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.storage.plugin.jdbc;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.core.storage.SessionCacheCallback;
  import org.apache.skywalking.oap.server.library.client.request.InsertRequest;
  import org.apache.skywalking.oap.server.library.client.request.UpdateRequest;
  
  import java.sql.Connection;
  import java.sql.PreparedStatement;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * A SQL executor.
   */
  @EqualsAndHashCode(of = "sql")
  @RequiredArgsConstructor
  @Slf4j
  public class SQLExecutor implements InsertRequest, UpdateRequest {
      private final String sql;
      @Getter
      private final List<Object> param;
      private final SessionCacheCallback callback;
      @Getter
      private List<SQLExecutor> additionalSQLs;
  
      public void invoke(Connection connection) throws SQLException {
          final var preparedStatement = connection.prepareStatement(sql);
          setParameters(preparedStatement);
          if (log.isDebugEnabled()) {
              log.debug("Executing sql in batch: {}, parameters: {}", sql, param);
          }
          preparedStatement.execute();
          if (additionalSQLs != null) {
              for (SQLExecutor sqlExecutor : additionalSQLs) {
                  sqlExecutor.invoke(connection);
              }
          }
      }
  
      public void setParameters(PreparedStatement preparedStatement) throws SQLException {
          for (int i = 0; i < param.size(); i++) {
              preparedStatement.setObject(i + 1, param.get(i));
          }
      }
  
      @Override
      public String toString() {
          return sql;
      }
  
      public void appendAdditionalSQLs(List<SQLExecutor> sqlExecutors) {
          if (additionalSQLs == null) {
              additionalSQLs = new ArrayList<>();
          }
          additionalSQLs.addAll(sqlExecutors);
      }
  
      @Override
      public void onInsertCompleted() {
          if (callback != null)
              callback.onInsertCompleted();
      }
  
      @Override
      public void onUpdateFailure() {
          if (callback != null)
              callback.onUpdateFailure();
      }
  }
  