struct afb_event_itf {
/* CAUTION: respect the order, add at the end */
int (*broadcast)(void *closure, struct json_object *obj);
int (*push)(void *closure, struct json_object *obj);
void (*drop)(void *closure);
struct afb_event_itf {
/* CAUTION: respect the order, add at the end */
int (*broadcast)(void *closure, struct json_object *obj);
int (*push)(void *closure, struct json_object *obj);
void (*drop)(void *closure);