * @param value
       */
      void insert(ByteString key, ByteString value);
  
      /**
       * Put a key value pair, if the key is existed, its value will be overridden.
       *
       * @param key
       * @param value
       */
      void put(ByteString key, ByteString value);
  }
  