summaryrefslogtreecommitdiffstats
path: root/include/afb/afb-event.h
blob: 0876d8cfa233f3ef8c07764bf54acc1aceb6f626 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
/*
 * Copyright (C) 2016, 2017, 2018 "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

#include "afb-eventid-itf.h"

/*
 * Describes the request of afb-daemon for bindings
 */
struct afb_event
{
	const struct afb_eventid_itf *itf;	/* the interface to use */
	struct afb_eventid *closure;		/* the closure argument for functions of 'itf' */
};

/*
 * Converts the 'event' to an afb_eventid.
 */
static inline struct afb_eventid *afb_event_to_eventid(struct afb_event event)
{
	return event.closure;
}

/*
 * 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;
}

/*
 * 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);
}

/* OBSOLETE */
#define afb_event_drop afb_event_unref

/*
 * Gets the name associated to the 'event'.
 */
static inline const char *afb_event_name(struct afb_event event)
{
	return event.itf->name(event.closure);
}

/*
 * Decreases the count of reference to 'event' and
 * destroys the event when the reference count falls to zero.
 */
static inline void afb_event_unref(struct afb_event event)
{
	event.itf->unref(event.closure);
}

/*
 * Increases the count of reference to 'event'
 */
static inline void afb_event_addref(struct afb_event event)
{
	event.itf->addref(event.closure);
}