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.
31 /* CAUTION: respect the order, add at the end */
33 int (*broadcast)(void *closure, struct json_object *obj);
34 int (*push)(void *closure, struct json_object *obj);
35 void (*unref)(void *closure);
36 const char *(*name)(void *closure);
37 void (*addref)(void *closure);
41 * Describes the request of afb-daemon for bindings
45 const struct afb_event_itf *itf; /* the interface to use */
46 void *closure; /* the closure argument for functions of 'itf' */
50 * Checks wether the 'event' is valid or not.
52 * Returns 0 if not valid or 1 if valid.
54 static inline int afb_event_is_valid(struct afb_event event)
60 * Broadcasts widely the 'event' with the data 'object'.
61 * 'object' can be NULL.
63 * For convenience, the function calls 'json_object_put' for 'object'.
64 * Thus, in the case where 'object' should remain available after
65 * the function returns, the function 'json_object_get' shall be used.
67 * Returns the count of clients that received the event.
69 static inline int afb_event_broadcast(struct afb_event event, struct json_object *object)
71 return event.itf->broadcast(event.closure, object);
75 * Pushes the 'event' with the data 'object' to its observers.
76 * 'object' can be NULL.
78 * For convenience, the function calls 'json_object_put' for 'object'.
79 * Thus, in the case where 'object' should remain available after
80 * the function returns, the function 'json_object_get' shall be used.
82 * Returns the count of clients that received the event.
84 static inline int afb_event_push(struct afb_event event, struct json_object *object)
86 return event.itf->push(event.closure, object);
90 #define afb_event_drop afb_event_unref
93 * Gets the name associated to the 'event'.
95 static inline const char *afb_event_name(struct afb_event event)
97 return event.itf->name(event.closure);
101 * Decrease the count of reference to 'event' and
102 * destroys the event when the reference count falls to zero.
104 static inline void afb_event_unref(struct afb_event event)
106 event.itf->unref(event.closure);
110 * remove one reference to the data associated to the 'event'
111 * After calling this function, the event
112 * MUST NOT BE USED ANYMORE.
114 static inline void afb_event_addref(struct afb_event event)
116 event.itf->addref(event.closure);