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Sourcecode: mysql-connector-java version File versions  Download package

ProfilerEventHandlerFactory.java

/*
 Copyright (c) 2002, 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;

import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import com.mysql.jdbc.log.Log;
import com.mysql.jdbc.profiler.ProfilerEventHandler;

/**
 * @author mmatthew
 */
00037 public class ProfilerEventHandlerFactory {

      private static final Map CONNECTIONS_TO_SINKS = new HashMap();

      private Connection ownerConnection = null;

      private Log log = null;

      /**
       * Returns the ProfilerEventHandlerFactory that handles profiler events for the given
       * connection.
       * 
       * @param conn
       *            the connection to handle events for
       * @return the ProfilerEventHandlerFactory that handles profiler events
       */
00053       public static synchronized ProfilerEventHandler getInstance(MySQLConnection conn) throws SQLException {
            ProfilerEventHandler handler = (ProfilerEventHandler) CONNECTIONS_TO_SINKS
                        .get(conn);

            if (handler == null) {
                  handler = (ProfilerEventHandler)Util.getInstance(conn.getProfilerEventHandler(), new Class[0], new Object[0], conn.getExceptionInterceptor());
                  
                  // we do it this way to not require
                  // exposing the connection properties 
                  // for all who utilize it
                  conn.initializeExtension(handler);
                  
                  CONNECTIONS_TO_SINKS.put(conn, handler);
            }

            return handler;
      }

      public static synchronized void removeInstance(Connection conn) {
            ProfilerEventHandler handler = (ProfilerEventHandler) CONNECTIONS_TO_SINKS.remove(conn);
            
            if (handler != null) {
                  handler.destroy();
            }
      }

      private ProfilerEventHandlerFactory(Connection conn) {
            this.ownerConnection = conn;

            try {
                  this.log = this.ownerConnection.getLog();
            } catch (SQLException sqlEx) {
                  throw new RuntimeException("Unable to get logger from connection");
            }
      }
}

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