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DefaultStrategy.h

//
// DefaultStrategy.h
//
// $Id: //poco/1.2/Foundation/include/Poco/DefaultStrategy.h#1 $
//
// Library: Foundation
// Package: Events
// Module:  DefaultStrategy
//
// Implementation of the DefaultStrategy 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_DefaultStrategy_INCLUDED
#define  Foundation_DefaultStrategy_INCLUDED


#include "Poco/NotificationStrategy.h"
#include <memory>
#include <set>
#include <vector>


namespace Poco {


template <class TArgs, class TDelegate, class TCompare> 
00053 class DefaultStrategy: public NotificationStrategy<TArgs, TDelegate>
      /// Default notification strategy. Allows one observer
      ///   to register exactly once. The observer must provide an
      /// < (less-than) operator.
{
public:
      typedef std::set<TDelegate*, TCompare>     Delegates;
      typedef typename Delegates::iterator       Iterator;
      typedef typename Delegates::const_iterator ConstIterator;

public:
      DefaultStrategy()
      {
      }

      DefaultStrategy(const DefaultStrategy& s)
      {
            operator = (s);
      }

      ~DefaultStrategy()
      {
            clear();
      }

      void notify(const void* sender, TArgs& arguments)
      {
            std::vector<Iterator> delMe;

            for (Iterator it = _observers.begin(); it != _observers.end(); it++)
            {
                  if (!(*it)->notify(sender, arguments))
                  {
                        // schedule for deletion
                        delMe.push_back(it);
                  }
            }
            
            while (!delMe.empty())
            {
                  typename std::vector<Iterator>::iterator vit = delMe.end();
                  --vit;
                  delete **vit;
                  _observers.erase(*vit);
                  delMe.pop_back();
            }
      }

00101       void add(const TDelegate& delegate)
      {
            Iterator it = _observers.find(const_cast<TDelegate*>(&delegate));
            if (it != _observers.end())
            {
                  delete *it;
                  _observers.erase(it);
            }
            std::auto_ptr<TDelegate> pDelegate(delegate.clone());
            bool tmp = _observers.insert(pDelegate.get()).second;
            poco_assert (tmp);
            pDelegate.release();
      }

00115       void remove(const TDelegate& delegate)
      {
            Iterator it = _observers.find(const_cast<TDelegate*>(&delegate));
            if (it != _observers.end())
            {
                  delete *it;
                  _observers.erase(it);
            }
      }

      DefaultStrategy& operator = (const DefaultStrategy& s)
      {
            if (this != &s)
            {
                  for (ConstIterator it = s._observers.begin(); it != s._observers.end(); ++it)
                  {
                        add(**it);
                  }
            }
            return *this;
      }

00137       void clear()
      {
            for (Iterator it = _observers.begin(); it != _observers.end(); ++it)
            {
                  delete *it;
            }
            _observers.clear();
      }

protected:
      Delegates _observers;
};


} // namespace Poco


#endif

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