lib/dbus_signal_callback.cpp

   1 /**
   2  * @file dbus_signal_callback.cpp
   3  *
   4  * @brief D-Bus signal callback.
   5  *
   6  * @author Ossama Othman @<ossama.othman@@intel.com@>
   7  *
   8  * @copyright @par
   9  * Copyright 2013 Intel Corporation All Rights Reserved.
  10  * @par
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation;
  14  * version 2.1 of the License.
  15  * @par
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  * @par
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24  * Boston, MA  02110-1301  USA
  25  */
  26
  27 #include <settingsd/dbus_signal_callback.hpp>
  28 #include <settingsd/event_callback.hpp>
  29
  30 #include <json-glib/json-glib.h>
  31
  32
  33 void
  34 ivi::settings::on_dbus_signal(GDBusConnection * /* connection */,
  35                               char const * /* sender_name */,
  36                               char const * object_path,
  37                               char const * interface_name,
  38                               char const * signal_name,
  39                               GVariant   * parameters,
  40                               gpointer     user_data)
  41 {
  42   event_callback * const e = static_cast<event_callback *>(user_data);
  43
  44   // Send event to clients.
  45   e->send_event(
  46     [object_path,
  47      interface_name,
  48      signal_name,
  49      parameters](JsonBuilder * builder)
  50     {
  51       json_builder_set_member_name(builder, "value");
  52
  53       // The event value will be JSON object embedded within the main
  54       // event JSON object.
  55       json_builder_begin_object(builder);
  56
  57       json_builder_set_member_name(builder, "object_path");
  58       json_builder_add_string_value(builder, object_path);
  59
  60       json_builder_set_member_name(builder, "interface_name");
  61       json_builder_add_string_value(builder, interface_name);
  62
  63       json_builder_set_member_name(builder, "signal_name");
  64       json_builder_add_string_value(builder, signal_name);
  65
  66       /**
  67        * @todo Can @c json_gvariant_serialize() ever return a
  68        *       @c nullptr?
  69        */
  70       JsonNode * const services = json_gvariant_serialize(parameters);
  71
  72       json_builder_set_member_name(builder, "parameters");
  73       json_builder_add_value(builder, services);
  74
  75       // No need to free the JsonNode.  The builder will take
  76       // ownership of it.
  77
  78       json_builder_end_object(builder);
  79     });
  80 }
  81
  82
  83 // Local Variables:
  84 // mode:c++
  85 // c-basic-offset:2
  86 // indent-tabs-mode: nil
  87 // End: