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29 * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
33 * \brief Simple notifier for the subject/observer pattern (interface)
35 * \author Bernie Innocenti <bernie@codewiz.org>
37 #ifndef MWARE_OBSERVER_H
38 #define MWARE_OBSERVER_H
40 #include <struct/list.h>
44 * Here's a simple example:
49 * Observer kbd_observer;
51 * void key_pressed(int event, void *_param)
53 * char *param = (char *)_param;
55 * if (event == EVENT_KBD_PRESSED)
56 * printf("You pressed %c\n", *param);
59 * void register_kbd_listener(void)
61 * observer_SetEvent(&kbd_observer, key_pressed);
62 * observer_Subscribe(&kbd_driver, &kbd_observer);
66 typedef struct Observer
69 void (*event)(int event_id, void *param);
72 typedef struct Subject
74 /// Subscribed observers.
79 void observer_SetEvent(Observer *observer, void (*event)(int event_id, void *param));
81 #define OBSERVER_INITIALIZER(callback) { { NULL, NULL }, callback }
83 void observer_InitSubject(Subject *subject);
85 /// Aggiunge un Observer all'insieme
86 void observer_Subscribe(Subject *subject, Observer *observer);
88 /// Rimuove un Observer dall'insieme
89 void observer_Unsubscribe(Subject *subject, Observer *observer);
91 /// per tutti gli elementi nel set notifica l'evento, chiamando la relativa
93 void observer_notify(Subject *subject, int event_id, void *param);
95 #endif /* MWARE_OBSERVER_H */