nes-proj/core/net/rime/announcement.c

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/*
* 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.
*
*/
/**
* \file
* Implementation of the announcement primitive
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rimeannouncement
* @{
*/
#include "net/rime/announcement.h"
#include "lib/list.h"
#include "sys/cc.h"
LIST(announcements);
static void (* listen_callback)(int time);
static announcement_observer observer_callback;
/*---------------------------------------------------------------------------*/
void
announcement_init(void)
{
list_init(announcements);
}
/*---------------------------------------------------------------------------*/
void
announcement_register(struct announcement *a, uint16_t id,
announcement_callback_t callback)
{
a->id = id;
a->has_value = 0;
a->callback = callback;
list_add(announcements, a);
if(observer_callback) {
observer_callback(a->id, a->has_value,
a->value, 0, ANNOUNCEMENT_BUMP);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_remove(struct announcement *a)
{
list_remove(announcements, a);
}
/*---------------------------------------------------------------------------*/
void
announcement_remove_value(struct announcement *a)
{
a->has_value = 0;
if(observer_callback) {
observer_callback(a->id, 0, 0, 0, ANNOUNCEMENT_NOBUMP);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_set_value(struct announcement *a, uint16_t value)
{
uint16_t oldvalue = a->value;
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a->has_value = 1;
a->value = value;
if(observer_callback) {
observer_callback(a->id, a->has_value,
value, oldvalue, ANNOUNCEMENT_NOBUMP);
}
}
/*---------------------------------------------------------------------------*/
void
announcement_bump(struct announcement *a)
{
if(observer_callback) {
observer_callback(a->id, a->has_value,
a->value, a->value, ANNOUNCEMENT_BUMP);
}
}
/*---------------------------------------------------------------------------*/
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(announcement_observer callback)
{
observer_callback = callback;
}
/*---------------------------------------------------------------------------*/
struct announcement *
announcement_list(void)
{
return list_head(announcements);
}
/*---------------------------------------------------------------------------*/
void
announcement_heard(const linkaddr_t *from, uint16_t id, uint16_t value)
{
struct announcement *a;
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for(a = list_head(announcements); a != NULL; a = list_item_next(a)) {
if(a->id == id) {
if(a->callback != NULL) {
a->callback(a, from, id, value);
}
return;
}
}
}
/*---------------------------------------------------------------------------*/
/** @} */