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/*
* Copyright (C) 2016 "IoT.bzh"
* Author: José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
/* avoid inclusion of <json-c/json.h> */
struct json_object;
/*
* Interface for handling requests.
* It records the functions to be called for the request.
* Don't use this structure directly.
* Use the helper functions documented below.
*/
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);
};
/*
* Describes the request of afb-daemon for bindings
*/
struct afb_event {
const struct afb_event_itf *itf; /* the interface to use */
void *closure; /* the closure argument for functions of 'itf' */
};
/*
* Checks wether the 'event' is valid or not.
*
* Returns 0 if not valid or 1 if valid.
*/
static inline int afb_event_is_valid(struct afb_event event)
{
return event.itf != NULL;
}
/*
* Broadcasts widely the 'event' with the data 'object'.
* 'object' can be NULL.
*
* For convenience, the function calls 'json_object_put' for 'object'.
* Thus, in the case where 'object' should remain available after
* the function returns, the function 'json_object_get' shall be used.
*
* Returns the count of clients that received the event.
*/
static inline int afb_event_broadcast(struct afb_event event, struct json_object *object)
{
return event.itf->broadcast(event.closure, object);
}
/*
* Pushes the 'event' with the data 'object' to its observers.
* 'object' can be NULL.
*
* For convenience, the function calls 'json_object_put' for 'object'.
* Thus, in the case where 'object' should remain available after
* the function returns, the function 'json_object_get' shall be used.
*
* Returns the count of clients that received the event.
*/
static inline int afb_event_push(struct afb_event event, struct json_object *object)
{
return event.itf->push(event.closure, object);
}
/*
* Drops the data associated to the event
* After calling this function, the event
* MUST NOT BE USED ANYMORE.
*/
static inline void afb_event_drop(struct afb_event event)
{
event.itf->drop(event.closure);
}
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