/*
    * 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.infra.datasource.pool.destroyer;
  
  import lombok.RequiredArgsConstructor;
  import lombok.SneakyThrows;
  import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
  
  import javax.sql.DataSource;
  import java.sql.SQLException;
  import java.util.Optional;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  /**
   * Data source pool destroyer.
   */
  @RequiredArgsConstructor
  public final class DataSourcePoolDestroyer {
      
      private final DataSource dataSource;
      
      /**
       * Asynchronous destroy data source pool gracefully.
       */
      public void asyncDestroy() {
          if (!(dataSource instanceof AutoCloseable)) {
              return;
          }
          ExecutorService executor = Executors.newSingleThreadExecutor();
          executor.execute(this::graceDestroy);
          executor.shutdown();
      }
      
      @SneakyThrows
      private void graceDestroy() {
          waitUntilActiveConnectionComplete();
          ((AutoCloseable) dataSource).close();
      }
      
      private void waitUntilActiveConnectionComplete() throws SQLException {
          Optional<DataSourcePoolActiveDetector> activeDetector = TypedSPILoader.findService(DataSourcePoolActiveDetector.class, dataSource.getClass().getName());
          while (activeDetector.isPresent() && activeDetector.get().containsActiveConnection(dataSource)) {
              try {
                  Thread.sleep(10L);
              } catch (final InterruptedException ignore) {
                  Thread.currentThread().interrupt();
              }
          }
      }
  }