/*
    * 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.shardingsphere.proxy.backend.connector.jdbc.executor;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.executor.kernel.model.ExecutionGroupContext;
  import org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutionUnit;
  import org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutor;
  import org.apache.shardingsphere.infra.executor.sql.execute.result.ExecuteResult;
  import org.apache.shardingsphere.infra.executor.sql.process.ProcessEngine;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.session.query.QueryContext;
  import org.apache.shardingsphere.mode.metadata.MetaDataContexts;
  import org.apache.shardingsphere.proxy.backend.connector.DatabaseConnector;
  import org.apache.shardingsphere.proxy.backend.connector.jdbc.executor.callback.ProxyJDBCExecutorCallbackFactory;
  import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
  import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
  
  import java.sql.SQLException;
  import java.util.List;
  
  /**
   * Proxy JDBC executor.
   */
  @RequiredArgsConstructor
  public final class ProxyJDBCExecutor {
      
      private final String type;
      
      private final ConnectionSession connectionSession;
      
      private final DatabaseConnector databaseConnector;
      
      private final JDBCExecutor jdbcExecutor;
      
      private final ProcessEngine processEngine = new ProcessEngine();
      
      /**
       * Execute.
       * 
       * @param queryContext query context
       * @param executionGroupContext execution group context
       * @param isReturnGeneratedKeys is return generated keys
       * @param isExceptionThrown is exception thrown
       * @return execute results
       * @throws SQLException SQL exception
       */
      public List<ExecuteResult> execute(final QueryContext queryContext, final ExecutionGroupContext<JDBCExecutionUnit> executionGroupContext,
                                         final boolean isReturnGeneratedKeys, final boolean isExceptionThrown) throws SQLException {
          try {
              MetaDataContexts metaDataContexts = ProxyContext.getInstance().getContextManager().getMetaDataContexts();
              ShardingSphereDatabase database = metaDataContexts.getMetaData().getDatabase(connectionSession.getDatabaseName());
              DatabaseType protocolType = database.getProtocolType();
              processEngine.executeSQL(executionGroupContext, queryContext);
              SQLStatementContext context = queryContext.getSqlStatementContext();
              return jdbcExecutor.execute(executionGroupContext,
                      ProxyJDBCExecutorCallbackFactory.newInstance(type, protocolType, database.getResourceMetaData(), context.getSqlStatement(), databaseConnector, isReturnGeneratedKeys,
                              isExceptionThrown,
                              true),
                      ProxyJDBCExecutorCallbackFactory.newInstance(type, protocolType, database.getResourceMetaData(), context.getSqlStatement(), databaseConnector, isReturnGeneratedKeys,
                              isExceptionThrown,
                              false));
          } finally {
              processEngine.completeSQLExecution(executionGroupContext.getReportContext().getProcessId());
          }
      }
  }