source: src/Patterns/Observer/Notification.hpp@ 3324cf

/*
 * Notification.hpp
 *
 *  Created on: Dec 1, 2011
 *      Author: heber
 */

#ifndef NOTIFICATION_HPP_
#define NOTIFICATION_HPP_

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <set>

class Observable;
class Observer;
class Relay;

/** Notifications are sort of news channels of an Observable.
 * Via the NOTIFY() macro updates can be transmitted in a specific channel.
 * Observers can subscribe to Notification in much the same way as they can to
 * the Observable itself. Usually, Notifications are used along
 * with the usual OBSERVE() macro to generate both the specific and
 * the global message of change.
 */
class Notification {
  //!> grant Observable access to notifyAll()
  friend class Observable;
  //!> grant Relay access to notifyAll()
  friend class Relay;
public:
  Notification(size_t _channelno);
  virtual ~Notification();

  size_t getChannelNo() const { return channelno; }

protected:

  void addObserver(Observer *target);
  void removeObserver(Observer *target);

  void notifyAll(Observable * const publisher);
private:
  std::set<Observer*> targets;
  const size_t channelno;
};



#endif /* NOTIFICATION_HPP_ */