File: event-target.c

package info (click to toggle)
telepathy-rakia 0.8.0-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, jessie, jessie-kfreebsd, sid, stretch
  • size: 3,028 kB
  • ctags: 1,720
  • sloc: sh: 11,552; ansic: 9,892; python: 4,532; makefile: 421; xml: 15
file content (278 lines) | stat: -rw-r--r-- 8,028 bytes parent folder | download
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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * event-target.c - Implementation for RakiaEventTarget interface
 * Copyright (C) 2008 Nokia Corporation
 *   @author Mikhail Zabaluev <mikhail.zabaluev@nokia.com>
 *
 * This work is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This work is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "config.h"

#include "event-target.h"
#include "signals-marshal.h"

#define DEBUG_FLAG RAKIA_DEBUG_EVENTS
#include "debug.h"

/* Define to the highest known nua_event_e enumeration member */
#define RAKIA_NUA_EVENT_LAST nua_i_register

/* Mapping of the event enumeration to signal detail quarks */
static GQuark event_quarks[RAKIA_NUA_EVENT_LAST + 1] = {0};

/* Signals */
enum {
  SIG_NUA_EVENT,
  NUM_SIGNALS
};
static guint signals[NUM_SIGNALS] = {0};

static RakiaEventTarget * rakia_event_target_gone_instance (void);

static void
rakia_event_target_base_init (gpointer klass)
{
  static gboolean initialized = FALSE;
  gint i;

  if (!initialized)
    {
      initialized = TRUE;

      /**
       * RakiaEventTarget::nua-event:
       * @instance: an object implementing #RakiaEventTarget that emitted the signal
       * @event: Pointer to the event data structure
       * @tags: Tag list containing dynamically typed information about the event
       *
       * Emitted by the NUA event handler for an object bound
       * to a NUA operation handle.  
       * Returns: a handler returns TRUE to indicate that further handling
       * of the signal should cease.
       */
      signals[SIG_NUA_EVENT] =
        g_signal_new ("nua-event",
            G_TYPE_FROM_CLASS (klass),
            G_SIGNAL_RUN_LAST|G_SIGNAL_DETAILED,
            0 /* G_STRUCT_OFFSET (RakiaEventTargetInterface, nua_event) */,
            g_signal_accumulator_true_handled,
            NULL,
            _rakia_marshal_BOOLEAN__POINTER_POINTER,
            G_TYPE_BOOLEAN,
            2,
            G_TYPE_POINTER,
            G_TYPE_POINTER);

      for (i = 0; i <= RAKIA_NUA_EVENT_LAST; i++)
        event_quarks[i] =
            g_quark_from_static_string (nua_event_name ((nua_event_t) i));
    }
}

GType
rakia_event_target_get_type (void)
{
  static GType type = 0;

  if (G_UNLIKELY (type == 0))
    {
      static const GTypeInfo info = {
        sizeof (RakiaEventTargetInterface),
        rakia_event_target_base_init, /* base_init */
        NULL, /* base_finalize */
        NULL, /* class_init */
        NULL, /* class_finalize */
        NULL, /* class_data */
        0,
        0, /* n_preallocs */
        NULL /* instance_init */
      };

      type = g_type_register_static (G_TYPE_INTERFACE,
          "RakiaEventTargetInterface", &info, 0);
    }

  return type;
}

static void
rakia_event_target_retire_nua_handle (nua_handle_t *nh)
{
  static RakiaEventTarget *target_gone = NULL;

  if (G_UNLIKELY (target_gone == NULL))
    target_gone = rakia_event_target_gone_instance ();

  nua_handle_bind (nh, target_gone);
  nua_handle_unref (nh);
}

static void
_rakia_event_target_finalized (gpointer data, GObject *former_obj)
{
  rakia_event_target_retire_nua_handle ((nua_handle_t *) data);
}

/**
 * rakia_event_target_attach:
 * @nh: The NUA handle
 * @obj: an object implementing #RakiaEventTarget
 *
 * Attach an event target object to the NUA handle using nua_handle_bind().
 * The reference count of the NUA handle is incremented.
 * When the attached object is finalized, the reference count of the NUA handle
 * is decremented, and the handle is bound to a special end-of-life event
 * handler for debugging purposes.
 */
void
rakia_event_target_attach (nua_handle_t *nh, GObject *obj)
{
  g_assert (nh != NULL);

  nua_handle_bind (nh, RAKIA_EVENT_TARGET (obj));
  nua_handle_ref (nh);

  g_object_weak_ref (obj, _rakia_event_target_finalized, nh);
}

/**
 * rakia_event_target_detach:
 * @nh: The NUA handle
 *
 * Detach the event target object previously attached to the NUA handle
 * using rakia_event_target_attach().
 * The reference count of the NUA handle is decremented, and the handle
 * is bound to a special end-of-life event handler for debugging purposes.
 */
void
rakia_event_target_detach (nua_handle_t *nh)
{
  GObject *obj;

  g_assert (nh != NULL);

  obj = G_OBJECT (nua_handle_magic (nh));
  g_object_weak_unref (obj, _rakia_event_target_finalized, nh);

  rakia_event_target_retire_nua_handle (nh);
}

/**
 * rakia_event_target_emit_nua_event:
 * @instance: The object implementing this interface
 * @event: Pointer to the event data structure
 * @tags: Tag list containing dynamically typed information about the event 
 *
 * Emit the signal #RakiaEventTarget::nua-event, detailed with the event name,
 * on an instance of a class implementing this interface.
 * This function is normally called by the NUA callback.
 * Returns: TRUE if a signal handler handled the event and returned TRUE. 
 */
gboolean
rakia_event_target_emit_nua_event (gpointer             instance,
                                   const RakiaNuaEvent *ev,
                                   tagi_t               tags[])
{
  gboolean retval = FALSE;
  gint nua_event;
  GQuark detail;

  g_assert (RAKIA_IS_EVENT_TARGET (instance));

  nua_event = ev->nua_event;

  detail = G_LIKELY (nua_event >= 0 && nua_event <= RAKIA_NUA_EVENT_LAST)
           ? event_quarks[nua_event]
           : g_quark_from_static_string (nua_event_name (nua_event));

  g_signal_emit (instance,
                 signals[SIG_NUA_EVENT],
                 detail,
                 ev,
                 tags,
                 &retval);

  return retval;
}

/* RakiaEventTargetGone:
 * a special private implementation of RakiaEventTarget for a singleton
 * catch-all object to associate with handles that have been detached from
 * other event targets.
 */
typedef struct _RakiaEventTargetGone RakiaEventTargetGone;
typedef struct _RakiaEventTargetGoneClass RakiaEventTargetGoneClass;

static GType rakia_event_target_gone_get_type (void);

struct _RakiaEventTargetGone {
  GObject parent;
};

struct _RakiaEventTargetGoneClass {
  GObjectClass parent_class;
};

static gboolean
rakia_late_nua_event_cb (RakiaEventTargetGone *self,
                         const RakiaNuaEvent  *event,
                         tagi_t                tags[],
                         gpointer              foo)
{
  DEBUG ("%s received for the retired handle %p: %03d %s",
      nua_event_name (event->nua_event),
      event->nua_handle,
      event->status,
      event->text);
  return TRUE;
}

static void
rakia_event_target_gone_iface_init (gpointer g_iface, gpointer iface_data)
{
}

G_DEFINE_TYPE_WITH_CODE (RakiaEventTargetGone, rakia_event_target_gone,
    G_TYPE_OBJECT,
    G_IMPLEMENT_INTERFACE (RAKIA_TYPE_EVENT_TARGET, rakia_event_target_gone_iface_init))

static void
rakia_event_target_gone_class_init (RakiaEventTargetGoneClass *klass)
{
}

static void
rakia_event_target_gone_init (RakiaEventTargetGone *self)
{
  g_signal_connect (self, "nua-event",
                    G_CALLBACK (rakia_late_nua_event_cb),
                    NULL);
}

static gpointer
_rakia_event_target_gone_new_instance (gpointer foo)
{
  return g_object_new (rakia_event_target_gone_get_type (), NULL);
}

static RakiaEventTarget *
rakia_event_target_gone_instance (void)
{
  static GOnce init_gone_once = G_ONCE_INIT;

  g_once (&init_gone_once, _rakia_event_target_gone_new_instance, NULL);

  return RAKIA_EVENT_TARGET (init_gone_once.retval);
}