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Complete the name owning section of the migration guide

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This commit is contained in:
Matthias Clasen 2010-05-11 21:30:53 -04:00
parent e4b1e48fca
commit 9b05e0bc3e
1 changed files with 77 additions and 61 deletions
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138
docs/reference/gio/migrating-gdbus.xml
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@ -74,75 +74,91 @@
Using dbus-glib, you typically call RequestName manually
to own a name, like in the following excerpt:
<informalexample><programlisting><![CDATA[
static gboolean
acquire_name_on_proxy (DBusGProxy *system_bus_proxy,
gboolean replace)
{
GError *error;
guint result;
gboolean res;
gboolean ret;
guint flags;
ret = FALSE;
flags = DBUS_NAME_FLAG_ALLOW_REPLACEMENT;
if (replace)
flags |= DBUS_NAME_FLAG_REPLACE_EXISTING;
error = NULL;
res = dbus_g_proxy_call (system_bus_proxy,
"RequestName",
&error,
G_TYPE_STRING,
NAME_TO_CLAIM,
G_TYPE_UINT,
flags,
G_TYPE_INVALID,
G_TYPE_UINT,
&result,
G_TYPE_INVALID);
if (!res) {
if (error != NULL) {
g_warning ("Failed to acquire %s: %s",
NAME_TO_CLAIM, error->message);
g_error_free (error);
}
else {
g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
}
goto out;
error = NULL;
res = dbus_g_proxy_call (system_bus_proxy,
"RequestName",
&error,
G_TYPE_STRING, NAME_TO_CLAIM,
G_TYPE_UINT, DBUS_NAME_FLAG_ALLOW_REPLACEMENT,
G_TYPE_INVALID,
G_TYPE_UINT, &result,
G_TYPE_INVALID);
if (!res)
{
if (error != NULL)
{
g_warning ("Failed to acquire %s: %s",
NAME_TO_CLAIM, error->message);
g_error_free (error);
}
if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
if (error != NULL) {
g_warning ("Failed to acquire %s: %s",
NAME_TO_CLAIM, error->message);
g_error_free (error);
}
else {
g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
}
goto out;
else
{
g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
}
goto out;
}
dbus_g_proxy_add_signal (system_bus_proxy, "NameLost",
G_TYPE_STRING, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (system_bus_proxy, "NameLost",
G_CALLBACK (name_lost), NULL, NULL);
ret = TRUE;
out:
return ret;
}
if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
{
if (error != NULL)
{
g_warning ("Failed to acquire %s: %s",
NAME_TO_CLAIM, error->message);
g_error_free (error);
}
else
{
g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
}
exit (1);
}
dbus_g_proxy_add_signal (system_bus_proxy, "NameLost",
G_TYPE_STRING, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (system_bus_proxy, "NameLost",
G_CALLBACK (on_name_lost), NULL, NULL);
/* further setup ... */
]]>
</programlisting></informalexample>
</para>
<para>
While you can do things this way with GDBus too, it is much nicer
to use the high-level API for this:
<informalexample><programlisting>
...insert example here...
While you can do things this way with GDBus too, using
g_dbus_proxy_call_sync(), it is much nicer to use the high-level API
for this:
<informalexample><programlisting><![CDATA[
static void
on_name_acquired (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
/* further setup ... */
}
/* ... */
owner_id = g_bus_own_name (G_BUS_TYPE_SYSTEM,
NAME_TO_CLAIM,
G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT,
on_bus_acquired,
on_name_acquired,
on_name_lost,
NULL,
NULL);
g_main_loop_run (loop);
g_bus_unown_name (owner_id);
]]>
</programlisting></informalexample>
Note that g_bus_own_name() works asynchronously and requires
you to enter your mainloop to await the on_name_aquired()
callback. Also note that in order to avoid race conditions (e.g.
when your service is activated by a method call), you have to export
your manager object <emphasis>before</emphasis> acquiring the
name. The on_bus_acquired() callback is the right place to do
such preparations.
</para>
</section>
<section>