DatabaseConnectionPool.h
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00001 /* -*- C++ -*- */
00002 
00003 /****************************************************************************
00004 ** Copyright (c) 2001-2014
00005 **
00006 ** This file is part of the QuickFIX FIX Engine
00007 **
00008 ** This file may be distributed under the terms of the quickfixengine.org
00009 ** license as defined by quickfixengine.org and appearing in the file
00010 ** LICENSE included in the packaging of this file.
00011 **
00012 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
00013 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
00014 **
00015 ** See http://www.quickfixengine.org/LICENSE for licensing information.
00016 **
00017 ** Contact ask@quickfixengine.org if any conditions of this licensing are
00018 ** not clear to you.
00019 **
00020 ****************************************************************************/
00021 
00022 #ifndef FIX_DATABASECONNECTIONPOOL_H
00023 #define FIX_DATABASECONNECTIONPOOL_H
00024 
00025 #ifdef _MSC_VER
00026 #pragma warning( disable : 4503 4355 4786 4290 )
00027 #endif
00028 
00029 #include "DatabaseConnectionID.h"
00030 #include <string>
00031 #include <map>
00032 
00033 namespace FIX
00034 {
00035 template< typename T > class DatabaseConnectionPool
00036 {
00037 public:
00038   DatabaseConnectionPool( bool poolConnections )
00039   : m_poolConnections( poolConnections ) {}
00040 
00041   T* create( const DatabaseConnectionID& id )
00042   {
00043     if( !m_poolConnections )
00044       return new T( id );
00045 
00046     if( m_connections.find( id ) == m_connections.end() )
00047     {
00048       m_connections[id] = Connection
00049         ( new T(id), 0 );
00050     }
00051     m_connections[id].second++;
00052     return m_connections[id].first;
00053   }
00054 
00055   bool destroy( T* pConnection )
00056   {
00057     if( !m_poolConnections )
00058     {
00059       delete pConnection;
00060       return true;
00061     }
00062 
00063     const DatabaseConnectionID& id = pConnection->connectionID();
00064     if( m_connections.find( id ) == m_connections.end() )
00065       return false;
00066 
00067     Connection& connection = m_connections[id];
00068     if( connection.first != pConnection )
00069       return false;
00070 
00071     connection.second--;
00072     if( connection.second == 0 )
00073     {
00074       m_connections.erase( id );
00075       delete pConnection;
00076     }
00077     return true;
00078   }
00079 
00080 private:
00081   typedef std::pair<T*, int>
00082     Connection;
00083   typedef std::map<DatabaseConnectionID, Connection>
00084     Connections;
00085 
00086   Connections m_connections;
00087   bool m_poolConnections;
00088 };
00089 }
00090 
00091 #endif

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