/**
    *    Copyright 2009-2015 the original author or authors.
    *
    *    Licensed 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.ibatis.transaction.managed;
  
  import java.sql.Connection;
  import java.sql.SQLException;
  
  import javax.sql.DataSource;
  
  import org.apache.ibatis.logging.Log;
  import org.apache.ibatis.logging.LogFactory;
  import org.apache.ibatis.session.TransactionIsolationLevel;
  import org.apache.ibatis.transaction.Transaction;
  
  /**
   * {@link Transaction} that lets the container manage the full lifecycle of the transaction.
   * Delays connection retrieval until getConnection() is called.
   * Ignores all commit or rollback requests.
   * By default, it closes the connection but can be configured not to do it.
   *
   * @see ManagedTransactionFactory
   */
  /**
   * @author Clinton Begin
   */
  public class ManagedTransaction implements Transaction {
  
    private static final Log log = LogFactory.getLog(ManagedTransaction.class);
  
    private DataSource dataSource;
    private TransactionIsolationLevel level;
    private Connection connection;
    private boolean closeConnection;
  
    public ManagedTransaction(Connection connection, boolean closeConnection) {
      this.connection = connection;
      this.closeConnection = closeConnection;
    }
  
    public ManagedTransaction(DataSource ds, TransactionIsolationLevel level, boolean closeConnection) {
      this.dataSource = ds;
      this.level = level;
      this.closeConnection = closeConnection;
    }
  
    @Override
    public Connection getConnection() throws SQLException {
      if (this.connection == null) {
        openConnection();
      }
      return this.connection;
    }
  
    @Override
    public void commit() throws SQLException {
      // Does nothing
    }
  
    @Override
    public void rollback() throws SQLException {
      // Does nothing
    }
  
    @Override
    public void close() throws SQLException {
      if (this.closeConnection && this.connection != null) {
        if (log.isDebugEnabled()) {
          log.debug("Closing JDBC Connection [" + this.connection + "]");
        }
        this.connection.close();
      }
    }
  
    protected void openConnection() throws SQLException {
      if (log.isDebugEnabled()) {
        log.debug("Opening JDBC Connection");
      }
      this.connection = this.dataSource.getConnection();
      if (this.level != null) {
        this.connection.setTransactionIsolation(this.level.getLevel());
      }
    }
  
  }