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;
  
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import org.apache.skywalking.oap.server.library.client.request.InsertRequest;
  import org.apache.skywalking.oap.server.library.client.request.PrepareRequest;
  
  /**
   * IBatchDAO provides two modes of data persistence supported by most databases, including pure insert and batch hybrid
   * insert/update.
   */
  public interface IBatchDAO extends DAO {
      /**
       * Push data into the database in async mode. This method is driven by streaming process. This method doesn't
       * request the data queryable immediately after the method finished.
       *
       * @param insertRequest data to insert.
       */
      void insert(InsertRequest insertRequest);
  
      /**
       * Push data collection into the database in async mode. This method is driven by streaming process. This method
       * doesn't request the data queryable immediately after the method finished.
       *
       * The method requires thread safe. The OAP core would call this concurrently.
       *
       * @param prepareRequests data to insert or update. No delete happens in streaming mode.
       */
      CompletableFuture<Void> flush(List<PrepareRequest> prepareRequests);
  
      /**
       * End of flush is an event to notify the whole flush period is ending.
       * This provides a time point to do clean up works.
       *
       * @since 9.2.0
       */
      default void endOfFlush() {
  
      }
  }
  