2 * Copyright (C) 2016 "IoT.bzh"
3 * Author: José Bollo <jose.bollo@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
20 /* avoid inclusion of <json-c/json.h> */
24 * Interface for handling requests.
25 * It records the functions to be called for the request.
26 * Don't use this structure directly.
27 * Use the helper functions documented below.
29 struct afb_event_itf {
30 /* CAUTION: respect the order, add at the end */
32 int (*broadcast)(void *closure, struct json_object *obj);
33 int (*push)(void *closure, struct json_object *obj);
34 void (*drop)(void *closure);
38 * Describes the request of afb-daemon for bindings
41 const struct afb_event_itf *itf; /* the interface to use */
42 void *closure; /* the closure argument for functions of 'itf' */
46 * Checks wether the 'event' is valid or not.
48 * Returns 0 if not valid or 1 if valid.
50 static inline int afb_event_is_valid(struct afb_event event)
52 return event.itf != NULL;
56 * Broadcasts widely the 'event' with the data 'object'.
57 * 'object' can be NULL.
59 * For convenience, the function calls 'json_object_put' for 'object'.
60 * Thus, in the case where 'object' should remain available after
61 * the function returns, the function 'json_object_get' shall be used.
63 * Returns the count of clients that received the event.
65 static inline int afb_event_broadcast(struct afb_event event, struct json_object *object)
67 return event.itf->broadcast(event.closure, object);
71 * Pushes the 'event' with the data 'object' to its observers.
72 * 'object' can be NULL.
74 * For convenience, the function calls 'json_object_put' for 'object'.
75 * Thus, in the case where 'object' should remain available after
76 * the function returns, the function 'json_object_get' shall be used.
78 * Returns the count of clients that received the event.
80 static inline int afb_event_push(struct afb_event event, struct json_object *object)
82 return event.itf->push(event.closure, object);
86 * Drops the data associated to the event
87 * After calling this function, the event
88 * MUST NOT BE USED ANYMORE.
90 static inline void afb_event_drop(struct afb_event event)
92 event.itf->drop(event.closure);