// Copyright © 2004, 2010, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET 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

using System;
using System.Diagnostics;
using MySql.Data.MySqlClient.Properties;

namespace MySql.Data.MySqlClient
{
  internal class SystemPerformanceMonitor : PerformanceMonitor
  {
    private static PerformanceCounter procedureHardQueries;
    private static PerformanceCounter procedureSoftQueries;

    public SystemPerformanceMonitor(MySqlConnection connection) : base(connection)
    {
      string categoryName = Resources.PerfMonCategoryName;

      if (connection.Settings.UsePerformanceMonitor && procedureHardQueries == null)
      {
        try
        {
          procedureHardQueries = new PerformanceCounter(categoryName,
                                                        "HardProcedureQueries", false);
          procedureSoftQueries = new PerformanceCounter(categoryName,
                                                        "SoftProcedureQueries", false);
        }
        catch (Exception ex)
        {
          MySqlTrace.LogError(connection.ServerThread, ex.Message);
        }
      }
    }

#if DEBUG
    private void EnsurePerfCategoryExist()
    {
      CounterCreationDataCollection ccdc = new CounterCreationDataCollection();
      CounterCreationData ccd = new CounterCreationData();
      ccd.CounterType = PerformanceCounterType.NumberOfItems32;
      ccd.CounterName = "HardProcedureQueries";
      ccdc.Add(ccd);

      ccd = new CounterCreationData();
      ccd.CounterType = PerformanceCounterType.NumberOfItems32;
      ccd.CounterName = "SoftProcedureQueries";
      ccdc.Add(ccd);

      if (!PerformanceCounterCategory.Exists(Resources.PerfMonCategoryName))
        PerformanceCounterCategory.Create(Resources.PerfMonCategoryName, null, ccdc);
    }
#endif

    public void AddHardProcedureQuery()
    {
      if (!Connection.Settings.UsePerformanceMonitor ||
          procedureHardQueries == null) return;
      procedureHardQueries.Increment();
    }

    public void AddSoftProcedureQuery()
    {
      if (!Connection.Settings.UsePerformanceMonitor ||
          procedureSoftQueries == null) return;
      procedureSoftQueries.Increment();
    }
  }
}