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SessionAssociationInterceptor.java

/*
 Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA



 */

package com.mysql.jdbc.interceptors;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSetInternalMethods;
import com.mysql.jdbc.Statement;
import com.mysql.jdbc.StatementInterceptor;

00038 public class SessionAssociationInterceptor implements StatementInterceptor {

      protected String currentSessionKey;
      protected final static ThreadLocal sessionLocal = new ThreadLocal();
      
      public static final void setSessionKey(String key) {
            sessionLocal.set(key);
      }
      
      public static final void resetSessionKey() {
            sessionLocal.set(null);
      }
      
      public static final String getSessionKey() {
            return (String)sessionLocal.get();
      }
      
00055       public boolean executeTopLevelOnly() {
            return true;
      }

00059       public void init(Connection conn, Properties props) throws SQLException {

      }

00063       public ResultSetInternalMethods postProcess(String sql,
                  Statement interceptedStatement,
                  ResultSetInternalMethods originalResultSet, Connection connection)
                  throws SQLException {
            return null;
      }

00070       public ResultSetInternalMethods preProcess(String sql,
                  Statement interceptedStatement, Connection connection)
                  throws SQLException {
            String key = getSessionKey();
            
            if (key != null && !key.equals(this.currentSessionKey)) {
                  PreparedStatement pstmt = connection.clientPrepareStatement("SET @mysql_proxy_session=?");
                  
                  try {
                        pstmt.setString(1, key);
                        pstmt.execute();
                  } finally {
                        pstmt.close();
                  }
                  
                  this.currentSessionKey = key;
            }
            
            return null;
      }

00091       public void destroy() {
            
      }
}

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