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PriorityExpire.h
//
// PriorityExpire.h
//
// $Id: //poco/1.3/Foundation/include/Poco/PriorityExpire.h#2 $
//
// Library: Foundation
// Package: Events
// Module:  PriorityExpire
//
// Implementation of the PriorityExpire template.
//
// 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  Foundation_PriorityExpire_INCLUDED
#define  Foundation_PriorityExpire_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"
#include "Poco/AbstractPriorityDelegate.h"


namespace Poco {


template <class TArgs>
00052 class PriorityExpire: public AbstractPriorityDelegate<TArgs>
      /// Decorator for AbstractPriorityDelegate adding automatic 
      /// expiring of registrations to AbstractPriorityDelegate.
{
public:
      PriorityExpire(const AbstractPriorityDelegate<TArgs>& p, Timestamp::TimeDiff expireMilliSec):
            AbstractPriorityDelegate<TArgs>(p),
            _pDelegate(p.clone()), 
            _expire(expireMilliSec*1000)
      {
      }
      
      PriorityExpire(const PriorityExpire& expire):
            AbstractPriorityDelegate<TArgs>(expire),
            _pDelegate(expire._pDelegate->clone()),
            _expire(expire._expire),
            _creationTime(expire._creationTime)
      {
      }

      ~PriorityExpire()
      {
            destroy();
      }
      
      PriorityExpire& operator = (const PriorityExpire& expire)
      {
            if (&expire != this)
            {
                  delete this->_pDelegate;
                  this->_pTarget      = expire._pTarget;
                  this->_pDelegate    = expire._pDelegate->clone();
                  this->_expire       = expire._expire;
                  this->_creationTime = expire._creationTime;
            }
            return *this; 
      }

      bool notify(const void* sender, TArgs& arguments)
      {
            if (!expired())
                  return this->_pDelegate->notify(sender, arguments);
            else
                  return false;
      }

00098       AbstractPriorityDelegate<TArgs>* clone() const
      {
            return new PriorityExpire(*this);
      }

      void destroy()
      {
            delete this->_pDelegate;
            this->_pDelegate = 0;
      }

      const AbstractPriorityDelegate<TArgs>& getDelegate() const
      {
            return *this->_pDelegate;
      }

protected:
      bool expired() const
      {
            return _creationTime.isElapsed(_expire);
      }

      AbstractPriorityDelegate<TArgs>* _pDelegate;
      Timestamp::TimeDiff _expire;
      Timestamp _creationTime;

private:
      PriorityExpire();
};


} // namespace Poco


#endif

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