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ServerStatusDiffInterceptor.java

/*
 Copyright (c) 2007, 2010, 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.SQLException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

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

00038 public class ServerStatusDiffInterceptor implements StatementInterceptor {

      private Map preExecuteValues = new HashMap();

      private Map postExecuteValues = new HashMap();

00044       public void init(Connection conn, Properties props) throws SQLException {

      }

00048       public ResultSetInternalMethods postProcess(String sql,
                  Statement interceptedStatement,
                  ResultSetInternalMethods originalResultSet, Connection connection)
                  throws SQLException {

            if (connection.versionMeetsMinimum(5, 0, 2)) {
                  populateMapWithSessionStatusValues(connection, this.postExecuteValues);
      
                  connection.getLog().logInfo(
                              "Server status change for statement:\n"
                                          + Util.calculateDifferences(this.preExecuteValues,
                                                      this.postExecuteValues));
            }

            return null; // we don't actually modify a result set

      }

      private void populateMapWithSessionStatusValues(Connection connection,
                  Map toPopulate) throws SQLException {
            java.sql.Statement stmt = null;
            java.sql.ResultSet rs = null;

            try {
                  toPopulate.clear();

                  stmt = connection.createStatement();
                  rs = stmt.executeQuery("SHOW SESSION STATUS");
                  Util.resultSetToMap(toPopulate, rs);
            } finally {
                  if (rs != null) {
                        rs.close();
                  }

                  if (stmt != null) {
                        stmt.close();
                  }
            }
      }

00088       public ResultSetInternalMethods preProcess(String sql,
                  Statement interceptedStatement, Connection connection)
                  throws SQLException {

            if (connection.versionMeetsMinimum(5, 0, 2)) {
                  populateMapWithSessionStatusValues(connection,
                              this.preExecuteValues);
            }

            return null; // we don't actually modify a result set
      }

00100       public boolean executeTopLevelOnly() {
            return true;
      }

00104       public void destroy() {
            
      }
}

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