2 * Copyright (C) 2016, 2017 "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);
35 const char *(*name)(void *closure);
39 * Describes the request of afb-daemon for bindings
42 const struct afb_event_itf *itf; /* the interface to use */
43 void *closure; /* the closure argument for functions of 'itf' */
47 * Checks wether the 'event' is valid or not.
49 * Returns 0 if not valid or 1 if valid.
51 static inline int afb_event_is_valid(struct afb_event event)
53 return event.itf != NULL;
57 * Broadcasts widely the 'event' with the data 'object'.
58 * 'object' can be NULL.
60 * For convenience, the function calls 'json_object_put' for 'object'.
61 * Thus, in the case where 'object' should remain available after
62 * the function returns, the function 'json_object_get' shall be used.
64 * Returns the count of clients that received the event.
66 static inline int afb_event_broadcast(struct afb_event event, struct json_object *object)
68 return event.itf->broadcast(event.closure, object);
72 * Pushes the 'event' with the data 'object' to its observers.
73 * 'object' can be NULL.
75 * For convenience, the function calls 'json_object_put' for 'object'.
76 * Thus, in the case where 'object' should remain available after
77 * the function returns, the function 'json_object_get' shall be used.
79 * Returns the count of clients that received the event.
81 static inline int afb_event_push(struct afb_event event, struct json_object *object)
83 return event.itf->push(event.closure, object);
87 * Drops the data associated to the 'event'
88 * After calling this function, the event
89 * MUST NOT BE USED ANYMORE.
91 static inline void afb_event_drop(struct afb_event event)
93 event.itf->drop(event.closure);
97 * Gets the name associated to the 'event'.
99 static inline const char *afb_event_name(struct afb_event event)
101 return event.itf->name(event.closure);