observable.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2012 Vincent Lachenal

  This file is part of ANCH Framework.

  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  ANCH Framework is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ANCH_EVENTS_OBSERVABLE_H_
#define _ANCH_EVENTS_OBSERVABLE_H_

#include <mutex>
#include <set>

#include "events/observer.hpp"
#include "lessPtrCompare.hpp"


namespace anch {
  namespace events {

    template<typename Event>
    class Observable {

    private:
      // Attributes +
      std::set<anch::events::Observer<Event>*, anch::LessPtrCompare<Observer<Event> > > _observers;

      std::mutex _mutex;
      // Attributes -

    public:
      // Constructors +
      Observable(): _observers(), _mutex() {
        // Nothing to do
      }
      // Constructors -

      // Destructor +
      virtual ~Observable() {
        // Nothing to do
      }
      // Destructor -

    public:
      // Methods +
      bool addObserver(anch::events::Observer<Event>& observer) {
        _mutex.lock();
        bool added = _observers.insert(&observer).second;
        _mutex.unlock();
        return added;
      }

      void removeObserver(anch::events::Observer<Event>& observer) {
        _mutex.lock();
        _observers.erase(&observer);
        _mutex.unlock();
      }

      void notifyObservers(const Event& event) {
        _mutex.lock();
        for(anch::events::Observer<Event>* observer : _observers) {
          observer->notify(event);
        }
        _mutex.unlock();
      }
      // Methods -

    };

  }
}

#endif // _ANCH_EVENTS_OBSERVABLE_H_