/*
    * 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.data.pipeline.core.datasource;
  
  import lombok.extern.slf4j.Slf4j;
  import org.apache.shardingsphere.data.pipeline.api.PipelineDataSourceConfiguration;
  
  import java.sql.SQLException;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Pipeline data source manager.
   */
  @Slf4j
  public final class PipelineDataSourceManager implements AutoCloseable {
      
      private final Map<PipelineDataSourceConfiguration, PipelineDataSourceWrapper> cachedDataSources = new ConcurrentHashMap<>();
      
      /**
       * Get cached data source.
       *
       * @param dataSourceConfig data source configuration
       * @return data source
       */
      public PipelineDataSourceWrapper getDataSource(final PipelineDataSourceConfiguration dataSourceConfig) {
          PipelineDataSourceWrapper result = cachedDataSources.get(dataSourceConfig);
          if (null != result) {
              return result;
          }
          synchronized (cachedDataSources) {
              result = cachedDataSources.get(dataSourceConfig);
              if (null != result) {
                  if (!result.isClosed()) {
                      return result;
                  }
                  log.warn("{} is already closed, create again.", result);
              }
              result = new PipelineDataSourceWrapper(dataSourceConfig);
              cachedDataSources.put(dataSourceConfig, result);
              return result;
          }
      }
      
      @Override
      public void close() {
          for (PipelineDataSourceWrapper each : cachedDataSources.values()) {
              if (each.isClosed()) {
                  continue;
              }
              try {
                  each.close();
              } catch (final SQLException ex) {
                  log.error("An exception occurred while closing the data source.", ex);
              }
          }
          cachedDataSources.clear();
      }
  }