contiki/core/net/rime/announcement.c
adamdunkels be846d8c90 A new experimental network primitive called an 'announcement'. An
announcement is an (ID, value) tuple that is disseminated to local
area neighbors. An application or protocol can explicitly listen to
announcements from neighbors. When an announcement is heard, a
callback is invoked.

Announcements can be used for a variety of network mechanisms such as
neighbor discovery, node-level service discovery, or routing metric
dissemination.

Application programs and protocols register announcements with the
announcement module. An announcement back-end, implemented by the
system, takes care of sending out announcements over the radio, as
well as collecting announcements heard from neighbors.
2009-02-05 19:32:01 +00:00

140 lines
4.3 KiB
C

/**
* \addtogroup rimeannouncement
* @{
*/
/*
* Copyright (c) 2008, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: announcement.c,v 1.1 2009/02/05 19:32:01 adamdunkels Exp $
*/
/**
* \file
* Implementation of the announcement primitive
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/announcement.h"
#include "lib/list.h"
#include "sys/cc.h"
LIST(announcements);
static void (* listen_callback)(int time);
static void (* observer_callback)(uint16_t id, uint16_t val);
/*---------------------------------------------------------------------------*/
void
announcement_init(void)
{
list_init(announcements);
}
/*---------------------------------------------------------------------------*/
void
announcement_register(struct announcement *a, uint16_t id, uint16_t value,
announcement_callback_t callback)
{
a->id = id;
a->value = value;
a->callback = callback;
list_add(announcements, a);
if(observer_callback) {
observer_callback(a->id, a->value);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_remove(struct announcement *a)
{
list_remove(announcements, a);
}
/*---------------------------------------------------------------------------*/
void
announcement_set_value(struct announcement *a, uint16_t value)
{
a->value = value;
if(observer_callback) {
observer_callback(a->id, a->value);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_set_id(struct announcement *a, uint16_t id)
{
a->id = id;
if(observer_callback) {
observer_callback(a->id, a->value);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_listen(int time)
{
if(listen_callback) {
listen_callback(time);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_register_listen_callback(void (*callback)(int time))
{
listen_callback = callback;
}
/*---------------------------------------------------------------------------*/
void
announcement_register_observer_callback(void (*callback)(uint16_t id, uint16_t value))
{
observer_callback = callback;
}
/*---------------------------------------------------------------------------*/
struct announcement *
announcement_list(void)
{
return list_head(announcements);
}
/*---------------------------------------------------------------------------*/
void
announcement_heard(rimeaddr_t *from, uint16_t id, uint16_t value)
{
struct announcement *a;
for(a = list_head(announcements); a != NULL; a = a->next) {
if(a->id == id) {
if(a->callback != NULL) {
a->callback(a, from, id, value);
}
return;
}
}
}
/*---------------------------------------------------------------------------*/
/** @} */