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