content: /*
   * 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.camel.component.drill;
  
  import java.sql.Connection;
  import java.sql.DriverManager;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultProducer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A drill producer
   */
  public class DrillProducer extends DefaultProducer {
  
      private static final Logger LOG = LoggerFactory.getLogger(DrillProducer.class);
  
      private DrillEndpoint endpoint;
  
      private Connection connection;
  
      public DrillProducer(DrillEndpoint endpoint) {
          super(endpoint);
          this.endpoint = endpoint;
      }
  
      @Override
      protected void doStart() throws Exception {
          super.doStart();
  
          createJDBCConnection();
      }
  
      @Override
      protected void doStop() throws Exception {
          super.doStop();
  
          try {
              connection.close();
          } catch (Exception e) {
          }
      }
  
      @Override
      public void process(final Exchange exchange) throws Exception {
          final String query = exchange.getIn().getHeader(DrillConstants.DRILL_QUERY, String.class);
  
          // check query
          Statement st = null;
          ResultSet rs = null;
          try {
              st = connection.createStatement();
              rs = st.executeQuery(query);
  
              exchange.getIn().setBody(endpoint.queryForList(rs));
          } finally {
              try {
                  rs.close();
              } catch (Exception e) {
              }
              try {
                  st.close();
              } catch (Exception e) {
              }
          }
      } // end process
  
      private void createJDBCConnection() throws ClassNotFoundException, SQLException {
          Class.forName(DrillConstants.DRILL_DRIVER);
  
          if (LOG.isInfoEnabled()) {
              LOG.info("connection url: {}", endpoint.toJDBCUri());
          }
  
          this.connection = DriverManager.getConnection(endpoint.toJDBCUri());
      }
  }
  