text: //
  // PooledSessionHolder.h
  //
  // $Id: //poco/1.3/Data/include/Poco/Data/PooledSessionHolder.h#1 $
  //
  // Library: Data
  // Package: SessionPooling
  // Module:  PooledSessionHolder
  //
  // Definition of the PooledSessionHolder class.
  //
  // Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  
  #ifndef Data_PooledSessionHolder_INCLUDED
  #define Data_PooledSessionHolder_INCLUDED
  
  
  #include "Poco/Data/Data.h"
  #include "Poco/Data/SessionImpl.h"
  #include "Poco/AutoPtr.h"
  #include "Poco/Timestamp.h"
  #include "Poco/Mutex.h"
  
  
  namespace Poco {
  namespace Data {
  
  
  class SessionPool;
  
  
  class Data_API PooledSessionHolder: public Poco::RefCountedObject
  	/// This class is used by SessionPool to manage SessionImpl objects.
  {
  public:
  	PooledSessionHolder(SessionPool& owner, SessionImpl* pSessionImpl);
  		/// Creates the PooledSessionHolder.
  
  	~PooledSessionHolder();
  		/// Destroys the PooledSessionHolder.
  
  	SessionImpl* session();
  		/// Returns a pointer to the SessionImpl.
  
  	SessionPool& owner();
  		/// Returns a reference to the SessionHolder's owner.
  
  	void access();
  		/// Updates the last access timestamp.
  
  	int idle() const;
  		/// Returns the number of seconds the session has not been used.
  				
  private:
  	SessionPool& _owner;
  	Poco::AutoPtr<SessionImpl> _pImpl;
  	Poco::Timestamp _lastUsed;
  	mutable Poco::FastMutex _mutex;
  };
  
  
  //
  // inlines
  //
  inline SessionImpl* PooledSessionHolder::session()
  {
  	return _pImpl;
  }
  
  
  inline SessionPool& PooledSessionHolder::owner()
  {
  	return _owner;
  }
  
  
  inline void PooledSessionHolder::access()
  {
  	Poco::FastMutex::ScopedLock lock(_mutex);
  	
  	_lastUsed.update();
  }
  
  
  inline int PooledSessionHolder::idle() const
  {
  	Poco::FastMutex::ScopedLock lock(_mutex);
  
  	return (int) (_lastUsed.elapsed()/Poco::Timestamp::resolution());
  }
  
  
  } } // namespace Poco::Data
  
  
  #endif // Data_PooledSessionHolder_INCLUDED
  