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// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// 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.Collections;
using System.Diagnostics;
using System.Collections.Generic;
using System.Threading;
using MySql.Data.MySqlClient.Properties;
namespace MySql.Data.MySqlClient
{
/// <summary>
/// Summary description for MySqlPoolManager.
/// </summary>
internal class MySqlPoolManager
{
private static Hashtable pools = new Hashtable();
private static List<MySqlPool> clearingPools = new List<MySqlPool>();
// Timeout in seconds, after which an unused (idle) connection
// should be closed.
static internal int maxConnectionIdleTime = 180;
private static Timer timer = new Timer(new TimerCallback(CleanIdleConnections),
null, maxConnectionIdleTime*1000, maxConnectionIdleTime*1000);
private static string GetKey(MySqlConnectionStringBuilder settings)
{
string key = settings.ConnectionString;
#if !CF
if(settings.IntegratedSecurity && !settings.ConnectionReset)
{
try
{
// Append SID to the connection string to generate a key
// With Integrated security different Windows users with the same
// connection string may be mapped to different MySQL accounts.
System.Security.Principal.WindowsIdentity id =
System.Security.Principal.WindowsIdentity.GetCurrent();
key += ";" + id.User;
}
catch (System.Security.SecurityException ex)
{
// Documentation for WindowsIdentity.GetCurrent() states
// SecurityException can be thrown. In this case the
// connection can only be pooled if reset is done.
throw new MySqlException(Resources.NoWindowsIdentity, ex );
}
}
#endif
return key;
}
public static MySqlPool GetPool(MySqlConnectionStringBuilder settings)
{
string text = GetKey(settings);
lock (pools.SyncRoot)
{
MySqlPool pool = (pools[text] as MySqlPool);
if (pool == null)
{
pool = new MySqlPool(settings);
pools.Add(text, pool);
}
else
pool.Settings = settings;
return pool;
}
}
public static void RemoveConnection(Driver driver)
{
Debug.Assert(driver != null);
MySqlPool pool = driver.Pool;
if (pool == null) return;
pool.RemoveConnection(driver);
}
public static void ReleaseConnection(Driver driver)
{
Debug.Assert(driver != null);
MySqlPool pool = driver.Pool;
if (pool == null) return;
pool.ReleaseConnection(driver);
}
public static void ClearPool(MySqlConnectionStringBuilder settings)
{
Debug.Assert(settings != null);
string text;
try
{
text = GetKey(settings);
}
catch (MySqlException)
{
// Cannot retrieve windows identity for IntegratedSecurity=true
// This can be ignored.
return;
}
ClearPoolByText(text);
}
private static void ClearPoolByText(string key)
{
lock (pools.SyncRoot)
{
// if pools doesn't have it, then this pool must already have been cleared
if (!pools.ContainsKey(key)) return;
// add the pool to our list of pools being cleared
MySqlPool pool = (pools[key] as MySqlPool);
clearingPools.Add(pool);
// now tell the pool to clear itself
pool.Clear();
// and then remove the pool from the active pools list
pools.Remove(key);
}
}
public static void ClearAllPools()
{
lock (pools.SyncRoot)
{
// Create separate keys list.
List<string> keys = new List<string>(pools.Count);
foreach (string key in pools.Keys)
keys.Add(key);
// Remove all pools by key.
foreach (string key in keys)
ClearPoolByText(key);
}
}
public static void RemoveClearedPool(MySqlPool pool)
{
Debug.Assert(clearingPools.Contains(pool));
clearingPools.Remove(pool);
}
/// <summary>
/// Remove drivers that have been idle for too long.
/// </summary>
public static void CleanIdleConnections(object obj)
{
List<Driver> oldDrivers = new List<Driver>();
lock (pools.SyncRoot)
{
foreach (string key in pools.Keys)
{
MySqlPool pool = (pools[key] as MySqlPool);
oldDrivers.AddRange(pool.RemoveOldIdleConnections());
}
}
foreach(Driver driver in oldDrivers)
{
driver.Close();
}
}
}
}
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