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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;
using System.Collections;
using System.Data;
using System.Collections.Generic;
using MySql.Data.MySqlClient.Properties;
using System.Diagnostics;
using System.Text;
using System.Globalization;
namespace MySql.Data.MySqlClient
{
internal class ProcedureCache
{
private Hashtable procHash;
private Queue<int> hashQueue;
private int maxSize;
public ProcedureCache(int size)
{
maxSize = size;
hashQueue = new Queue<int>(maxSize);
procHash = new Hashtable(maxSize);
}
public DataSet GetProcedure(MySqlConnection conn, string spName, string cacheKey)
{
DataSet ds = null;
if (cacheKey != null)
{
int hash = cacheKey.GetHashCode();
lock (procHash.SyncRoot)
{
ds = (DataSet)procHash[hash];
}
}
if (ds == null)
{
ds = AddNew(conn, spName);
#if !CF
conn.PerfMonitor.AddHardProcedureQuery();
#endif
if (conn.Settings.Logging)
MySqlTrace.LogInformation(conn.ServerThread,
String.Format(Resources.HardProcQuery, spName));
}
else
{
#if !CF
conn.PerfMonitor.AddSoftProcedureQuery();
#endif
if (conn.Settings.Logging)
MySqlTrace.LogInformation(conn.ServerThread,
String.Format(Resources.SoftProcQuery, spName));
}
return ds;
}
internal string GetCacheKey(string spName, DataSet procData)
{
string retValue = String.Empty;
StringBuilder key = new StringBuilder(spName);
key.Append("(");
string delimiter = "";
if (procData.Tables.Contains("Procedure Parameters"))
{
foreach (DataRow row in procData.Tables["Procedure Parameters"].Rows)
{
if (row["ORDINAL_POSITION"].Equals(0))
retValue = "?=";
else
{
key.AppendFormat(CultureInfo.InvariantCulture, "{0}?", delimiter);
delimiter = ",";
}
}
}
key.Append(")");
return retValue + key.ToString();
}
private DataSet AddNew(MySqlConnection connection, string spName)
{
DataSet procData = GetProcData(connection, spName);
if (maxSize > 0)
{
string cacheKey = GetCacheKey(spName, procData);
int hash = cacheKey.GetHashCode();
lock (procHash.SyncRoot)
{
if (procHash.Keys.Count >= maxSize)
TrimHash();
if (!procHash.ContainsKey(hash))
{
procHash[hash] = procData;
hashQueue.Enqueue(hash);
}
}
}
return procData;
}
private void TrimHash()
{
int oldestHash = hashQueue.Dequeue();
procHash.Remove(oldestHash);
}
private static DataSet GetProcData(MySqlConnection connection, string spName)
{
string schema = String.Empty;
string name = spName;
int dotIndex = spName.IndexOf(".");
if (dotIndex != -1)
{
schema = spName.Substring(0, dotIndex);
name = spName.Substring(dotIndex + 1, spName.Length - dotIndex - 1);
}
string[] restrictions = new string[4];
restrictions[1] = schema.Length > 0 ? schema : connection.CurrentDatabase();
restrictions[2] = name;
DataTable procTable = connection.GetSchema("procedures", restrictions);
if (procTable.Rows.Count > 1)
throw new MySqlException(Resources.ProcAndFuncSameName);
if (procTable.Rows.Count == 0)
throw new MySqlException(String.Format(Resources.InvalidProcName, name, schema));
DataSet ds = new DataSet();
ds.Tables.Add(procTable);
// we don't use GetSchema here because that would cause another
// query of procedures and we don't need that since we already
// know the procedure we care about.
ISSchemaProvider isp = new ISSchemaProvider(connection);
string[] rest = isp.CleanRestrictions(restrictions);
DataTable parametersTable = isp.GetProcedureParameters(rest, procTable);
ds.Tables.Add(parametersTable);
return ds;
}
}
}
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