code: /*
   * 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.skywalking.oap.server.core.storage.type;
  
  import java.util.List;
  
  /**
   * A function supplier to accept key-value pair, and convert to the expected database structure according to storage
   * implementation.
   *
   * @param <R> Type of database required structure.
   */
  public interface Convert2Storage<R> {
      /**
       * Accept general type key/value.
       */
      void accept(String fieldName, Object fieldValue);
  
      /**
       * Accept String key and byte array value.
       */
      void accept(String fieldName, byte[] fieldValue);
  
      /**
       * Accept String key and String list value.
       */
      void accept(String fieldName, List<String> fieldValue);
  
      Object get(String fieldName);
  
      /**
       * @return the converted data
       */
      R obtain();
  }