96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
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/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2006 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief Simple notifier for the subject/observer pattern (interface)
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*
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* \author Bernie Innocenti <bernie@codewiz.org>
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*/
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#ifndef MWARE_OBSERVER_H
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#define MWARE_OBSERVER_H
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#include <struct/list.h>
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/**
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*
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* Here's a simple example:
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*
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* \code
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* Subject kbd_driver;
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*
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* Observer kbd_observer;
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*
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* void key_pressed(int event, void *_param)
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* {
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* char *param = (char *)_param;
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*
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* if (event == EVENT_KBD_PRESSED)
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* printf("You pressed %c\n", *param);
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* }
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*
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* void register_kbd_listener(void)
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* {
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* observer_SetEvent(&kbd_observer, key_pressed);
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* observer_Subscribe(&kbd_driver, &kbd_observer);
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* }
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* \endcode
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*/
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typedef struct Observer
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{
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Node link;
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void (*event)(int event_id, void *param);
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} Observer;
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typedef struct Subject
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{
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/// Subscribed observers.
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List observers;
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} Subject;
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void observer_SetEvent(Observer *observer, void (*event)(int event_id, void *param));
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#define OBSERVER_INITIALIZER(callback) { { NULL, NULL }, callback }
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void observer_InitSubject(Subject *subject);
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/// Aggiunge un Observer all'insieme
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void observer_Subscribe(Subject *subject, Observer *observer);
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/// Rimuove un Observer dall'insieme
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void observer_Unsubscribe(Subject *subject, Observer *observer);
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/// per tutti gli elementi nel set notifica l'evento, chiamando la relativa
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/// funzione event
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void observer_notify(Subject *subject, int event_id, void *param);
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#endif /* MWARE_OBSERVER_H */
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