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//
// System.Data.OleDb.OleDbConnectionFactory
//
// Authors:
// Konstantin Triger <kostat@mainsoft.com>
// Boris Kirzner <borisk@mainsoft.com>
//
// (C) 2005 Mainsoft Corporation (http://www.mainsoft.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Data;
using System.Data.Common;
using System.Reflection;
using System.Collections;
namespace System.Data.OleDb
{
internal class OleDbConnectionFactory
{
private static Object LockObj = new Object();
private static Hashtable dataSourceCache = new Hashtable();
private static Type OracleConnectionCacheImplType = Type.GetType("oracle.jdbc.pool.OracleConnectionCacheImpl");
private static MethodInfo setUrlMethod = OracleConnectionCacheImplType.GetMethod("setURL", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo setUserMethod = OracleConnectionCacheImplType.GetMethod("setUser", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo setPasswordMethod = OracleConnectionCacheImplType.GetMethod("setPassword", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo getActiveSizeMethod = OracleConnectionCacheImplType.GetMethod("getActiveSize", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo closeMethod = OracleConnectionCacheImplType.GetMethod("close", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo setMaxLimitMethod = OracleConnectionCacheImplType.GetMethod("setMaxLimit", BindingFlags.Public | BindingFlags.Instance);
private static MethodInfo setMinLimitMethod = OracleConnectionCacheImplType.GetMethod("setMinLimit", BindingFlags.Public | BindingFlags.Instance);
private static long timestamp = DateTime.Now.Ticks;
private static int MINUTES_TIMEOUT = 60;
private static DbStringManager StringManager = new DbStringManager("System.Data.System.Data.ProviderBase.jvm.OleDbStrings");
internal static java.sql.Connection GetConnection(OleDbConnection.PROVIDER_TYPE providerType,String url,String user,String password,int timeout)
{
CacheKey key = new CacheKey(url,user,password);
Object dataSourceObj;
lock(LockObj)
{
if (TimeIsOver())
Clear();
dataSourceObj = dataSourceCache[key];
if (dataSourceObj == null)
{
switch(providerType)
{
case OleDbConnection.PROVIDER_TYPE.MSDAORA :
dataSourceObj = Activator.CreateInstance(OracleConnectionCacheImplType);
Object[] setUrlArgs = new Object[1] { url };
Object[] setUserArgs = new Object[1] { user };
Object[] setPasswordArgs = new Object[1] { password };
setUrlMethod.Invoke(dataSourceObj,setUrlArgs);
setUserMethod.Invoke(dataSourceObj,setUserArgs);
setPasswordMethod.Invoke(dataSourceObj,setPasswordArgs);
int maxLimit = Convert.ToInt32(StringManager.GetString("ORA_CONNECTION_POOLING_MAX_LIMIT","-1"));
int minLimit = Convert.ToInt32(StringManager.GetString("ORA_CONNECTION_POOLING_MIN_LIMIT","-1"));
if(minLimit != -1)
setMinLimitMethod.Invoke(dataSourceObj,new Object[1] { minLimit } );
if(maxLimit != -1)
setMaxLimitMethod.Invoke(dataSourceObj,new Object[1] { maxLimit } );
break;
}
dataSourceCache.Add(key,dataSourceObj);
}
}
java.sql.Connection conn;
lock(dataSourceObj) {
if (((javax.sql.DataSource)dataSourceObj).getLoginTimeout() != timeout) {
((javax.sql.DataSource)dataSourceObj).setLoginTimeout(timeout);
}
conn = ((javax.sql.DataSource)dataSourceObj).getConnection();
}
return conn;
}
private static bool TimeIsOver()
{
return (DateTime.Now.Ticks - timestamp > MINUTES_TIMEOUT * TimeSpan.TicksPerMinute);
}
private static void Clear()
{
ArrayList closedDataSources = new ArrayList();
// collect all the datasources with no connections in use
foreach(DictionaryEntry e in dataSourceCache)
{
Object dataSourceObj = e.Value;
Object dataSourceObjKey = e.Key;
if (getActiveSizeMethod.Invoke(dataSourceObj,new object[0]).Equals(0)) {
closeMethod.Invoke(dataSourceObj,new object[0]);
closedDataSources.Add(dataSourceObjKey);
}
}
// close and remove all data sources with no connections in use
foreach(Object dataSourceObjKey in closedDataSources) {
dataSourceCache.Remove(dataSourceObjKey);
}
}
}
// Key for data sources cache
// data sources mapped by jdbc url, user and password
internal class CacheKey
{
private String url;
private String user;
private String password;
public CacheKey(String url, String user, String password)
{
this.url = url;
this.user = user;
this.password = password;
}
public bool equals(Object o)
{
if (this == o) return true;
if (!(o is CacheKey)) return false;
CacheKey cacheKey = (CacheKey) o;
if (!password.Equals(cacheKey.password)) return false;
if (!url.Equals(cacheKey.url)) return false;
if (!user.Equals(cacheKey.user)) return false;
return true;
}
public int hashCode()
{
int result;
result = url.GetHashCode();
result = 29 * result + user.GetHashCode();
result = 29 * result + password.GetHashCode();
return result;
}
}
}
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